<?php
/**
 * WPSEO Premium plugin file.
 *
 * @package WPSEO\Premium\Classes
 */

/**
 * Class handling the redirect options.
 */
class WPSEO_Redirect_Option {

	/**
	 * The plain redirect option before 3.1.
	 */
	const OLD_OPTION_PLAIN = 'wpseo-premium-redirects';

	/**
	 * The regex redirect option before 3.1.
	 */
	const OLD_OPTION_REGEX = 'wpseo-premium-redirects-regex';

	/**
	 * The option which contains the redirects base.
	 *
	 * @since 3.1
	 */
	const OPTION = 'wpseo-premium-redirects-base';

	/**
	 * The option which contains the  plain redirects.
	 *
	 * @since 3.1
	 */
	const OPTION_PLAIN = 'wpseo-premium-redirects-export-plain';

	/**
	 * The option which contains the regex redirects.
	 *
	 * @since 3.1
	 */
	const OPTION_REGEX = 'wpseo-premium-redirects-export-regex';

	/**
	 * List of redirects.
	 *
	 * @var WPSEO_Redirect[]
	 */
	private $redirects = array();

	/**
	 * Constructor.
	 *
	 * @param boolean $retrieve_redirects Whether to retrieve the redirects on construction.
	 */
	public function __construct( $retrieve_redirects = true ) {
		if ( $retrieve_redirects ) {
			$this->redirects = $this->get_all();
		}
	}

	/**
	 * Getting the array with all the redirects.
	 *
	 * @return WPSEO_Redirect[]
	 */
	public function get_all() {
		$redirects = $this->get_from_option();

		array_walk( $redirects, array( $this, 'map_option_to_object' ) );

		return $redirects;
	}

	/**
	 * Check if the old redirect doesn't exist already, if not it will be added.
	 *
	 * @param WPSEO_Redirect $redirect The redirect object to save.
	 *
	 * @return bool
	 */
	public function add( WPSEO_Redirect $redirect ) {
		if ( $this->search( $redirect->get_origin() ) === false ) {
			$this->run_redirects_modified_action( $redirect );

			$this->redirects[] = $redirect;

			return true;
		}

		return false;
	}

	/**
	 * Check if the $current_redirect exists and remove it if so.
	 *
	 * @param WPSEO_Redirect $current_redirect The current redirect value.
	 * @param WPSEO_Redirect $redirect         The redirect object to save.
	 *
	 * @return bool
	 */
	public function update( WPSEO_Redirect $current_redirect, WPSEO_Redirect $redirect ) {
		$found = $this->search( $current_redirect->get_origin() );
		if ( $found !== false ) {
			$this->run_redirects_modified_action( $redirect );

			$this->redirects[ $found ] = $redirect;

			return true;
		}

		return false;
	}

	/**
	 * Deletes the given redirect from the array.
	 *
	 * @param WPSEO_Redirect $current_redirect The redirect that will be removed.
	 *
	 * @return bool
	 */
	public function delete( WPSEO_Redirect $current_redirect ) {
		$found = $this->search( $current_redirect->get_origin() );
		if ( $found !== false ) {
			$this->run_redirects_modified_action( $current_redirect );

			unset( $this->redirects[ $found ] );

			return true;
		}

		return false;
	}

	/**
	 * Get a redirect from the array.
	 *
	 * @param string $origin The redirects origin to search for.
	 *
	 * @return WPSEO_Redirect|bool
	 */
	public function get( $origin ) {
		$found = $this->search( $origin );
		if ( $found !== false ) {
			return $this->redirects[ $found ];
		}

		return false;
	}

	/**
	 * Check if the $origin already exists as a key in the array.
	 *
	 * @param string $origin The redirect to search for.
	 *
	 * @return int|bool
	 */
	public function search( $origin ) {
		foreach ( $this->redirects as $redirect_key => $redirect ) {
			if ( $redirect->origin_is( $origin ) ) {
				return $redirect_key;
			}
		}

		return false;
	}

	/**
	 * Saving the redirects.
	 *
	 * @param bool $retry_upgrade Whether or not to retry the 3.1 upgrade. Used to prevent infinite recursion.
	 */
	public function save( $retry_upgrade = true ) {
		$redirects = $this->redirects;

		// Retry the 3.1 upgrade routine to make sure we're always dealing with valid redirects.
		$upgrade_manager = new WPSEO_Upgrade_Manager();
		if ( $retry_upgrade && $upgrade_manager->should_retry_upgrade_31() ) {
			$upgrade_manager->retry_upgrade_31( true );
			$redirects = array_merge( $redirects, $this->get_all() );
		}

		array_walk( $redirects, array( $this, 'map_object_to_option' ) );

		// Update the database option.
		update_option( self::OPTION, apply_filters( 'wpseo_premium_save_redirects', $redirects ), false );
	}

	/**
	 * Setting the redirects property.
	 *
	 * @param string $option_name The target option name.
	 *
	 * @return array
	 */
	public function get_from_option( $option_name = self::OPTION ) {
		$redirects = apply_filters( 'wpseo_premium_get_redirects', get_option( $option_name ) );
		if ( ! is_array( $redirects ) ) {
			$redirects = array();
		}

		return $redirects;
	}

	/**
	 * Runs the redirects modified hook with the altered redirect as input.
	 *
	 * @param WPSEO_Redirect $redirect The redirect that has been altered.
	 *
	 * @return void
	 */
	protected function run_redirects_modified_action( WPSEO_Redirect $redirect ) {
		/**
		 * Filter: wpseo_premium_redirects_modified - Allow developers run actions when the redirects are modified.
		 *
		 * @api   string $origin The redirect origin.
		 * @param string $target The redirect target.
		 * @param int    $type   The redirect type (301, 404, 410, etc).
		 */
		do_action( 'wpseo_premium_redirects_modified', $redirect->get_origin(), $redirect->get_target(), $redirect->get_type() );
	}

	/**
	 * Maps the array values to a redirect object.
	 *
	 * @param array $redirect_values The data for the redirect option.
	 */
	private function map_option_to_object( array &$redirect_values ) {
		$redirect_values = new WPSEO_Redirect( $redirect_values['origin'], $redirect_values['url'], $redirect_values['type'], $redirect_values['format'] );
	}

	/**
	 * Maps a redirect object to an array option.
	 *
	 * @param WPSEO_Redirect $redirect The redirect to map.
	 */
	private function map_object_to_option( WPSEO_Redirect &$redirect ) {
		$redirect = array(
			'origin' => $redirect->get_origin(),
			'url'    => $redirect->get_target(),
			'type'   => $redirect->get_type(),
			'format' => $redirect->get_format(),
		);
	}
}
