using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Windows.Threading;

namespace NetDocsForLLM.Services
{
    public enum LogLevel
    {
        Error = 0,
        Warning = 1,
        Info = 2,
        Debug = 3
    }

    /// <summary>
    /// Clase estática para logs que no depende de inyección de dependencias
    /// </summary>
    public static class AppLogger
    {
        private static readonly List<LogEntry> _logEntries = new List<LogEntry>();
        private static int _errorCount = 0;
        private static int _warningCount = 0;
        private static int _typeCount = 0;
        private static int _memberCount = 0;
        private static string _logFilePath;
        private static StreamWriter _fileWriter;

        // Evento que se dispara cuando hay nuevos mensajes
        public static event EventHandler LogUpdated;

        static AppLogger()
        {
            // Configurar archivo de log
            string tempFolder = Path.Combine(Path.GetTempPath(), "NetDocsForLLM_" + DateTime.Now.ToString("yyyyMMdd_HHmmss"));
            Directory.CreateDirectory(tempFolder);
            _logFilePath = Path.Combine(tempFolder, "app_log.txt");
            _fileWriter = new StreamWriter(_logFilePath, true) { AutoFlush = true };

            LogInfo($"Log inicializado en: {_logFilePath}");
        }

        public static void LogDebug(string message)
        {
            AddLogEntry(LogLevel.Debug, message);
        }

        public static void LogInfo(string message)
        {
            AddLogEntry(LogLevel.Info, message);
        }

        public static void LogWarning(string message)
        {
            _warningCount++;
            AddLogEntry(LogLevel.Warning, message);
        }

        public static void LogError(string message)
        {
            _errorCount++;
            AddLogEntry(LogLevel.Error, message);
        }

        public static void LogException(Exception ex)
        {
            _errorCount++;
            StringBuilder sb = new StringBuilder();
            sb.AppendLine($"Excepción: {ex.Message}");

            if (ex.StackTrace != null)
            {
                sb.AppendLine("Stack Trace:");
                sb.AppendLine(ex.StackTrace);
            }

            if (ex.InnerException != null)
            {
                sb.AppendLine($"Inner Exception: {ex.InnerException.Message}");
            }

            AddLogEntry(LogLevel.Error, sb.ToString());
        }

        public static int ErrorCount => _errorCount;
        public static int WarningCount => _warningCount;
        public static int TypeCount => _typeCount;
        public static int MemberCount => _memberCount;

        public static void IncrementTypeCount()
        {
            _typeCount++;
            NotifyLogUpdated();
        }

        public static void IncrementMemberCount()
        {
            _memberCount++;
            NotifyLogUpdated();
        }

        private static void AddLogEntry(LogLevel level, string message)
        {
            var entry = new LogEntry
            {
                Timestamp = DateTime.Now,
                Level = level,
                Message = message
            };

            _logEntries.Add(entry);

            // Escribir al archivo de log
            string levelText = GetLevelText(level);
            string logMessage = $"[{entry.Timestamp:yyyy-MM-dd HH:mm:ss}] [{levelText}] {message}";

            _fileWriter.WriteLine(logMessage);

            // Notificar a los escuchadores
            NotifyLogUpdated();
        }

        private static void NotifyLogUpdated()
        {
            // Invocar el evento en el hilo de la UI si está disponible
            LogUpdated?.Invoke(null, EventArgs.Empty);
        }

        public static string GetContent(LogLevel maxLevel = LogLevel.Debug)
        {
            StringBuilder sb = new StringBuilder();

            foreach (var entry in _logEntries)
            {
                if (entry.Level <= maxLevel)
                {
                    string levelText = GetLevelText(entry.Level);
                    sb.AppendLine($"[{entry.Timestamp:yyyy-MM-dd HH:mm:ss}] [{levelText}] {entry.Message}");
                }
            }

            return sb.ToString();
        }

        private static string GetLevelText(LogLevel level)
        {
            switch (level)
            {
                case LogLevel.Error:
                    return "ERROR";
                case LogLevel.Warning:
                    return "WARN";
                case LogLevel.Info:
                    return "INFO";
                case LogLevel.Debug:
                    return "DEBUG";
                default:
                    return level.ToString();
            }
        }

        public static void Clear()
        {
            _logEntries.Clear();
            _errorCount = 0;
            _warningCount = 0;

            // No reiniciar los contadores de tipos y miembros
            // ya que representan el progreso del análisis

            NotifyLogUpdated();
        }

        private class LogEntry
        {
            public DateTime Timestamp { get; set; }
            public LogLevel Level { get; set; }
            public string Message { get; set; }
        }
    }
}