package vain

import (
	"bytes"
	"fmt"
	"net/mail"
	"net/smtp"
)

type Mailer interface {
	Send(to mail.Address, msg string) error
}

func NewEmail(from, host string, port int) (*Email, error) {
	if _, err := mail.ParseAddress(from); err != nil {
		return nil, fmt.Errorf("can't parse an email address for 'from': %v", err)
	}
	r := &Email{
		host: host,
		port: port,
		from: from,
	}
	return r, nil
}

type Email struct {
	host string
	port int
	from string
}

func (e Email) Send(to mail.Address, msg string) error {
	c, err := smtp.Dial(fmt.Sprintf("%s:%d", e.host, e.port))
	if err != nil {
		return fmt.Errorf("couldn't dial mail server: %v", err)
	}
	defer c.Close()
	if err := c.Mail(e.from); err != nil {
		return err
	}
	if err := c.Rcpt(to.String()); err != nil {
		return err
	}
	wc, err := c.Data()
	if err != nil {
		return fmt.Errorf("problem sending mail: %v", err)
	}
	buf := bytes.NewBufferString("Subject: your api key\n\n" + msg)
	buf.WriteTo(wc)
	if err := c.Quit(); err != nil {
		return nil
	}
	return err
}