package wechat

import (
	"code.gitea.io/gitea/modules/redis/redis_client"
	"code.gitea.io/gitea/modules/redis/redis_key"
	"encoding/json"
	"encoding/xml"
	"strings"
	"time"
)

//<xml>
//  <ToUserName><![CDATA[toUser]]></ToUserName>
//  <FromUserName><![CDATA[FromUser]]></FromUserName>
//  <CreateTime>123456789</CreateTime>
//  <MsgType><![CDATA[event]]></MsgType>
//  <Event><![CDATA[SCAN]]></Event>
//  <EventKey><![CDATA[SCENE_VALUE]]></EventKey>
//  <Ticket><![CDATA[TICKET]]></Ticket>
//</xml>
type WechatEvent struct {
	ToUserName   string
	FromUserName string
	CreateTime   int64
	MsgType      string
	Event        string
	EventKey     string
	Ticket       string
}

type EventReply struct {
	XMLName      xml.Name `xml:"xml"`
	ToUserName   string
	FromUserName string
	CreateTime   int64
	MsgType      string
	Content      string
}

func HandleSubscribeEvent(we WechatEvent) string {
	eventKey := we.EventKey
	if eventKey == "" {
		return ""
	}
	sceneStr := strings.TrimPrefix(eventKey, "qrscene_")
	key := redis_key.WechatBindingUserIdKey(sceneStr)
	val, _ := redis_client.Get(key)
	if val == "" {
		return ""
	}
	qrCache := new(QRCode4BindCache)
	json.Unmarshal([]byte(val), qrCache)
	if qrCache.Status == BIND_STATUS_UNBIND {
		err := BindWechat(qrCache.UserId, we.FromUserName)
		if err != nil {
			if err, ok := err.(WechatBindError); ok {
				return err.Reply
			}
			return BIND_REPLY_FAILED_DEFAULT
		}
		qrCache.Status = BIND_STATUS_BOUND
		jsonStr, _ := json.Marshal(qrCache)
		redis_client.Setex(redis_key.WechatBindingUserIdKey(sceneStr), string(jsonStr), 60*time.Second)
	}

	return BIND_REPLY_SUCCESS
}