using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Runtime.InteropServices;
using UnityEditor.Rendering.Analytics;
using UnityEditor.UIElements;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.HighDefinition;
using UnityEngine.UIElements;

namespace UnityEditor.Rendering.HighDefinition
{
    partial class HDWizard : EditorWindowWithHelpButton
    {
        #region OBJECT_SELECTOR

        //utility class to show only non scene object selection
        static class ObjectSelector
        {
            static Action<UnityEngine.Object, Type, Action<UnityEngine.Object>> ShowObjectSelector;
            static Func<UnityEngine.Object> GetCurrentObject;
            static Func<int> GetSelectorID;
            static Action<int> SetSelectorID;

            const string ObjectSelectorUpdatedCommand = "ObjectSelectorUpdated";

            static int id;

            static int selectorID { get => GetSelectorID(); set => SetSelectorID(value); }

            public static bool opened
                => Resources.FindObjectsOfTypeAll(typeof(PlayerSettings).Assembly.GetType("UnityEditor.ObjectSelector")).Length > 0;

            // Action to be called with the window is closed
            static Action s_OnClose;

            static ObjectSelector()
            {
                Type playerSettingsType = typeof(PlayerSettings);
                Type objectSelectorType = playerSettingsType.Assembly.GetType("UnityEditor.ObjectSelector");
                var instanceObjectSelectorInfo = objectSelectorType.GetProperty("get", BindingFlags.Static | BindingFlags.Public);
#if UNITY_2022_2_OR_NEWER
                var showInfo = objectSelectorType.GetMethod("Show", BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { typeof(UnityEngine.Object), typeof(Type), typeof(UnityEngine.Object), typeof(bool), typeof(List<int>), typeof(Action<UnityEngine.Object>), typeof(Action<UnityEngine.Object>), typeof(bool) }, null);
#elif UNITY_2020_1_OR_NEWER
                var showInfo = objectSelectorType.GetMethod("Show", BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { typeof(UnityEngine.Object), typeof(Type), typeof(UnityEngine.Object), typeof(bool), typeof(List<int>), typeof(Action<UnityEngine.Object>), typeof(Action<UnityEngine.Object>) }, null);
#else
                var showInfo = objectSelectorType.GetMethod("Show", BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { typeof(UnityEngine.Object), typeof(Type), typeof(SerializedProperty), typeof(bool), typeof(List<int>), typeof(Action<UnityEngine.Object>), typeof(Action<UnityEngine.Object>) }, null);
#endif
                var objectSelectorVariable = Expression.Variable(objectSelectorType, "objectSelector");
                var objectParameter = Expression.Parameter(typeof(UnityEngine.Object), "unityObject");
                var typeParameter = Expression.Parameter(typeof(Type), "type");
                var onClosedParameter = Expression.Parameter(typeof(Action<UnityEngine.Object>), "onClosed");
                var onChangedObjectParameter = Expression.Parameter(typeof(Action<UnityEngine.Object>), "onChangedObject");
                var showObjectSelectorBlock = Expression.Block(
                    new[] { objectSelectorVariable },
                    Expression.Assign(objectSelectorVariable, Expression.Call(null, instanceObjectSelectorInfo.GetGetMethod())),
#if UNITY_2022_2_OR_NEWER
                    Expression.Call(objectSelectorVariable, showInfo, objectParameter, typeParameter, Expression.Constant(null, typeof(UnityEngine.Object)), Expression.Constant(false), Expression.Constant(null, typeof(List<int>)), Expression.Constant(null, typeof(Action<UnityEngine.Object>)), onChangedObjectParameter, Expression.Constant(true))
#elif UNITY_2020_1_OR_NEWER
                    Expression.Call(objectSelectorVariable, showInfo, objectParameter, typeParameter, Expression.Constant(null, typeof(UnityEngine.Object)), Expression.Constant(false), Expression.Constant(null, typeof(List<int>)), Expression.Constant(null, typeof(Action<UnityEngine.Object>)), onChangedObjectParameter)
#else
                    Expression.Call(objectSelectorVariable, showInfo, objectParameter, typeParameter, Expression.Constant(null, typeof(SerializedProperty)), Expression.Constant(false), Expression.Constant(null, typeof(List<int>)), Expression.Constant(null, typeof(Action<UnityEngine.Object>)), onChangedObjectParameter)
#endif
                );
                var showObjectSelectorLambda = Expression.Lambda<Action<UnityEngine.Object, Type, Action<UnityEngine.Object>>>(showObjectSelectorBlock, objectParameter, typeParameter, onChangedObjectParameter);
                ShowObjectSelector = showObjectSelectorLambda.Compile();

