<?php

/**

 * WP_Privacy_Policy_Content class.

 *

 * @package WordPress

 * @subpackage Administration

 * @since 4.9.6

 */

final class WP_Privacy_Policy_Content {

	private static $policy_content = array();

	/**

	 * Constructor

	 *

	 * @since 4.9.6

	 */

	private function __construct() {}

	/**

	 * Add content to the postbox shown when editing the privacy policy.

	 *

	 * Plugins and themes should suggest text for inclusion in the site's privacy policy.

	 * The suggested text should contain information about any functionality that affects user privacy,

	 * and will be shown in the Suggested Privacy Policy Content postbox.

	 *

	 * Intended for use from `wp_add_privacy_policy_content()`.

	 *

	 * @since 4.9.6

	 *

	 * @param string $plugin_name The name of the plugin or theme that is suggesting content for the site's privacy policy.

	 * @param string $policy_text The suggested content for inclusion in the policy.

	 */

	public static function add( $plugin_name, $policy_text ) {

		if ( empty( $plugin_name ) || empty( $policy_text ) ) {

			return;

		}

		$data = array(

			'plugin_name' => $plugin_name,

			'policy_text' => $policy_text,

		);

		if ( ! in_array( $data, self::$policy_content, true ) ) {

			self::$policy_content[] = $data;

		}

	}

	/**

	 * Quick check if any privacy info has changed.

	 *

	 * @since 4.9.6

	 */

	public static function text_change_check() {

		$policy_page_id = (int) get_option( 'wp_page_for_privacy_policy' );

		// The site doesn't have a privacy policy.

		if ( empty( $policy_page_id ) ) {

			return false;

		}

		if ( ! current_user_can( 'edit_post', $policy_page_id ) ) {

			return false;

		}

		$old = (array) get_post_meta( $policy_page_id, '_wp_suggested_privacy_policy_content' );

		// Updates are not relevant if the user has not reviewed any suggestions yet.

		if ( empty( $old ) ) {

			return false;

		}

		$cached = get_option( '_wp_suggested_policy_text_has_changed' );

		/*

		 * When this function is called before `admin_init`, `self::$policy_content`

		 * has not been populated yet, so use the cached result from the last

		 * execution instead.

		 */

		if ( ! did_action( 'admin_init' ) ) {

			return 'changed' === $cached;

		}

		$new = self::$policy_content;

		// Remove the extra values added to the meta.

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

				unset( $old[ $key ] );

				continue;

			}

			$old[ $key ] = array(

				'plugin_name' => $data['plugin_name'],

				'policy_text' => $data['policy_text'],

			);

		}

		// Normalize the order of texts, to facilitate comparison.

		sort( $old );

		sort( $new );

		// The == operator (equal, not identical) was used intentionally.

		// See http://php.net/manual/en/language.operators.array.php

		if ( $new != $old ) {

			// A plugin was activated or deactivated, or some policy text has changed.

			// Show a notice on the relevant screens to inform the admin.

			add_action( 'admin_notices', array( 'WP_Privacy_Policy_Content', 'policy_text_changed_notice' ) );

			$state = 'changed';

		} else {

			$state = 'not-changed';

		}

		// Cache the result for use before `admin_init` (see above).

		if ( $cached !== $state ) {

			update_option( '_wp_suggested_policy_text_has_changed', $state );

		}

		return 'changed' === $state;

	}

	/**

	 * Output a warning when some privacy info has changed.

	 *

	 * @since 4.9.6

	 */

	public static function policy_text_changed_notice() {

		global $post;

		$screen = get_current_screen()->id;

		if ( 'privacy' !== $screen ) {

			return;

		}

		?>

		<div class="policy-text-updated notice notice-warning is-dismissible">

			<p>

			<?php

				printf(

					/* translators: %s: Privacy Policy Guide URL. */

					__( 'The suggested privacy policy text has changed. Please <a href="%s">review the guide</a> and update your privacy policy.' ),

				);

			?>

			</p>

		</div>

		<?php

	}

	/**

	 * Update the cached policy info when the policy page is updated.

	 *

	 * @since 4.9.6

	 * @access private

	 *

	 * @param int $post_id The ID of the updated post.

	 */

	public static function _policy_page_updated( $post_id ) {

		$policy_page_id = (int) get_option( 'wp_page_for_privacy_policy' );

		if ( ! $policy_page_id || $policy_page_id !== (int) $post_id ) {

			return;

		}

		// Remove updated|removed status.

		$old          = (array) get_post_meta( $policy_page_id, '_wp_suggested_privacy_policy_content' );

		$done         = array();

		$update_cache = false;

		foreach ( $old as $old_key => $old_data ) {

			if ( ! empty( $old_data['removed'] ) ) {

				// Remove the old policy text.

				$update_cache = true;

				continue;

			}

			if ( ! empty( $old_data['updated'] ) ) {

				// 'updated' is now 'added'.

				$done[]       = array(

					'plugin_name' => $old_data['plugin_name'],

					'policy_text' => $old_data['policy_text'],

					'added'       => $old_data['updated'],

				);

				$update_cache = true;

			} else {

				$done[] = $old_data;

			}

		}

		if ( $update_cache ) {

			delete_post_meta( $policy_page_id, '_wp_suggested_privacy_policy_content' );

			// Update the cache.

			foreach ( $done as $data ) {

				add_post_meta( $policy_page_id, '_wp_suggested_privacy_policy_content', $data );

			}

		}

	}

	/**

	 * Check for updated, added or removed privacy policy information from plugins.

	 *

	 * Caches the current info in post_meta of the policy page.

	 *

	 * @since 4.9.6

	 *

	 * @return array The privacy policy text/information added by core and plugins.

