using System;
using System.Collections.Generic;
using UnityEditor.Networking.PlayerConnection;
using UnityEditor.Rendering.Analytics;
using UnityEditor.Toolbars;
using UnityEditor.UIElements;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.RenderGraphModule;
using UnityEngine.Scripting.APIUpdating;
using UnityEngine.UIElements;

namespace UnityEditor.Rendering
{
    /// <summary>
    /// Editor window class for the Render Graph Viewer
    /// </summary>
    [MovedFrom("")]
    [CoreRPHelpURL(packageName: "com.unity.render-pipelines.universal", pageName: "render-graph-view")]
    public partial class RenderGraphViewer : EditorWindowWithHelpButton
    {
        internal static partial class Names
        {
            public const string kAutoPauseToggle = "auto-pause-toggle";
            public const string kCurrentGraphDropdown = "current-graph-dropdown";
            public const string kConnectionDropdown = "connection-dropdown";
            public const string kCurrentExecutionToolbarMenu = "current-execution-toolbar-menu";
            public const string kPassFilterField = "pass-filter-field";
            public const string kResourceFilterField = "resource-filter-field";
            public const string kViewOptionsField = "view-options-field";
            public const string kContentContainer = "content-container";
            public const string kMainContainer = "main-container";
            public const string kPassList = "pass-list";
            public const string kPassListScrollView = "pass-list-scroll-view";
            public const string kResourceListScrollView = "resource-list-scroll-view";
            public const string kResourceGridScrollView = "resource-grid-scroll-view";
            public const string kResourceGrid = "resource-grid";
            public const string kGridlineContainer = "grid-line-container";
            public const string kHoverOverlay = "hover-overlay";
            public const string kEmptyStateMessage = "empty-state-message";
            public const string kPassListCornerOccluder = "pass-list-corner-occluder";
            public const string kStatusLabel = "status-label";
        }

        internal static partial class Classes
        {
            public const string kPassListItem = "pass-list__item";
            public const string kPassTitle = "pass-title";
            public const string kPassBlock = "pass-block";
            public const string kPassBlockScriptLink = "pass-block-script-link";
            public const string kPassBlockCulledPass = "pass-block--culled";
            public const string kPassBlockAsyncPass = "pass-block--async";
            public const string kPassHighlight = "pass--highlight";
            public const string kPassHoverHighlight = "pass--hover-highlight";
            public const string kPassHighlightBorder = "pass--highlight-border";
            public const string kPassMergeIndicator = "pass-merge-indicator";
            public const string kPassCompatibilityMessageIndicator = "pass-compatibility-message-indicator";
            public const string kPassCompatibilityMessageIndicatorAnimation = "pass-compatibility-message-indicator--anim";
            public const string kPassCompatibilityMessageIndicatorCompatible = "pass-compatibility-message-indicator--compatible";
            public const string kPassSynchronizationMessageIndicator = "pass-synchronization-message-indicator";
            public const string kResourceListItem = "resource-list__item";
            public const string kResourceListItemHighlight = "resource-list__item--highlight";
            public const string kResourceListPaddingItem = "resource-list-padding-item";
            public const string kResourceIconContainer = "resource-icon-container";
            public const string kResourceIcon = "resource-icon";
            public const string kResourceIconImported = "resource-icon--imported";
            public const string kResourceIconMultipleUsage = "resource-icon--multiple-usage";
            public const string kResourceIconGlobalDark = "resource-icon--global-dark";
            public const string kResourceIconGlobalLight = "resource-icon--global-light";
            public const string kResourceIconFbfetch = "resource-icon--fbfetch";
            public const string kResourceIconTexture = "resource-icon--texture";
            public const string kResourceIconMemorylessTexture = "resource-icon--memoryless-texture";
            public const string kResourceIconBuffer = "resource-icon--buffer";
            public const string kResourceIconAccelerationStructure = "resource-icon--acceleration-structure";
            public const string kResourceGridRow = "resource-grid__row";
            public const string kResourceGridFocusOverlay = "resource-grid-focus-overlay";
            public const string kResourceHelperLine = "resource-helper-line";
            public const string kResourceHelperLineHighlight = "resource-helper-line--highlight";
            public const string kResourceUsageRangeBlock = "usage-range-block";
            public const string kResourceUsageRangeBlockHighlight = "usage-range-block--highlight";
            public const string kResourceDependencyBlock = "dependency-block";
            public const string kResourceDependencyBlockRead = "dependency-block-read";
            public const string kResourceDependencyBlockWrite = "dependency-block-write";
            public const string kResourceDependencyBlockReadWrite = "dependency-block-readwrite";
            public const string kGridLine = "grid-line";
            public const string kGridLineHighlight = "grid-line--highlight";
            public const string kLoadAction = "dependency-block-load-action";
            public const string kLoadActionLoad = "load-action-load";
            public const string kLoadActionClear = "load-action-clear";
            public const string kLoadActionDontCare = "load-action-dont-care";
            public const string kStoreAction = "dependency-block-store-action";
            public const string kStoreActionStore = "store-action-store";
            public const string kStoreActionResolve = "store-action-resolve";
            public const string kStoreActionStoreAndResolve = "store-action-store-resolve";
            public const string kStoreActionDontCare = "store-action-dont-care";
            public const string kLoadActionBorder = "dependency-block-load-action-border";
            public const string kStoreActionBorder = "dependency-block-store-action-border";
        }

        const string k_TemplatePath = "Packages/com.unity.render-pipelines.core/Editor/UXML/RenderGraphViewer.uxml";
        const string k_DarkStylePath = "Packages/com.unity.render-pipelines.core/Editor/StyleSheets/RenderGraphViewerDark.uss";
        const string k_LightStylePath = "Packages/com.unity.render-pipelines.core/Editor/StyleSheets/RenderGraphViewerLight.uss";
        const string k_ResourceListIconPath = "Packages/com.unity.render-pipelines.core/Editor/Icons/RenderGraphViewer/{0}Resources@2x.png";
        const string k_PassListIconPath = "Packages/com.unity.render-pipelines.core/Editor/Icons/RenderGraphViewer/{0}PassInspector@2x.png";
        const string k_EditorName ="Editor";

        // keep in sync with .uss
        const int kPassWidthPx = 26;
        const int kResourceRowHeightPx = 30;
        const int kResourceColumnWidth = 220;
        const int kResourceIconSize = 16;
        const int kResourceGridMarginTopPx = 6;
        const int kDependencyBlockHeightPx = 26;
        const int kDependencyBlockWidthPx = kPassWidthPx;
        const int kPassTitleAllowanceMargin = 120;
        const int kHeaderContainerHeightPx = 24;

        static readonly Color kReadWriteBlockFillColorDark = new Color32(0xA9, 0xD1, 0x36, 255);
        static readonly Color kReadWriteBlockFillColorLight = new Color32(0x67, 0x9C, 0x33, 255);

        internal RenderGraph.DebugData m_CurrentDebugData;

        PlayerConnection m_PlayerConnection;

        bool m_Paused = false;

        static int s_EditorWindowInstanceId;
        DateTime m_LastDataCaptureTime = DateTime.MinValue;
        string m_ConnectedDeviceName = "Local Editor";
        bool m_IsDeviceConnected = true;

        bool HasValidDebugData => m_CurrentDebugData != null && m_CurrentDebugData.valid;

        Foldout m_ResourcesList;
        Foldout m_PassList;
        PanManipulator m_PanManipulator;
        Texture2D m_ResourceListIcon;
        Texture2D m_PassListIcon;

        readonly List<PassElementInfo> m_PassElementsInfo = new(); // Indexed using visiblePassIndex
        readonly List<ResourceElementInfo> m_ResourceElementsInfo = new(); // Indexed using visibleResourceIndex
        readonly Dictionary<int, int> m_PassIdToVisiblePassIndex = new();
        readonly Dictionary<int, int> m_VisiblePassIndexToPassId = new();

        int m_CurrentHoveredVisiblePassIndex = -1;
        int m_CurrentHoveredVisibleResourceIndex = -1;
        int m_CurrentSelectedVisiblePassIndex = -1;

        const string kPassFilterLegacyEditorPrefsKey = "RenderGraphViewer.PassFilterLegacy";
        const string kPassFilterEditorPrefsKey = "RenderGraphViewer.PassFilter";
        const string kResourceFilterEditorPrefsKey = "RenderGraphViewer.ResourceFilter";
        const string kSelectedExecutionEditorPrefsKey = "RenderGraphViewer.SelectedExecution";
        const string kViewOptionsEditorPrefsKey = "RenderGraphViewer.ViewOptions";

        IVisualElementScheduledItem m_StoreSelectedExecutionDelayed;
        IVisualElementScheduledItem m_RefreshUIDelayed;

        PassFilter m_PassFilter = PassFilter.CulledPasses | PassFilter.RasterPasses | PassFilter.UnsafePasses | PassFilter.ComputePasses;
        PassFilterLegacy m_PassFilterLegacy = PassFilterLegacy.CulledPasses;

        ResourceFilter m_ResourceFilter =
            ResourceFilter.ImportedResources |  ResourceFilter.Textures |
            ResourceFilter.Buffers | ResourceFilter.AccelerationStructures;

        ViewOptions m_ViewOptions = ViewOptions.LoadStoreActions;

        bool m_PassFilterEnabled = true;
        bool m_ResourceFilterEnabled = true;
        bool m_ViewOptionsEnabled = false;

        enum EmptyStateReason
        {
            None = 0,
            NoGraphRegistered,
            WaitingForCameraRender,
            EmptyPassFilterResult,
            EmptyResourceFilterResult,
            IncompatibleDataReceived
        };

        static readonly string[] kEmptyStateMessages =
        {
            "",
            L10n.Tr("No Render Graph has been registered. The Render Graph Viewer is only functional when Render Graph API is in use."),
            L10n.Tr("Waiting for the selected camera to render. Depending on the camera, you may need to trigger rendering by selecting the Scene or Game view.\n\nEnsure Render Graph is not disabled in Project Settings > Graphics."),
            L10n.Tr("No passes to display. Select a different Pass Filter to display contents."),
            L10n.Tr("No resources to display. Select a different Resource Filter to display contents."),
            L10n.Tr("Editor received incompatible data. Rebuild the player with this version of the editor, or switch to an older version of the editor."),
        };

        private static readonly string[] kLoadActionNames =
        {
            "",
            L10n.Tr("Load"),
            L10n.Tr("Clear"),
            L10n.Tr("Don't Care"),
        };

        private static readonly string[] kStoreActionNames =
        {
            "",
            L10n.Tr("Store"),
            L10n.Tr("Resolve"),
            L10n.Tr("Store and Resolve"),
            L10n.Tr("Don't Care"),
        };

        static readonly string kOpenInCSharpEditorTooltip = L10n.Tr("Click to open <b>{0}</b> definition in C# editor.");

        [MenuItem("Window/Analysis/Render Graph Viewer", false, 10006)]
        static void Init()
        {
            var window = GetWindow<RenderGraphViewer>();
            window.titleContent = new GUIContent("Render Graph Viewer");
            window.minSize = new Vector2(880f, 300f);
        }

        [Flags]
        enum PassFilterLegacy
        {
            CulledPasses = 1 << 0,
        }

        [Flags]
        enum PassFilter
        {
            CulledPasses = 1 << 0,
            RasterPasses = 1 << 1,
            UnsafePasses = 1 << 2,
            ComputePasses = 1 << 3,
        }

        [Flags]
        enum ResourceFilter
        {
            ImportedResources = 1 << 0,
            Textures = 1 << 1,
            Buffers = 1 << 2,
            AccelerationStructures = 1 << 3,
        }