                var instanceCall = Expression.Call(null, instanceObjectSelectorInfo.GetGetMethod());
                var objectSelectorIDField = Expression.Field(instanceCall, "objectSelectorID");
                var getSelectorIDLambda = Expression.Lambda<Func<int>>(objectSelectorIDField);
                GetSelectorID = getSelectorIDLambda.Compile();

                var inSelectorIDParam = Expression.Parameter(typeof(int), "value");
                var setSelectorIDLambda = Expression.Lambda<Action<int>>(Expression.Assign(objectSelectorIDField, inSelectorIDParam), inSelectorIDParam);
                SetSelectorID = setSelectorIDLambda.Compile();

                var getCurrentObjectInfo = objectSelectorType.GetMethod("GetCurrentObject");
                var getCurrentObjectLambda = Expression.Lambda<Func<UnityEngine.Object>>(Expression.Call(null, getCurrentObjectInfo));
                GetCurrentObject = getCurrentObjectLambda.Compile();
            }

            public static void Show(UnityEngine.Object obj, Type type, Action<UnityEngine.Object> onChangedObject, Action onClose)
            {
                id = GUIUtility.GetControlID("s_ObjectFieldHash".GetHashCode(), FocusType.Keyboard);
                GUIUtility.keyboardControl = id;
                ShowObjectSelector(obj, type, onChangedObject);
                selectorID = id;
                ObjectSelector.s_OnClose = onClose;
                EditorApplication.update += CheckClose;
            }

            static void CheckClose()
            {
                if (!opened)
                {
                    ObjectSelector.s_OnClose?.Invoke();
                    EditorApplication.update -= CheckClose;
                }
            }

            public static void CheckAssignationEvent<T>(Action<T> assignator)
                where T : UnityEngine.Object
            {
                Event evt = Event.current;
                if (evt.type != EventType.ExecuteCommand)
                    return;
                string commandName = evt.commandName;
                if (commandName != ObjectSelectorUpdatedCommand || selectorID != id)
                    return;
                T current = GetCurrentObject() as T;
                if (current == null)
                    return;
                assignator(current);
                GUI.changed = true;
                evt.Use();
            }
        }

        void CreateOrLoad<T>(Action onCancel, Action<T> onObjectChanged)
            where T : ScriptableObject
        {
            string title;
            string content;
            UnityEngine.Object target;
            if (typeof(T) == typeof(HDRenderPipelineAsset))
            {
                title = Style.hdrpAssetDisplayDialogTitle;
                content = Style.hdrpAssetDisplayDialogContent;
                target = GraphicsSettings.defaultRenderPipeline as HDRenderPipelineAsset;
            }
            else
                throw new ArgumentException("Unknown type used");

            switch (EditorUtility.DisplayDialogComplex(title, content, Style.displayDialogCreate, "Cancel", Style.displayDialogLoad))
            {
                case 0: //create
                    if (!AssetDatabase.IsValidFolder("Assets/" + HDProjectSettings.projectSettingsFolderPath))
                        AssetDatabase.CreateFolder("Assets", HDProjectSettings.projectSettingsFolderPath);
                    var asset = ScriptableObject.CreateInstance<T>();
                    asset.name = typeof(T).Name;
                    AssetDatabase.CreateAsset(asset, "Assets/" + HDProjectSettings.projectSettingsFolderPath + "/" + asset.name + ".asset");
                    AssetDatabase.SaveAssets();
                    AssetDatabase.Refresh();

                    if (typeof(T) == typeof(HDRenderPipelineAsset))
                        GraphicsSettings.defaultRenderPipeline = asset as HDRenderPipelineAsset;
                    break;
                case 1: //cancel
                    onCancel?.Invoke();
                    break;
                case 2: //Load
                {
                    m_Fixer.Pause();
                    ObjectSelector.Show(target, typeof(T), o => onObjectChanged?.Invoke((T)o), m_Fixer.Unpause);
                    break;
                }

                default:
                    throw new ArgumentException("Unrecognized option");
            }
        }

        #endregion

        #region UIELEMENT

        abstract class VisualElementUpdatable : VisualElement
        {
            protected Func<Result> m_Tester;
            bool m_HaveFixer;
            public Result currentStatus { get; private set; }

            protected VisualElementUpdatable(Func<Result> tester, bool haveFixer)
            {
                m_Tester = tester;
                m_HaveFixer = haveFixer;
            }

            public virtual void CheckUpdate()
            {
                var wellConfigured = m_Tester();
                if (wellConfigured != currentStatus)
                    currentStatus = wellConfigured;

