<?php
/**
 * Helper class providing various static utility functions for use in Search.
 *
 * @package    automattic/jetpack-search
 */

namespace Automattic\Jetpack\Search;

use Automattic\Jetpack\Status;
use GP_Locales;
use Jetpack; // TODO: Remove this once migrated.

if ( ! defined( 'ABSPATH' ) ) {
	exit( 0 );
}

/**
 * Various helper functions for reuse throughout the Jetpack Search code.
 */
class Helper {

	/**
	 * The search widget's base ID.
	 *
	 * @since 5.8.0
	 * @var string
	 */
	const FILTER_WIDGET_BASE = 'jetpack-search-filters';

	/**
	 * Create a URL for the current search that doesn't include the "paged" parameter.
	 *
	 * @since 5.8.0
	 *
	 * @return string The search URL.
	 */
	public static function get_search_url() {
		// WordPress search doesn't use nonces.
		$query_args = stripslashes_deep( $_GET ); //phpcs:ignore WordPress.Security.NonceVerification.Recommended

		// Handle the case where a permastruct is being used, such as /search/{$query}.
		if ( ! isset( $query_args['s'] ) ) {
			$query_args['s'] = get_search_query();
		}

		if ( isset( $query_args['paged'] ) ) {
			unset( $query_args['paged'] );
		}

		$query = http_build_query( $query_args );

		return home_url( "?{$query}" );
	}

	/**
	 * Wraps add_query_arg() with the URL defaulting to the current search URL.
	 *
	 * @see   add_query_arg()
	 *
	 * @since 5.8.0
	 *
	 * @param string|array $key   Either a query variable key, or an associative array of query variables.
	 * @param string       $value Optional. A query variable value.
	 * @param bool|string  $url   Optional. A URL to act upon. Defaults to the current search URL.
	 *
	 * @return string New URL query string (unescaped).
	 */
	public static function add_query_arg( $key, $value = false, $url = false ) {
		$url = empty( $url ) ? self::get_search_url() : $url;
		if ( is_array( $key ) ) {
			return add_query_arg( $key, $url );
		}

		return add_query_arg( $key, $value, $url );
	}

	/**
	 * Wraps remove_query_arg() with the URL defaulting to the current search URL.
	 *
	 * @see   remove_query_arg()
	 *
	 * @since 5.8.0
	 *
	 * @param string|array $key   Query key or keys to remove.
	 * @param bool|string  $url Optional. A URL to act upon.  Defaults to the current search URL.
	 *
	 * @return string New URL query string (unescaped).
	 */
	public static function remove_query_arg( $key, $url = false ) {
		$url = empty( $url ) ? self::get_search_url() : $url;

		return remove_query_arg( $key, $url );
	}

	/**
	 * Returns the name of the search widget's option.
	 *
	 * @since 5.8.0
	 *
	 * @return string The search widget option name.
	 */
	public static function get_widget_option_name() {
		return sprintf( 'widget_%s', self::FILTER_WIDGET_BASE );
	}

	/**
	 * Returns the search widget instances from the widget's option.
	 *
	 * @since 5.8.0
	 *
	 * @return array The widget options.
	 */
	public static function get_widgets_from_option() {
		$widget_options = get_option( self::get_widget_option_name(), array() );

		// We don't need this.
		if ( ! empty( $widget_options ) && isset( $widget_options['_multiwidget'] ) ) {
			unset( $widget_options['_multiwidget'] );
		}

		return $widget_options;
	}

	/**
	 * Returns the widget ID (widget base plus the numeric ID).
	 *
	 * @param int $number The widget's numeric ID.
	 *
	 * @return string The widget's numeric ID prefixed with the search widget base.
	 */
	public static function build_widget_id( $number ) {
		return sprintf( '%s-%d', self::FILTER_WIDGET_BASE, $number );
	}

	/**
	 * Wrapper for is_active_widget() with the other parameters automatically supplied.
	 *
	 * @see   is_active_widget()
	 *
	 * @since 5.8.0
	 *
	 * @param int $widget_id Widget ID.
	 *
	 * @return bool Whether the widget is active or not.
	 */
	public static function is_active_widget( $widget_id ) {
		return (bool) is_active_widget( false, $widget_id, self::FILTER_WIDGET_BASE, true );
	}

	/**
	 * Returns an array of the filters from all active search widgets.
	 *
	 * @since 5.8.0
	 *
	 * @param array|null $allowed_widget_ids array of allowed widget IDs.
	 *
	 * @return array Active filters.
	 */
	public static function get_filters_from_widgets( $allowed_widget_ids = null ) {
		$filters = array();