        [Flags]
        enum ViewOptions
        {
            LoadStoreActions = 1 << 0,
        }

        class ResourceElementInfo
        {
            public RenderGraphResourceType type;
            public int index;
            public VisualElement usageRangeBlock;
            public VisualElement resourceListItem;
            public VisualElement resourceHelperLine;
            public int firstPassId;
            public int lastPassId;
        }

        class ResourceRWBlock
        {
            [Flags]
            public enum UsageFlags
            {
                None = 0,
                UpdatesGlobalResource = 1 << 0,
                FramebufferFetch = 1 << 1,
            }

            public enum LoadAction
            {
                None,
                Load,
                Clear,
                DontCare,
            }

            public enum StoreAction
            {
                None,
                Store,
                Resolve,
                StoreAndResolve,
                DontCare,
            }

            public VisualElement element;
            public string tooltip;
            public int visibleResourceIndex;
            public bool read;
            public bool write;
            public bool memoryless;
            public LoadAction load;
            public StoreAction store;
            public UsageFlags usage;

            public bool HasMultipleUsageFlags()
            {
                // Check if usage is a power of 2, meaning only one bit is set
                return usage != 0 && (usage & (usage - 1)) != 0;
            }
        }

        class PassElementInfo
        {
            public int passId;
            public VisualElement passBlock;
            public PassTitleLabel passTitle;
            public bool isCulled;
            public bool isAsync;

            // List of resource blocks read/written to by this pass
            public readonly List<ResourceRWBlock> resourceBlocks = new();

            public VisualElement leftGridLine;
            public VisualElement rightGridLine;

            public bool hasPassCompatibilityTooltip;
            public bool isPassCompatibleToMerge;
            public bool hasAsyncDependencyTooltip;
        }

        void AppendToTooltipIfNotEmpty(VisualElement elem, string append)
        {
            if (elem.tooltip.Length > 0)
                elem.tooltip += append;
        }

        void ResetPassBlockState()
        {
            foreach (var info in m_PassElementsInfo)
            {
                info.hasPassCompatibilityTooltip = false;
                info.isPassCompatibleToMerge = false;
                info.hasAsyncDependencyTooltip = false;

                info.passBlock.RemoveFromClassList(Classes.kPassBlockCulledPass);
                info.passBlock.tooltip = string.Empty;
                if (info.isCulled)
                {
                    info.passBlock.AddToClassList(Classes.kPassBlockCulledPass);
                    info.passBlock.tooltip = "Culled pass";
                }

                info.passBlock.RemoveFromClassList(Classes.kPassBlockAsyncPass);
                if (info.isAsync)
                {
                    info.passBlock.AddToClassList(Classes.kPassBlockAsyncPass);
                    AppendToTooltipIfNotEmpty(info.passBlock, $"{Environment.NewLine}");
                    info.passBlock.tooltip += "Async Compute Pass";
                }

                var groupedIds = GetGroupedPassIds(info.passId);
                if (groupedIds.Count > 1)
                {
                    AppendToTooltipIfNotEmpty(info.passBlock, $"{Environment.NewLine}");
                    info.passBlock.tooltip += $"{groupedIds.Count} Raster Render Passes merged into a single Native Render Pass";
                }

                AppendToTooltipIfNotEmpty(info.passBlock, $"{Environment.NewLine}{Environment.NewLine}");
                info.passBlock.tooltip += string.Format(kOpenInCSharpEditorTooltip, info.passTitle.text);
            }
        }

        void UpdatePassBlocksToSelectedState(List<int> selectedPassIds)
        {
            // Hide culled/async pass indicators when a block is selected
            foreach (var info in m_PassElementsInfo)
            {
                info.passBlock.RemoveFromClassList(Classes.kPassBlockCulledPass);
                info.passBlock.RemoveFromClassList(Classes.kPassBlockAsyncPass);
                info.passBlock.tooltip = string.Empty;
            }

            foreach (var passIdInGroup in selectedPassIds)
            {
                var pass = m_CurrentDebugData.passList[passIdInGroup];

                // Native pass compatibility
                if (m_CurrentDebugData.isNRPCompiler)
                {
                    if (pass.nrpInfo.nativePassInfo != null && pass.nrpInfo.nativePassInfo.passCompatibility.Count > 0)
                    {
                        foreach (var msg in pass.nrpInfo.nativePassInfo.passCompatibility)
                        {
                            int linkedPassId = msg.Key;
                            string compatibilityMessage = msg.Value.message;
                            var linkedPassGroup = GetGroupedPassIds(linkedPassId);
                            foreach (var passIdInLinkedPassGroup in linkedPassGroup)
                            {
                                if (selectedPassIds.Contains(passIdInLinkedPassGroup))
                                    continue; // Don't show compatibility info among passes that are merged

                                if (m_PassIdToVisiblePassIndex.TryGetValue(passIdInLinkedPassGroup,
                                        out int visiblePassIndexInLinkedPassGroup))
                                {
                                    var info = m_PassElementsInfo[visiblePassIndexInLinkedPassGroup];
                                    info.hasPassCompatibilityTooltip = true;
                                    info.isPassCompatibleToMerge = msg.Value.isCompatible;
                                    info.passBlock.tooltip = compatibilityMessage;
                                }
                            }
                        }

                        // Each native pass has compatibility messages, it's enough to process the first one
                        break;
                    }
                }

                // Async compute dependencies
                if (m_PassIdToVisiblePassIndex.TryGetValue(pass.syncFromPassIndex, out int visibleSyncFromPassIndex))
                {
                    var syncFromPassInfo = m_PassElementsInfo[visibleSyncFromPassIndex];
                    syncFromPassInfo.hasAsyncDependencyTooltip = true;
                    AppendToTooltipIfNotEmpty(syncFromPassInfo.passBlock, $"{Environment.NewLine}");
                    syncFromPassInfo.passBlock.tooltip +=
                        "Currently selected Async Compute Pass inserts a GraphicsFence, which this pass waits on.";
                }

                if (m_PassIdToVisiblePassIndex.TryGetValue(pass.syncToPassIndex, out int visibleSyncToPassIndex))
                {
                    var syncToPassInfo = m_PassElementsInfo[visibleSyncToPassIndex];
                    syncToPassInfo.hasAsyncDependencyTooltip = true;
                    AppendToTooltipIfNotEmpty(syncToPassInfo.passBlock, $"{Environment.NewLine}");
                    syncToPassInfo.passBlock.tooltip +=
                        "Currently selected Async Compute Pass waits on a GraphicsFence inserted after this pass.";
                }
            }

            foreach (var info in m_PassElementsInfo)
            {
                AppendToTooltipIfNotEmpty(info.passBlock, $"{Environment.NewLine}{Environment.NewLine}");
                info.passBlock.tooltip += string.Format(kOpenInCSharpEditorTooltip, info.passTitle.text);
            }
        }

        [Flags]
        enum ResourceHighlightOptions
        {
            None = 1 << 0,
            ResourceListItem = 1 << 1,
            ResourceUsageRangeBorder = 1 << 2,
            ResourceHelperLine = 1 << 3,

            All = ResourceListItem | ResourceUsageRangeBorder | ResourceHelperLine
        }

        void ClearResourceHighlight(ResourceHighlightOptions highlightOptions = ResourceHighlightOptions.All)
        {
            if (highlightOptions.HasFlag(ResourceHighlightOptions.ResourceListItem))
            {
                rootVisualElement.Query(classes: Classes.kResourceListItem).ForEach(elem =>
                {
                    elem.RemoveFromClassList(Classes.kResourceListItemHighlight);
                });
            }

            if (highlightOptions.HasFlag(ResourceHighlightOptions.ResourceUsageRangeBorder))
            {
                rootVisualElement.Query(classes: Classes.kResourceUsageRangeBlockHighlight).ForEach(elem =>
                {
                    elem.RemoveFromHierarchy();
                });
            }

            if (highlightOptions.HasFlag(ResourceHighlightOptions.ResourceHelperLine))
            {
                rootVisualElement.Query(classes: Classes.kResourceHelperLineHighlight).ForEach(elem =>
                {
                    elem.RemoveFromClassList(Classes.kResourceHelperLineHighlight);
                });
            }
        }

        void SetResourceHighlight(ResourceElementInfo info, int visibleResourceIndex, ResourceHighlightOptions highlightOptions)
        {
            if (highlightOptions.HasFlag(ResourceHighlightOptions.ResourceListItem))
            {
                info.resourceListItem.AddToClassList(Classes.kResourceListItemHighlight);
            }

            if (highlightOptions.HasFlag(ResourceHighlightOptions.ResourceUsageRangeBorder))
            {
                var usageRangeHighlightBlock = new VisualElement();
                usageRangeHighlightBlock.style.left = info.usageRangeBlock.style.left.value.value;
                usageRangeHighlightBlock.style.width = info.usageRangeBlock.style.width.value.value + 1.0f;
                usageRangeHighlightBlock.style.top =  visibleResourceIndex * kResourceRowHeightPx;
                usageRangeHighlightBlock.pickingMode = PickingMode.Ignore;
                usageRangeHighlightBlock.AddToClassList(Classes.kResourceUsageRangeBlockHighlight);

                rootVisualElement.Q<VisualElement>(Names.kResourceGrid).parent.Add(usageRangeHighlightBlock);
                usageRangeHighlightBlock.PlaceInFront(rootVisualElement.Q<VisualElement>(Names.kGridlineContainer));
            }

            if (highlightOptions.HasFlag(ResourceHighlightOptions.ResourceHelperLine))
            {
                info.resourceHelperLine.AddToClassList(Classes.kResourceHelperLineHighlight);
            }
        }

        [Flags]
        enum PassHighlightOptions
        {
            None = 1 << 0,
            PassBlockBorder = 1 << 1,
            PassBlockFill = 1 << 2,
            PassTitle = 1 << 3,
            PassGridLines = 1 << 4,
            ResourceRWBlocks = 1 << 5,
            PassesWithCompatibilityMessage = 1 << 6,
            PassesWithSynchronizationMessage = 1 << 7,
            ResourceGridFocusOverlay = 1 << 8,
            PassTitleHover = 1 << 9,

            All = PassBlockBorder | PassBlockFill | PassTitle | PassGridLines | ResourceRWBlocks |
                  PassesWithCompatibilityMessage | PassesWithSynchronizationMessage | ResourceGridFocusOverlay | PassTitleHover
        }

        void ClearPassHighlight(PassHighlightOptions highlightOptions = PassHighlightOptions.All)
        {
            // Remove pass block & title highlight
            foreach (var info in m_PassElementsInfo)
            {
                if (highlightOptions.HasFlag(PassHighlightOptions.PassTitle))
                    info.passTitle.RemoveFromClassList(Classes.kPassHighlight);
                if (highlightOptions.HasFlag(PassHighlightOptions.PassTitleHover))
                    info.passTitle.RemoveFromClassList(Classes.kPassHoverHighlight);
                if (highlightOptions.HasFlag(PassHighlightOptions.PassBlockBorder))
                    info.passBlock.RemoveFromClassList(Classes.kPassHighlightBorder);
                if (highlightOptions.HasFlag(PassHighlightOptions.PassBlockFill))
                    info.passBlock.RemoveFromClassList(Classes.kPassHighlight);
                if (highlightOptions.HasFlag(PassHighlightOptions.PassesWithCompatibilityMessage))
                {
                    info.passBlock.RemoveFromClassList(Classes.kPassCompatibilityMessageIndicator);
                    info.passBlock.RemoveFromClassList(Classes.kPassCompatibilityMessageIndicatorAnimation);
                    info.passBlock.RemoveFromClassList(Classes.kPassCompatibilityMessageIndicatorCompatible);
                    info.passBlock.UnregisterCallback<TransitionEndEvent, VisualElement>(ToggleCompatiblePassAnimation);
                }

                if (highlightOptions.HasFlag(PassHighlightOptions.PassesWithSynchronizationMessage))
                    info.passBlock.RemoveFromClassList(Classes.kPassSynchronizationMessageIndicator);
            }

