package pcsg

import (
	"eta/eta_email_analysis/global"
	"eta/eta_email_analysis/models/eta"
	"eta/eta_email_analysis/models/report"
	"eta/eta_email_analysis/services/oss"
	"eta/eta_email_analysis/utils"
	"eta/eta_email_analysis/utils/mail"
	"fmt"
	"github.com/google/uuid"
	"html"
	"io/fs"
	"os"
	"path"
	"strings"
	"sync"
	"time"
)

// 同步用户锁，防止重复同步，不管是全量还是增量，都是同一时间只能一个同步
var lockListenEmail sync.Mutex

func ListenMail() (err error) {
	lockListenEmail.Lock()
	// 目录创建
	_ = ensureDirExists(fmt.Sprintf("%s%s", global.CONFIG.Serve.StaticDir, `file`))

	mailMessageChan := make(chan mail.MailMessage, 5) // 创建一个通道，用于接收邮件消息
	mailMessageDoneChan := make(chan bool, 1)         // 创建一个通道，用于接收邮件消息

	fmt.Println(len(mailMessageChan))

	// 邮件监听后的处理函数
	go afterByListen(mailMessageChan, mailMessageDoneChan)

	fmt.Println("开始监听邮件")

	emailMessageUID, err := report.GetMaxOutsideReportByEmailMessageId()
	// 已经存在了，那么就返回
	if err != nil {
		global.FILE_LOG.Errorf("获取已入库的最大邮件id失败：%s", err.Error())
	}

	mailAddress := fmt.Sprintf("%s:%d", global.CONFIG.Email.Host, global.CONFIG.Email.Port)
	mail.ListenMail(mailAddress, global.CONFIG.Email.Folder, global.CONFIG.Email.UserName, global.CONFIG.Email.Password, global.CONFIG.Email.ReadBatchSize, emailMessageUID, mailMessageChan, mailMessageDoneChan)

	return
}

func afterByListen(mailMessageChan chan mail.MailMessage, mailMessageDoneChan chan bool) {
	defer func() {
		fmt.Println("监听读取结束")
		lockListenEmail.Unlock()
	}()
	for {
		select {
		case emailMessage := <-mailMessageChan:
			//fmt.Println("读取成功")
			//fmt.Println(emailMessage.Title)
			handleMailMessage(emailMessage)
		case <-time.After(10 * time.Second):
			//fmt.Println("监听超时了")
			break
		case <-mailMessageDoneChan:
			fmt.Println("读取完成一轮了")
			for len(mailMessageChan) > 0 {
				emailMessage := <-mailMessageChan
				handleMailMessage(emailMessage)
			}
			fmt.Println("结束了")
			return
		}
	}
}

func handleMailMessage(emailMessage mail.MailMessage) (err error) {
	defer func() {
		if err != nil {
			global.FILE_LOG.Errorf("邮件处理失败，邮件标题：%s，错误原因：%v", emailMessage.Title, err)
		}

		for _, v := range emailMessage.Resources {
			os.Remove(v)
		}

		for _, v := range emailMessage.Attachment {
			os.Remove(v)
		}
	}()
	//rootPath := `C:\Users\123\go\src\eta\eta_email_analysis\static\`
	ossClient := oss.NewOssClient()
	//fmt.Println(emailMessage.Title)
	outsideReportAttachmentList := make([]*report.OutsideReportAttachment, 0)

	emailMessageUID := int(emailMessage.Uid)
	outReport, err := report.GetOutsideReportByEmailMessageId(emailMessageUID)
	// 已经存在了，那么就返回
	if err == nil {
		global.FILE_LOG.Debugf("已存在，就不处理了,报告标题：%s", outReport.Title)
		return
	}
	fmt.Println("开始处理邮件，标题：", emailMessage.Title, "；邮件下标：", emailMessage.Uid)
	// sql报错，那么就返回
	if err != nil && !utils.IsErrNoRow(err) {
		return
	}
	// 已经存在了，那么就返回
	if outReport.OutsideReportID > 0 {
		return
	}

