using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.Networking;
using Newtonsoft.Json;

public class AvatarSyncClient : MonoBehaviour
{
    [Header("Server Configuration")]
    [SerializeField] private string serverHost = "127.0.0.1";
    [SerializeField] private int serverPort = 8080;
    [SerializeField] private string targetPlayer = "player1"; // Which player data to fetch
    
    [Header("Sync Configuration")]
    [SerializeField] private bool autoSync = true;
    [SerializeField] private float syncInterval = 0.1f; // How often to fetch data (in seconds)
    [SerializeField] private string localFileName = ""; // Leave empty to use targetPlayer name
    
    [Header("Upload Configuration")]
    [SerializeField] private bool uploadLocalData = false; // Upload this client's data to server
    [SerializeField] private string localDataFile = "avatar_sync_data.json"; // Local file to upload
    [SerializeField] private string uploadAsPlayer = "player2"; // Upload as which player
    
    [Header("Debug")]
    [SerializeField] private bool enableDebugMode = false;
    [SerializeField] private bool showConnectionStatus = true;
    
    private string syncFilesPath;
    private string outputFilePath;
    private Coroutine syncCoroutine;
    private bool isConnected = false;
    private float lastSuccessfulSync = 0f;
    private int totalRequests = 0;
    private int successfulRequests = 0;
    
    // Connection status
    public bool IsConnected => isConnected;
    public string ServerUrl => $"http://{serverHost}:{serverPort}";
    public float LastSyncTime => lastSuccessfulSync;
    public float SuccessRate => totalRequests > 0 ? (float)successfulRequests / totalRequests : 0f;
    
    void Start()
    {
        // Set up file paths
        syncFilesPath = Path.Combine(Application.dataPath, "Sync-Files");
        if (!Directory.Exists(syncFilesPath))
        {
            Directory.CreateDirectory(syncFilesPath);
        }
        
        // Determine output file name
        string fileName = string.IsNullOrEmpty(localFileName) ? $"{targetPlayer}.json" : localFileName;
        outputFilePath = Path.Combine(syncFilesPath, fileName);
        
        Debug.Log($"Avatar Sync Client initialized");
        Debug.Log($"Server: {ServerUrl}");
        Debug.Log($"Target Player: {targetPlayer}");
        Debug.Log($"Output File: {outputFilePath}");
        Debug.Log($"Upload Mode: {(uploadLocalData ? $"Yes (as {uploadAsPlayer})" : "No")}");
        
        // Start syncing if auto-sync is enabled
        if (autoSync)
        {
            StartSync();
        }
        
        // Test connection
        StartCoroutine(TestConnection());
    }
    
    void OnValidate()
    {
        // Ensure valid values
        if (syncInterval < 0.01f)
            syncInterval = 0.01f;
            
        if (serverPort < 1 || serverPort > 65535)
            serverPort = 8080;
    }
    
    public void StartSync()
    {
        if (syncCoroutine == null)
        {
            syncCoroutine = StartCoroutine(SyncLoop());
            Debug.Log("Avatar sync started");
        }
    }
    
    public void StopSync()
    {
        if (syncCoroutine != null)
        {
            StopCoroutine(syncCoroutine);
            syncCoroutine = null;
            Debug.Log("Avatar sync stopped");
        }
    }
    
    IEnumerator TestConnection()
    {
        string url = $"{ServerUrl}/status";
        
        using (UnityWebRequest request = UnityWebRequest.Get(url))
        {
            request.timeout = 5; // 5 second timeout for connection test
            
            yield return request.SendWebRequest();
            
            if (request.result == UnityWebRequest.Result.Success)
            {
                isConnected = true;
                if (showConnectionStatus)
                {
                    Debug.Log($"Successfully connected to avatar sync server at {ServerUrl}");
                }
                
                // Try to parse server status
                try
                {
                    var status = JsonConvert.DeserializeObject<Dictionary<string, object>>(request.downloadHandler.text);
                    if (enableDebugMode)
                    {
                        Debug.Log($"Server status: {request.downloadHandler.text}");
                    }
                }
                catch (Exception e)
                {
                    if (enableDebugMode)
                    {
                        Debug.LogWarning($"Could not parse server status: {e.Message}");
                    }
                }
            }
            else
            {
                isConnected = false;
                if (showConnectionStatus)
                {
                    Debug.LogWarning($"Failed to connect to avatar sync server at {ServerUrl}: {request.error}");
                }
            }
        }
    }
    
    IEnumerator SyncLoop()
    {
        while (true)
        {
            // Upload local data if enabled
            if (uploadLocalData)
            {
                yield return StartCoroutine(UploadLocalData());
            }
            
            // Fetch remote player data
            yield return StartCoroutine(FetchPlayerData());
            
            yield return new WaitForSeconds(syncInterval);
        }
    }
    
    IEnumerator FetchPlayerData()
    {
        string url = $"{ServerUrl}/{targetPlayer}";
        totalRequests++;
        
        using (UnityWebRequest request = UnityWebRequest.Get(url))
        {
            request.timeout = 10; // 10 second timeout
            
            yield return request.SendWebRequest();
            
            if (request.result == UnityWebRequest.Result.Success)
            {
                try
                {
                    // Validate JSON
                    var avatarData = JsonConvert.DeserializeObject<AvatarSyncData>(request.downloadHandler.text);
                    
                    if (avatarData != null)
                    {
                        // Write to local file
                        File.WriteAllText(outputFilePath, request.downloadHandler.text);
                        
