<?php
/**
 * @package WPSEO\Internals\Options
 */

/**
 * Site option for Multisite installs only
 *
 * Overloads a number of methods of the abstract class to ensure the use of the correct site_option
 * WP functions.
 */
class WPSEO_Option_MS extends WPSEO_Option {

	/**
	 * @var  string  option name
	 */
	public $option_name = 'wpseo_ms';

	/**
	 * @var  string  option group name for use in settings forms
	 */
	public $group_name = 'yoast_wpseo_multisite_options';

	/**
	 * @var  bool  whether to include the option in the return for WPSEO_Options::get_all()
	 */
	public $include_in_all = false;

	/**
	 * @var  bool  whether this option is only for when the install is multisite
	 */
	public $multisite_only = true;

	/**
	 * @var  array  Array of defaults for the option
	 *        Shouldn't be requested directly, use $this->get_defaults();
	 */
	protected $defaults = array(
		'access'      => 'admin',
		'defaultblog' => '', // Numeric blog ID or empty.
	);

	/**
	 * @var  array $allowed_access_options Available options for the 'access' setting
	 *                    Used for input validation
	 *
	 * @static
	 *
	 * {@internal Important: Make sure the options added to the array here are in line
	 *            with the keys for the options set for the select box in the
	 *            admin/pages/network.php file.}}
	 */
	public static $allowed_access_options = array(
		'admin',
		'superadmin',
	);


	/**
	 * Get the singleton instance of this class
	 *
	 * @return object
	 */
	public static function get_instance() {
		if ( ! ( self::$instance instanceof self ) ) {
			self::$instance = new self();
		}

		return self::$instance;
	}

	/**
	 * Only run parent constructor in multisite context.
	 */
	public function __construct() {
		if ( is_multisite() ) {
			parent::__construct();
		}
	}

	/**
	 * Add filters to make sure that the option default is returned if the option is not set
	 *
	 * @return  void
	 */
	public function add_default_filters() {
		// Don't change, needs to check for false as could return prio 0 which would evaluate to false.
		if ( has_filter( 'default_site_option_' . $this->option_name, array( $this, 'get_defaults' ) ) === false ) {
			add_filter( 'default_site_option_' . $this->option_name, array( $this, 'get_defaults' ) );
		}
	}


	/**
	 * Remove the default filters.
	 * Called from the validate() method to prevent failure to add new options
	 *
	 * @return  void
	 */
	public function remove_default_filters() {
		remove_filter( 'default_site_option_' . $this->option_name, array( $this, 'get_defaults' ) );
	}


	/**
	 * Add filters to make sure that the option is merged with its defaults before being returned
	 *
	 * @return  void
	 */
	public function add_option_filters() {
		// Don't change, needs to check for false as could return prio 0 which would evaluate to false.
		if ( has_filter( 'site_option_' . $this->option_name, array( $this, 'get_option' ) ) === false ) {
			add_filter( 'site_option_' . $this->option_name, array( $this, 'get_option' ) );
		}
	}


	/**
	 * Remove the option filters.
	 * Called from the clean_up methods to make sure we retrieve the original old option
	 *
	 * @return  void
	 */
	public function remove_option_filters() {
		remove_filter( 'site_option_' . $this->option_name, array( $this, 'get_option' ) );
	}


	/* *********** METHODS influencing add_uption(), update_option() and saving from admin pages *********** */


	/**
	 * Validate the option
	 *
	 * @param  array $dirty New value for the option.
	 * @param  array $clean Clean value for the option, normally the defaults.
	 * @param  array $old   Old value of the option.
	 *
	 * @return  array      Validated clean value for the option to be saved to the database
	 */
	protected function validate_option( $dirty, $clean, $old ) {

		foreach ( $clean as $key => $value ) {
			switch ( $key ) {
				case 'access':
					if ( isset( $dirty[ $key ] ) && in_array( $dirty[ $key ], self::$allowed_access_options, true ) ) {
						$clean[ $key ] = $dirty[ $key ];
					}
					elseif ( function_exists( 'add_settings_error' ) ) {
						add_settings_error(
							$this->group_name, // Slug title of the setting.
							'_' . $key, // Suffix-id for the error message box.
							/* translators: %1$s expands to the option name and %2$sexpands to Yoast SEO */
							sprintf( __( '%1$s is not a valid choice for who should be allowed access to the %2$s settings. Value reset to the default.', 'wordpress-seo' ), esc_html( sanitize_text_field( $dirty[ $key ] ) ), 'Yoast SEO' ), // The error message.
							'error' // Error type, either 'error' or 'updated'.
						);
					}
					break;


				case 'defaultblog':
					if ( isset( $dirty[ $key ] ) && ( $dirty[ $key ] !== '' && $dirty[ $key ] !== '-' ) ) {
						$int = WPSEO_Utils::validate_int( $dirty[ $key ] );
						if ( $int !== false && $int > 0 ) {
							// Check if a valid blog number has been received.
							$exists = get_blog_details( $int, false );
							if ( $exists && $exists->deleted === '0' ) {
								$clean[ $key ] = $int;
							}
							elseif ( function_exists( 'add_settings_error' ) ) {
								add_settings_error(
									$this->group_name, // Slug title of the setting.
									'_' . $key, // Suffix-id for the error message box.
									esc_html__( 'The default blog setting must be the numeric blog id of the blog you want to use as default.', 'wordpress-seo' )
										. '<br>'
										. sprintf(
											/* translators: %s is the ID number of a blog. */
											esc_html__( 'This must be an existing blog. Blog %s does not exist or has been marked as deleted.', 'wordpress-seo' ),
											'<strong>' . esc_html( sanitize_text_field( $dirty[ $key ] ) ) . '</strong>'
										), // The error message.
									'error' // Error type, either 'error' or 'updated'.
								);
							}
							unset( $exists );
						}
						elseif ( function_exists( 'add_settings_error' ) ) {
							add_settings_error(
								$this->group_name, // Slug title of the setting.
								'_' . $key, // Suffix-id for the error message box.
								esc_html__( 'The default blog setting must be the numeric blog id of the blog you want to use as default.', 'wordpress-seo' ) . '<br>' . esc_html__( 'No numeric value was received.', 'wordpress-seo' ), // The error message.
								'error' // Error type, either 'error' or 'updated'.
							);
						}
						unset( $int );
					}
					break;

				default:
					$clean[ $key ] = ( isset( $dirty[ $key ] ) ? WPSEO_Utils::validate_bool( $dirty[ $key ] ) : false );
					break;
			}
		}

		return $clean;
	}


	/**
	 * Clean a given option value
	 *
	 * @param  array  $option_value          Old (not merged with defaults or filtered) option value to
	 *                                       clean according to the rules for this option.
	 * @param  string $current_version       (optional) Version from which to upgrade, if not set,
	 *                                       version specific upgrades will be disregarded.
	 * @param  array  $all_old_option_values (optional) Only used when importing old options to have
	 *                                       access to the real old values, in contrast to the saved ones.
	 *
	 * @return  array            Cleaned option
	 */

	/*
	Protected function clean_option( $option_value, $current_version = null, $all_old_option_values = null ) {

		return $option_value;
	}
	*/
}