package main

import (
	"context"
	"fmt"
	"net/http"
	"os"
	"os/signal"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/open-dingtalk/dingtalk-stream-sdk-go/chatbot"
	"github.com/open-dingtalk/dingtalk-stream-sdk-go/client"

	"github.com/eryajf/chatgpt-dingtalk/pkg/dingbot"
	"github.com/eryajf/chatgpt-dingtalk/pkg/logger"
	"github.com/eryajf/chatgpt-dingtalk/pkg/process"
	"github.com/eryajf/chatgpt-dingtalk/public"
)

func init() {
	// 初始化加载配置，数据库，模板等
	public.InitSvc()
	// 指定日志等级
	logger.InitLogger(public.Config.LogLevel)
}

func main() {
	if public.Config.RunMode == "http" {
		StartHttp()
	} else {
		for _, credential := range public.Config.Credentials {
			StartStream(credential.ClientID, credential.ClientSecret)
		}
		logger.Info("🚀 The Server Is Running On Stream Mode")
		select {}
	}
}

type ChatReceiver struct {
	clientId     string
	clientSecret string
}

func NewChatReceiver(clientId, clientSecret string) *ChatReceiver {
	return &ChatReceiver{
		clientId:     clientId,
		clientSecret: clientSecret,
	}
}

// 启动为 stream 模式
func StartStream(clientId, clientSecret string) {
	receiver := NewChatReceiver(clientId, clientSecret)
	cli := client.NewStreamClient(client.WithAppCredential(client.NewAppCredentialConfig(clientId, clientSecret)))

	//注册callback类型的处理函数
	cli.RegisterChatBotCallbackRouter(receiver.OnChatBotMessageReceived)

	err := cli.Start(context.Background())
	if err != nil {
		logger.Fatal("strar stream failed: %v\n", err)
	}
	defer cli.Close()
}

// OnChatBotMessageReceived 简单的应答机器人实现
func (r *ChatReceiver) OnChatBotMessageReceived(ctx context.Context, data *chatbot.BotCallbackDataModel) ([]byte, error) {
	msgObj := dingbot.ReceiveMsg{
		ConversationID: data.ConversationId,
		AtUsers: []struct {
			DingtalkID string "json:\"dingtalkId\""
		}{},
		ChatbotUserID:             data.ChatbotUserId,
		MsgID:                     data.MsgId,
		SenderNick:                data.SenderNick,
		IsAdmin:                   data.IsAdmin,
		SenderStaffId:             data.SenderStaffId,
		SessionWebhookExpiredTime: data.SessionWebhookExpiredTime,
		CreateAt:                  data.CreateAt,
		ConversationType:          data.ConversationType,
		SenderID:                  data.SenderId,
		ConversationTitle:         data.ConversationTitle,
		IsInAtList:                data.IsInAtList,
		SessionWebhook:            data.SessionWebhook,
		Text:                      dingbot.Text(data.Text),
		RobotCode:                 "",
		Msgtype:                   dingbot.MsgType(data.Msgtype),
	}
	clientId := r.clientId
	var c gin.Context
	c.Set(public.DingTalkClientIdKeyName, clientId)
	DoRequest(msgObj, &c)

	return []byte(""), nil
}

func StartHttp() {
	app := gin.Default()
	app.POST("/", func(c *gin.Context) {
		var msgObj dingbot.ReceiveMsg
		err := c.Bind(&msgObj)
		if err != nil {
			return
		}
		DoRequest(msgObj, c)
	})
	// 解析生成后的图片
	app.GET("/images/:filename", func(c *gin.Context) {
		filename := c.Param("filename")
		c.File("./data/images/" + filename)
	})
	// 解析生成后的历史聊天
	app.GET("/history/:filename", func(c *gin.Context) {
		filename := c.Param("filename")
		c.File("./data/chatHistory/" + filename)
	})
	// 直接下载文件
	app.GET("/download/:filename", func(c *gin.Context) {
		filename := c.Param("filename")
		c.Header("Content-Disposition", "attachment; filename="+filename)
		c.Header("Content-Type", "application/octet-stream")
		c.File("./data/chatHistory/" + filename)
	})
	// 服务器健康检测
	app.GET("/", func(c *gin.Context) {
		c.JSON(200, gin.H{
			"status":  "ok",
			"message": "🚀 欢迎使用钉钉机器人 🤖",
		})
	})
	port := ":" + public.Config.Port
	srv := &http.Server{
		Addr:    port,
		Handler: app,
	}

