using Microsoft.Extensions.Options;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using WIDESEAWCS_QuartzJob;

namespace WIDESEAWCS_Tasks.SocketServer
{
    /// <summary>
    /// TCP Socket·þÎñ¶Ë£¨»ùÓÚÐÐЭÒ飬°´»»Ðзû·Ö¸îÏûÏ¢£©
    /// </summary>
    public partial class TcpSocketServer : IDisposable
    {
        private readonly SocketServerOptions _options;
        public readonly object _syncRoot = new();
        private TcpListener? _listener;
        public CancellationTokenSource? _cts;
        public readonly List<Task> _clientTasks = new();
        public readonly Dictionary<string, TcpClient> _clients = new();
        public readonly Dictionary<string, string> _deviceBindings = new();
        public readonly Dictionary<string, SemaphoreSlim> _clientLocks = new();
        public readonly Dictionary<string, Encoding> _clientEncodings = new();
        public readonly Dictionary<string, DateTime> _clientLastActive = new();
        public readonly Encoding _textEncoding;
        public readonly Encoding? _autoDetectedGb2312;
        private readonly string _logFile;
        private Task? _monitorTask;

        public TcpSocketServer(IOptions<SocketServerOptions> options)
        {
            _options = options.Value;
            if (_options.AutoDetectEncoding)
            {
                _textEncoding = Encoding.UTF8;
                try { _autoDetectedGb2312 = Encoding.GetEncoding("GBK"); } catch { _autoDetectedGb2312 = null; }
            }
            else
            {
                try { _textEncoding = Encoding.GetEncoding(_options.EncodingName ?? "utf-8"); }
                catch { _textEncoding = Encoding.UTF8; }
                _autoDetectedGb2312 = null;
            }

            _logFile = Path.Combine(AppContext.BaseDirectory ?? ".", _options.LogFilePath ?? "socketserver.log");
            Log($"[{DateTime.Now}] TcpSocketServer starting");
        }

        public bool IsRunning { get; private set; }

        public event Func<string, bool, TcpClient, RobotSocketState, Task<string?>>? MessageReceived;
        public event Func<string, Task<string?>>? RobotReceived;

        private void Log(string message)
        {
            Console.WriteLine(message);
            try { File.AppendAllText(_logFile, message + Environment.NewLine); } catch { }
        }
    }
}