package email

import (
	"context"
	"eta/eta_crawler/utils"
	"eta/eta_crawler/utils/mail"
	"fmt"
	"io/fs"
	"os"
	"strconv"
	"sync"
)

// 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(cont context.Context) (err error) {
	defer func() {
		lockListenEmail.Unlock()
		if err != nil {
			utils.FileLog.Error("监听邮件失败：%s", err.Error())
		}
	}()
	lockListenEmail.Lock()
	// 目录创建
	//_ = ensureDirExists(fmt.Sprintf("%s%s", utils.CoalFilePath, `file`))
	_ = ensureDirExists(utils.CoalFilePath)

	fmt.Println("开始监听邮件")
	utils.FileLog.Info("中国煤炭网开始监听邮件")
	var lastNday int
	if utils.CoalEmailNDay != "" {
		lastNday, _ = strconv.Atoi(utils.CoalEmailNDay)
		if err != nil {
			lastNday = 1
		}
	}
	if lastNday < 0 {
		lastNday = 1
	}

	utils.FileLog.Info("中国煤炭监听配置为：CoalEmailAddress:%s, CoalEmailFolder:%s, lastNday:%d", utils.CoalEmailAddress, utils.CoalEmailFolder, lastNday)
	var readBatch int
	if utils.CoalEmailReadBatch != "" {
		readBatch, err = strconv.Atoi(utils.CoalEmailReadBatch)
		if err != nil {
			readBatch = 10
			utils.FileLog.Warning("读取邮件 MtjhEmailReadBatch 配置失败：%s, 默认改为:%d", err.Error(), readBatch)
		}
	}
	mail.ListenMail(utils.CoalEmailAddress, utils.CoalEmailFolder, utils.CoalEmailUseName, utils.CoalEmailPassword, readBatch, lastNday)
	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
}