// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
//go:build plus

package tasks

import (
	"fmt"
	teaconst "github.com/TeaOSLab/EdgeAPI/internal/const"
	"github.com/TeaOSLab/EdgeAPI/internal/db/models"
	"github.com/TeaOSLab/EdgeAPI/internal/goman"
	"github.com/TeaOSLab/EdgeAPI/internal/remotelogs"
	"github.com/TeaOSLab/EdgeAPI/internal/senders/mediasenders"
	"github.com/TeaOSLab/EdgeCommon/pkg/userconfigs"
	"github.com/iwind/TeaGo/Tea"
	"github.com/iwind/TeaGo/dbs"
	"github.com/iwind/TeaGo/logs"
	"github.com/iwind/TeaGo/types"
	"net/mail"
	"strings"
	"time"
)

func init() {
	dbs.OnReadyDone(func() {
		goman.New(func() {
			NewUserEmailVerificationTask(30 * time.Second).Start()
		})
	})
}

// UserEmailVerificationTask 用户邮件验证任务
type UserEmailVerificationTask struct {
	BaseTask

	duration time.Duration
}

func NewUserEmailVerificationTask(duration time.Duration) *UserEmailVerificationTask {
	return &UserEmailVerificationTask{
		duration: duration,
	}
}

func (this *UserEmailVerificationTask) Start() {
	var ticker = time.NewTicker(this.duration)
	for range ticker.C {
		err := this.Loop()
		if err != nil {
			remotelogs.Error("UserEmailVerificationTask", err.Error())
		}
	}
}

func (this *UserEmailVerificationTask) Loop() error {
	if !this.IsPrimaryNode() {
		return nil
	}

	var tx *dbs.Tx

	// 注册设置
	registerConfig, err := models.SharedSysSettingDAO.ReadUserRegisterConfig(tx)
	if err != nil {
		return err
	}
	if !registerConfig.EmailVerification.IsOn {
		return nil
	}

	// 删除过期的认证
	var life = registerConfig.EmailVerification.Life
	if life <= 0 {
		life = userconfigs.EmailVerificationDefaultLife
	}
	var lifeDays = life / 86400
	if lifeDays <= 0 {
		lifeDays = 1
	}
	err = models.SharedUserEmailVerificationDAO.DeleteExpiredVerifications(tx, lifeDays)
	if err != nil {
		return err
	}

	// 检查邮件设置
	senderConfig, err := models.SharedSysSettingDAO.ReadUserSenderConfig(tx)
	if err != nil {
		return err
	}
	var verifyEmail = senderConfig.VerifyEmail
	if verifyEmail == nil {
		// TODO 思考是否需要用户没有设置
		return nil
	}
	if !verifyEmail.IsOn {
		return nil
	}

	// 查找等待发送的认证
	verifications, err := models.SharedUserEmailVerificationDAO.ListSendingVerifications(tx, 10 /** 单次10封 **/)
	if err != nil {
		return err
	}
	if len(verifications) == 0 {
		return nil
	}

	// 准备邮件中的参数
	productName, err := models.SharedSysSettingDAO.ReadProductName(tx)
	if err != nil {
		return err
	}
	if len(productName) == 0 {
		productName = teaconst.ProductNameZH
	}

	userNodeAddr, err := models.SharedUserNodeDAO.FindUserNodeAccessAddr(tx)
	if err != nil {
		return err
	}

	var mailInfos = []*mediasenders.MailInfo{}
	var verificationIds = []int64{}
	for _, verification := range verifications {
		// 检查时间
		if int64(verification.CreatedAt) < time.Now().Unix()-int64(life) {
			// 已过期，设置为已发送
			err = models.SharedUserEmailVerificationDAO.DeleteVerification(tx, int64(verification.Id))
			if err != nil {
				return err
			}

			continue
		}

		_, err = mail.ParseAddress(verification.Email)
		if err != nil {
			// 邮件已发送，设置为已发送
			err = models.SharedUserEmailVerificationDAO.DeleteVerification(tx, int64(verification.Id))
			if err != nil {
				return err
			}
			continue
		}

		// 标题和内容
		var subject = registerConfig.EmailVerification.Subject
		subject = strings.ReplaceAll(subject, "${product.name}", productName)

		var body = registerConfig.EmailVerification.Body
		body = strings.ReplaceAll(body, "${product.name}", productName)
		body = strings.ReplaceAll(body, "${url.home}", userNodeAddr)
		body = strings.ReplaceAll(body, "${url.verify}", userNodeAddr+"/email/verify/"+verification.Code)

		mailInfos = append(mailInfos, &mediasenders.MailInfo{
			To:      verification.Email,
			Subject: subject,
			Body:    body,
		})

		if Tea.IsTesting() {
			logs.Println("sending verification mail to :", verification.Email)
		}

		verificationIds = append(verificationIds, int64(verification.Id))
	}
	if len(mailInfos) == 0 {
		return nil
	}

	// 发送
	var mailSender = mediasenders.NewEmailMedia()
	mailSender.Protocol = verifyEmail.Protocol
	mailSender.SMTP = verifyEmail.SMTPHost + ":" + types.String(verifyEmail.SMTPPort)
	mailSender.Username = verifyEmail.Username
	mailSender.Password = verifyEmail.Password
	mailSender.From = verifyEmail.FromEmail
	mailSender.FromName = verifyEmail.FromName
	err = mailSender.SendMails(mailInfos, productName)
	if err != nil {
		return fmt.Errorf("send mail failed: %w", err)
	}

	// 设置为已发送
	for _, verificationId := range verificationIds {
		err = models.SharedUserEmailVerificationDAO.UpdateVerificationIsSent(tx, verificationId)
		if err != nil {
			return err
		}
	}

	return nil
}