            // Remove grid line highlight
            if (highlightOptions.HasFlag(PassHighlightOptions.PassGridLines))
            {
                rootVisualElement.Query(classes: Classes.kGridLine).ForEach(elem =>
                {
                    elem.RemoveFromClassList(Classes.kGridLineHighlight);
                });
            }

            // Remove focus overlay
            if (highlightOptions.HasFlag(PassHighlightOptions.ResourceGridFocusOverlay))
            {
                rootVisualElement.Query(classes: Classes.kResourceGridFocusOverlay).ForEach(elem =>
                {
                    elem.RemoveFromHierarchy();
                });
            }
        }

        void SetPassHighlight(int visiblePassIndex, PassHighlightOptions highlightOptions)
        {
            if (!m_VisiblePassIndexToPassId.TryGetValue(visiblePassIndex, out int passId))
                return;

            var groupedPassIds = GetGroupedPassIds(passId);

            // Add pass block & title highlight
            List<PassElementInfo> visiblePassInfos = new();
            foreach (int groupedPassId in groupedPassIds)
            {
                if (m_PassIdToVisiblePassIndex.TryGetValue(groupedPassId, out int groupedVisiblePassIndex))
                {
                    var info = m_PassElementsInfo[groupedVisiblePassIndex];
                    if (highlightOptions.HasFlag(PassHighlightOptions.PassTitle))
                        info.passTitle.AddToClassList(Classes.kPassHighlight);
                    if (highlightOptions.HasFlag(PassHighlightOptions.PassTitleHover))
                        info.passTitle.AddToClassList(Classes.kPassHoverHighlight);
                    if (highlightOptions.HasFlag(PassHighlightOptions.PassBlockBorder))
                        info.passBlock.AddToClassList(Classes.kPassHighlightBorder);
                    if (highlightOptions.HasFlag(PassHighlightOptions.PassBlockFill))
                        info.passBlock.AddToClassList(Classes.kPassHighlight);
                    visiblePassInfos.Add(info);
                }
            }

            foreach (var info in m_PassElementsInfo)
            {
                if (groupedPassIds.Contains(info.passId))
                    continue;

                if (highlightOptions.HasFlag(PassHighlightOptions.PassesWithCompatibilityMessage) &&
                    info.hasPassCompatibilityTooltip)
                {
                    info.passBlock.AddToClassList(Classes.kPassCompatibilityMessageIndicator);
                    if (info.isPassCompatibleToMerge)
                    {
                        info.passBlock.schedule.Execute(() =>
                        {
                            info.passBlock.AddToClassList(Classes.kPassCompatibilityMessageIndicatorAnimation);
                            info.passBlock.AddToClassList(Classes.kPassCompatibilityMessageIndicatorCompatible);
                        }).StartingIn(100);
                        info.passBlock.RegisterCallback<TransitionEndEvent, VisualElement>(
                            ToggleCompatiblePassAnimation, info.passBlock);
                    }
                }

                if (highlightOptions.HasFlag(PassHighlightOptions.PassesWithSynchronizationMessage) &&
                    info.hasAsyncDependencyTooltip)
                    info.passBlock.AddToClassList(Classes.kPassSynchronizationMessageIndicator);
            }

            // Add grid line highlight
            if (highlightOptions.HasFlag(PassHighlightOptions.PassGridLines))
            {
                var firstVisiblePassInfo = visiblePassInfos[0];
                firstVisiblePassInfo.leftGridLine.AddToClassList(Classes.kGridLineHighlight);

                int nextVisiblePassIndex = FindNextVisiblePassIndex(visiblePassInfos[^1].passId + 1);
                if (nextVisiblePassIndex != -1)
                    m_PassElementsInfo[nextVisiblePassIndex].leftGridLine.AddToClassList(Classes.kGridLineHighlight);
                else
                    rootVisualElement.Query(classes: Classes.kGridLine).Last()
                        .AddToClassList(Classes.kGridLineHighlight);
            }

            if (highlightOptions.HasFlag(PassHighlightOptions.ResourceGridFocusOverlay))
            {
                int firstPassIndex = FindNextVisiblePassIndex(groupedPassIds[0]);
                int afterLastPassIndex = FindNextVisiblePassIndex(groupedPassIds[^1] + 1);
                int focusOverlayHeightPx = m_ResourceElementsInfo.Count * kResourceRowHeightPx + kResourceGridMarginTopPx;
                int leftWidth = firstPassIndex * kPassWidthPx;
                int rightWidth = (m_PassElementsInfo.Count - afterLastPassIndex) * kPassWidthPx;

                VisualElement left = new VisualElement();
                left.AddToClassList(Classes.kResourceGridFocusOverlay);
                left.style.marginTop = kResourceGridMarginTopPx;
                left.style.width = leftWidth;
                left.style.height = focusOverlayHeightPx;
                left.pickingMode = PickingMode.Ignore;

                VisualElement right = new VisualElement();
                right.AddToClassList(Classes.kResourceGridFocusOverlay);
                right.style.marginTop = kResourceGridMarginTopPx;
                right.style.marginLeft = afterLastPassIndex * kPassWidthPx;
                right.style.width = rightWidth;
                right.style.height = focusOverlayHeightPx;
                right.pickingMode = PickingMode.Ignore;

                var resourceGridScrollView = rootVisualElement.Q<ScrollView>(Names.kResourceGridScrollView);
                resourceGridScrollView.Add(left);
                resourceGridScrollView.Add(right);
            }
        }

        void ToggleCompatiblePassAnimation(TransitionEndEvent _, VisualElement element)
        {
            element.ToggleInClassList(Classes.kPassCompatibilityMessageIndicatorCompatible);
        }

        // Returns a list of passes containing the pass itself and potentially others (if merging happened)
        List<int> GetGroupedPassIds(int passId)
        {
            var pass = m_CurrentDebugData.passList[passId];
            return pass.nrpInfo?.nativePassInfo?.mergedPassIds ?? new List<int> { passId };
        }

        bool SelectResource(int visibleResourceIndex, int visiblePassIndex)
        {
            bool validResourceIndex = visibleResourceIndex >= 0 && visibleResourceIndex < m_ResourceElementsInfo.Count;
            if (!validResourceIndex)
                return false;

            var resInfo = m_ResourceElementsInfo[visibleResourceIndex];
            if (m_VisiblePassIndexToPassId.TryGetValue(visiblePassIndex, out int passId))
            {
                if (passId >= resInfo.firstPassId && passId <= resInfo.lastPassId)
                {
                    ScrollToResource(visibleResourceIndex);
                    return true;
                }
            }

            return false;
        }

        void SelectPass(int visiblePassIndex)
        {
            m_CurrentSelectedVisiblePassIndex = visiblePassIndex;

            const PassHighlightOptions opts = PassHighlightOptions.PassTitle |
                                              PassHighlightOptions.PassBlockFill |
                                              PassHighlightOptions.PassGridLines |
                                              PassHighlightOptions.PassBlockBorder |
                                              PassHighlightOptions.ResourceRWBlocks |
                                              PassHighlightOptions.PassesWithCompatibilityMessage |
                                              PassHighlightOptions.PassesWithSynchronizationMessage |
                                              PassHighlightOptions.ResourceGridFocusOverlay;

            ClearPassHighlight(opts);
            ResetPassBlockState();

            if (m_VisiblePassIndexToPassId.TryGetValue(visiblePassIndex, out int passId))
            {
                var selectedPassIds = GetGroupedPassIds(passId);
                UpdatePassBlocksToSelectedState(selectedPassIds);
                SetPassHighlight(visiblePassIndex, opts);
                ScrollToPass(m_PassIdToVisiblePassIndex[selectedPassIds[0]]);
            }
        }

        void HoverPass(int visiblePassIndex, int visibleResourceIndex)
        {
            if (m_CurrentHoveredVisiblePassIndex != visiblePassIndex ||
                m_CurrentHoveredVisibleResourceIndex != visibleResourceIndex)
            {
                var highlight = PassHighlightOptions.PassBlockBorder |
                                PassHighlightOptions.PassGridLines |
                                PassHighlightOptions.PassBlockFill |
                                PassHighlightOptions.PassTitleHover;

                if (m_CurrentSelectedVisiblePassIndex != -1)
                {
                    // Don't highlight or clear these when a pass is selected
                    highlight &= ~(PassHighlightOptions.PassTitle | PassHighlightOptions.PassBlockFill |
                                   PassHighlightOptions.PassBlockBorder | PassHighlightOptions.PassGridLines);
                }

                if (m_CurrentHoveredVisiblePassIndex != -1)
                    ClearPassHighlight(highlight);

                if (visibleResourceIndex != -1) // Don't highlight these while mouse is on resource grid
                    highlight &= ~(PassHighlightOptions.PassBlockFill | PassHighlightOptions.PassTitleHover);

                if (visiblePassIndex != -1)
                    SetPassHighlight(visiblePassIndex, highlight);
            }
        }

        void HoverResourceByIndex(int visibleResourceIndex, int visiblePassIndex)
        {
            if (m_CurrentHoveredVisibleResourceIndex != visibleResourceIndex ||
                m_CurrentHoveredVisiblePassIndex != visiblePassIndex)
            {
                var highlight = ResourceHighlightOptions.ResourceUsageRangeBorder | ResourceHighlightOptions.ResourceHelperLine;
                if (m_CurrentHoveredVisibleResourceIndex >= 0 &&
                    m_CurrentHoveredVisibleResourceIndex < m_ResourceElementsInfo.Count)
                {
                    ClearResourceHighlight(highlight);
                    rootVisualElement.Q(Names.kHoverOverlay).AddToClassList(PanManipulator.k_ContentPanClassName);
                    m_PanManipulator.canStartDragging = true;
                }

                if (visibleResourceIndex != -1)
                {
                    var info = m_ResourceElementsInfo[visibleResourceIndex];
                    if (m_VisiblePassIndexToPassId.TryGetValue(visiblePassIndex, out int passId))
                    {
                        bool disablePanning = false;
                        var passInfo = m_PassElementsInfo[visiblePassIndex];
                        foreach (var res in passInfo.resourceBlocks)
                        {
                            if (res.visibleResourceIndex == visibleResourceIndex &&
                                res.usage.HasFlag(ResourceRWBlock.UsageFlags.UpdatesGlobalResource))
                            {
                                disablePanning = true;
                            }
                        }

                        if (passId >= info.firstPassId && passId <= info.lastPassId)
                        {
                            SetResourceHighlight(info, visibleResourceIndex, highlight);
                            disablePanning = true;
                        }

                        if (disablePanning)
                        {
                            rootVisualElement.Q(Names.kHoverOverlay)
                                .RemoveFromClassList(PanManipulator.k_ContentPanClassName);
                            m_PanManipulator.canStartDragging = false;
                        }
                    }
                }
            }
        }

        void HoverResourceGrid(int visiblePassIndex, int visibleResourceIndex)
        {
            if (m_PanManipulator is { dragActive: true })
            {
                visiblePassIndex = -1;
                visibleResourceIndex = -1;
            }

            HoverPass(visiblePassIndex, visibleResourceIndex);
            HoverResourceByIndex(visibleResourceIndex, visiblePassIndex);
            m_CurrentHoveredVisiblePassIndex = visiblePassIndex;
            m_CurrentHoveredVisibleResourceIndex = visibleResourceIndex;
        }

        void GetVisiblePassAndResourceIndex(Vector2 pos, out int visiblePassIndex, out int visibleResourceIndex)
        {
            visiblePassIndex = Math.Min(Mathf.FloorToInt(pos.x / kPassWidthPx), m_PassElementsInfo.Count - 1);
            visibleResourceIndex = Math.Min(Mathf.FloorToInt(pos.y / kResourceRowHeightPx),
                m_ResourceElementsInfo.Count - 1);
        }

        void ResourceGridHovered(MouseMoveEvent evt)
        {
            GetVisiblePassAndResourceIndex(evt.localMousePosition, out int visiblePassIndex,
                out int visibleResourceIndex);
            HoverResourceGrid(visiblePassIndex, visibleResourceIndex);
        }

        void ResourceGridClicked(ClickEvent evt)
        {
            GetVisiblePassAndResourceIndex(evt.localPosition, out int visiblePassIndex, out int visibleResourceIndex);

            bool selectedResource = SelectResource(visibleResourceIndex, visiblePassIndex);

