// Copyright 2019 getensh.com. All rights reserved.
// Use of this source code is governed by getensh.com.

package event

import (
	"context"
	"encoding/json"
	"fmt"
	"gorm.io/gorm"
	"property-garden/errors"
	dbmodel "property-garden/model"
	pb_v1 "property-garden/pb/v1"
	"property-garden/utils"
	"strings"
	"time"

	"git.getensh.com/common/gopkgs/database"
	"git.getensh.com/common/gopkgs/logger"
	"go.uber.org/zap"
	"google.golang.org/grpc/status"
)


func checkEventSignAddParam(req *pb_v1.EventSignAddRequest) error {
	switch {
	case req.GardenId < 1:
		return status.Error(10003, "小区不能为空")
	case req.Name == "":
		return status.Error(10003, "姓名不能为空")
	case req.Phone == "":
		return status.Error(10003, "电话不能为空")
	case req.Count < 1:
		return status.Error(10003, "报名人数不能为空")
	case req.HouseholdUid < 1:
		return status.Error(10003, "住户id不能为空")
	case req.EventId < 1:
		return status.Error(10003, "活动不能为空")

	}
	return nil

}



//
func EventSignAdd(ctx context.Context, req *pb_v1.EventSignAddRequest) (reply *pb_v1.EventSignAddReply, err error) {

	reply = &pb_v1.EventSignAddReply{}

	// 捕获各个task中的异常并返回给调用者
	defer func() {
		if r := recover(); r != nil {
			err = fmt.Errorf("%+v", r)
			e := &status.Status{}
			if er := json.Unmarshal([]byte(err.Error()), e); er != nil {
				logger.Error("err",
					zap.String("system_err", err.Error()),
					zap.Stack("stacktrace"))
			}
		}
	}()
	// 参数检查
	err = checkEventSignAddParam(req)
	if err != nil {
		return nil, err
	}
	dbname := utils.GetGardenDbName(req.GardenId)

	now := time.Now()
	// 乐观锁方案，先直接更新和插入，最后查询是否超过人数限制
	p := dbmodel.NewEvent(dbname)
	where := map[string]interface{}{
		"id":req.EventId,
	}



	values := map[string]interface{}{
		"people_count":gorm.Expr("people_count + ?", req.Count),
	}
	db := database.DB().Begin()

	defer func() {
		if err != nil {
			db.Rollback()
		}
	}()

	err = p.FindForUpdate(db, where)
	if err != nil {
		if err != gorm.ErrRecordNotFound {
			return nil, errors.DataBaseError
		}
	}
	if p.ID == 0 {
		return nil, errors.ErrRecordNotFound
	}
	if p.PeopleCount + req.Count > p.PeopleLimit {
		return nil, status.Error(10003, "人数已达上限")
	}

	// 更新活动报名总人数
	err = p.Update(db, where, values)
	if err != nil {
		return nil, errors.DataBaseError
	}

	// 插入报名记录
	sign := dbmodel.TEventSign{
		EventId:req.EventId,
		HouseholdUid:req.HouseholdUid,
		SignCount:req.Count,
		Name:req.Name,
		Phone:req.Phone,
		Comment:req.Comment,
		CreatedAt:now,
		UpdatedAt:now,
	}
	sign.SetTable(dbname)
	err = sign.Insert(db)
	if err != nil {
		if strings.Contains(strings.ToLower(err.Error()), "duplicate") {
			return nil, status.Error(10003, "不能重复报名")
		}
		return nil, errors.DataBaseError
	}

	db.Commit()

	return reply, nil
}