<?php namespace Illuminate\Mail\Transport;

use Swift_Transport;
use GuzzleHttp\Client;
use Swift_Mime_Message;
use GuzzleHttp\Post\PostFile;
use Swift_Events_EventListener;

class MailgunTransport implements Swift_Transport {

	/**
	 * The Mailgun API key.
	 *
	 * @var string
	 */
	protected $key;

	/**
	 * The Mailgun domain.
	 *
	 * @var string
	 */
	protected $domain;

	/**
	 * THe Mailgun API end-point.
	 *
	 * @var string
	 */
	protected $url;

	/**
	 * Create a new Mailgun transport instance.
	 *
	 * @param  string  $key
	 * @param  string  $domain
	 * @return void
	 */
	public function __construct($key, $domain)
	{
		$this->key = $key;
		$this->setDomain($domain);
	}

	/**
	 * {@inheritdoc}
	 */
	public function isStarted()
	{
		return true;
	}

	/**
	 * {@inheritdoc}
	 */
	public function start()
	{
		return true;
	}

	/**
	 * {@inheritdoc}
	 */
	public function stop()
	{
		return true;
	}

	/**
	 * {@inheritdoc}
	 */
	public function send(Swift_Mime_Message $message, &$failedRecipients = null)
	{
		$client = $this->getHttpClient();

		$client->post($this->url, ['auth' => ['api', $this->key],
			'body' => [
				'to' => $this->getTo($message),
				'message' => new PostFile('message', (string) $message),
			],
		]);
	}

	/**
	 * {@inheritdoc}
	 */
	public function registerPlugin(Swift_Events_EventListener $plugin)
	{
		//
	}

	/**
	 * Get the "to" payload field for the API request.
	 *
	 * @param  \Swift_Mime_Message  $message
	 * @return array
	 */
	protected function getTo(Swift_Mime_Message $message)
	{
		$formatted = [];

		$contacts = array_merge(
			(array) $message->getTo(), (array) $message->getCc(), (array) $message->getBcc()
		);

		foreach ($contacts as $address => $display)
		{
			$formatted[] = $display ? $display." <$address>" : $address;
		}

		return implode(',', $formatted);
	}

	/**
	 * Get a new HTTP client instance.
	 *
	 * @return \GuzzleHttp\Client
	 */
	protected function getHttpClient()
	{
		return new Client;
	}

	/**
	 * Get the API key being used by the transport.
	 *
	 * @return string
	 */
	public function getKey()
	{
		return $this->key;
	}

	/**
	 * Set the API key being used by the transport.
	 *
	 * @param  string  $key
	 * @return void
	 */
	public function setKey($key)
	{
		return $this->key = $key;
	}

	/**
	 * Get the domain being used by the transport.
	 *
	 * @return string
	 */
	public function getDomain()
	{
		return $this->domain;
	}

	/**
	 * Set the domain being used by the transport.
	 *
	 * @param  string  $domain
	 * @return void
	 */
	public function setDomain($domain)
	{
		$this->url = 'https://api.mailgun.net/v2/'.$domain.'/messages.mime';

		return $this->domain = $domain;
	}

}