            // Also select pass when clicking on resource
            if (selectedResource)
                SelectPass(visiblePassIndex);

            // Clicked grid background, clear selection
            if (!selectedResource)
                DeselectPass();

            evt.StopImmediatePropagation(); // Required because to root element click deselects
        }

        void PassBlockClicked(ClickEvent evt, int visiblePassIndex)
        {
            SelectPass(visiblePassIndex);
            evt.StopImmediatePropagation(); // Required because to root element click deselects
        }

        void ResourceGridTooltipDisplayed(TooltipEvent evt)
        {
            evt.tooltip = string.Empty;
            if (m_CurrentHoveredVisibleResourceIndex != -1 && m_CurrentHoveredVisiblePassIndex != -1)
            {
                var passInfo = m_PassElementsInfo[m_CurrentHoveredVisiblePassIndex];
                var resourceInfo = m_ResourceElementsInfo[m_CurrentHoveredVisibleResourceIndex];
                var passId = m_VisiblePassIndexToPassId[m_CurrentHoveredVisiblePassIndex];

                foreach (var rwBlock in passInfo.resourceBlocks)
                {
                    if (rwBlock.visibleResourceIndex == m_CurrentHoveredVisibleResourceIndex)
                    {
                        evt.tooltip = rwBlock.tooltip;
                        evt.rect = rwBlock.element.worldBound;
                        break;
                    }
                }

                if (evt.tooltip == string.Empty &&
                    passId >= resourceInfo.firstPassId && passId <= resourceInfo.lastPassId)
                {
                    evt.tooltip = "Resource is alive but not used by this pass.";
                    evt.rect = resourceInfo.usageRangeBlock.worldBound;
                }
            }

            evt.StopPropagation();
        }

        void DeselectPass()
        {
            SelectPass(-1);
            m_CurrentHoveredVisiblePassIndex = -1;
            m_CurrentHoveredVisibleResourceIndex = -1;
        }

        void KeyPressed(KeyUpEvent evt)
        {
            if (evt.keyCode == KeyCode.Escape)
                DeselectPass();
        }

        void ClearEmptyStateMessage()
        {
            rootVisualElement.Q<VisualElement>(Names.kContentContainer).style.display = DisplayStyle.Flex;
            rootVisualElement.Q<VisualElement>(Names.kEmptyStateMessage).style.display = DisplayStyle.None;
        }

        void SetEmptyStateMessage(EmptyStateReason reason)
        {
            rootVisualElement.Q<VisualElement>(Names.kContentContainer).style.display = DisplayStyle.None;

            var emptyStateElement = rootVisualElement.Q<VisualElement>(Names.kEmptyStateMessage);
            emptyStateElement.style.display = DisplayStyle.Flex;
            if (emptyStateElement[0] is TextElement emptyStateText)
                emptyStateText.text = $"{kEmptyStateMessages[(int) reason]}";
        }

        void OnAutoPlayStatusChanged(ChangeEvent<bool> evt)
        {
            var autoPlayToggle = rootVisualElement.Q<ToolbarToggle>(Names.kAutoPauseToggle);
            autoPlayToggle.text = evt.newValue ? L10n.Tr("Auto Update") : L10n.Tr("Pause");
            m_Paused = evt.newValue;

            if (!m_Paused && !m_IsDeviceConnected && m_ConnectedDeviceName != k_EditorName)
            {
                ConnectDebugSession<RenderGraphEditorLocalDebugSession>();
            }

            UpdateStatusLabel();

            // Force update when unpausing
            if (!m_Paused)
                UpdateCurrentDebugData();
        }

        // Helper method to check if an enum value has a specific flag.
        bool HasFlag<T>(T value, T flag) where T : Enum
        {
            return (Convert.ToInt32(value) & Convert.ToInt32(flag)) == Convert.ToInt32(flag);
        }

        // Need to keep track of the ToggleDropdown event handlers to be able to remove them when rebuilding the UI
        readonly Dictionary<ToggleDropdown, Action<bool>> m_ToggleHandlers = new();
        readonly Dictionary<ToggleDropdown, Action<int[]>> m_SelectionHandlers = new();

        void BuildEnumFlagsToggleDropdown<T>(ToggleDropdown dropdown, T currentValue, string prefsKey, Action<T> setValue, bool defaultEnabled = true) where T : Enum
        {
            if (!HasValidDebugData)
            {
                dropdown.style.display = DisplayStyle.None;
                return;
            }
            dropdown.style.display = DisplayStyle.Flex;

            // Unsubscribe old handlers if present
            if (m_ToggleHandlers.TryGetValue(dropdown, out var oldToggleChanged))
                dropdown.toggleChanged -= oldToggleChanged;
            if (m_SelectionHandlers.TryGetValue(dropdown, out var oldSelectionChanged))
                dropdown.selectionChanged -= oldSelectionChanged;

            Array enumValues = Enum.GetValues(typeof(T));
            List<string> optionNames = new List<string>();
            List<T> values = new List<T>();

            for (int i = 0; i < enumValues.Length; i++)
            {
                T value = (T)enumValues.GetValue(i);
                int intValue = Convert.ToInt32(value);
                if (intValue != 0)
                {
                    values.Add(value);
                    optionNames.Add(ObjectNames.NicifyVariableName(value.ToString()));
                }
            }

            dropdown.SetOptions(optionNames.ToArray());

            var selectedIndices = new List<int>();
            for (int i = 0; i < values.Count; i++)
            {
                if (HasFlag(currentValue, values[i]))
                {
                    selectedIndices.Add(i);
                }
            }
            dropdown.SetSelectedIndices(selectedIndices.ToArray());

            bool isEnabled = GetFilterEnabledState(prefsKey, defaultEnabled);
            dropdown.SetEnabled(isEnabled);
            UpdateFilterEnabledState(prefsKey, isEnabled);

            Action<bool> toggleChanged = enabled =>
            {
                UpdateFilterEnabledState(prefsKey, enabled);
                SaveFilterEnabledState(prefsKey, enabled);
                RebuildGraphViewerUI();
            };

            Action<int[]> selectionChanged = indices =>
            {
                int newValueInt = 0;
                foreach (int index in indices)
                {
                    if (index >= 0 && index < values.Count)
                    {
                        newValueInt |= Convert.ToInt32(values[index]);
                    }
                }

                var newValue = (T)Enum.ToObject(typeof(T), newValueInt);
                setValue(newValue);
                EditorPrefs.SetInt(prefsKey, newValueInt);

                if (dropdown.value)
                {
                    RebuildGraphViewerUI();
                }
            };

            m_ToggleHandlers[dropdown] = toggleChanged;
            dropdown.toggleChanged += toggleChanged;

            m_SelectionHandlers[dropdown] = selectionChanged;
            dropdown.selectionChanged += selectionChanged;
        }

        bool GetFilterEnabledState(string prefsKey, bool defaultValue)
        {
            string enabledKey = prefsKey + "_Enabled";
            return EditorPrefs.GetBool(enabledKey, defaultValue);
        }

        void SaveFilterEnabledState(string prefsKey, bool enabled)
        {
            string enabledKey = prefsKey + "_Enabled";
            EditorPrefs.SetBool(enabledKey, enabled);
        }

        void UpdateFilterEnabledState(string prefsKey, bool enabled)
        {
            if (prefsKey == kPassFilterEditorPrefsKey || prefsKey == kPassFilterLegacyEditorPrefsKey)
                m_PassFilterEnabled = enabled;
            else if (prefsKey == kResourceFilterEditorPrefsKey)
                m_ResourceFilterEnabled = enabled;
            else if (prefsKey == kViewOptionsEditorPrefsKey)
                m_ViewOptionsEnabled = enabled;
        }

        void RebuildViewOptionsUI()
        {
            var viewOptions = rootVisualElement.Q<ToggleDropdown>(Names.kViewOptionsField);
            BuildEnumFlagsToggleDropdown(viewOptions, m_ViewOptions, kViewOptionsEditorPrefsKey, val => m_ViewOptions = val, false);
            viewOptions.text = L10n.Tr("View Options");
        }

        void RebuildResourceFilterUI()
        {
            var resourceFilter = rootVisualElement.Q<ToggleDropdown>(Names.kResourceFilterField);
            BuildEnumFlagsToggleDropdown(resourceFilter, m_ResourceFilter, kResourceFilterEditorPrefsKey, val => m_ResourceFilter = val, true);
            resourceFilter.text = L10n.Tr("Resource Filter");
        }

        void RebuildPassFilterUI()
        {
            var passFilter = rootVisualElement.Q<ToggleDropdown>(Names.kPassFilterField);
            if (m_CurrentDebugData?.isNRPCompiler ?? false)
            {
                BuildEnumFlagsToggleDropdown(passFilter, m_PassFilter, kPassFilterEditorPrefsKey, val => m_PassFilter = val, true);
            }
            else
            {
                BuildEnumFlagsToggleDropdown(passFilter, m_PassFilterLegacy, kPassFilterLegacyEditorPrefsKey, val => m_PassFilterLegacy = val, true);
            }
            passFilter.text = L10n.Tr("Pass Filter");
        }

        void RebuildAutoPlayUI()
        {
            var autoPlayToggle = rootVisualElement.Q<ToolbarToggle>(Names.kAutoPauseToggle);
            autoPlayToggle.UnregisterCallback<ChangeEvent<bool>>(OnAutoPlayStatusChanged);
            autoPlayToggle.RegisterCallback<ChangeEvent<bool>>(OnAutoPlayStatusChanged);
            autoPlayToggle.value = m_Paused;
            autoPlayToggle.text = m_Paused ? L10n.Tr("Auto Update") : L10n.Tr("Pause");
        }

        void UpdateSelectedGraphAndExecution()
        {
            m_ExecutionItems = RenderGraphDebugSession.GetExecutions(m_SelectedRenderGraph);

            var renderGraphDropdownField = rootVisualElement.Q<DropdownField>(Names.kCurrentGraphDropdown);

            // Update selected render graph
            var graphs = RenderGraphDebugSession.GetRegisteredGraphs();
            if (graphs.Count == 0 || renderGraphDropdownField == null)
            {
                m_SelectedRenderGraph = null;
                SetSelectedExecutionIndex(-1);
                return;
            }

            m_SelectedRenderGraph = graphs[0];
            renderGraphDropdownField.choices = graphs;
            renderGraphDropdownField.value = m_SelectedRenderGraph;

            //Hide the dropdown since we currently only allow one render graph anyway! We potentially want to reconsider
            //so we keep the code here for now.
            renderGraphDropdownField.style.display = DisplayStyle.None;

            // Update selected execution
            int newExecutionIndex = m_SelectedExecutionIndex;
            if (m_ExecutionItems.Count > 0)
            {
                string previousSelectedExecutionName = EditorPrefs.GetString(kSelectedExecutionEditorPrefsKey);

                int previousSelectedExecutionFoundIndex = -1;
                int previousSelectedExecutionFoundCount = 0;
                for (int i = 0; i < m_ExecutionItems.Count; i++)
                {
                    if (m_ExecutionItems[i].name == previousSelectedExecutionName)
                    {
                        previousSelectedExecutionFoundIndex = i;
                        previousSelectedExecutionFoundCount++;
                    }
                }