                UpdateDisplay(wellConfigured, m_HaveFixer);
            }

            public void Init() => UpdateDisplay(currentStatus, m_HaveFixer);

            public abstract void UpdateDisplay(Result status, bool haveFixer);
        }

        class ConfigInfoLine : VisualElementUpdatable
        {
            static class Style
            {
                public const int k_IndentStepSize = 15;
            }

            readonly bool m_VisibleStatus;
            readonly bool m_SkipErrorIcon;
            private Image m_StatusOk;
            private Image m_StatusKO;
            private Image m_StatusPending;
            private Button m_Resolver;
            private HelpBox m_HelpBox;
            public ConfigInfoLine(Entry entry)
                : base(() => entry.check(), entry.fix != null)
            {

                m_VisibleStatus = entry.configStyle.messageType == MessageType.Error || entry.forceDisplayCheck;
                m_SkipErrorIcon = entry.skipErrorIcon;
                var testLabel = new Label(entry.configStyle.label)
                {
                    name = "TestLabel",
                    style =
                    {
                        paddingLeft = style.paddingLeft.value.value + entry.indent * Style.k_IndentStepSize
                    }
                };

                var testRow = new VisualElement()
                {
                    name = "TestRow",
                    style =
                    {
                        marginBottom = 2,
                    }
                };
                testRow.Add(testLabel);

                m_StatusOk = new Image()
                {
                    image = CoreEditorStyles.iconComplete,
                    name = "StatusOK",
                    style =
                    {
                        height = 16,
                        width = 16
                    }
                };
                m_StatusKO = new Image()
                {
                    image = CoreEditorStyles.iconFail,
                    name = "StatusError",
                    style =
                    {
                        height = 16,
                        width = 16
                    }
                };
                m_StatusPending = new Image()
                {
                    image = CoreEditorStyles.iconPending,
                    name = "StatusPending",
                    style =
                    {
                        height = 16,
                        width = 16
                    }
                };
                testRow.Add(m_StatusOk);
                testRow.Add(m_StatusKO);
                testRow.Add(m_StatusPending);

                Add(testRow);
                var kind = entry.configStyle.messageType switch
                {
                    MessageType.Error => HelpBoxMessageType.Error,
                    MessageType.Warning => HelpBoxMessageType.Warning,
                    MessageType.Info => HelpBoxMessageType.Info,
                    _ => HelpBoxMessageType.None,
                };

                string error = entry.configStyle.error;

                // If it is necessary, append tht name of the current asset.
                var hdrpAsset = HDRenderPipeline.currentAsset;
                if (entry.displayAssetName && hdrpAsset != null)
                {
                    error += " (" + hdrpAsset.name + ").";
                }

                m_HelpBox = new HelpBox(error, kind);
                m_HelpBox.Q<Label>().style.flexGrow = 1;

                m_Resolver = new Button(() =>
                {
                    if (entry.fix != null)
                    {
                        string context = "{" + $"\"id\" : \"{entry.configStyle.label}\"" + "}";
                        GraphicsToolUsageAnalytic.ActionPerformed<HDWizard>("Fix", new string[] { context });
                        entry.fix.Invoke(false);
                    }
                })
                {
                    text = entry.configStyle.button,
                    name = "Resolver",
                    style =
                    {
                        position = Position.Relative,
                    }
                };

                m_HelpBox.Add(m_Resolver);
                Add(m_HelpBox);

                Init();
            }

            public override void UpdateDisplay(Result status, bool haveFixer)
            {
                m_StatusOk.style.display = DisplayStyle.None;
                m_StatusKO.style.display = DisplayStyle.None;
                m_StatusPending.style.display = DisplayStyle.None;

                if (m_VisibleStatus)
                {
                    m_StatusOk.style.display = status == Result.OK ? DisplayStyle.Flex : DisplayStyle.None;
                    m_StatusPending.style.display = status == Result.Pending ? DisplayStyle.Flex : DisplayStyle.None;
                    if (!m_SkipErrorIcon)
                        m_StatusKO.style.display = status == Result.Failed ? DisplayStyle.Flex : DisplayStyle.None;
                }

                m_Resolver.style.display = status != Result.Failed || !haveFixer ? DisplayStyle.None : DisplayStyle.Flex;
                m_HelpBox.style.display = status != Result.Failed ? DisplayStyle.None : DisplayStyle.Flex;
            }
        }

        class FixAllButton : VisualElementUpdatable
        {
            public FixAllButton(string label, Func<Result> tester, Action resolver)
                : base(tester, resolver != null)
            {
                Add(new Button(resolver)
                {
                    text = label,
                    name = "FixAll"
                });

