using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using Epic.OnlineServices;
using Epic.OnlineServices.Auth;
using Epic.OnlineServices.Connect;
using Epic.OnlineServices.Lobby;
using Epic.OnlineServices.Logging;
using Epic.OnlineServices.Platform;
using Epic.OnlineServices.RTC;
using Epic.OnlineServices.RTCAudio;
using UnityEngine;
using Credentials = Epic.OnlineServices.Auth.Credentials;
using LoginCallbackInfo = Epic.OnlineServices.Auth.LoginCallbackInfo;
using LoginOptions = Epic.OnlineServices.Auth.LoginOptions;

public class MagnificentVoiceChat : MonoBehaviour
{
    private const string DebugLobbyId = "a0f6a51f-6b61-4c95-9ed8-a1d508fe4eb6";
    private const string DebugBucketId = "foobar";
    
    private readonly StringBuilder status = new StringBuilder("Status:\n");
    
    private PlatformInterface platformInterface;
    private AuthInterface authInterface;
    private ConnectInterface connectInterface;
    private LobbyInterface lobbyInterface;
    private RTCInterface rtcInterface;
    private RTCAudioInterface audioInterface;

    private EpicAccountId localEpicAccountId;
    private ProductUserId localProductUserId;

    private EOSVoiceChat voiceChat;

    private string XAudio29DllPath =>
#if UNITY_EDITOR
        Path.Combine(Application.dataPath, @"Plugins\EpicOnlineServices\Bin\x64\xaudio2_9redist.dll");
#else
        Path.Combine(Application.dataPath, @"Plugins\x86_64\xaudio2_9redist.dll");
#endif
    
    void Start()
    {
#if UNITY_EDITOR
        LoadLibrary();
#endif
        
        var result = PlatformInterface.Initialize(new InitializeOptions
        {
            ProductName = "WW1 Test",
            ProductVersion = "0.1",
        });

        if (result != Result.Success)
        {
            Debug.LogError("Failed to initialize EOS, result = " + result);
            return;
        }
        
        LoggingInterface.SetLogLevel(LogCategory.AllCategories, LogLevel.Warning);
        LoggingInterface.SetCallback(OnEOSLogMessage);
        
        var options = new WindowsOptions    // Okay so this will need to be platform-specific
        {
            ProductId = "b21a28c2c5404c8099d72f5a28c59c16",
            SandboxId = "b630f2c3933a4838a971ce53d5b0db3b",
            DeploymentId = "9a36f589572c492fbee14bd299173c12",
            
            ClientCredentials = new ClientCredentials
            {
                ClientId = "xyza7891UOFoUhfvfbKgO2xRCIiuAIjH",
                ClientSecret = "NArwIQT1laFfsS7fdcN1MKDdgwy490w9MBJsAlHN4QI",
            },
            
            Flags = PlatformFlags.DisableOverlay,
            
            CacheDirectory = null,
            EncryptionKey = null,
            
            IsServer = false,
            
            RTCOptions = new WindowsRTCOptions  // This is also platform-specific
            {
                PlatformSpecificOptions = new WindowsRTCOptionsPlatformSpecificOptions
                {
                    XAudio29DllPath = XAudio29DllPath
                }
            },
        };
        
        Debug.Log("XAudio library path: " + XAudio29DllPath);

        platformInterface = PlatformInterface.Create(options);

        if (platformInterface == null)
        {
            Debug.LogError("Failed to create EOS platform interface");
            status.AppendLine("Failed to create EOS platform interface");
            return;
        }
        
        Debug.Log("EOS platform interface successfully created!");
        status.AppendLine("EOS platform interface created");

        authInterface = platformInterface.GetAuthInterface();
        status.AppendLine("Auth interface: " + authInterface);
        
        connectInterface = platformInterface.GetConnectInterface();
        status.AppendLine("Connect interface: " + connectInterface);

        lobbyInterface = platformInterface.GetLobbyInterface();
        status.AppendLine("Lobby interface: " + lobbyInterface);
        
        rtcInterface = platformInterface.GetRTCInterface();    // Real-time communication, needed for audio
        status.AppendLine("RTC interface: " + rtcInterface);
        
        audioInterface = rtcInterface.GetAudioInterface();
        status.AppendLine("Audio interface: " + audioInterface);
        
        authInterface.Login(new LoginOptions
        {
            Credentials = GetEpicCredentials(),
            ScopeFlags = AuthScopeFlags.BasicProfile,
        }, null, HandleLoginResult);

        voiceChat = new EOSVoiceChat(lobbyInterface, rtcInterface, audioInterface, () => localProductUserId);
        voiceChat.OnChatConnected += () => status.AppendLine("Chat lobby successfully connected!");
        voiceChat.OnChatConnectionFailed += () => status.AppendLine("Chat lobby connection failed...");
        voiceChat.OnChatDisconnected += () => status.AppendLine("Chat lobby disconnected");
        voiceChat.OnChatUserJoined += userId => status.AppendLine($"Chat user {userId} joined");
        voiceChat.OnChatUserLeft += userId => status.AppendLine($"Chat user {userId} left");
    }