		$widget_options = self::get_widgets_from_option();
		if ( empty( $widget_options ) ) {
			return $filters;
		}

		foreach ( (array) $widget_options as $number => $settings ) {
			$widget_id = self::build_widget_id( $number );
			if ( ! self::is_active_widget( $widget_id ) || empty( $settings['filters'] ) ) {
				continue;
			}
			if ( isset( $allowed_widget_ids ) && ! in_array( $widget_id, $allowed_widget_ids, true ) ) {
				continue;
			}

			foreach ( (array) $settings['filters'] as $widget_filter ) {
				$widget_filter['widget_id'] = $widget_id;

				if ( empty( $widget_filter['name'] ) ) {
					$widget_filter['name'] = self::generate_widget_filter_name( $widget_filter );
				}

				$type = $widget_filter['type'] ?? '';

				// If this is a product_attribute filter with no specific attribute, expand it to all global attributes.
				if ( 'product_attribute' === $type && empty( $widget_filter['attribute'] ) ) {
					$filters = self::expand_product_attribute_filters( $widget_filter, $filters );
				} else {
					$key             = sprintf( '%s_%d', $type, count( $filters ) );
					$filters[ $key ] = $widget_filter;
				}
			}
		}

		return $filters;
	}

	/**
	 * Expands a product_attribute filter into individual filters for each attribute.
	 *
	 * @since 5.8.0
	 *
	 * @param array $widget_filter The filter configuration.
	 * @param array $filters The existing filters array.
	 * @return array The filters array with expanded product attribute filters.
	 */
	private static function expand_product_attribute_filters( $widget_filter, $filters ) {
		if ( ! function_exists( 'wc_get_attribute_taxonomies' ) || ! function_exists( 'wc_attribute_taxonomy_name' ) ) {
			return $filters;
		}

		$product_attributes  = wc_get_attribute_taxonomies();
		$included_attributes = isset( $widget_filter['included_attributes'] ) ? (array) $widget_filter['included_attributes'] : array();

		// If no attributes are explicitly included, show all attributes (backward compatibility).
		// Also optimize by treating "all selected" the same as "none selected" to avoid O(n²) in_array() checks.
		$show_all = empty( $included_attributes ) || count( $included_attributes ) === count( $product_attributes );

		foreach ( $product_attributes as $attribute ) {
			$attribute_name = wc_attribute_taxonomy_name( $attribute->attribute_name );

			if ( ! $show_all && ! in_array( $attribute_name, $included_attributes, true ) ) {
				continue;
			}

			$key                          = sprintf( 'product_attribute_%d', count( $filters ) );
			$expanded_filter              = $widget_filter;
			$expanded_filter['attribute'] = $attribute_name;
			$expanded_filter['name']      = $attribute->attribute_label;
			unset( $expanded_filter['included_attributes'] );
			$filters[ $key ] = $expanded_filter;
		}

		return $filters;
	}

	/**
	 * Get the localized default label for a date filter.
	 *
	 * @since 5.8.0
	 *
	 * @param string $type       Date type, either year or month.
	 * @param bool   $is_updated Whether the filter was updated or not (adds "Updated" to the end).
	 *
	 * @return string The filter label.
	 */
	public static function get_date_filter_type_name( $type, $is_updated = false ) {
		switch ( $type ) {
			case 'year':
				$string = ( $is_updated )
					? esc_html_x( 'Year Updated', 'label for filtering posts', 'jetpack-search-pkg' )
					: esc_html_x( 'Year', 'label for filtering posts', 'jetpack-search-pkg' );
				break;
			case 'month':
			default:
				$string = ( $is_updated )
					? esc_html_x( 'Month Updated', 'label for filtering posts', 'jetpack-search-pkg' )
					: esc_html_x( 'Month', 'label for filtering posts', 'jetpack-search-pkg' );
				break;
		}

		return $string;
	}

	/**
	 * Creates a default name for a filter. Used when the filter label is blank.
	 *
	 * @since 5.8.0
	 *
	 * @param array $widget_filter The filter to generate the title for.
	 *
	 * @return string The suggested filter name.
	 */
	public static function generate_widget_filter_name( $widget_filter ) {
		$name = '';

		if ( ! isset( $widget_filter['type'] ) ) {
			return $name;
		}

		switch ( $widget_filter['type'] ) {
			case 'post_type':
				$name = _x( 'Post Types', 'label for filtering posts', 'jetpack-search-pkg' );
				break;

			case 'author':
				$name = _x( 'Authors', 'label for filtering posts', 'jetpack-search-pkg' );
				break;

			case 'blog_id':
				$name = _x( 'Blogs', 'label for filtering posts', 'jetpack-search-pkg' );
				break;