                // If nothing is selected, try to select a previously selected execution. Note that because we allow
                // duplicate camera names, if the camera name saved in EditorPrefs appears multiple times in the list,
                // we cannot know which one needs to be activated and therefore must ignore it.
                if (newExecutionIndex == -1 && previousSelectedExecutionFoundIndex != -1 && previousSelectedExecutionFoundCount == 1)
                    newExecutionIndex = previousSelectedExecutionFoundIndex;

                if (newExecutionIndex == -1)
                    newExecutionIndex = 0;
            }
            else
            {
                newExecutionIndex = -1;
            }

            SetSelectedExecutionIndex(newExecutionIndex);
        }

        string m_SelectedRenderGraph;

        List<RenderGraph.DebugExecutionItem> m_ExecutionItems;

        int m_SelectedExecutionIndex = -1;

        void SetSelectedExecutionIndex(int executionIndex)
        {
            if (m_SelectedExecutionIndex != executionIndex)
            {
                m_SelectedExecutionIndex = executionIndex;
                UpdateCurrentDebugData();
            }

            // Using a custom toolbar menu instead of default Dropdown in order to get access to allowDuplicateNames,
            // as well as adding custom items and separators. Update the toolbar here to ensure it reacts well to
            // deleted/renamed cameras etc.
            var toolbarMenu = rootVisualElement.Q<ToolbarMenu>(Names.kCurrentExecutionToolbarMenu);
            toolbarMenu.style.display = DisplayStyle.Flex;
            toolbarMenu.text = selectedExecutionItem?.name ?? "Camera";
            toolbarMenu.menu.ClearItems();
            toolbarMenu.menu.allowDuplicateNames = true;

            for (int i = 0; i < m_ExecutionItems.Count; i++)
            {
                var executionId = m_ExecutionItems[i];
                toolbarMenu.menu.AppendAction(executionId.name, OnExecutionMenuItemClicked, GetExecutionMenuItemStatus, userData: i);
            }

            // Store selected camera in EditorPrefs with a delay. This allows time for several cameras to appear
            // instead of immediately serializing the first one that is registered. Note that we reuse a single scheduler;
            // this enables consecutive updates to cancel any currently pending ones.
            m_StoreSelectedExecutionDelayed ??= toolbarMenu.schedule.Execute(() =>
            {
                if (selectedExecutionItem != null)
                    EditorPrefs.SetString(kSelectedExecutionEditorPrefsKey, selectedExecutionItem.name);
            });
            m_StoreSelectedExecutionDelayed.ExecuteLater(500);
        }

        void OnExecutionMenuItemClicked(DropdownMenuAction action)
        {
            int menuItemExecutionIndex = (int)action.userData;
            SetSelectedExecutionIndex(menuItemExecutionIndex);
        }

        DropdownMenuAction.Status GetExecutionMenuItemStatus(DropdownMenuAction action)
        {
            int menuItemExecutionIndex = (int)action.userData;
            return m_SelectedExecutionIndex == menuItemExecutionIndex ? DropdownMenuAction.Status.Checked : DropdownMenuAction.Status.Normal;
        }

        RenderGraph.DebugExecutionItem selectedExecutionItem
        {
            get
            {
                if (m_SelectedExecutionIndex != -1 && m_SelectedExecutionIndex < m_ExecutionItems.Count)
                    return m_ExecutionItems[m_SelectedExecutionIndex];
                return null;
            }
        }

        bool IsResourceVisible(RenderGraph.DebugData.ResourceData resource, RenderGraphResourceType type)
        {
            // Unused resources are always hidden
            if (resource.releasePassIndex == -1 && resource.creationPassIndex == -1)
                return false;

            if (!m_ResourceFilterEnabled)
                return true;
            
            if (resource.imported && !m_ResourceFilter.HasFlag(ResourceFilter.ImportedResources))
                return false;
            if (type == RenderGraphResourceType.Texture && !m_ResourceFilter.HasFlag(ResourceFilter.Textures))
                return false;
            if (type == RenderGraphResourceType.Buffer && !m_ResourceFilter.HasFlag(ResourceFilter.Buffers))
                return false;
            if (type == RenderGraphResourceType.AccelerationStructure &&
                !m_ResourceFilter.HasFlag(ResourceFilter.AccelerationStructures))
                return false;

            return true;
        }

        bool IsPassVisible(RenderGraph.DebugData.PassData pass)
        {
            if (!pass.generateDebugData)
                return false;

            if (!m_PassFilterEnabled)
                return true;

            if (m_CurrentDebugData.isNRPCompiler)
            {
                if (pass.culled && !m_PassFilter.HasFlag(PassFilter.CulledPasses))
                    return false;
                if (pass.type == RenderGraphPassType.Compute && !m_PassFilter.HasFlag(PassFilter.ComputePasses))
                    return false;
                if (pass.type == RenderGraphPassType.Raster && !m_PassFilter.HasFlag(PassFilter.RasterPasses))
                    return false;
                if (pass.type == RenderGraphPassType.Unsafe && !m_PassFilter.HasFlag(PassFilter.UnsafePasses))
                    return false;
            }
            else
            {
                if (pass.culled && !m_PassFilterLegacy.HasFlag(PassFilterLegacy.CulledPasses))
                    return false;
            }

            return true;
        }

        static readonly string[] k_ResourceNames =
            { "Texture Resource", "Buffer Resource", "Acceleration Structure Resource" };

        static readonly string[] k_MemorylessResourceNames =
            { "Memoryless Texture Resource", "Memoryless Buffer Resource", "Memoryless Acceleration Structure Resource" };


        // Pass title ellipsis must be generated manually because it can't be done right for rotated text using uss.
        void TruncatePassTitle(GeometryChangedEvent evt)
        {
            const int MaxPassTitleLenghtPx = 180;

            if (evt.target is Label label)
            {
                bool wasTruncated = false;
                while (true)
                {
                    var rect = label.MeasureTextSize(label.text, 0, VisualElement.MeasureMode.Undefined, 0,
                        VisualElement.MeasureMode.Undefined);

                    if (float.IsNaN(rect.x))
                        return; // layout not ready yet

                    var needsTruncate = rect.x > MaxPassTitleLenghtPx;
                    if (!needsTruncate)
                        break;

                    label.text = label.text.Remove(label.text.Length - 1, 1);
                    wasTruncated = true;
                }

                if (wasTruncated)
                    label.text += "...";
            }
        }

        /// <summary>
        /// Converts a physical file path (absolute or relative) to an AssetDatabase-compatible asset path.
        /// If the path does not point to a script under Assets or in a package, the path is returned as-is.
        /// </summary>
        /// <param name="physicalPath">The physical file path (absolute or relative) to convert.</param>
        /// <returns>An AssetDatabase-compatible asset path, or the untransformed string if the physical path
        /// could not be resolved to an asset path.</returns>
        /// <remarks>This method is internal for testing purposes only.</remarks>
        internal static string ScriptPathToAssetPath(string physicalPath)
        {
            // Make sure we have an absolute path with Unity separators, this is necessary for the following checks
            var absolutePath = System.IO.Path.GetFullPath(physicalPath).Replace(@"\", "/");

            // Project assets start with data path (in Editor: <project-path>/Assets)
            if (absolutePath.StartsWith(Application.dataPath, StringComparison.OrdinalIgnoreCase))
            {
                var assetPath = absolutePath.Replace(Application.dataPath, "Assets");
                return assetPath;
            }

            // Try to get the logical path mapped to this physical absolute path (for assets in a package)
            var logicalPath = FileUtil.GetLogicalPath(absolutePath);
            if (logicalPath != absolutePath)
            {
                return logicalPath;
            }

            // Asset path cannot be found - invalid script path
            return physicalPath;
        }

        UnityEngine.Object FindScriptAssetByScriptPath(string scriptPath)
        {
            var assetPath = ScriptPathToAssetPath(scriptPath);
            var asset = AssetDatabase.LoadAssetAtPath<UnityEngine.Object>(assetPath);
            if (asset == null)
                Debug.LogWarning($"Could not find a script asset to open for file path {scriptPath}");
            return asset;
        }

        VisualElement CreatePassListItem(int passId, RenderGraph.DebugData.PassData pass, int visiblePassIndex)
        {
            var passListItem = new VisualElement();
            passListItem.AddToClassList(Classes.kPassListItem);
            passListItem.pickingMode = PickingMode.Ignore;
            passListItem.style.left = visiblePassIndex * kPassWidthPx;

            var passTitle = new PassTitleLabel(pass.name);
            passTitle.tooltip = pass.name;
            passTitle.AddToClassList(Classes.kPassTitle);
            passTitle.RegisterCallback<GeometryChangedEvent>(TruncatePassTitle);
            passTitle.RegisterCallback<MouseOverEvent>(_ => HoverResourceGrid(visiblePassIndex, -1));
            passTitle.RegisterCallback<MouseOutEvent>(_ => HoverResourceGrid(-1, -1));
            passTitle.RegisterCallback<MouseMoveEvent>(_ => HoverResourceGrid(visiblePassIndex, -1));
            passTitle.RegisterCallback<ClickEvent>(evt => PassBlockClicked(evt, visiblePassIndex));
            passListItem.Add(passTitle);

            var passMergeIndicator = new VisualElement();
            passMergeIndicator.AddToClassList(Classes.kPassMergeIndicator);
            if (pass.nrpInfo?.nativePassInfo?.mergedPassIds?.Count > 1)
            {
                // Blue line do denote merged render passes
                passMergeIndicator.style.visibility = Visibility.Visible;

                bool firstMergedPass = pass.nrpInfo.nativePassInfo.mergedPassIds[0] == passId;
                bool lastMergedPass = pass.nrpInfo.nativePassInfo.mergedPassIds[^1] == passId;

                const int kBorderRadius = 2;
                const int kEdgeMargin = 2;

                // Use margins to create a break between consecutive merged passes
                int width = kPassWidthPx;
                if (firstMergedPass)
                {
                    passMergeIndicator.style.marginLeft = kEdgeMargin;
                    passMergeIndicator.style.borderTopLeftRadius = kBorderRadius;
                    passMergeIndicator.style.borderBottomLeftRadius = kBorderRadius;
                    width -= kEdgeMargin;
                }

                if (lastMergedPass)
                {
                    passMergeIndicator.style.marginRight = kEdgeMargin;
                    passMergeIndicator.style.borderTopRightRadius = kBorderRadius;
                    passMergeIndicator.style.borderBottomRightRadius = kBorderRadius;
                    width -= kEdgeMargin;
                }

                passMergeIndicator.style.width = width;
            }

            passListItem.Add(passMergeIndicator);

            var passBlock = new VisualElement();
            passBlock.AddToClassList(Classes.kPassBlock);
            passBlock.RegisterCallback<MouseEnterEvent>(_ =>
            {
                var scriptLinkBlock = new VisualElement();
                scriptLinkBlock.pickingMode = PickingMode.Ignore;
                scriptLinkBlock.AddToClassList(Classes.kPassBlock);
                scriptLinkBlock.AddToClassList(Classes.kPassBlockScriptLink);
                passBlock.Add(scriptLinkBlock);
            });
            passBlock.RegisterCallback<MouseLeaveEvent>(_ => passBlock.Clear());
            passBlock.RegisterCallback<ClickEvent>(evt =>
            {
                if (evt.button == 0)
                {
                    var scriptAsset = FindScriptAssetByScriptPath(pass.scriptInfo.filePath);
                    AssetDatabase.OpenAsset(scriptAsset, pass.scriptInfo.line);
                }
                evt.StopImmediatePropagation();
            });

            var passInfo = new PassElementInfo
            {
                passBlock = passBlock,
                passTitle = passTitle,
                passId = passId,
                isCulled = pass.culled,
                isAsync = pass.async
            };

            m_PassElementsInfo.Add(passInfo);
            passListItem.Add(passBlock);

            m_GridPassListTexts[passListItem] = new List<TextElement> { passTitle };

            return passListItem;
        }

        VisualElement CreatePassGridLine(int gridLineHeightPx, int offsetPx)
        {
            var gridline = new VisualElement();
            gridline.AddToClassList(Classes.kGridLine);
            gridline.style.left = offsetPx;
            gridline.style.height = gridLineHeightPx;
            gridline.pickingMode = PickingMode.Ignore;
            return gridline;
        }

