<?php



namespace WPMailSMTP\Providers\Mailgun;



use WPMailSMTP\Providers\MailerAbstract;

use WPMailSMTP\WP;



/**

 * Class Mailer.

 *

 * @since 1.0.0

 */

class Mailer extends MailerAbstract {



	/**

	 * Which response code from HTTP provider is considered to be successful?

	 *

	 * @since 1.0.0

	 *

	 * @var int

	 */

	protected $email_sent_code = 200;



	/**

	 * API endpoint used for sites from all regions.

	 *

	 * @since 1.4.0

	 *

	 * @var string

	 */

	const API_BASE_US = 'https://api.mailgun.net/v3/';



	/**

	 * API endpoint used for sites from EU region.

	 *

	 * @since 1.4.0

	 *

	 * @var string

	 */

	const API_BASE_EU = 'https://api.eu.mailgun.net/v3/';



	/**

	 * URL to make an API request to.

	 *

	 * @since 1.0.0

	 *

	 * @var string

	 */

	protected $url = '';



	/**

	 * @inheritdoc

	 */

	public function __construct( $phpmailer ) {



		// Default value should be defined before the parent class contructor fires.

		$this->url = self::API_BASE_US;



		// We want to prefill everything from \WPMailSMTP\MailCatcher class, which extends \PHPMailer.

		parent::__construct( $phpmailer );



		// We have a special API URL to query in case of EU region.

		if ( 'EU' === $this->options->get( $this->mailer, 'region' ) ) {

			$this->url = self::API_BASE_EU;

		}



		/*

		 * Append the url with a domain,

		 * to avoid passing the domain name as a query parameter with all requests.

		 */

		$this->url .= sanitize_text_field( $this->options->get( $this->mailer, 'domain' ) . '/messages' );



		$this->set_header( 'Authorization', 'Basic ' . base64_encode( 'api:' . $this->options->get( $this->mailer, 'api_key' ) ) );

	}



	/**

	 * @inheritdoc

	 */

	public function set_from( $email, $name = '' ) {



		if ( ! filter_var( $email, FILTER_VALIDATE_EMAIL ) ) {

			return;

		}



		if ( ! empty( $name ) ) {

			$this->set_body_param(

				array(

					'from' => $name . ' <' . $email . '>',

				)

			);

		} else {

			$this->set_body_param(

				array(

					'from' => $email,

				)

			);

		}

	}



	/**

	 * @inheritdoc

	 */

	public function set_recipients( $recipients ) {



		if ( empty( $recipients ) ) {

			return;

		}



		$default = array( 'to', 'cc', 'bcc' );



		foreach ( $recipients as $kind => $emails ) {

			if (

				! in_array( $kind, $default, true ) ||

				empty( $emails ) ||

				! is_array( $emails )

			) {

				continue;

			}



			$data = array();



			foreach ( $emails as $email ) {

				$addr = isset( $email[0] ) ? $email[0] : false;

				$name = isset( $email[1] ) ? $email[1] : false;



				if ( ! filter_var( $addr, FILTER_VALIDATE_EMAIL ) ) {

					continue;

				}



				if ( ! empty( $name ) ) {

					$data[] = $name . ' <' . $addr . '>';

				} else {

					$data[] = $addr;

				}

			}



			if ( ! empty( $data ) ) {

				$this->set_body_param(

					array(

						$kind => implode( ', ', $data ),

					)

				);

			}

		}

	}



	/**

	 * @inheritdoc

	 */

	public function set_content( $content ) {



		if ( is_array( $content ) ) {



			$default = array( 'text', 'html' );



			foreach ( $content as $type => $mail ) {

				if (

					! in_array( $type, $default, true ) ||

					empty( $mail )

				) {

					continue;

				}



				$this->set_body_param(

					array(

						$type => $mail,

					)

				);

			}

		} else {



			$type = 'html';



			if ( $this->phpmailer->ContentType === 'text/plain' ) {

				$type = 'text';

			}



			if ( ! empty( $content ) ) {

				$this->set_body_param(

					array(

						$type => $content,

					)

				);

			}

		}

	}



	/**

	 * Redefine the way custom headers are process for this mailer - they should be in body.

	 *

	 * @since 1.5.0

	 *

	 * @param array $headers

	 */

	public function set_headers( $headers ) {



		foreach ( $headers as $header ) {

			$name  = isset( $header[0] ) ? $header[0] : false;

			$value = isset( $header[1] ) ? $header[1] : false;



			$this->set_body_header( $name, $value );

		}



		// Add custom PHPMailer-specific header.

		$this->set_body_header( 'X-Mailer', 'WPMailSMTP/Mailer/' . $this->mailer . ' ' . WPMS_PLUGIN_VER );

	}



	/**

	 * This mailer supports email-related custom headers inside a body of the message with a special prefix "h:".

	 *

	 * @since 1.5.0

	 */

	public function set_body_header( $name, $value ) {



		$name = sanitize_text_field( $name );



		$this->set_body_param(

			array(

				'h:' . $name => WP::sanitize_value( $value ),

			)

		);

	}



	/**

	 * It's the last one, so we can modify the whole body.