    private Credentials GetEpicCredentials()    // This is platform-specific
    {
        return new Credentials
        {
            // Type = LoginCredentialType.AccountPortal,  // Use ExternalAuth on console platform
            Id = "192.168.1.100:8888",
            Type = LoginCredentialType.Developer,
            Token = SystemInfo.deviceName,
        };
    }

    private void HandleLoginResult(LoginCallbackInfo data)
    {
        switch (data.ResultCode)
        {
            case Result.Success:
                localEpicAccountId = data.LocalUserId;
                Debug.Log("EOS login successful: " + localEpicAccountId);
                status.AppendLine("EOS login successful: " + localEpicAccountId);
                
                authInterface.CopyUserAuthToken(new CopyUserAuthTokenOptions(), localEpicAccountId, out Token token);
                
                connectInterface.Login(new Epic.OnlineServices.Connect.LoginOptions
                {
                    Credentials = new Epic.OnlineServices.Connect.Credentials
                    {
                        Type = ExternalCredentialType.Epic, // Can be XSTS or PSN ID as well, platform-specific
                        Token = token.AccessToken,
                    },
                }, null, HandleConnectResult);
                break;
            default:
                Debug.Log("EOS login failed, result code = " + data.ResultCode);
                status.AppendLine("EOS login failed");
                break;
        }
    }

    private void HandleConnectResult(Epic.OnlineServices.Connect.LoginCallbackInfo data)
    {
        switch (data.ResultCode)
        {
            case Result.Success:
                localProductUserId = data.LocalUserId;
                Debug.Log("Connect successful: " + localProductUserId);
                status.AppendLine("Connect successful: " + localProductUserId);
                
                CreateOrJoinVoiceLobby();
                break;
            case Result.InvalidUser:
                Debug.Log("Invalid user, creating user...");
                status.AppendLine("Invalid user, creating user...");
                
                connectInterface.CreateUser(new CreateUserOptions
                {
                    ContinuanceToken = data.ContinuanceToken,
                }, null, HandleUserCreated);
                
                break;
            default:
                Debug.Log("Connect failed, result code = " + data.ResultCode);
                status.AppendLine("Connect failed");
                break;
        }
    }

    private void HandleUserCreated(CreateUserCallbackInfo data)
    {
        switch (data.ResultCode)
        {
            case Result.Success:
                localProductUserId = data.LocalUserId;
                Debug.Log("User creation successful: " + localProductUserId);
                status.AppendLine("User creation successful: " + localProductUserId);
                
                CreateOrJoinVoiceLobby();
                break;
            default:
                Debug.Log("User creation failed, result code = " + data.ResultCode);
                status.AppendLine("User creation failed");
                break;
        }
    }

    private void CreateOrJoinVoiceLobby()
    {
        voiceChat.ConnectToChat(DebugLobbyId);
    }

    void Update()
    {
        platformInterface.Tick();
    }

    private void OnDestroy()
    {
        if (voiceChat != null)
        {
            voiceChat.Dispose();
            voiceChat = null;
        }

        if (platformInterface != null)
        {
            platformInterface.Release();
            platformInterface = null;
        }
        
        PlatformInterface.Shutdown();
        
#if UNITY_EDITOR
        UnloadLibrary();
#endif
    }

#if UNITY_EDITOR
    private IntPtr eosLbraryHandle;
    
    private void LoadLibrary()
    {
        eosLbraryHandle = SystemLibrary.LoadLibrary($@"Assets\Plugins\EpicOnlineServices\Bin\{Config.LibraryName}.dll");
        if (eosLbraryHandle == IntPtr.Zero)
        {
            throw new Exception("Could not load EOS library!");
        }
        
        Bindings.Hook(eosLbraryHandle, SystemLibrary.GetProcAddress);
        
        Debug.Log("Hooked EOS library bindings");
        status.AppendLine("Hooked EOS library bindings");
    }

    private void UnloadLibrary()
    {
        Debug.Log("Unhooking EOS library bindings");
        
        Bindings.Unhook();
        
        if (eosLbraryHandle != IntPtr.Zero)
        {
            SystemLibrary.FreeLibrary(eosLbraryHandle);
            eosLbraryHandle = IntPtr.Zero;
        }
    }
#endif

    private void OnEOSLogMessage(LogMessage message)
    {
        switch (message.Level)
        {
            case LogLevel.Fatal:
            case LogLevel.Error:
                Debug.LogError(message.Message);
                break;
            case LogLevel.Warning:
                Debug.LogWarning(message.Message);
                break;
            default:
                Debug.Log(message.Message);
                break;
        }
    }

    private void OnGUI()
    {
        GUI.matrix = Matrix4x4.Scale(new Vector3(2, 2, 1));
        
        GUILayout.Label(status.ToString());
    }
}