	 */

	public static function get_suggested_policy_text() {

		$policy_page_id = (int) get_option( 'wp_page_for_privacy_policy' );

		$checked        = array();

		$time           = time();

		$update_cache   = false;

		$new            = self::$policy_content;

		$old            = array();

		if ( $policy_page_id ) {

			$old = (array) get_post_meta( $policy_page_id, '_wp_suggested_privacy_policy_content' );

		}

		// Check for no-changes and updates.

		foreach ( $new as $new_key => $new_data ) {

			foreach ( $old as $old_key => $old_data ) {

				$found = false;

				if ( $new_data['policy_text'] === $old_data['policy_text'] ) {

					// Use the new plugin name in case it was changed, translated, etc.

					if ( $old_data['plugin_name'] !== $new_data['plugin_name'] ) {

						$old_data['plugin_name'] = $new_data['plugin_name'];

						$update_cache            = true;

					}

					// A plugin was re-activated.

					if ( ! empty( $old_data['removed'] ) ) {

						unset( $old_data['removed'] );

						$old_data['added'] = $time;

						$update_cache      = true;

					}

					$checked[] = $old_data;

					$found     = true;

				} elseif ( $new_data['plugin_name'] === $old_data['plugin_name'] ) {

					// The info for the policy was updated.

					$checked[]    = array(

						'plugin_name' => $new_data['plugin_name'],

						'policy_text' => $new_data['policy_text'],

						'updated'     => $time,

					);

					$found        = true;

					$update_cache = true;

				}

				if ( $found ) {

					unset( $new[ $new_key ], $old[ $old_key ] );

					continue 2;

				}

			}

		}

		if ( ! empty( $new ) ) {

			// A plugin was activated.

			foreach ( $new as $new_data ) {

				if ( ! empty( $new_data['plugin_name'] ) && ! empty( $new_data['policy_text'] ) ) {

					$new_data['added'] = $time;

					$checked[]         = $new_data;

				}

			}

			$update_cache = true;

		}

		if ( ! empty( $old ) ) {

			// A plugin was deactivated.

			foreach ( $old as $old_data ) {

				if ( ! empty( $old_data['plugin_name'] ) && ! empty( $old_data['policy_text'] ) ) {

					$data = array(

						'plugin_name' => $old_data['plugin_name'],

						'policy_text' => $old_data['policy_text'],

						'removed'     => $time,

					);

					$checked[] = $data;

				}

			}

			$update_cache = true;

		}

		if ( $update_cache && $policy_page_id ) {

			delete_post_meta( $policy_page_id, '_wp_suggested_privacy_policy_content' );

			// Update the cache.

			foreach ( $checked as $data ) {

				add_post_meta( $policy_page_id, '_wp_suggested_privacy_policy_content', $data );

			}

		}

		return $checked;

	}

	/**

	 * Add a notice with a link to the guide when editing the privacy policy page.

	 *

	 * @since 4.9.6

	 * @since 5.0.0 The `$post` parameter was made optional.

	 *

	 * @param WP_Post|null $post The currently edited post. Default null.

	 */

	public static function notice( $post = null ) {

		if ( is_null( $post ) ) {

			global $post;

		} else {

			$post = get_post( $post );

		}

		if ( ! ( $post instanceof WP_Post ) ) {

			return;

		}

		if ( ! current_user_can( 'manage_privacy_options' ) ) {

			return;

		}

		$current_screen = get_current_screen();

		$policy_page_id = (int) get_option( 'wp_page_for_privacy_policy' );

		if ( 'post' !== $current_screen->base || $policy_page_id !== $post->ID ) {

			return;

		}

		$message = __( 'Need help putting together your new Privacy Policy page? Check out our guide for recommendations on what content to include, along with policies suggested by your plugins and theme.' );

		$label   = __( 'View Privacy Policy Guide.' );

		if ( get_current_screen()->is_block_editor() ) {

			wp_enqueue_script( 'wp-notices' );

			$action = array(

				'url'   => $url,

				'label' => $label,

			);

			wp_add_inline_script(

				'wp-notices',

				sprintf(

					'wp.data.dispatch( "core/notices" ).createWarningNotice( "%s", { actions: [ %s ], isDismissible: false } )',

					$message,

					wp_json_encode( $action )

				),

				'after'

			);

		} else {

			?>

			<div class="notice notice-warning inline wp-pp-notice">

				<p>

				<?php

				echo $message;

				printf(

					' <a href="%s" target="_blank">%s <span class="screen-reader-text">%s</span></a>',

					$url,

					$label,

					/* translators: Accessibility text. */

					__( '(opens in a new tab)' )

				);

				?>

				</p>

			</div>

			<?php

		}

	}

	/**

	 * Output the privacy policy guide together with content from the theme and plugins.

	 *

	 * @since 4.9.6

	 */

	public static function privacy_policy_guide() {

		$content_array = self::get_suggested_policy_text();

		$content       = '';

		$date_format   = __( 'F j, Y' );

		foreach ( $content_array as $section ) {

			$class   = '';

			$meta    = '';

			$removed = '';

			if ( ! empty( $section['removed'] ) ) {

				/* translators: %s: Date of plugin deactivation. */

				/* translators: %s: Date of plugin deactivation. */

				$removed = __( 'You deactivated this plugin on %s and may no longer need this policy.' );

				$removed = '<div class="notice notice-info inline"><p>' . sprintf( $removed, $date ) . '</p></div>';

			} elseif ( ! empty( $section['updated'] ) ) {

				/* translators: %s: Date of privacy policy text update. */

			}

			$plugin_name = esc_html( $section['plugin_name'] );

			?>