        VisualElement CreateResourceTypeIcon(RenderGraphResourceType type, bool memoryless)
        {
            var resourceTypeIcon = new VisualElement();
            resourceTypeIcon.AddToClassList(Classes.kResourceIcon);
            string className = type switch
            {
                RenderGraphResourceType.Texture => memoryless ? Classes.kResourceIconMemorylessTexture : Classes.kResourceIconTexture,
                RenderGraphResourceType.Buffer => Classes.kResourceIconBuffer,
                RenderGraphResourceType.AccelerationStructure => Classes.kResourceIconAccelerationStructure,
                _ => throw new ArgumentOutOfRangeException(nameof(type))
            };
            resourceTypeIcon.AddToClassList(className);
            resourceTypeIcon.tooltip = memoryless ? k_MemorylessResourceNames[(int)type] : k_ResourceNames[(int)type];
            return resourceTypeIcon;
        }

        VisualElement CreateResourceListItem(RenderGraph.DebugData.ResourceData res, RenderGraphResourceType type)
        {
            var resourceListItem = new VisualElement();
            resourceListItem.AddToClassList(Classes.kResourceListItem);

            var resourceTitleContainer = new VisualElement();
            resourceTitleContainer.Add(CreateResourceTypeIcon(type, res.memoryless));

            var resourceLabel = new Label();
            resourceLabel.text = res.name;
            resourceLabel.tooltip = res.name;
            resourceTitleContainer.Add(resourceLabel);

            var iconContainer = new VisualElement();
            iconContainer.AddToClassList(Classes.kResourceIconContainer);

            var importedIcon = new VisualElement();
            importedIcon.AddToClassList(Classes.kResourceIcon);
            importedIcon.AddToClassList(Classes.kResourceIconImported);
            importedIcon.tooltip = "Imported resource";
            importedIcon.style.visibility = res.imported ? Visibility.Visible : Visibility.Hidden;
            iconContainer.Add(importedIcon);

            int numIcons = 1 + iconContainer.childCount;
            resourceLabel.style.maxWidth = kResourceColumnWidth - numIcons * kResourceIconSize - 4;

            resourceListItem.Add(resourceTitleContainer);
            resourceListItem.Add(iconContainer);

            m_GridResourceListTexts[resourceListItem] = new List<TextElement> { resourceLabel };

            return resourceListItem;
        }

        int FindNextVisiblePassIndex(int passId)
        {
            while (passId < m_CurrentDebugData.passList.Count)
            {
                if (m_PassIdToVisiblePassIndex.TryGetValue(passId, out int visiblePassIndex))
                    return visiblePassIndex;
                passId++;
            }

            return -1;
        }

        void CreateRWResourceBlockElement(int offsetPx, ResourceRWBlock block)
        {
            string accessType = null;
            if (block.read && block.write)
            {
                var triangle = new TriangleElement();
                triangle.width = kDependencyBlockWidthPx;
                triangle.height = kDependencyBlockHeightPx;
                triangle.color = EditorGUIUtility.isProSkin ? kReadWriteBlockFillColorDark : kReadWriteBlockFillColorLight;
                block.element = triangle;
                block.element.AddToClassList(Classes.kResourceDependencyBlockReadWrite);
                accessType = "Read/write";
            }
            else
            {
                block.element = new VisualElement();
                if (block.read)
                {
                    block.element.AddToClassList(Classes.kResourceDependencyBlockRead);
                    accessType = "Read";
                }
                else if (block.write)
                {
                    block.element.AddToClassList(Classes.kResourceDependencyBlockWrite);
                    accessType = "Write";
                }
            }

            string tooltip = string.Empty;
            if (!string.IsNullOrEmpty(accessType))
                tooltip += $"<b>{accessType}</b> access to this resource.";

            if (block.load != ResourceRWBlock.LoadAction.None)
            {
                if (tooltip.Length > 0)
                    tooltip += "<br>";

                tooltip += $"Load Action: <b>{kLoadActionNames[(int)block.load]}</b>";
            }

            if (block.store != ResourceRWBlock.StoreAction.None)
            {
                if (tooltip.Length > 0)
                    tooltip += "<br>";

                tooltip += $"Store Action: <b>{kStoreActionNames[(int)block.store]}</b>";
            }

            if (block.usage != ResourceRWBlock.UsageFlags.None)
            {
                string resourceIconClassName = string.Empty;

                if (block.HasMultipleUsageFlags())
                    resourceIconClassName = Classes.kResourceIconMultipleUsage;
                else if (block.usage.HasFlag(ResourceRWBlock.UsageFlags.FramebufferFetch))
                    resourceIconClassName = Classes.kResourceIconFbfetch;
                else if (block.usage.HasFlag(ResourceRWBlock.UsageFlags.UpdatesGlobalResource))
                    resourceIconClassName = block.read || block.write ? Classes.kResourceIconGlobalLight : Classes.kResourceIconGlobalDark;

                if (!string.IsNullOrEmpty(resourceIconClassName))
                {
                    var usageIcon = new VisualElement();
                    usageIcon.AddToClassList(Classes.kResourceIcon);
                    usageIcon.AddToClassList(resourceIconClassName);
                    block.element.Add(usageIcon);
                }

                if (tooltip.Length > 0)
                    tooltip += "<br><br>";
                tooltip += "Usage details:";
                if (block.usage.HasFlag(ResourceRWBlock.UsageFlags.FramebufferFetch))
                    tooltip += "<br>- Read is using <b>framebuffer fetch</b>.";
                if (block.usage.HasFlag(ResourceRWBlock.UsageFlags.UpdatesGlobalResource))
                    tooltip += "<br>- Updates a global resource slot.";
                if (block.memoryless)
                    tooltip += "<br>- Memory usage is <b>memoryless</b>.";
            }

            if (m_ViewOptionsEnabled && m_ViewOptions.HasFlag(ViewOptions.LoadStoreActions))
            {
                if (block.load != ResourceRWBlock.LoadAction.None)
                {
                    var loadActionBorder = new TriangleElement { useStyle = true };
                    loadActionBorder.AddToClassList(Classes.kLoadAction);
                    loadActionBorder.AddToClassList(Classes.kLoadActionBorder);

                    var loadAction = new TriangleElement { useStyle = true };
                    loadAction.AddToClassList(Classes.kLoadAction);

                    switch (block.load)
                    {
                        case ResourceRWBlock.LoadAction.Load:
                            loadAction.AddToClassList(Classes.kLoadActionLoad);
                            break;
                        case ResourceRWBlock.LoadAction.Clear:
                            loadAction.AddToClassList(Classes.kLoadActionClear);
                            break;
                        case ResourceRWBlock.LoadAction.DontCare:
                            loadAction.AddToClassList(Classes.kLoadActionDontCare);
                            break;
                    }

                    block.element.Add(loadActionBorder);
                    block.element.Add(loadAction);
                }

                if( block.store != ResourceRWBlock.StoreAction.None)
                {
                    var storeActionBorder = new TriangleElement { useStyle = true };
                    storeActionBorder.AddToClassList(Classes.kStoreAction);
                    storeActionBorder.AddToClassList(Classes.kStoreActionBorder);

                    var storeAction = new TriangleElement { useStyle = true };
                    storeAction.AddToClassList(Classes.kStoreAction);

                    switch (block.store)
                    {
                        case ResourceRWBlock.StoreAction.Store:
                            storeAction.AddToClassList(Classes.kStoreActionStore);
                            break;
                        case ResourceRWBlock.StoreAction.Resolve:
                            storeAction.AddToClassList(Classes.kStoreActionResolve);
                            break;
                        case ResourceRWBlock.StoreAction.StoreAndResolve:
                            storeAction.AddToClassList(Classes.kStoreActionStoreAndResolve);
                            break;
                        case ResourceRWBlock.StoreAction.DontCare:
                            storeAction.AddToClassList(Classes.kStoreActionDontCare);
                            break;
                    }

                    block.element.Add(storeActionBorder);
                    block.element.Add(storeAction);
                }
            }

            block.tooltip = tooltip;
            block.element.style.left = offsetPx;
            block.element.AddToClassList(Classes.kResourceDependencyBlock);
        }

        VisualElement CreateResourceGridRow(
            RenderGraph.DebugData.ResourceData res,
            RenderGraphResourceType resourceType,
            int resourceIndex,
            ResourceElementInfo elementInfo,
            int visibleResourceIndex)
        {
            var row = new VisualElement();
            row.pickingMode = PickingMode.Ignore;
            row.AddToClassList(Classes.kResourceGridRow);

            // Dashed line connecting resource to first usage
            int firstVisiblePassUsingResource = FindNextVisiblePassIndex(res.creationPassIndex);
            if (firstVisiblePassUsingResource == -1)
            {
                return row; // Early out - no pass uses the resource
            }

            int firstUsePassOffsetPx = firstVisiblePassUsingResource * kPassWidthPx;
            const int resourceHelperLineMargin = 4;
            var resourceHelperLine = new VisualElement();
            resourceHelperLine.AddToClassList(Classes.kResourceHelperLine);
            resourceHelperLine.style.marginLeft = resourceHelperLineMargin;
            resourceHelperLine.style.width = firstUsePassOffsetPx - 2 * resourceHelperLineMargin;
            resourceHelperLine.pickingMode = PickingMode.Ignore;
            row.Add(resourceHelperLine);
            elementInfo.resourceHelperLine = resourceHelperLine;

            // Wide gray block indicating first <-> last use range
            var usageRangeBlock = new VisualElement();
            usageRangeBlock.AddToClassList(Classes.kResourceUsageRangeBlock);

            int passIdAfterLastUse = res.releasePassIndex + 1;
            int visiblePassAfterLastUse = FindNextVisiblePassIndex(passIdAfterLastUse);
            if (visiblePassAfterLastUse == -1)
                visiblePassAfterLastUse = m_PassElementsInfo.Count; // last pass uses resource

            int numVisiblePassesUsed = visiblePassAfterLastUse - firstVisiblePassUsingResource;

            usageRangeBlock.style.position = Position.Absolute;
            usageRangeBlock.style.left = firstUsePassOffsetPx;
            usageRangeBlock.style.width = numVisiblePassesUsed * kPassWidthPx;
            row.Add(usageRangeBlock);
            elementInfo.usageRangeBlock = usageRangeBlock;

            // Read/write/read-write blocks
            List<ResourceRWBlock> blocks = new(m_CurrentDebugData.passList.Count);
            for (int passId = 0; passId < m_CurrentDebugData.passList.Count; passId++)
                blocks.Add(new ResourceRWBlock());

            foreach (int readPassId in res.consumerList)
                blocks[readPassId].read = true;

            foreach (var writePassId in res.producerList)
                blocks[writePassId].write = true;

            var currentResource = m_CurrentDebugData.resourceLists[(int)resourceType][resourceIndex];
            HashSet<RenderGraph.DebugData.PassData.NRPInfo.NativeRenderPassInfo> uniqueRenderPassInfos = new();

            // Build pass blocks
            for (int passId = 0; passId < blocks.Count; passId++)
            {
                ResourceRWBlock block = blocks[passId];
                var pass = m_CurrentDebugData.passList[passId];
                if (resourceType == RenderGraphResourceType.Texture && pass.nrpInfo != null)
                {
                    if (pass.nrpInfo.textureFBFetchList.Contains(resourceIndex))
                        block.usage |= ResourceRWBlock.UsageFlags.FramebufferFetch;
                    if (pass.nrpInfo.setGlobals.Contains(resourceIndex))
                        block.usage |= ResourceRWBlock.UsageFlags.UpdatesGlobalResource;
                    if (pass.nrpInfo.nativePassInfo != null)
                    {
                        uniqueRenderPassInfos.Add(pass.nrpInfo.nativePassInfo);

