/*
@Time : 2020/6/2 11:13
@Author : wayos
@File : gomail.go
@Software: bill-service
*/
package mail

import (
	"crypto/tls"
	"gopkg.in/gomail.v2"
	"strings"
	"sync"
)

// Msg
type Msg struct {
	Name        string
	User        string
	Password    string
	Host        string
	Port        int
	SendTo      []string
	Subject     string
	Body        string
	ContentType string
}

var (
	// 邮件发送对象
	mail *gomail.Message
	// 邮件锁
	lock *sync.Mutex
)

/*邮件内容类型*/
const (
	// 文本内容
	TextMail string = `text/plain`
	// 前端内容
	HtmlMail string = `text/html`
)

func init() {
	mail = gomail.NewMessage()
	lock = new(sync.Mutex)
}

// SendMail
func SendMail(msg *Msg) error {
	lock.Lock()
	defer lock.Unlock()
	defer mail.Reset()
	mail.SetHeader("From", mail.FormatAddress(msg.User, msg.Name))
	mail.SetHeader("To", msg.SendTo...)
	mail.SetHeader("Subject", msg.Subject)
	mail.SetBody(parseType(msg.ContentType), msg.Body)
	d := gomail.NewDialer(msg.Host, msg.Port, msg.User, msg.Password)
	d.TLSConfig = &tls.Config{InsecureSkipVerify: true}
	return d.DialAndSend(mail)
}

// parseType
func parseType(mailType string) string {
	var val string
	mailType = strings.ToLower(mailType)
	switch mailType {
	case HtmlMail:
		val = HtmlMail
	default:
		val = TextMail
	}
	return val
}