                        successfulRequests++;
                        lastSuccessfulSync = Time.time;
                        isConnected = true;
                        
                        if (enableDebugMode)
                        {
                            Debug.Log($"Successfully fetched and saved data for {targetPlayer}. Timestamp: {avatarData.timestamp}");
                        }
                    }
                    else
                    {
                        if (enableDebugMode)
                        {
                            Debug.LogWarning($"Received null avatar data for {targetPlayer}");
                        }
                    }
                }
                catch (Exception e)
                {
                    Debug.LogError($"Error processing avatar data for {targetPlayer}: {e.Message}");
                }
            }
            else
            {
                isConnected = false;
                if (enableDebugMode)
                {
                    Debug.LogWarning($"Failed to fetch data for {targetPlayer}: {request.error}");
                }
            }
        }
    }
    
    IEnumerator UploadLocalData()
    {
        string localFilePath = Path.Combine(syncFilesPath, localDataFile);
        
        if (!File.Exists(localFilePath))
        {
            if (enableDebugMode)
            {
                Debug.LogWarning($"Local data file not found: {localFilePath}");
            }
            yield break;
        }
        
        string jsonData = null;
        AvatarSyncData avatarData = null;
        
        // Read and validate file outside of try block with yield
        try
        {
            jsonData = File.ReadAllText(localFilePath);
            avatarData = JsonConvert.DeserializeObject<AvatarSyncData>(jsonData);
        }
        catch (Exception e)
        {
            Debug.LogError($"Error reading/parsing local data file: {e.Message}");
            yield break;
        }
        
        if (avatarData == null)
        {
            if (enableDebugMode)
            {
                Debug.LogWarning("Local avatar data is invalid, skipping upload");
            }
            yield break;
        }
        
        // Network request without try-catch since we can't yield in try-catch
        string url = $"{ServerUrl}/{uploadAsPlayer}";
        
        using (UnityWebRequest request = new UnityWebRequest(url, "POST"))
        {
            byte[] jsonBytes = System.Text.Encoding.UTF8.GetBytes(jsonData);
            request.uploadHandler = new UploadHandlerRaw(jsonBytes);
            request.downloadHandler = new DownloadHandlerBuffer();
            request.SetRequestHeader("Content-Type", "application/json");
            request.timeout = 10;
            
            yield return request.SendWebRequest();
            
            if (request.result == UnityWebRequest.Result.Success)
            {
                if (enableDebugMode)
                {
                    Debug.Log($"Successfully uploaded data as {uploadAsPlayer}");
                }
            }
            else
            {
                if (enableDebugMode)
                {
                    Debug.LogWarning($"Failed to upload data as {uploadAsPlayer}: {request.error}");
                }
            }
        }
    }
    
    // Public methods for runtime control
    public void SetServerAddress(string host, int port)
    {
        serverHost = host;
        serverPort = port;
        
        // Test new connection
        StartCoroutine(TestConnection());
    }
    
    public void SetTargetPlayer(string player)
    {
        targetPlayer = player;
        
        // Update output file path
        string fileName = string.IsNullOrEmpty(localFileName) ? $"{targetPlayer}.json" : localFileName;
        outputFilePath = Path.Combine(syncFilesPath, fileName);
    }
    
    public void ManualSync()
    {
        if (gameObject.activeInHierarchy)
        {
            StartCoroutine(FetchPlayerData());
        }
    }
    
    // Get current stats for UI display
    public string GetConnectionStats()
    {
        return $"Connected: {isConnected}\n" +
               $"Success Rate: {(SuccessRate * 100):F1}%\n" +
               $"Total Requests: {totalRequests}\n" +
               $"Last Sync: {(Time.time - lastSuccessfulSync):F1}s ago";
    }
    
    void OnDisable()
    {
        StopSync();
    }
    
    void OnDestroy()
    {
        StopSync();
    }
    
    // GUI for runtime debugging
    void OnGUI()
    {
        if (!enableDebugMode)
            return;
            
        GUILayout.BeginArea(new Rect(10, 10, 300, 200));
        GUILayout.BeginVertical("box");
        
        GUILayout.Label($"Avatar Sync Client - {targetPlayer}");
        GUILayout.Label($"Server: {ServerUrl}");
        GUILayout.Label($"Status: {(isConnected ? "Connected" : "Disconnected")}");
        GUILayout.Label($"Success Rate: {(SuccessRate * 100):F1}%");
        GUILayout.Label($"Last Sync: {(Time.time - lastSuccessfulSync):F1}s ago");
        
        GUILayout.BeginHorizontal();
        if (GUILayout.Button("Manual Sync"))
        {
            ManualSync();
        }
        if (GUILayout.Button("Test Connection"))
        {
            StartCoroutine(TestConnection());
        }
        GUILayout.EndHorizontal();
        
        if (syncCoroutine == null)
        {
            if (GUILayout.Button("Start Auto Sync"))
            {
                StartSync();
            }
        }
        else
        {
            if (GUILayout.Button("Stop Auto Sync"))
            {
                StopSync();
            }
        }
        
        GUILayout.EndVertical();
        GUILayout.EndArea();
    }
}