package rag

import (
	"eta/eta_api/controllers"
	"eta/eta_api/models"
	"eta/eta_api/models/system"
	"eta/eta_api/services/llm/facade"
	"eta/eta_api/utils"
	"eta/eta_api/utils/ws"
	"fmt"
	"github.com/gorilla/websocket"
	"net"
	"net/http"
	"strings"
	"time"
)

type ChatWsController struct {
	controllers.BaseAuthController
}

func (cc *ChatWsController) Prepare() {
	method := cc.Ctx.Input.Method()
	uri := cc.Ctx.Input.URI()
	if method == "GET" {
		authorization := cc.Ctx.Input.Header("authorization")
		if authorization == "" {
			authorization = cc.Ctx.Input.Header("Authorization")
		}
		if strings.Contains(authorization, ";") {
			authorization = strings.Replace(authorization, ";", "$", 1)
		}
		if authorization == "" {
			strArr := strings.Split(uri, "?")
			for k, v := range strArr {
				fmt.Println(k, v)
			}
			if len(strArr) > 1 {
				authorization = strArr[1]
				authorization = strings.Replace(authorization, "Authorization", "authorization", -1)
			}
		}
		if authorization == "" {
			utils.FileLog.Error("authorization为空,未授权")
			cc.Ctx.ResponseWriter.WriteHeader(http.StatusUnauthorized)
			return
		}
		tokenStr := authorization
		tokenArr := strings.Split(tokenStr, "=")
		token := tokenArr[1]

		session, err := system.GetSysSessionByToken(token)
		if err != nil {
			if utils.IsErrNoRow(err) {
				utils.FileLog.Error("authorization已过期")
				cc.Ctx.ResponseWriter.WriteHeader(http.StatusUnauthorized)
				return
			}
			utils.FileLog.Error("authorization查询用户信息失败")
			cc.Ctx.ResponseWriter.WriteHeader(http.StatusBadRequest)
			return
		}
		if session == nil {
			utils.FileLog.Error("会话不存在")
			cc.Ctx.ResponseWriter.WriteHeader(http.StatusBadRequest)
			return
		}
		//校验token是否合法
		// JWT校验Token和Account
		account := utils.MD5(session.UserName)
		if !utils.CheckToken(account, token) {
			utils.FileLog.Error("authorization校验不合法")
			cc.Ctx.ResponseWriter.WriteHeader(http.StatusUnauthorized)
			return
		}
		if time.Now().After(session.ExpiredTime) {
			utils.FileLog.Error("authorization过期法")
			cc.Ctx.ResponseWriter.WriteHeader(http.StatusUnauthorized)
			return
		}
		admin, err := system.GetSysUserById(session.SysUserId)
		if err != nil {
			if utils.IsErrNoRow(err) {
				utils.FileLog.Error("权限不够")
				cc.Ctx.ResponseWriter.WriteHeader(http.StatusForbidden)
				return
			}
			utils.FileLog.Error("获取用户信息失败")
			cc.Ctx.ResponseWriter.WriteHeader(http.StatusBadRequest)
			return
		}
		if admin == nil {
			utils.FileLog.Error("权限不够")
			cc.Ctx.ResponseWriter.WriteHeader(http.StatusForbidden)
			return
		}
		//如果不是启用状态
		if admin.Enabled != 1 {
			utils.FileLog.Error("用户被禁用")
			cc.Ctx.ResponseWriter.WriteHeader(http.StatusForbidden)
			return
		}

		//接口权限校验
		roleId := admin.RoleId
		list, e := system.GetMenuButtonApisByRoleId(roleId)
		if e != nil {
			utils.FileLog.Error("接口权限查询出错", e)
			cc.Ctx.ResponseWriter.WriteHeader(http.StatusForbidden)
			return
		}
		var api string
		for _, v := range list {
			if v.Api != "" {
				api += v.Api + "&"
			}
		}
		api += "&" + models.BusinessConfMap["PublicApi"]
		//处理uri请求，去除前缀和参数
		api = strings.TrimRight(api, "&")
		uri = strings.Replace(uri, "/adminapi", "", 1)
		uris := strings.Split(uri, "?")
		uri = uris[0]
		//fmt.Println("uri:", uri)
		apis := strings.Split(api, "&")
		apiMap := make(map[string]bool, 0)
		for _, s := range apis {
			apiMap[s] = true
		}
		if !apiMap[uri] {
			utils.FileLog.Error("用户无权访问")
			cc.Ctx.ResponseWriter.WriteHeader(http.StatusForbidden)
			return
		}
		cc.SysUser = admin
	} else {
		utils.FileLog.Error("请求方法类型错误")
		cc.Ctx.ResponseWriter.WriteHeader(http.StatusBadRequest)
		return
	}
}

// ChatConnect @Title 知识库问答创建对话连接
// @Description 知识库问答创建对话连接
// @Success 101 {object} response.ListResp
// @router /chat/connect [get]
func (cc *ChatWsController) ChatConnect() {
	if !ws.Allow(cc.SysUser.AdminId, ws.CONNECT_LIMITER) {
		utils.FileLog.Error("WebSocket连接太频繁,主动拒绝链接")
		cc.Ctx.ResponseWriter.WriteHeader(http.StatusTooManyRequests)
		return
	}
	wsCon, err := webSocketHandler(cc.Ctx.ResponseWriter, cc.Ctx.Request)
	if err != nil {
		utils.FileLog.Error("WebSocket连接失败:", err)
		cc.Ctx.ResponseWriter.WriteHeader(http.StatusBadRequest)
		return
	}
	facade.AddSession(cc.SysUser.AdminId, wsCon)
}

// upGrader 用于将HTTP连接升级为WebSocket连接
var upGrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
	CheckOrigin: func(r *http.Request) bool {
		return true
	},
}

// WebSocketHandler 处理WebSocket连接
func webSocketHandler(w http.ResponseWriter, r *http.Request) (conn *websocket.Conn, err error) {
	conn, err = upGrader.Upgrade(w, r, nil)
	if err != nil {
		utils.FileLog.Error("升级协议失败:WebSocket:%s", err.Error())
		return
	}
	// 获取底层 TCP 连接并设置保活
	if tcpConn, ok := conn.NetConn().(*net.TCPConn); ok {
		_ = tcpConn.SetKeepAlive(true)
		_ = tcpConn.SetKeepAlivePeriod(ws.TcpTimeout)
		utils.FileLog.Info("TCP KeepAlive 已启用")
	}
	_ = conn.SetReadDeadline(time.Now().Add(ws.ReadTimeout))
	return
}