using Microsoft.Extensions.Logging;
using Newtonsoft.Json.Linq;
using Newtonsoft.Json;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using WebSocket4Net;

namespace CoreAgent.ProtocolClient.Managers.WebSocketMgr
{
    public partial class WebSocketMessageManager
    {
        #region 私有方法

        /// <summary>
        /// 检查对象是否已释放
        /// </summary>
        private void ThrowIfDisposed()
        {
            if (_disposed)
                throw new ObjectDisposedException(nameof(WebSocketMessageManager));
        }

        /// <summary>
        /// WebSocket连接打开事件处理器
        /// </summary>
        private void OnSocketOpened(object? sender, EventArgs e)
        {
            try
            {
                _logger.LogInformation($"[{_clientName}] WebSocket连接已建立");
                ConnectionOpened?.Invoke(this, EventArgs.Empty);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"[{_clientName}] 处理连接打开事件异常: {ex.Message}");
            }
        }

        /// <summary>
        /// WebSocket连接关闭事件处理器
        /// </summary>
        private void OnSocketClosed(object? sender, EventArgs e)
        {
            try
            {
                _logger.LogInformation($"[{_clientName}] WebSocket连接已关闭");
                ConnectionClosed?.Invoke(this, EventArgs.Empty);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"[{_clientName}] 处理连接关闭事件异常: {ex.Message}");
            }
        }

        /// <summary>
        /// WebSocket消息接收事件处理器
        /// </summary>
        private void OnSocketMessageReceived(object? sender, MessageReceivedEventArgs e)
        {
            try
            {
                var messageText = e.Message;
                _logger.LogDebug($"[{_clientName}] 接收到消息: {messageText}");

                // 解析消息
                JObject? message = null;
                try
                {
                    message = JObject.Parse(messageText);
                }
                catch (JsonException ex)
                {
                    _logger.LogError(ex, $"[{_clientName}] 消息解析失败: {messageText}");
                    ConnectionError?.Invoke(this, $"消息解析失败: {ex.Message}");
                    return;
                }

                // 触发MessageReceived事件
                MessageReceived?.Invoke(this, message);

                // 处理消息
                HandleReceivedMessage(message, error => ConnectionError?.Invoke(this, error));
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"[{_clientName}] 处理接收消息异常: {ex.Message}");
                ConnectionError?.Invoke(this, $"处理接收消息异常: {ex.Message}");
            }
        }

        /// <summary>
        /// WebSocket错误事件处理器
        /// </summary>
        private void OnSocketError(object? sender, SuperSocket.ClientEngine.ErrorEventArgs e)
        {
            try
            {
                var errorMessage = e.Exception?.Message ?? "WebSocket连接错误";
                _logger.LogError(e.Exception, $"[{_clientName}] WebSocket错误: {errorMessage}");
                ConnectionError?.Invoke(this, errorMessage);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"[{_clientName}] 处理WebSocket错误事件异常: {ex.Message}");
            }
        }

        /// <summary>
        /// 启动消息延迟发送定时器
        /// </summary>
        private void StartMessageDeferTimer()
        {
            Timer? timer = null;
            timer = new Timer(_ =>
            {
                try
                {
                    OnMessageDeferTimer(null);
                }
                finally
                {
                    timer?.Dispose(); // 用完即销毁
                }
            }, null, 1, Timeout.Infinite);
        }

        /// <summary>
        /// 停止消息延迟发送定时器
        /// </summary>
        private void StopMessageDeferTimer()
        {
            // 新实现下无需手动停止定时器，方法保留兼容性
        }

        /// <summary>
        /// 消息延迟发送定时器回调
        /// </summary>
        private void OnMessageDeferTimer(object? state)
        {
            try
            {
                // 批量发送消息
                var messages = new List<JObject>();
                var count = 0;
                const int batchSize = 100;

                // 从队列中取出消息
                while (count < batchSize && _messageFifo.TryTake(out var message))
                {
                    messages.Add(message);
                    count++;
                }

                if (messages.Count > 0)
                {
                    // 发送消息
                    SendMessageNow(messages);
                }

                // 如果队列中还有消息，继续启动定时器
                if (_messageFifo.Count > 0)
                {
                    StartMessageDeferTimer();
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"[{_clientName}] 消息延迟发送定时器异常: {ex.Message}");
            }
        }

        /// <summary>
        /// 立即发送消息
        /// </summary>
        private void SendMessageNow(List<JObject> messages)
        {
            if (messages == null || messages.Count == 0)
                return;

            if (!IsConnected)
            {
                _logger.LogWarning($"[{_clientName}] WebSocket未连接，无法发送消息");
                return;
            }

            try
            {
                foreach (var message in messages)
                {
                    var messageText = JsonConvert.SerializeObject(message);
                    _webSocket?.Send(messageText);

                    // 触发MessageSent事件
                    MessageSent?.Invoke(this, message);

                    _logger.LogDebug($"[{_clientName}] 消息已发送: {messageText}");
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"[{_clientName}] 发送消息异常: {ex.Message}");
                ConnectionError?.Invoke(this, $"发送消息异常: {ex.Message}");
            }
        }

        /// <summary>
        /// 清空消息队列
        /// </summary>
        private void ClearMessageQueue()
        {
            var count = 0;
            while (_messageFifo.TryTake(out _))
            {
                count++;
            }

            if (count > 0)
            {
                _logger.LogInformation($"[{_clientName}] 清空消息队列，丢弃 {count} 条消息");
            }
        }

        #endregion
    }
}