<?php
/**
 * Plugin Name: Renderbit FAQ Structured Data
 * Plugin URI:  https://github.com/renderbit-technologies/renderbit-faq-structured-data-wordpress-plugin
 * Description: Manage FAQ items as a custom post type and output FAQPage JSON-LD on the posts and pages they apply to.
 * Version:     4.0.1
 * Requires at least: 6.5
 * Requires PHP: 7.2
 * Author:      Renderbit Technologies
 * License:     GPLv2 or later
 * License URI: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * Text Domain: renderbit-faq-structured-data
 *
 * @package Renderbit_FAQ_Structured_Data
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

// phpcs:disable PSR1.Files.SideEffects

// Keep in sync with the Version header above; used to version the plugin's own assets.
define( 'RFSD_VERSION', '4.0.1' );
// Upper bound for the invalidation batch size setting.
define( 'RFSD_MAX_BATCH_SIZE', 5000 );
define( 'RFSD_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
define( 'RFSD_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
define( 'RFSD_OPTION_KEY', 'rfsd_settings' );
define( 'RFSD_DB_VERSION', '3' );
define( 'RFSD_DB_VERSION_OPTION', 'rfsd_db_version' );

// Data migration version: bump to run a one-time reindex and cache purge on existing sites.
define( 'RFSD_DATA_VERSION', '3' );
define( 'RFSD_DATA_VERSION_OPTION', 'rfsd_data_version' );
define( 'RFSD_DATA_MIGRATION_CURSOR_OPTION', 'rfsd_data_migration_cursor' );
// URL associations rewritten by data migration 3, shown on the FAQ list screen until dismissed.
define( 'RFSD_URL_MIGRATION_REPORT_OPTION', 'rfsd_url_migration_report' );

define( 'RFSD_POST_TYPE', 'rfsd_faq' );
// Set once a site's data from the earlier FAQ JSON-LD Manager plugin (faq-jsonld) has been imported.
define( 'RFSD_LEGACY_IMPORT_OPTION', 'rfsd_legacy_import' );

/**
 * Autoload includes
 */
require_once RFSD_PLUGIN_DIR . 'includes/settings.php';
require_once RFSD_PLUGIN_DIR . 'includes/coverage.php';
require_once RFSD_PLUGIN_DIR . 'includes/indexer.php';
require_once RFSD_PLUGIN_DIR . 'includes/queue.php';
require_once RFSD_PLUGIN_DIR . 'includes/admin.php';
require_once RFSD_PLUGIN_DIR . 'includes/frontend.php';
require_once RFSD_PLUGIN_DIR . 'includes/class-rfsd-cli.php';
require_once RFSD_PLUGIN_DIR . 'includes/health.php';

/**
 * Register CPT
 */
function rfsd_register_cpt_faq_item() {
	$labels = array(
		'name'          => __( 'FAQ Items', 'renderbit-faq-structured-data' ),
		'singular_name' => __( 'FAQ Item', 'renderbit-faq-structured-data' ),
		'add_new_item'  => __( 'Add FAQ Item', 'renderbit-faq-structured-data' ),
		'edit_item'     => __( 'Edit FAQ Item', 'renderbit-faq-structured-data' ),
		'new_item'      => __( 'New FAQ Item', 'renderbit-faq-structured-data' ),
		'view_item'     => __( 'View FAQ Item', 'renderbit-faq-structured-data' ),
		'search_items'  => __( 'Search FAQ Items', 'renderbit-faq-structured-data' ),
		'not_found'     => __( 'No FAQ items found', 'renderbit-faq-structured-data' ),
		'all_items'     => __( 'All FAQ Items', 'renderbit-faq-structured-data' ),
	);
	$args   = array(
		'labels'          => $labels,
		'public'          => false,
		'show_ui'         => true,
		'show_in_menu'    => true,
		'capability_type' => 'post',
		'hierarchical'    => false,
		'supports'        => array( 'title', 'editor' ),
		'menu_position'   => 25,
		'menu_icon'       => 'dashicons-editor-help',
		'has_archive'     => false,
	);
	register_post_type( RFSD_POST_TYPE, $args );
}
add_action( 'init', 'rfsd_register_cpt_faq_item' );