	// Initializing the server in a goroutine so that
	// it won't block the graceful shutdown handling below
	go func() {
		logger.Info("🚀 The HTTP Server is running on", port)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			logger.Fatal("listen: %s\n", err)
		}
	}()

	// Wait for interrupt signal to gracefully shutdown the server with
	// a timeout of 5 seconds.
	quit := make(chan os.Signal, 1)
	// kill (no param) default send syscall.SIGTERM
	// kill -2 is syscall.SIGINT
	// kill -9 is syscall.SIGKILL but can't be catch, so don't need add it
	// signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	signal.Notify(quit, os.Interrupt)
	<-quit
	logger.Info("Shutting down server...")

	// 5秒后强制退出
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := srv.Shutdown(ctx); err != nil {
		logger.Fatal("Server forced to shutdown:", err)
	}
	logger.Info("Server exiting!")
}

func DoRequest(msgObj dingbot.ReceiveMsg, c *gin.Context) {
	// 先校验回调是否合法
	if public.Config.RunMode == "http" {
		clientId, checkOk := public.CheckRequestWithCredentials(c.GetHeader("timestamp"), c.GetHeader("sign"))
		if !checkOk {
			logger.Warning("该请求不合法，可能是其他企业或者未经允许的应用调用所致，请知悉！")
			return
		}
		// 通过 context 传递 OAuth ClientID，用于后续流程中调用钉钉OpenAPI
		c.Set(public.DingTalkClientIdKeyName, clientId)
	}
	// 再校验回调参数是否有价值
	if msgObj.Text.Content == "" || msgObj.ChatbotUserID == "" {
		logger.Warning("从钉钉回调过来的内容为空，根据过往的经验，或许重新创建一下机器人，能解决这个问题")
		return
	}
	// 去除问题的前后空格
	msgObj.Text.Content = strings.TrimSpace(msgObj.Text.Content)
	if public.JudgeSensitiveWord(msgObj.Text.Content) {
		logger.Info(fmt.Sprintf("🙋 %s提问的问题中包含敏感词汇，userid：%#v，消息: %#v", msgObj.SenderNick, msgObj.SenderStaffId, msgObj.Text.Content))
		_, err := msgObj.ReplyToDingtalk(string(dingbot.MARKDOWN), "**🤷 抱歉，您提问的问题中包含敏感词汇，请审核自己的对话内容之后再进行！**")
		if err != nil {
			logger.Warning(fmt.Errorf("send message error: %v", err))
			return
		}
		return
	}
	// 打印钉钉回调过来的请求明细，调试时打开
	logger.Debug(fmt.Sprintf("dingtalk callback parameters: %#v", msgObj))

	if public.Config.ChatType != "0" && msgObj.ConversationType != public.Config.ChatType {
		logger.Info(fmt.Sprintf("🙋 %s使用了禁用的聊天方式", msgObj.SenderNick))
		_, err := msgObj.ReplyToDingtalk(string(dingbot.MARKDOWN), "**🤷 抱歉，管理员禁用了这种聊天方式，请选择其他聊天方式与机器人对话！**")
		if err != nil {
			logger.Warning(fmt.Errorf("send message error: %v", err))
			return
		}
		return
	}

	// 查询群ID，发送指令后，可通过查看日志来获取
	if msgObj.ConversationType == "2" && msgObj.Text.Content == "群ID" {
		if msgObj.RobotCode == "normal" {
			logger.Info(fmt.Sprintf("🙋 outgoing机器人 在『%s』群的ConversationID为: %#v", msgObj.ConversationTitle, msgObj.ConversationID))
		} else {
			logger.Info(fmt.Sprintf("🙋 企业内部机器人 在『%s』群的ConversationID为: %#v", msgObj.ConversationTitle, msgObj.ConversationID))
		}
		return
	}