                        foreach (var attachmentInfo in pass.nrpInfo.nativePassInfo.attachmentInfos)
                        {
                            if (attachmentInfo.resourceName == currentResource.name)
                            {
                                block.memoryless = attachmentInfo.attachment.memoryless;

                                block.load = attachmentInfo.attachment.loadAction switch
                                {
                                    RenderBufferLoadAction.Load => ResourceRWBlock.LoadAction.Load,
                                    RenderBufferLoadAction.Clear => ResourceRWBlock.LoadAction.Clear,
                                    RenderBufferLoadAction.DontCare => ResourceRWBlock.LoadAction.DontCare,
                                    _ => ResourceRWBlock.LoadAction.None
                                };

                                block.store = attachmentInfo.attachment.storeAction switch
                                {
                                    RenderBufferStoreAction.Store => ResourceRWBlock.StoreAction.Store,
                                    RenderBufferStoreAction.Resolve => ResourceRWBlock.StoreAction.Resolve,
                                    RenderBufferStoreAction.StoreAndResolve => ResourceRWBlock.StoreAction.StoreAndResolve,
                                    RenderBufferStoreAction.DontCare => ResourceRWBlock.StoreAction.DontCare,
                                    _ => ResourceRWBlock.StoreAction.None,
                                };
                                break;
                            }
                        }
                    }
                }
            }

            // Adjust blocks to only show first load/store actions for each merged native render pass
            foreach (var nrpInfo in uniqueRenderPassInfos)
            {
                int minLoadPass = int.MaxValue;
                int maxStorePass = int.MinValue;

                // Find the first and last load/store pair
                foreach (int mergedPassId in nrpInfo.mergedPassIds)
                {
                    var mergedPass = m_CurrentDebugData.passList[mergedPassId];
                    foreach (var attachmentInfo in mergedPass.nrpInfo.nativePassInfo.attachmentInfos)
                    {
                        bool read = mergedPass.resourceReadLists[(int)resourceType].Contains(resourceIndex);
                        bool write = mergedPass.resourceWriteLists[(int)resourceType].Contains(resourceIndex);
                        if (attachmentInfo.resourceName == currentResource.name && (read || write))
                        {
                            minLoadPass = Mathf.Min(minLoadPass, mergedPassId);
                            maxStorePass = Mathf.Max(maxStorePass, mergedPassId);
                        }
                    }
                }

                // Remove load/store actions between the first load and last store pass
                if (minLoadPass < maxStorePass)
                {
                    blocks[minLoadPass].store = ResourceRWBlock.StoreAction.None;

                    for (int i = minLoadPass + 1, imax = maxStorePass; i < imax; ++i)
                    {
                        var block = blocks[i];
                        block.load = ResourceRWBlock.LoadAction.None;
                        block.store = ResourceRWBlock.StoreAction.None;
                    }

                    blocks[maxStorePass].load = ResourceRWBlock.LoadAction.None;
                }
            }

            // Add blocks that are visible
            for (int passId = 0; passId < blocks.Count; passId++)
            {
                ResourceRWBlock block = blocks[passId];
                if (m_PassIdToVisiblePassIndex.TryGetValue(passId, out int visiblePassIndex))
                {
                    if (!block.read && !block.write && block.usage == ResourceRWBlock.UsageFlags.None)
                        continue; // No need to create a visual element

                    int offsetPx = visiblePassIndex * kPassWidthPx;
                    CreateRWResourceBlockElement(offsetPx, block);
                    block.visibleResourceIndex = visibleResourceIndex;
                    row.Add(block.element);
                    m_PassElementsInfo[visiblePassIndex].resourceBlocks.Add(block);
                }
            }

            return row;
        }

        void ClearGraphViewerUI()
        {
            rootVisualElement.Q<VisualElement>(Names.kGridlineContainer)?.Clear();
            rootVisualElement.Q<VisualElement>(Names.kPassList)?.Clear();
            rootVisualElement.Q<VisualElement>(Names.kResourceListScrollView)?.Clear();
            rootVisualElement.Q<VisualElement>(Names.kResourceGrid)?.Clear();

            m_PassElementsInfo.Clear();
            m_ResourceElementsInfo.Clear();
            m_PassIdToVisiblePassIndex.Clear();
            m_VisiblePassIndexToPassId.Clear();
            m_CurrentSelectedVisiblePassIndex = -1;
            m_CurrentHoveredVisibleResourceIndex = -1;
            m_CurrentHoveredVisiblePassIndex = -1;

            ClearPassHighlight();
            ClearResourceHighlight();
        }

        void RebuildGraphViewerUI()
        {
            if (rootVisualElement?.childCount == 0 || RenderGraphDebugSession.currentDebugSession == null)
                return;

            ClearGraphViewerUI();
            ClearEmptyStateMessage();

            if (RenderGraphDebugSession.GetRegisteredGraphs().Count == 0)
            {
                SetEmptyStateMessage(EmptyStateReason.NoGraphRegistered);
                return;
            }

            if (!HasValidDebugData)
            {
                SetEmptyStateMessage(EmptyStateReason.WaitingForCameraRender);
                return;
            }

            // Pass list
            m_GridPassListTexts.Clear();
            var passList = rootVisualElement.Q<VisualElement>(Names.kPassList);
            int visiblePassIndex = 0;
            for (int passId = 0; passId < m_CurrentDebugData.passList.Count; passId++)
            {
                var pass = m_CurrentDebugData.passList[passId];
                if (!IsPassVisible(pass))
                    continue;

                passList.Add(CreatePassListItem(passId, pass, visiblePassIndex));
                m_PassIdToVisiblePassIndex.Add(passId, visiblePassIndex);
                m_VisiblePassIndexToPassId.Add(visiblePassIndex, passId);
                visiblePassIndex++;
            }

            int numVisiblePasses = visiblePassIndex;
            if (numVisiblePasses == 0)
            {
                SaveSplitViewFixedPaneHeight();
                ClearGraphViewerUI();
                SetEmptyStateMessage(EmptyStateReason.EmptyPassFilterResult);
                return;
            }

            ResetPassBlockState();

            // Resource list & grid
            m_GridResourceListTexts.Clear();
            var resourceListScrollView = rootVisualElement.Q<ScrollView>(Names.kResourceListScrollView);
            var resourceGrid = rootVisualElement.Q<VisualElement>(Names.kResourceGrid);
            resourceGrid.style.width = numVisiblePasses * kPassWidthPx + kPassTitleAllowanceMargin;

            int visibleResourceIndex = 0;
            for (int t = 0; t < (int) RenderGraphResourceType.Count; t++)
            {
                var resourceType = (RenderGraphResourceType) t;
                var resourceList = m_CurrentDebugData.resourceLists[t];
                for (int resourceIndex = 0; resourceIndex < resourceList.Count; resourceIndex++)
                {
                    var res = resourceList[resourceIndex];
                    if (!IsResourceVisible(res, resourceType))
                        continue;

                    var elementInfo = new ResourceElementInfo
                    {
                        type = resourceType,
                        index = resourceIndex,
                        firstPassId = res.creationPassIndex,
                        lastPassId = res.releasePassIndex
                    };
                    elementInfo.resourceListItem = CreateResourceListItem(res, resourceType);
                    resourceListScrollView.Add(elementInfo.resourceListItem);
                    resourceGrid.Add(CreateResourceGridRow(res, resourceType, resourceIndex,
                        elementInfo, visibleResourceIndex));
                    m_ResourceElementsInfo.Add(elementInfo);

                    visibleResourceIndex++;
                }
            }

            int numVisibleResources = visibleResourceIndex;
            if (numVisibleResources == 0)
            {
                SaveSplitViewFixedPaneHeight();
                ClearGraphViewerUI();
                SetEmptyStateMessage(EmptyStateReason.EmptyResourceFilterResult);
                return;
            }

            // Add a padding item to ensure horizontal scrollbar doesn't cause the listviews to get out of sync
            var resourcePaddingItem = new VisualElement();
            resourcePaddingItem.AddToClassList(Classes.kResourceListPaddingItem);
            resourceListScrollView.Add(resourcePaddingItem);

            // Grid lines
            int gridLineHeightPx = numVisibleResources * kResourceRowHeightPx + kResourceGridMarginTopPx;
            int gridLineOffsetPx = 0;
            var gridlineContainer = rootVisualElement.Q<VisualElement>(Names.kGridlineContainer);
            for (int passIndex = 0; passIndex < numVisiblePasses; passIndex++)
            {
                var gridLine = CreatePassGridLine(gridLineHeightPx, gridLineOffsetPx);
                gridlineContainer.Add(gridLine);
                gridLineOffsetPx += kPassWidthPx;
                m_PassElementsInfo[passIndex].leftGridLine = gridLine;
            }

            gridlineContainer.Add(CreatePassGridLine(gridLineHeightPx, gridLineOffsetPx));

            // Hover overlay element
            var hoverOverlay = rootVisualElement.Q(Names.kHoverOverlay);
            hoverOverlay.style.marginTop = kResourceGridMarginTopPx;
            hoverOverlay.style.width = gridLineOffsetPx;
            hoverOverlay.style.height = gridLineHeightPx;
            hoverOverlay.focusable = true;

            // Side panel
            PopulateResourceList();
            PopulatePassList();
        }

        void RerouteWheelEvent(VisualElement source, VisualElement target)
        {
            source.RegisterCallback<WheelEvent>(evt =>
            {
                evt.StopImmediatePropagation();

                // Need to create an intermediate Event to be able to call WheelEvent.GetPooled()
                var imguiEvt = new Event {
                    type = EventType.ScrollWheel,
                    delta = new Vector2(evt.delta.x, evt.delta.y),
                    mousePosition = evt.mousePosition,
                    modifiers = evt.modifiers
                };
                using (var newEvt = WheelEvent.GetPooled(imguiEvt))
                {
                    newEvt.target = target;
                    target.SendEvent(newEvt);
                }
            }, TrickleDown.TrickleDown);
        }

        // Initialize, register callbacks & manipulators etc. once
        void InitializeUI()
        {
            rootVisualElement.Clear();

            var visualTreeAsset = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>(k_TemplatePath);
            visualTreeAsset.CloneTree(rootVisualElement);

            var themeStyleSheet =
                AssetDatabase.LoadAssetAtPath<StyleSheet>(EditorGUIUtility.isProSkin
                    ? k_DarkStylePath
                    : k_LightStylePath);
            rootVisualElement.styleSheets.Add(themeStyleSheet);

            // Hover overlay
            var hoverOverlay = rootVisualElement.Q(Names.kHoverOverlay);
            hoverOverlay.RegisterCallback<MouseOverEvent>(_ => HoverResourceGrid(-1, -1));
            hoverOverlay.RegisterCallback<MouseOutEvent>(_ => HoverResourceGrid(-1, -1));
            hoverOverlay.RegisterCallback<MouseMoveEvent>(ResourceGridHovered);
            hoverOverlay.RegisterCallback<ClickEvent>(ResourceGridClicked);
            hoverOverlay.RegisterCallback<TooltipEvent>(ResourceGridTooltipDisplayed, TrickleDown.TrickleDown);
            hoverOverlay.RegisterCallback<KeyUpEvent>(KeyPressed);

            rootVisualElement.Q(Names.kMainContainer).RegisterCallback<ClickEvent>(_ => DeselectPass());

            // Resource grid manipulation
            var resourceListScrollView = rootVisualElement.Q<ScrollView>(Names.kResourceListScrollView);
            var passListScrollView = rootVisualElement.Q<ScrollView>(Names.kPassListScrollView);
            var resourceGridScrollView = rootVisualElement.Q<ScrollView>(Names.kResourceGridScrollView);
            m_PanManipulator = new PanManipulator(this);
            resourceGridScrollView.AddManipulator(m_PanManipulator);
            resourceGridScrollView.mode = ScrollViewMode.VerticalAndHorizontal;

