<?php

/*
 * This file is part of the Monolog package.
 *
 * (c) Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Monolog\Handler;

use Monolog\Logger;

/**
 * SwiftMailerHandler uses Swift_Mailer to send the emails
 *
 * @author Gyula Sallai
 */
class SwiftMailerHandler extends MailHandler
{
    protected $mailer;
    protected $message;

    /**
     * @param \Swift_Mailer           $mailer  The mailer to use
     * @param callable|\Swift_Message $message An example message for real messages, only the body will be replaced
     * @param integer                 $level   The minimum logging level at which this handler will be triggered
     * @param Boolean                 $bubble  Whether the messages that are handled can bubble up the stack or not
     */
    public function __construct(\Swift_Mailer $mailer, $message, $level = Logger::ERROR, $bubble = true)
    {
        parent::__construct($level, $bubble);

        $this->mailer = $mailer;
        $this->message = $message;
    }

    /**
     * {@inheritdoc}
     */
    protected function send($content, array $records)
    {
        $this->mailer->send($this->buildMessage($content));
    }

    /**
     * Creates instance of Swift_Message to be sent
     *
     * @param string $content
     * @return \Swift_Message
     */
    protected function buildMessage($content)
    {
        $message = null;
        if ($this->message instanceof \Swift_Message) {
            $message = clone $this->message;
        } else if (is_callable($this->message)) {
            $message = call_user_func($this->message);
        }

        if (!$message instanceof \Swift_Message) {
            throw new \InvalidArgumentException('Could not resolve message as instance of Swift_Message or a callable returning it');
        }

        $message->setBody($content);
        $message->setDate(time());

        return $message;
    }
}