package services

import (
	"ai_scheduler/internal/biz"
	"ai_scheduler/internal/config"
	"ai_scheduler/internal/data/constants"
	"ai_scheduler/internal/entitys"
	"ai_scheduler/internal/gateway"
	"context"
	"encoding/json"
	"log"
	"sync"
	"time"

	"github.com/gofiber/fiber/v2"
	"github.com/gofiber/websocket/v2"
)

// ChatHandler 聊天处理器
type ChatService struct {
	routerBiz *biz.AiRouterBiz
	Gw        *gateway.Gateway
	mu        sync.Mutex
	ChatHis   *biz.ChatHistoryBiz
	cfg       *config.Config
}

// NewChatHandler 创建聊天处理器
func NewChatService(
	routerService *biz.AiRouterBiz,
	chatHis *biz.ChatHistoryBiz,
	gw *gateway.Gateway,
	cfg *config.Config,
) *ChatService {
	return &ChatService{
		routerBiz: routerService,
		Gw:        gw,
		ChatHis:   chatHis,
		cfg:       cfg,
	}
}

func (h *ChatService) ChatFail(c *websocket.Conn, content string) {
	err := c.WriteMessage(websocket.TextMessage, []byte(content))
	if err != nil {
		log.Println("发送错误:", err)
	}
	_ = c.Close()
}

// Chat 处理WebSocket聊天连接
// 这是WebSocket处理的主入口函数
func (h *ChatService) Chat(c *websocket.Conn) {
	ctx, cancel := context.WithCancel(context.Background())

	// 创建新的客户端实例
	client := gateway.NewClient(c, ctx, cancel)

	// 验证并收集连接数据，后续对话中会使用
	if err := client.DataAuth(); err != nil {
		log.Println("数据验证错误:", err)
		_ = client.SendFunc([]byte(err.Error()))
		client.Close()
		return
	}

	// 验证通过后，将客户端添加到网关管理
	h.Gw.AddClient(client)

	// 使用信号量限制并发处理的消息数量
	semaphore := make(chan struct{}, 1) // 最多1个并发消息处理
	// 用于等待所有goroutine完成的wait group
	var wg sync.WaitGroup
	// 确保在函数返回时移除客户端并关闭连接
	defer func() {
		wg.Wait()        // 等待所有消息处理goroutine完成
		close(semaphore) // 关闭信号量通道
		h.Gw.Cleanup(client.GetID())
	}()

	// 绑定会话ID, sessionId 为空时, 则不绑定
	if uid := client.GetSession(); uid != "" {
		if err := h.Gw.BindUid(client.GetID(), uid); err != nil {
			log.Println("绑定UID错误:", err)
		}
	}

	// 开启心跳检测
	go client.InitHeartbeat(time.Duration(h.cfg.Sys.HeartbeatInterval))

	// 循环读取客户端消息
	for {
		messageType, message, err := client.ReadMessage()
		if err != nil {
			log.Printf("读取错误: %v, 客户端ID: %s", err, client.GetID())
			break
		}

		// 处理心跳消息
		if messageType == websocket.PingMessage || string(message) == "PING" {
			client.LastActive = time.Now()
			msgType := websocket.TextMessage
			if messageType == websocket.PingMessage {
				msgType = websocket.PongMessage
			}
			if err = client.SendMessage(msgType, []byte(`PONG`)); err != nil {
				log.Printf("发送pong消息失败: %v", err)
			}
			continue
		}

		// 使用信号量限制并发
		semaphore <- struct{}{}
		wg.Add(1)
		go func(msgType int, msg []byte) {
			defer func() {
				<-semaphore
				wg.Done()
				// 恢复panic
				if r := recover(); r != nil {
					log.Printf("消息处理goroutine发生panic: %v", r)
				}
			}()

			// 消息处理逻辑
			h.processMessage(client, msgType, msg)
		}(messageType, message)
	}
}

// 将消息处理逻辑提取到单独的方法
func (h *ChatService) processMessage(client *gateway.Client, msgType int, msg []byte) {
	// 处理消息
	processedMsg, _ := h.handleMessageToString(client, msgType, msg)
	log.Printf("收到消息:消息类型 %d, 内容 %s, 客户端ID: %s",
		msgType, string(processedMsg), client.GetID())

	// 解析请求
	var req entitys.ChatSockRequest
	if err := json.Unmarshal(processedMsg, &req); err != nil {
		log.Printf("JSON解析错误: %v, 客户端ID: %s", err, client.GetID())
		return
	}

	// 路由处理请求
	if err := h.routerBiz.RouteWithSocket(client, &req); err != nil {
		log.Printf("处理失败: %v, 客户端ID: %s", err, client.GetID())
	}
}

// handleMessageToString 处理不同类型的WebSocket消息
// 参数:
//   - client: 客户端对象
//   - msgType: 消息类型
//   - msg: 消息内容
//
// 返回:
//   - text: 处理后的文本内容
//   - chatType: 连接状态
func (h *ChatService) handleMessageToString(client *gateway.Client, msgType int, msg any) (text []byte, chatType constants.ConnStatus) {
	switch msgType {
	case websocket.TextMessage:
		return msg.([]byte), constants.ConnStatusNormal
	case websocket.BinaryMessage:
		return msg.([]byte), constants.ConnStatusNormal
	case websocket.CloseMessage:

		return nil, constants.ConnStatusClosed
	case websocket.PingMessage:
		return nil, constants.ConnStatusIgnore
	case websocket.PongMessage:
		return nil, constants.ConnStatusIgnore
	default:
		log.Printf("未知的消息类型: %d", msgType)
		return nil, constants.ConnStatusIgnore
	}
}

func (s *ChatService) Useful(c *fiber.Ctx) error {
	req := &entitys.UseFulRequest{}
	if err := c.BodyParser(req); err != nil {
		return err
	}

	err := s.ChatHis.Update(c.Context(), req)

	if err != nil {
		return err
	}

	return nil
}

func (s *ChatService) UsefulList(c *fiber.Ctx) error {

	return c.JSON(constants.UseFulMap)
}