package logic

import (
	"context"
	"encoding/json"
	"fusenapi/model/gmodel"
	"fusenapi/server/feishu-sync/internal/svc"
	"fusenapi/utils/feishu"
	"github.com/zeromicro/go-zero/core/logx"
	"io"
	"net/http"
	"strconv"
	"time"
)

type WebhookLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewWebhookLogic(ctx context.Context, svcCtx *svc.ServiceContext) *WebhookLogic {
	return &WebhookLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

type EncryptWebhookMsg struct {
	Encrypt string `json:"encrypt"` //加密的消息
}
type WebhookMsg struct {
	Type      string                 `json:"type"`
	Challenge string                 `json:"challenge"`
	Header    map[string]interface{} `json:"header"`
}

// webhook消息事件header(body参数)基础信息
type BaseWebhookMsgHeaderType struct {
	EventId    string `json:"event_id"`    //事件id(可作为消息唯一性确认)
	EventType  string `json:"event_type"`  //事件类型
	CreateTime string `json:"create_time"` //创建时间
	Token      string `json:"token"`       //事件token
	AppId      string `json:"app_id"`      //app id
	TenantKey  string `json:"tenant_key"`  //租户key
}

func (l *WebhookLogic) Webhook(w http.ResponseWriter, r *http.Request) {
	bodyBytes, err := io.ReadAll(r.Body)
	if err != nil {
		logx.Error("读取请求body失败", err)
		return
	}
	defer r.Body.Close()
	//计算签名
	timestamp := r.Header.Get("X-Lark-Request-Timestamp")
	nonce := r.Header.Get("X-Lark-Request-Nonce")
	signature := r.Header.Get("X-Lark-Signature")
	sign := feishu.CalculateFeiShuWebhookSignature(timestamp, nonce, l.svcCtx.Config.FeiShu.EncryptKey, bodyBytes)
	if signature != sign {
		logx.Error("非法的消息，签名验证不通过", sign, "====", signature)
		return
	}
	var encryptMsg EncryptWebhookMsg
	if err = json.Unmarshal(bodyBytes, &encryptMsg); err != nil {
		logx.Error("反序列化body失败", err, "body数据:", string(bodyBytes))
		return
	}
	if encryptMsg.Encrypt == "" {
		logx.Error("消息加密信息是空的")
		return
	}
	//解密
	realMsgBytes, err := feishu.DecryptFeiShuWebhookMsg(encryptMsg.Encrypt, l.svcCtx.Config.FeiShu.EncryptKey)
	if err != nil {
		logx.Error(err)
		return
	}
	//如果只是验证http连接的消息
	var webhookMsg WebhookMsg
	if err = json.Unmarshal(realMsgBytes, &webhookMsg); err != nil {
		logx.Error("反序列化请求body失败", err, "解密数据:", string(realMsgBytes))
		return
	}
	//验证连接(直接返回)
	if webhookMsg.Type == "url_verification" {
		challengeRsp := map[string]string{
			"challenge": webhookMsg.Challenge,
		}
		b, _ := json.Marshal(challengeRsp)
		w.Write(b)
		return
	}
	bodyHeaderByte, err := json.Marshal(webhookMsg.Header)
	if err != nil {
		logx.Error("序列化请求体header失败:", err)
		return
	}
	var msgHeader BaseWebhookMsgHeaderType
	if err = json.Unmarshal(bodyHeaderByte, &msgHeader); err != nil {
		logx.Error("反序列化请求体中的header失败", err)
		return
	}
	httpHeaderBytes, _ := json.Marshal(r.Header)
	httpHeaderStr := string(httpHeaderBytes)
	//解密后的数据
	decryptMsgStr := string(realMsgBytes)
	feiShuMsgCreateTimeInt64, err := strconv.ParseInt(msgHeader.CreateTime, 10, 64)
	if err != nil {
		logx.Error("解析消息时间错误:", err)
		return
	}
	feiShuMsgCreateTime := time.UnixMilli(feiShuMsgCreateTimeInt64)
	now := time.Now().UTC()
	//把事件加入日志
	err = l.svcCtx.AllModels.FsFeishuWebhookLog.Create(l.ctx, &gmodel.FsFeishuWebhookLog{
		AppId:       &msgHeader.AppId,
		EventId:     &msgHeader.EventId,
		EventType:   &msgHeader.EventType,
		HttpHeader:  &httpHeaderStr,
		Data:        &encryptMsg.Encrypt,
		DecryptData: &decryptMsgStr,
		MsgCtime:    &feiShuMsgCreateTime,
		Ctime:       &now,
	})
	if err != nil {
		logx.Error("保存webhook消息日志失败:", err)
	}
	switch msgHeader.EventType {
	case "contact.department.created_v3": //部门新建
	case "contact.department.deleted_v3": //部门删除
	case "contact.department.updated_v3": //部门信息变化
	case "contact.employee_type_enum.actived_v3": //启动人员类型事件
	case "contact.employee_type_enum.created_v3": //新建人员类型事件
	case "contact.employee_type_enum.deactivated_v3": //停用人员类型事件
	case "contact.employee_type_enum.deleted_v3": //删除人员类型事件
	case "contact.employee_type_enum.updated_v3": //修改人员类型名称事件
	case "contact.user.created_v3": //员工入职
		err = l.OnUserChange(realMsgBytes)
	case "contact.user.deleted_v3": //员工离职
		err = l.OnUserChange(realMsgBytes)
	case "contact.user.updated_v3": //员工信息变化
		err = l.OnUserChange(realMsgBytes)
	}
	if err != nil {
		logx.Error("处理事件错误:", err)
	}
	return
}