			case 'date_histogram':
				$modified_fields = array(
					'post_modified',
					'post_modified_gmt',
				);
				switch ( $widget_filter['interval'] ) {
					case 'year':
						$name = self::get_date_filter_type_name(
							'year',
							in_array( $widget_filter['field'], $modified_fields, true )
						);
						break;
					case 'month':
					default:
						$name = self::get_date_filter_type_name(
							'month',
							in_array( $widget_filter['field'], $modified_fields, true )
						);
						break;
				}
				break;

			case 'taxonomy':
				$tax = get_taxonomy( $widget_filter['taxonomy'] );
				if ( ! $tax ) {
					break;
				}

				if ( isset( $tax->label ) ) {
					$name = $tax->label;
				} elseif ( isset( $tax->labels ) && isset( $tax->labels->name ) ) {
					$name = $tax->labels->name;
				}
				break;

			case 'product_attribute':
				$name = _x( 'Product Attributes', 'label for filtering posts', 'jetpack-search-pkg' );
				break;

		}

		return $name;
	}

	/**
	 * Whether we should rerun a search in the customizer preview or not.
	 *
	 * @since 5.8.0
	 *
	 * @return bool
	 */
	public static function should_rerun_search_in_customizer_preview() {
		// Only update when in a customizer preview and data is being posted.
		// Check for $_POST removes an extra update when the customizer loads.
		//
		// Note: We use $GLOBALS['wp_customize'] here instead of is_customize_preview() to support unit tests.
		return isset( $GLOBALS['wp_customize'] ) && $GLOBALS['wp_customize']->is_preview() && ! empty( $_POST ); // phpcs:ignore
	}

	/**
	 * Since PHP's built-in array_diff() works by comparing the values that are in array 1 to the other arrays,
	 * if there are less values in array 1, it's possible to get an empty diff where one might be expected.
	 *
	 * @since 5.8.0
	 *
	 * @param array $array_1 The first array.
	 * @param array $array_2 The second array.
	 *
	 * @return array
	 */
	public static function array_diff( $array_1, $array_2 ) {
		// If the array counts are the same, then the order doesn't matter. If the count of
		// $array_1 is higher than $array_2, that's also fine. If the count of $array_2 is higher,
		// we need to swap the array order though.
		if ( count( $array_1 ) !== count( $array_2 ) && count( $array_2 ) > count( $array_1 ) ) {
			$temp    = $array_1;
			$array_1 = $array_2;
			$array_2 = $temp;
		}

		// Disregard keys.
		return array_values( array_diff( $array_1, $array_2 ) );
	}

	/**
	 * Given the widget instance, will return true when selected post types differ from searchable post types.
	 *
	 * @since 5.8.0
	 *
	 * @param array $post_types An array of post types.
	 *
	 * @return bool
	 */
	public static function post_types_differ_searchable( $post_types ) {
		if ( empty( $post_types ) ) {
			return false;
		}

		$searchable_post_types = get_post_types( array( 'exclude_from_search' => false ) );
		$diff_of_searchable    = self::array_diff( $searchable_post_types, (array) $post_types );

		return ! empty( $diff_of_searchable );
	}

	/**
	 * Given the array of post types, will return true when these differ from the current search query.
	 *
	 * @since 5.8.0
	 *
	 * @param array $post_types An array of post types.
	 *
	 * @return bool
	 */
	public static function post_types_differ_query( $post_types ) {
		if ( empty( $post_types ) ) {
			return false;
		}

		// phpcs:disable WordPress.Security.NonceVerification.Recommended -- WordPress search doesn't use nonces.
		// phpcs:disable WordPress.Security.ValidatedSanitizedInput -- Sanitization happens at the end.
		if ( empty( $_GET['post_type'] ) ) {
			$post_types_from_query = array();
		} elseif ( is_array( $_GET['post_type'] ) ) {
			$post_types_from_query = $_GET['post_type'];
		} else {
			$post_types_from_query = explode( ',', $_GET['post_type'] );
		}
		// phpcs:enable WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput

		$post_types_from_query = array_map( 'sanitize_key', $post_types_from_query );

		$diff_query = self::array_diff( (array) $post_types, $post_types_from_query );

		return ! empty( $diff_query );
	}

	/**
	 * Determine what Tracks value should be used when updating a widget.
	 *
	 * @since 5.8.0
	 *
	 * @param mixed $old_value The old option value.
	 * @param mixed $new_value The new option value.
	 *
	 * @return array|false False if the widget wasn't updated, otherwise an array of the Tracks action and widget properties.
	 */
	public static function get_widget_tracks_value( $old_value, $new_value ) {
		$old_value = (array) $old_value;
		if ( isset( $old_value['_multiwidget'] ) ) {
			unset( $old_value['_multiwidget'] );
		}