/**
 * Storage names of the earlier FAQ JSON-LD Manager plugin (slug faq-jsonld), which this plugin replaces.
 *
 * Only read by rfsd_import_legacy_data(); this plugin never registers or writes any of them.
 *
 * @return array
 */
function rfsd_legacy_storage_names() {
	global $wpdb;

	return array(
		'post_type'           => 'faq_item',
		// Legacy meta key => this plugin's meta key.
		'meta'                => array(
			'fqj_assoc_data_json' => 'rfsd_assoc_data_json',
			'fqj_assoc_type'      => 'rfsd_assoc_type',
		),
		// Legacy option => this plugin's option, copied when this plugin's option is absent.
		'options'             => array(
			'fqj_settings'             => RFSD_OPTION_KEY,
			'fqj_url_migration_report' => RFSD_URL_MIGRATION_REPORT_OPTION,
		),
		// Options only the old plugin writes; without one of them a faq_item post belongs to some other plugin.
		'evidence_options'    => array( 'fqj_db_version', 'fqj_settings' ),
		'data_version_option' => 'fqj_data_version',
		'mappings_table'      => $wpdb->prefix . 'fqj_mappings',
		'cron_hooks'          => array( 'fqj_process_invalidation_queue', 'fqj_data_migration' ),
	);
}

/**
 * Import the current site's FAQs from the earlier FAQ JSON-LD Manager plugin, once per site.
 *
 * Only sites the old plugin was set up on are touched, so another plugin's `faq_item` posts stay its own.
 *
 * FAQ posts and their association meta are moved, so the old plugin stops printing them (no duplicate
 * FAQPage output) and deleting it afterwards cannot remove them. Settings, the mapping rows and the data
 * version are copied, so data migration 3 still finds the old `post` rows on sites below data version 3.
 * Runs before the data migration is scheduled and before activation checks for FAQs.
 */
function rfsd_import_legacy_data() {
	global $wpdb;

	if ( get_option( RFSD_LEGACY_IMPORT_OPTION ) ) {
		return;
	}

	$legacy    = rfsd_legacy_storage_names();
	$installed = false;
	foreach ( $legacy['evidence_options'] as $name ) {
		$installed = $installed || false !== get_option( $name );
	}
	if ( ! $installed ) {
		update_option( RFSD_LEGACY_IMPORT_OPTION, '1' );
		return;
	}
	rfsd_maybe_upgrade_db();

	// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.SlowDBQuery.slow_db_query_meta_key
	$ids = array_map( 'intval', $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM {$wpdb->posts} WHERE post_type = %s", $legacy['post_type'] ) ) );
	if ( $ids ) {
		$wpdb->update( $wpdb->posts, array( 'post_type' => RFSD_POST_TYPE ), array( 'post_type' => $legacy['post_type'] ) );
	}
	foreach ( $legacy['meta'] as $old_key => $new_key ) {
		$ids = array_merge( $ids, array_map( 'intval', $wpdb->get_col( $wpdb->prepare( "SELECT post_id FROM {$wpdb->postmeta} WHERE meta_key = %s", $old_key ) ) ) );
		$wpdb->update( $wpdb->postmeta, array( 'meta_key' => $new_key ), array( 'meta_key' => $old_key ) );
	}

	$copied   = false;
	$suppress = $wpdb->suppress_errors( true );
	// Fails quietly when the old table does not exist.
	$has_old = false !== $wpdb->query( $wpdb->prepare( 'SELECT 1 FROM %i LIMIT 0', $legacy['mappings_table'] ) );
	$wpdb->suppress_errors( $suppress );
	if ( $has_old && ! (int) $wpdb->get_var( $wpdb->prepare( 'SELECT COUNT(*) FROM %i', rfsd_table_name() ) ) ) {
		$copied = 0 < (int) $wpdb->query(
			$wpdb->prepare(
				'INSERT INTO %i (faq_id, mapping_type, mapping_value) SELECT faq_id, mapping_type, mapping_value FROM %i ORDER BY id',
				rfsd_table_name(),
				$legacy['mappings_table']
			)
		);
	}
	// phpcs:enable

	foreach ( array_unique( $ids ) as $id ) {
		clean_post_cache( $id );
	}

	foreach ( $legacy['options'] as $old_name => $new_name ) {
		$value = get_option( $old_name );
		if ( false === $value || false !== get_option( $new_name ) ) {
			continue;
		}
		if ( RFSD_URL_MIGRATION_REPORT_OPTION === $new_name ) {
			rfsd_update_option_no_autoload( $new_name, $value );
		} else {
			update_option( $new_name, $value );
		}
	}
	// Without copied rows the index has to be rebuilt, which a missing data version triggers.
	$data_version = get_option( $legacy['data_version_option'] );
	if ( $copied && false !== $data_version && false === get_option( RFSD_DATA_VERSION_OPTION ) ) {
		update_option( RFSD_DATA_VERSION_OPTION, $data_version );
	}

	foreach ( $legacy['cron_hooks'] as $hook ) {
		wp_clear_scheduled_hook( $hook );
	}

	update_option( RFSD_LEGACY_IMPORT_OPTION, '1' );
}
add_action( 'plugins_loaded', 'rfsd_import_legacy_data', 5 );