            // Sync resource grid scrollbar state to resource list and pass list scrollbars
            resourceListScrollView.verticalScrollerVisibility = ScrollerVisibility.Hidden;
            resourceListScrollView.horizontalScrollerVisibility = ScrollerVisibility.Hidden;
            resourceGridScrollView.verticalScroller.valueChanged += value =>
                resourceListScrollView.scrollOffset = new Vector2(resourceGridScrollView.scrollOffset.x, value);

            passListScrollView.verticalScrollerVisibility = ScrollerVisibility.Hidden;
            passListScrollView.horizontalScrollerVisibility = ScrollerVisibility.Hidden;
            resourceGridScrollView.horizontalScroller.valueChanged += value =>
                passListScrollView.scrollOffset = new Vector2(value, passListScrollView.scrollOffset.y);

            // Scroll views are synced to the resource grid, so we don't want them to scroll independently. To have
            // consistent behavior, redirect the wheel events to the resource grid and let it handle them.
            RerouteWheelEvent(resourceListScrollView, resourceGridScrollView);
            RerouteWheelEvent(passListScrollView, resourceGridScrollView);
            var passListCornerOccluder = rootVisualElement.Q<VisualElement>(Names.kPassListCornerOccluder);
            RerouteWheelEvent(passListCornerOccluder, resourceGridScrollView);

            InitializeSidePanel();
        }

        void OnRegisteredGraphsChanged()
        {
           OnRegisteredGraphsChangedInternal();
        }

        void OnRegisteredGraphsChangedInternal(bool force = false)
        {
            m_SelectedExecutionIndex = -1;
            UpdateSelectedGraphAndExecution();
            UpdateCurrentDebugData(force);
        }

        void OnDebugDataUpdated(string graph, EntityId executionId)
        {
            if (executionId == EntityId.None)
            {
                m_RefreshUIDelayed.Pause(); // Cancel pending refreshes because state is invalid
                ClearGraphViewerUI();
                SetEmptyStateMessage(EmptyStateReason.IncompatibleDataReceived);
                return;
            }

            UpdateSelectedGraphAndExecution();
            if (m_SelectedRenderGraph == graph && selectedExecutionItem != null && selectedExecutionItem.id == executionId)
            {
                UpdateCurrentDebugData();
            }
        }

        void UpdateStatusLabel()
        {
            var statusLabel = rootVisualElement.Q<Label>(Names.kStatusLabel);
            var footerContainer = rootVisualElement.Q<VisualElement>("footer-container");

            if (statusLabel == null || footerContainer == null)
                return;

            footerContainer.style.display = m_Paused ? DisplayStyle.Flex : DisplayStyle.None;

            if (!m_Paused)
                return;

            string connectionStatus = m_IsDeviceConnected ? "Online" : "Offline";

            bool isEditor = m_ConnectedDeviceName == "Editor";
            string sourceLabel = isEditor ? "Source: Editor" : $"Source: {m_ConnectedDeviceName} ({connectionStatus})";

            bool hasCapture = HasValidDebugData && m_LastDataCaptureTime != DateTime.MinValue;
            string captureLabel = hasCapture ? $"Captured: {m_LastDataCaptureTime:HH:mm:ss}" : "No data captured";

            string statusText = $"{sourceLabel} | {captureLabel}";

            statusLabel.text = statusText;
        }

        void UpdateCurrentDebugData(bool force = false)
        {
            if (m_Paused && !force)
                return; // Don't update data when paused except for if we force the update

            if (selectedExecutionItem != null)
            {
                m_CurrentDebugData = RenderGraphDebugSession.GetDebugData(m_SelectedRenderGraph, selectedExecutionItem.id);

                if (HasValidDebugData)
                    m_LastDataCaptureTime = DateTime.Now;
            }
            else
            {
                m_CurrentDebugData = null;

                var currentGraphDropdown = rootVisualElement.Q<DropdownField>(Names.kCurrentGraphDropdown);
                var currentExecutionToolbarMenu = rootVisualElement.Q<ToolbarMenu>(Names.kCurrentExecutionToolbarMenu);

                if (currentGraphDropdown != null)
                    currentGraphDropdown.style.display = DisplayStyle.None;
                if (currentExecutionToolbarMenu != null)
                    currentExecutionToolbarMenu.style.display = DisplayStyle.None;
            }

            UpdateStatusLabel();

            // Refresh delayed. That way we don't break rendering if something goes wrong on the UI layer.
            m_RefreshUIDelayed ??= rootVisualElement.schedule.Execute(DelayedRefresh);
            m_RefreshUIDelayed.ExecuteLater(1);
        }

        void DelayedRefresh()
        {
            RebuildPassFilterUI();
            RebuildResourceFilterUI();
            RebuildViewOptionsUI();
            RebuildGraphViewerUI();
            RebuildAutoPlayUI();
            UpdateStatusLabel();
        }

        void CreateGUI()
        {
            s_EditorWindowInstanceId = GetInstanceID();

            if (EditorPrefs.HasKey(kPassFilterLegacyEditorPrefsKey))
                m_PassFilterLegacy = (PassFilterLegacy)EditorPrefs.GetInt(kPassFilterLegacyEditorPrefsKey);
            if (EditorPrefs.HasKey(kPassFilterEditorPrefsKey))
                m_PassFilter = (PassFilter)EditorPrefs.GetInt(kPassFilterEditorPrefsKey);
            if (EditorPrefs.HasKey(kResourceFilterEditorPrefsKey))
                m_ResourceFilter = (ResourceFilter)EditorPrefs.GetInt(kResourceFilterEditorPrefsKey);
            if (EditorPrefs.HasKey(kViewOptionsEditorPrefsKey))
                m_ViewOptions = (ViewOptions)EditorPrefs.GetInt(kViewOptionsEditorPrefsKey);

            m_PassFilterEnabled = GetFilterEnabledState(kPassFilterEditorPrefsKey, true);
            m_ResourceFilterEnabled = GetFilterEnabledState(kResourceFilterEditorPrefsKey, true);
            m_ViewOptionsEnabled = GetFilterEnabledState(kViewOptionsEditorPrefsKey, false);

            GraphicsToolLifetimeAnalytic.WindowOpened<RenderGraphViewer>();

            m_ResourceListIcon = AssetDatabase.LoadAssetAtPath<Texture2D>(string.Format(k_ResourceListIconPath, EditorGUIUtility.isProSkin ? "d_" : ""));
            m_PassListIcon = AssetDatabase.LoadAssetAtPath<Texture2D>(string.Format(k_PassListIconPath, EditorGUIUtility.isProSkin ? "d_" : ""));

            InitializeUI();

            if (m_PlayerConnection == null)
            {
                var connectionState = PlayerConnectionGUIUtility.GetConnectionState(this);
                m_PlayerConnection = new PlayerConnection(connectionState, OnPlayerConnected, OnPlayerDisconnected);

                // Initialize device connection state right here while we have it
                if (!string.IsNullOrEmpty(connectionState.connectionName))
                {
                    m_ConnectedDeviceName = connectionState.connectionName;
                    m_IsDeviceConnected = true;
                }
                else
                {
                    m_ConnectedDeviceName = k_EditorName;
                    m_IsDeviceConnected = true;
                }

                connectionState.Dispose(); // Dispose it immediately after use
            }

            var connectionDropdown = rootVisualElement.Q<IMGUIContainer>(Names.kConnectionDropdown);
            connectionDropdown.onGUIHandler = m_PlayerConnection.OnConnectionDropdownIMGUI;

            if (RenderGraphDebugSession.currentDebugSession == null)
                ConnectDebugSession<RenderGraphEditorLocalDebugSession>();
            UpdateStatusLabel();
        }

        void OnDisable()
        {
            // NOTE: This is a workaround to deal with how Unity handles Maximize/Minimize. When the window gets
            // maximized, seemingly nothing happens. When it gets unmaximized, both OnEnable() and OnDisable() get called
            // on a new EditorWindow instance, which I guess was the maximized one? Anyway we need to ignore this event
            // because the DebugSession is static and we don't want to unsubscribe because the window is still open.
            if (s_EditorWindowInstanceId != GetInstanceID())
                return;

            m_CurrentDebugData?.Clear();
            DisconnectDebugSession();

            m_PlayerConnection?.Dispose();

            GraphicsToolLifetimeAnalytic.WindowClosed<RenderGraphViewer>();
        }

        void OnPlayerConnected(int playerID)
        {
            // Get device name fresh when needed
            using (var connectionState = PlayerConnectionGUIUtility.GetConnectionState(this))
            {
                m_ConnectedDeviceName = connectionState?.connectionName ?? $"Remote Device {playerID}";
            }
            m_IsDeviceConnected = true;


            ConnectDebugSession<RenderGraphEditorRemoteDebugSession>();
        }

        void OnPlayerDisconnected(int playerID)
        {
            m_IsDeviceConnected = false;

            if (!m_Paused)
            {
                var autoPlayToggle = rootVisualElement.Q<ToolbarToggle>(Names.kAutoPauseToggle);
                if (autoPlayToggle != null)
                {
                    autoPlayToggle.value = true;
                }
            }

            if (!m_Paused)
            {
                ConnectDebugSession<RenderGraphEditorLocalDebugSession>();
            }
            else
            {
                UpdateStatusLabel();
            }
        }

        internal void ConnectDebugSession<TSession>()
            where TSession : RenderGraphDebugSession, new()
        {
            if (typeof(TSession) == typeof(RenderGraphEditorLocalDebugSession))
            {
                if (m_ConnectedDeviceName == "Unknown" || m_ConnectedDeviceName == k_EditorName)
                {
                    m_ConnectedDeviceName = k_EditorName;
                    m_IsDeviceConnected = true;
                }
            }

            //If we are paused, we need to force update the current debug data once to ensure that the UI is up to date when the
            //connection changes
            if (m_Paused)
                OnRegisteredGraphsChangedInternal(true);

            if (RenderGraphDebugSession.currentDebugSession?.GetType() == typeof(TSession))
                return;

            DisconnectDebugSession();

            RenderGraphDebugSession.Create<TSession>();
            RenderGraphDebugSession.onRegisteredGraphsChanged += OnRegisteredGraphsChanged;
            RenderGraphDebugSession.onDebugDataUpdated += OnDebugDataUpdated;

            OnRegisteredGraphsChanged();
        }

        void DisconnectDebugSession()
        {
            if (RenderGraphDebugSession.currentDebugSession == null)
                return;

            RenderGraphDebugSession.EndSession();
            RenderGraphDebugSession.onRegisteredGraphsChanged -= OnRegisteredGraphsChanged;
            RenderGraphDebugSession.onDebugDataUpdated -= OnDebugDataUpdated;

            m_IsDeviceConnected = false;
            UpdateStatusLabel();

            ClearGraphViewerUI();
        }
    }

    [UxmlElement]
    internal partial class TriangleElement : VisualElement
    {
        public int width { get; set; }

        public int height { get; set; }

        public Color color { get; set; }

        public bool useStyle { get; set; }

        public TriangleElement()
        {
            generateVisualContent += ctx =>
            {
                var painter = ctx.painter2D;
                var resolvedStyle = ctx.visualElement.resolvedStyle;
                var color = useStyle ? resolvedStyle.color : this.color;
                var width = useStyle ? resolvedStyle.width : this.width;
                var height = useStyle ? resolvedStyle.height : this.height;

                painter.fillColor = color;
                painter.BeginPath();
                painter.MoveTo(new Vector2(0, height));
                painter.LineTo(new Vector2(0, 0));
                painter.LineTo(new Vector2(width, 0));
                painter.ClosePath();
                painter.Fill();
            };
        }
    }
}