	for k, v := range emailMessage.Resources {
		randStr := utils.GetRandStringNoSpecialChar(28)
		ext := path.Ext(v)
		fileName := randStr + ext

		resourceUrl, tmpErr := ossClient.UploadFile(fileName, v, "")
		//os.Remove(v)
		if tmpErr != nil {
			global.FILE_LOG.Error(emailMessage.Title, "- 文件上传文件失败：", tmpErr)
			continue
		}
		tmpK := strings.Replace(k, "<", "cid:", -1)
		tmpK = strings.Replace(tmpK, ">", "", -1)

		emailMessage.Content = strings.Replace(emailMessage.Content, fmt.Sprint(tmpK, `"`), fmt.Sprint(resourceUrl, `"`), -1)
	}

	for name, v := range emailMessage.Attachment {
		var fileSize int64
		fileInfo, tmpErr := os.Stat(v)
		if tmpErr != nil {
			continue
		}
		fileSize = fileInfo.Size()

		randStr := utils.GetRandStringNoSpecialChar(28)
		ext := path.Ext(v)
		fileName := randStr + ext

		resourceUrl, tmpErr := ossClient.UploadFile(fileName, v, "")
		//defer os.Remove(v)
		if tmpErr != nil {
			global.FILE_LOG.Error(emailMessage.Title, " - 文件上传文件失败：", tmpErr)
			continue
		}
		outsideReportAttachmentList = append(outsideReportAttachmentList, &report.OutsideReportAttachment{
			OutsideReportAttachmentID: 0,
			OutsideReportID:           0,
			Title:                     name,
			URL:                       resourceUrl,
			CreateTime:                time.Now(),
			FileSize:                  fileSize,
		})
	}

	//fileName := fmt.Sprintf("%s%s.%s", rootPath, emailMessage.Title, "html")

	htmlEscapeBody := html.EscapeString(emailMessage.Content)
	//fmt.Println(htmlEscapeBody)
	//err = utils.SaveToFile([]byte(emailMessage.Content), fileName)
	//if err != nil {
	//	fmt.Println(fileName, "生成失败；err:", err)
	//}

	var sysUserId int
	sysUserName := emailMessage.FromEmail
	// 查找用户
	if emailMessage.From != `` {
		tmpEmailStrList := strings.Split(sysUserName, "<")
		if len(tmpEmailStrList) >= 2 {
			sysUserName = tmpEmailStrList[1]
			tmpEmailStrList = strings.Split(sysUserName, ">")
			if len(tmpEmailStrList) >= 2 {
				sysUserName = tmpEmailStrList[0]
			}
		}
		sysUser, tmpErr := eta.GetSysUserByEmail(sysUserName)
		if tmpErr != nil && !utils.IsErrNoRow(tmpErr) {
			err = tmpErr
			return
		}
		if tmpErr == nil {
			sysUserId = sysUser.AdminId
			sysUserName = sysUser.RealName
		}
	}

	reportUpdateTime := emailMessage.Date
	if reportUpdateTime.IsZero() {
		reportUpdateTime = time.Now()
	}
	reportInfo := &report.OutsideReport{
		OutsideReportID:  0,
		Source:           3,
		Title:            emailMessage.Title,
		Abstract:         "",
		ClassifyID:       0,
		ClassifyName:     "",
		Content:          htmlEscapeBody,
		SysUserID:        sysUserId,
		SysUserName:      sysUserName,
		EmailMessageUID:  emailMessageUID,
		ReportUpdateTime: reportUpdateTime,
		ModifyTime:       time.Now(),
		CreateTime:       time.Now(),
		ReportCode:       uuid.New().String(),
	}
	err = report.CreateOutsideReport(reportInfo, outsideReportAttachmentList)

	return
}
func ensureDirExists(dirPath string) error {
	info, err := os.Stat(dirPath)
	if err == nil {
		if info.IsDir() {
			return nil // 目录已存在
		}
		return fmt.Errorf("path '%s' exists but is not a directory", dirPath)
	}
	if os.IsNotExist(err) {
		return os.MkdirAll(dirPath, fs.ModePerm)
	}
	return err
}