	// 不在允许群组，不在允许用户（包括在黑名单），满足任一条件，拒绝会话；管理员不受限制
	if msgObj.ConversationType == "2" && !public.JudgeGroup(msgObj.ConversationID) && !public.JudgeAdminUsers(msgObj.SenderStaffId) && msgObj.SenderStaffId != "" {
		logger.Info(fmt.Sprintf("🙋『%s』群组未被验证通过，群ID: %#v，userid：%#v, 昵称: %#v，消息: %#v", msgObj.ConversationTitle, msgObj.ConversationID, msgObj.SenderStaffId, msgObj.SenderNick, msgObj.Text.Content))
		_, err := msgObj.ReplyToDingtalk(string(dingbot.MARKDOWN), "**🤷 抱歉，该群组未被认证通过，无法使用机器人对话功能。**\n>如需继续使用，请联系管理员申请访问权限。")
		if err != nil {
			logger.Warning(fmt.Errorf("send message error: %v", err))
			return
		}
		return
	} else if !public.JudgeUsers(msgObj.SenderStaffId) && !public.JudgeAdminUsers(msgObj.SenderStaffId) && msgObj.SenderStaffId != "" {
		logger.Info(fmt.Sprintf("🙋 %s身份信息未被验证通过，userid：%#v，消息: %#v", msgObj.SenderNick, msgObj.SenderStaffId, msgObj.Text.Content))
		_, err := msgObj.ReplyToDingtalk(string(dingbot.MARKDOWN), "**🤷 抱歉，您的身份信息未被认证通过，无法使用机器人对话功能。**\n>如需继续使用，请联系管理员申请访问权限。")
		if err != nil {
			logger.Warning(fmt.Errorf("send message error: %v", err))
			return
		}
		return
	}
	if len(msgObj.Text.Content) == 0 || msgObj.Text.Content == "帮助" {
		// 欢迎信息
		_, err := msgObj.ReplyToDingtalk(string(dingbot.MARKDOWN), public.Config.Help)
		if err != nil {
			logger.Warning(fmt.Errorf("send message error: %v", err))
			return
		}
	} else {
		logger.Info(fmt.Sprintf("🙋 %s发起的问题: %#v", msgObj.SenderNick, msgObj.Text.Content))
		// 除去帮助之外的逻辑分流在这里处理
		switch {
		case strings.HasPrefix(msgObj.Text.Content, "#图片"):
			err := process.ImageGenerate(c, &msgObj)
			if err != nil {
				logger.Warning(fmt.Errorf("process request: %v", err))
				return
			}
			return
		case strings.HasPrefix(msgObj.Text.Content, "#查对话"):
			err := process.SelectHistory(&msgObj)
			if err != nil {
				logger.Warning(fmt.Errorf("process request: %v", err))
				return
			}
			return
		case strings.HasPrefix(msgObj.Text.Content, "#域名"):
			err := process.DomainMsg(&msgObj)
			if err != nil {
				logger.Warning(fmt.Errorf("process request: %v", err))
				return
			}
			return
		case strings.HasPrefix(msgObj.Text.Content, "#证书"):
			err := process.DomainCertMsg(&msgObj)
			if err != nil {
				logger.Warning(fmt.Errorf("process request: %v", err))
				return
			}
			return
		default:
			var err error
			msgObj.Text.Content, err = process.GeneratePrompt(msgObj.Text.Content)
			// err不为空：提示词之后没有文本 -> 直接返回提示词所代表的内容
			if err != nil {
				_, err = msgObj.ReplyToDingtalk(string(dingbot.TEXT), msgObj.Text.Content)
				if err != nil {
					logger.Warning(fmt.Errorf("send message error: %v", err))
					return
				}
				return
			}
			err = process.ProcessRequest(&msgObj)
			if err != nil {
				logger.Warning(fmt.Errorf("process request: %v", err))
				return
			}
			return
		}
	}
}