/**
 * Run a callback for every site of the network, or once when the install is single-site.
 *
 * @param callable $callback Called with no arguments while the site is switched to.
 */
function rfsd_for_each_site( $callback ) {
	if ( ! is_multisite() ) {
		call_user_func( $callback );
		return;
	}

	$site_ids = get_sites(
		array(
			'fields' => 'ids',
			'number' => 0,
		)
	);
	foreach ( $site_ids as $site_id ) {
		switch_to_blog( $site_id );
		call_user_func( $callback );
		restore_current_blog();
	}
}

/**
 * Activate the plugin for the current site: create DB table, defaults, schedule cron.
 */
function rfsd_activate_site() {
	rfsd_import_legacy_data();

	// A site with no FAQs yet has nothing to migrate.
	if ( false === get_option( RFSD_DATA_VERSION_OPTION ) && ! rfsd_has_faq_items() ) {
		// Cached output can outlive deleted FAQs on a reactivated site.
		rfsd_purge_all_faq_transients();
		update_option( RFSD_DATA_VERSION_OPTION, RFSD_DATA_VERSION );
	}

	rfsd_create_table();
	// Reactivating after an upgrade skips the plugins_loaded upgrade path, so carry old data over here too.
	rfsd_migrate_legacy_queue();
	rfsd_unautoload_options();

	$defaults            = array(
		'cache_ttl'   => 12 * HOUR_IN_SECONDS,
		'batch_size'  => 500,
		'output_type' => 'faqpage',
	);
	$opts                = get_option( RFSD_OPTION_KEY, array() );
	$opts                = wp_parse_args( $opts, $defaults );
	$opts['output_type'] = rfsd_normalize_output_type( $opts['output_type'] );
	update_option( RFSD_OPTION_KEY, $opts );

	// schedule cron if not scheduled.
	if ( ! wp_next_scheduled( 'rfsd_process_invalidation_queue' ) ) {
		// Use a custom interval 'rfsd_five_minutes' registered in queue.php.
		wp_schedule_event( time() + 60, 'rfsd_five_minutes', 'rfsd_process_invalidation_queue' );
	}
}

/**
 * Activation. On network activation every existing site is set up.
 *
 * @param bool $network_wide Whether the plugin is being activated network-wide.
 */
function rfsd_activate( $network_wide = false ) {
	if ( $network_wide && is_multisite() ) {
		rfsd_for_each_site( 'rfsd_activate_site' );
		return;
	}

	rfsd_activate_site();
}
register_activation_hook( __FILE__, 'rfsd_activate' );

/**
 * Set up a site created while the plugin is network-active.
 *
 * @param WP_Site $new_site The new site.
 */
function rfsd_on_initialize_site( $new_site ) {
	if ( ! function_exists( 'is_plugin_active_for_network' ) ) {
		require_once ABSPATH . 'wp-admin/includes/plugin.php';
	}
	if ( ! is_plugin_active_for_network( plugin_basename( __FILE__ ) ) ) {
		return;
	}

	switch_to_blog( (int) $new_site->blog_id );
	rfsd_activate_site();
	restore_current_blog();
}
// Late priority so the new site's default options and tables exist first.
add_action( 'wp_initialize_site', 'rfsd_on_initialize_site', 900 );

/**
 * Clear the plugin's scheduled events for the current site.
 */
function rfsd_clear_scheduled_events() {
	wp_clear_scheduled_hook( 'rfsd_process_invalidation_queue' );
	wp_clear_scheduled_hook( 'rfsd_data_migration' );
}

/**
 * Deactivation: clear cron events (on every site for network deactivation).
 *
 * @param bool $network_wide Whether the plugin is being deactivated network-wide.
 */
function rfsd_deactivate( $network_wide = false ) {
	if ( $network_wide && is_multisite() ) {
		rfsd_for_each_site( 'rfsd_clear_scheduled_events' );
		return;
	}

	rfsd_clear_scheduled_events();
}
register_deactivation_hook( __FILE__, 'rfsd_deactivate' );