package biz

import (
	"context"
	"fmt"
	"io"
	"net/http"
	"os"
	"strings"
	"sync"

	"bkb-notify/internal/conf"

	"crypto/tls"
	"net/smtp"

	"github.com/go-kratos/kratos/v2/log"
	"github.com/jordan-wright/email"
)

// ErrUserNotFound is user not found.

// GreeterRepo is a Greater repo.
type EmailRepo interface {
	Send(context.Context, *Greeter) (*Greeter, error)
	FindByID(context.Context, int64) (*Greeter, error)
	ListByName(context.Context, string) ([]*Greeter, error)
	ListAll(context.Context) ([]*Greeter, error)
}

// EmailUsecase is a Greeter usecase.
type EmailUsecase struct {
	repo GreeterRepo
	log  *log.Helper
	c    *conf.App_Email
	wg   *sync.WaitGroup
	ch   chan int
}

// NewGreeterUsecase new a Greeter usecase.
func NewEmailUsecase(repo GreeterRepo, logger log.Logger, c *conf.App) *EmailUsecase {
	return &EmailUsecase{repo: repo, log: log.NewHelper(logger), c: c.Email, wg: &sync.WaitGroup{}, ch: make(chan int, 2)}
}

func (uc *EmailUsecase) SendEmail(to []string, subject string, body string, files []string) (err error) {
	from := uc.c.Account
	nickname := uc.c.Sender
	secret := uc.c.Password
	host := uc.c.Host
	port := uc.c.Port
	//port := 587
	isSSL := uc.c.IsSSL

	auth := smtp.PlainAuth("", from, secret, host)
	e := email.NewEmail()
	if nickname != "" {
		e.From = fmt.Sprintf("%s <%s>", nickname, from)
	} else {
		e.From = from
	}
	e.Subject = subject
	e.HTML = []byte(body)
	hostAddr := fmt.Sprintf("%s:%d", host, port)
	e.To = to

	// 创建../docs目录
	os.Mkdir("docs", os.ModePerm)
	// 添加附件
	for _, obsUrl := range files {
		// 下载素材
		resp, err := http.Get(obsUrl)
		if err != nil {
			log.Log(log.LevelError, "email", err)
		}
		defer resp.Body.Close()

		// 获取URL中的文件名
		segments := strings.Split(obsUrl, "/")
		filename := segments[len(segments)-1]

		// 创建一个文件用于保存下载的内容
		out, err := os.Create("docs/" + filename)
		if err != nil {
			log.Log(log.LevelError, "email", err)
		}
		defer out.Close()

		// 将响应流和文件流连接起来
		_, err = io.Copy(out, resp.Body)
		if err != nil {
			log.Log(log.LevelError, "email", err)
		}

		// Attach the file
		_, err = e.AttachFile("docs/" + filename)
		if err != nil {
			log.Log(log.LevelError, "email", err)
		}

		// 删除临时文件
		err = os.Remove("docs/" + filename)
		if err != nil {
			log.Log(log.LevelError, "email", err)
		}
	}

	if isSSL {
		err = e.SendWithTLS(hostAddr, auth, &tls.Config{ServerName: host})
	} else {
		err = e.Send(hostAddr, auth)
	}

	return err
}

func (uc *EmailUsecase) BulkSendEmail(to []string, subject string, body string) error {
	from := uc.c.Account
	nickname := uc.c.Sender
	secret := uc.c.Password
	host := uc.c.Host
	port := uc.c.Port
	//port := 587
	isSSL := uc.c.IsSSL

	auth := smtp.PlainAuth("", from, secret, host)
	e := email.NewEmail()
	if nickname != "" {
		e.From = fmt.Sprintf("%s <%s>", nickname, from)
	} else {
		e.From = from
	}
	e.Subject = subject
	e.HTML = []byte(body)
	hostAddr := fmt.Sprintf("%s:%d", host, port)
	var err error
	var errList []string
	for _, vTo := range to {

		e.To = []string{vTo}
		uc.ch <- 1
		uc.wg.Add(1)
		go func(ve *email.Email) {
			defer uc.wg.Done()

			if isSSL {
				err = e.SendWithTLS(hostAddr, auth, &tls.Config{ServerName: host})
			} else {
				err = e.Send(hostAddr, auth)
			}
			if err != nil {
				errList = append(errList, e.To...)
			}
			<-uc.ch
		}(e)
	}
	uc.wg.Wait()
	if len(errList) > 0 {
		return fmt.Errorf(fmt.Sprintf("发送失败%d条：%s", len(errList), strings.Join(errList[:3], ",")))
	}

	return err
}