	 *

	 * @since 1.0.0

	 *

	 * @param array $attachments

	 */

	public function set_attachments( $attachments ) {



		if ( empty( $attachments ) ) {

			return;

		}



		$payload = '';

		$data    = array();



		foreach ( $attachments as $attachment ) {

			$file = false;



			/*

			 * We are not using WP_Filesystem API as we can't reliably work with it.

			 * It is not always available, same as credentials for FTP.

			 */

			try {

				if ( is_file( $attachment[0] ) && is_readable( $attachment[0] ) ) {

					$file = file_get_contents( $attachment[0] );

				}

			}

			catch ( \Exception $e ) {

				$file = false;

			}



			if ( $file === false ) {

				continue;

			}



			$data[] = array(

				'content' => $file,

				'name'    => $attachment[2],

			);

		}



		if ( ! empty( $data ) ) {



			// First, generate a boundary for the multipart message.

			$boundary = base_convert( uniqid( 'boundary', true ), 10, 36 );



			// Iterate through pre-built params and build a payload.

			foreach ( $this->body as $key => $value ) {

				if ( is_array( $value ) ) {

					foreach ( $value as $child_key => $child_value ) {

						$payload .= '--' . $boundary;

						$payload .= "\r\n";

						$payload .= 'Content-Disposition: form-data; name="' . $key . "\"\r\n\r\n";

						$payload .= $child_value;

						$payload .= "\r\n";

					}

				} else {

					$payload .= '--' . $boundary;

					$payload .= "\r\n";

					$payload .= 'Content-Disposition: form-data; name="' . $key . '"' . "\r\n\r\n";

					$payload .= $value;

					$payload .= "\r\n";

				}

			}



			// Now iterate through our attachments, and add them too.

			foreach ( $data as $key => $attachment ) {

				$payload .= '--' . $boundary;

				$payload .= "\r\n";

				$payload .= 'Content-Disposition: form-data; name="attachment[' . $key . ']"; filename="' . $attachment['name'] . '"' . "\r\n\r\n";

				$payload .= $attachment['content'];

				$payload .= "\r\n";

			}



			$payload .= '--' . $boundary . '--';



			// Redefine the body the "dirty way".

			$this->body = $payload;



			$this->set_header( 'Content-Type', 'multipart/form-data; boundary=' . $boundary );

		}

	}



	/**

	 * @inheritdoc

	 */

	public function set_reply_to( $reply_to ) {



		if ( empty( $reply_to ) ) {

			return;

		}



		$data = array();



		foreach ( $reply_to as $key => $emails ) {

			if (

				empty( $emails ) ||

				! is_array( $emails )

			) {

				continue;

			}



			$addr = isset( $emails[0] ) ? $emails[0] : false;

			$name = isset( $emails[1] ) ? $emails[1] : false;



			if ( ! filter_var( $addr, FILTER_VALIDATE_EMAIL ) ) {

				continue;

			}



			if ( ! empty( $name ) ) {

				$data[] = $name . ' <' . $addr . '>';

			} else {

				$data[] = $addr;

			}

		}



		if ( ! empty( $data ) ) {

			$this->set_body_param(

				array(

					'h:Reply-To' => implode( ',', $data ),

				)

			);

		}

	}



	/**

	 * @inheritdoc

	 */

	public function set_return_path( $email ) {



		if (

			$this->options->get( 'mail', 'return_path' ) !== true ||

			! filter_var( $email, FILTER_VALIDATE_EMAIL )

		) {

			return;

		}



		$this->set_body_param(

			array(

				'sender' => $email,

			)

		);

	}



	/**

	 * Get a Mailgun-specific response with a helpful error.

	 *

	 * @since 1.2.0

	 *

	 * @return string

	 */

	protected function get_response_error() {



		$body = (array) wp_remote_retrieve_body( $this->response );



		$error_text = array();



		if ( ! empty( $body['message'] ) ) {

			if ( is_string( $body['message'] ) ) {

				$error_text[] = $body['message'];

			} else {

				$error_text[] = \json_encode( $body['message'] );

			}

		} elseif ( ! empty( $body[0] ) ) {

			if ( is_string( $body[0] ) ) {

				$error_text[] = $body[0];

			} else {

				$error_text[] = \json_encode( $body[0] );

			}

		}



		return implode( '<br>', array_map( 'esc_textarea', $error_text ) );

	}



	/**

	 * @inheritdoc

	 */

	public function get_debug_info() {



		$mg_text = array();



		$options = new \WPMailSMTP\Options();

		$mailgun = $options->get_group( 'mailgun' );



		$mg_text[] = '<strong>Api Key / Domain:</strong> ' . ( ! empty( $mailgun['api_key'] ) && ! empty( $mailgun['domain'] ) ? 'Yes' : 'No' );



		return implode( '<br>', $mg_text );

	}



	/**

	 * @inheritdoc

	 */

	public function is_mailer_complete() {



		$options = $this->options->get_group( $this->mailer );



		// API key is the only required option.

		if (

			! empty( $options['api_key'] ) &&

			! empty( $options['domain'] )

		) {

			return true;

		}



		return false;

	}

}