                AddToClassList("FixAllButton");

                Init();
            }

            public override void UpdateDisplay(Result status, bool haveFixer)
                => this.Q(name: "FixAll").style.display = status != Result.Failed ? DisplayStyle.None : DisplayStyle.Flex;
        }

        class ScopeBox : VisualElementUpdatable
        {
            readonly Label label;

            public ScopeBox(string title) : base(null, false)
            {
                label = new Label(title);
                label.AddToClassList("ScopeBoxLabel");
                AddToClassList("ScopeBox");
                Add(label);
            }

            public override void CheckUpdate()
            {
                foreach (VisualElementUpdatable updatable in Children().Where(e => e is VisualElementUpdatable))
                    updatable.CheckUpdate();
            }

            public override void UpdateDisplay(Result status, bool haveFixer)
            {
                bool hasChildren = false;
                foreach (VisualElementUpdatable updatable in Children().Where(e => e is VisualElementUpdatable))
                {
                    updatable.UpdateDisplay(status, haveFixer);
                    hasChildren = true;
                }

                style.display = hasChildren ? DisplayStyle.Flex : DisplayStyle.None;
            }
        }

        class InclusiveModeElement : VisualElementUpdatable
        {
            private InclusiveMode m_Mode;
            private ScopeBox m_GlobalScope;
            private ScopeBox m_CurrentScope;
            private FixAllButton m_FixAllButton;
            private HDWizard m_Wizard;

            private bool m_AvailableInCurrentPlatform = true;

            public InclusiveModeElement(InclusiveMode mode, string label, string tooltip, HDWizard wizard)
                : base(null, false)
            {
                m_Mode = mode;
                m_Wizard = wizard;

                var foldout = new HeaderFoldout
                {
                    text = label,
                    tooltip = tooltip,
                    documentationURL = DocumentationInfo.GetPageLink(Documentation.packageName, $"Render-Pipeline-Wizard", $"{mode}Tab")
                };

                m_FixAllButton = new FixAllButton(
                    Style.resolveAll,
                    () => m_Wizard.IsAFixAvailableInScope(m_Mode) ? Result.OK : Result.Failed,
                    () => m_Wizard.FixAllEntryInScope(m_Mode));

                bool userOnWindows = RuntimeInformation.IsOSPlatform(System.Runtime.InteropServices.OSPlatform.Windows);

                if (userOnWindows)
                    foldout.Add(m_FixAllButton);

                m_GlobalScope = new ScopeBox(Style.global);
                foldout.Add(m_GlobalScope);

                m_CurrentScope = new ScopeBox(Style.currentQuality);
                foldout.Add(m_CurrentScope);

                if (!userOnWindows)
                {
                    // VR and DXR are only supported on windows
                    if (m_Mode == InclusiveMode.VR || m_Mode == InclusiveMode.DXROptional)
                    {
                        m_AvailableInCurrentPlatform = false;
                        foldout.Add(new HelpBox("This section is not available in your current OS platform.", HelpBoxMessageType.Warning));
                    }
                }

                foldout.value = HDUserSettings.IsOpen(mode);
                foldout.RegisterValueChangedCallback(evt => HDUserSettings.SetOpen(mode, evt.newValue));

                Add(foldout);
            }

            public void Add(Entry entry, ConfigInfoLine configLine)
            {
                if (!m_AvailableInCurrentPlatform || entry.inclusiveScope != m_Mode)
                    return;

                if (entry.scope == QualityScope.Global)
                    m_GlobalScope.Add(configLine);
                else
                    m_CurrentScope.Add(configLine);
            }

            public override void CheckUpdate()
            {
                m_GlobalScope.CheckUpdate();
                m_CurrentScope.CheckUpdate();
                m_FixAllButton.CheckUpdate();
            }

            public override void UpdateDisplay(Result status, bool haveFixer)
            {
                m_GlobalScope.UpdateDisplay(status, haveFixer);
                m_CurrentScope.UpdateDisplay(status, haveFixer);
                m_FixAllButton.UpdateDisplay(status, haveFixer);
            }
        }

        #endregion
    }
}