package mail

import (
	"crypto/tls"
	"fmt"
	"net/smtp"
	"strings"
)

// Send 寄送信件
func Send(host string, port int, username, password, mailto, subject, content string) error {
	conn, err := tls.Dial("tcp", fmt.Sprintf("%s:%d", host, port), &tls.Config{InsecureSkipVerify: true, ServerName: "smtp.gmail.com"})
	if err != nil {
		return err
	}

	client, err := smtp.NewClient(conn, "smtp.gmail.com")
	if err != nil {
		return err
	}

	if err = client.Auth(smtp.PlainAuth("", username, password, host)); err != nil {
		return err
	}

	if err = client.Mail(username); err != nil {
		return err
	}

	if err = client.Rcpt(mailto); err != nil {
		return err
	}

	w, err := client.Data()
	if err != nil {
		return err
	}

	messages := []string{
		"Content-Type: text/html; charset=\"UTF-8\";",
		fmt.Sprintf("From: %s", username),
		fmt.Sprintf("To: %s", mailto),
		fmt.Sprintf("Subject: %s", subject),
		content,
	}

	if _, err = w.Write([]byte(strings.Join(messages, "\r\n"))); err != nil {
		return err
	}

	if err = w.Close(); err != nil {
		return err
	}

	return client.Quit()
}