package services

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

	"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,
	}
}

// ToolCallResponse 工具调用响应
type ToolCallResponse struct {
	ID       string               `json:"id" example:"call_1"`
	Type     string               `json:"type" example:"function"`
	Function FunctionCallResponse `json:"function"`
	Result   interface{}          `json:"result,omitempty"`
}

// FunctionCallResponse 函数调用响应
type FunctionCallResponse struct {
	Name      string      `json:"name" example:"get_weather"`
	Arguments interface{} `json:"arguments"`
}

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) {
	// 创建新的客户端实例
	h.mu.Lock()
	client := gateway.NewClient(c)
	h.mu.Unlock()

	// 将客户端添加到网关管理
	h.Gw.AddClient(client)
	log.Println("client connected:", client.GetID())
	log.Println("客户端已连接")

	// 绑定会话ID
	uid := c.Query("x-session")
	if uid != "" {
		if err := h.Gw.BindUid(client.GetID(), uid); err != nil {
			log.Println("绑定UID错误:", err)
		}
		log.Printf("bind %s -> uid:%s\n", client.GetID(), uid)
	}

	// 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)
		h.ChatFail(c, err.Error())
		return
	}

	// 确保在函数返回时移除客户端并关闭连接
	defer func() {
		h.Gw.RemoveClient(client.GetID())
		_ = c.Close()
		log.Println("client disconnected:", client.GetID())
	}()

	// 循环读取客户端消息
	for {
		// 读取消息
		messageType, message, err := c.ReadMessage()
		if err != nil {
			log.Println("读取错误:", err)
			break
		}

		// 处理消息
		msg, chatType := h.handleMessageToString(c, messageType, message)
		if chatType == constants.ConnStatusClosed {
			break
		}
		if chatType == constants.ConnStatusIgnore {
			continue
		}

		log.Printf("收到消息: %s", string(msg))

		// 解析请求
		var req entitys.ChatSockRequest
		if err = json.Unmarshal(msg, &req); err != nil {
			log.Println("JSON parse error:", err)
			continue
		}

		// 路由处理请求
		err = h.routerBiz.RouteWithSocket(client, &req)
		if err != nil {
			log.Println("处理失败:", err)
		}
	}
}

// handleMessageToString 处理不同类型的WebSocket消息
// 参数:
//   - c: WebSocket连接
//   - 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(c *websocket.Conn, 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:
		// 可选：回复 Pong
		c.WriteMessage(websocket.PongMessage, nil)
		return nil, constants.ConnStatusIgnore
	case websocket.PongMessage:
		return nil, constants.ConnStatusIgnore
	default:
		return nil, constants.ConnStatusIgnore
	}
	return msg.([]byte), 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)
}