		$new_value = (array) $new_value;
		if ( isset( $new_value['_multiwidget'] ) ) {
			unset( $new_value['_multiwidget'] );
		}

		$old_keys = array_keys( $old_value );
		$new_keys = array_keys( $new_value );

		if ( count( $new_keys ) > count( $old_keys ) ) { // This is the case for a widget being added.
			$diff   = self::array_diff( $new_keys, $old_keys );
			$action = 'widget_added';
			$widget = empty( $diff ) || ! isset( $new_value[ $diff[0] ] )
				? false
				: $new_value[ $diff[0] ];
		} elseif ( count( $old_keys ) > count( $new_keys ) ) { // This is the case for a widget being deleted.
			$diff   = self::array_diff( $old_keys, $new_keys );
			$action = 'widget_deleted';
			$widget = empty( $diff ) || ! isset( $old_value[ $diff[0] ] )
				? false
				: $old_value[ $diff[0] ];
		} else {
			$action = 'widget_updated';
			$widget = false;

			// This is a bit crazy. Since there can be multiple widgets stored in a single option,
			// we need to diff the old and new values to figure out which widget was updated.
			foreach ( $new_value as $key => $new_instance ) {
				if ( ! isset( $old_value[ $key ] ) ) {
					continue;
				}
				$old_instance = $old_value[ $key ];

				// First, let's test the keys of each instance.
				$diff = self::array_diff( array_keys( $new_instance ), array_keys( $old_instance ) );
				if ( ! empty( $diff ) ) {
					$widget = $new_instance;
					break;
				}

				// Next, lets's loop over each value and compare it.
				foreach ( $new_instance as $k => $v ) {
					if ( is_scalar( $v ) && (string) $v !== (string) $old_instance[ $k ] ) {
						$widget = $new_instance;
						break;
					}

					if ( 'filters' === $k ) {
						if ( ! is_countable( $new_instance['filters'] ) || ! is_countable( $old_instance['filters'] ) ) {
							continue;
						}

						if ( count( $new_instance['filters'] ) !== count( $old_instance['filters'] ) ) {
							$widget = $new_instance;
							break;
						}

						foreach ( $v as $filter_key => $new_filter_value ) {
							$diff = self::array_diff( $new_filter_value, $old_instance['filters'][ $filter_key ] );
							if ( ! empty( $diff ) ) {
								$widget = $new_instance;
								break;
							}
						}
					}
				}
			}
		}

		if ( empty( $widget ) ) {
			return false;
		}

		return array(
			'action' => $action,
			'widget' => self::get_widget_properties_for_tracks( $widget ),
		);
	}

	/**
	 * Creates the widget properties for sending to Tracks.
	 *
	 * @since 5.8.0
	 *
	 * @param array $widget The widget instance.
	 *
	 * @return array The widget properties.
	 */
	public static function get_widget_properties_for_tracks( $widget ) {
		$sanitized = array();

		foreach ( (array) $widget as $key => $value ) {
			if ( '_multiwidget' === $key ) {
				continue;
			}

			if ( is_scalar( $value ) ) {
				$key               = str_replace( '-', '_', sanitize_key( $key ) );
				$key               = "widget_{$key}";
				$sanitized[ $key ] = $value;
			}
		}

		$filters_properties = ! empty( $widget['filters'] )
			? self::get_filter_properties_for_tracks( $widget['filters'] )
			: array();

		return array_merge( $sanitized, $filters_properties );
	}

	/**
	 * Creates the filter properties for sending to Tracks.
	 *
	 * @since 5.8.0
	 *
	 * @param array $filters An array of filters.
	 *
	 * @return array The filter properties.
	 */
	public static function get_filter_properties_for_tracks( $filters ) {
		if ( empty( $filters ) ) {
			return $filters;
		}

		$filters_properties = array(
			'widget_filter_count' => count( $filters ),
		);

		foreach ( $filters as $filter ) {
			if ( empty( $filter['type'] ) ) {
				continue;
			}

			$key = sprintf( 'widget_filter_type_%s', $filter['type'] );
			if ( isset( $filters_properties[ $key ] ) ) {
				++$filters_properties[ $key ];
			} else {
				$filters_properties[ $key ] = 1;
			}
		}

		return $filters_properties;
	}

	/**
	 * Gets the active post types given a set of filters.
	 *
	 * @since 5.8.0
	 *
	 * @param array $filters The active filters for the current query.
	 *
	 * @return array The active post types.
	 */
	public static function get_active_post_types( $filters ) {
		$active_post_types = array();

		foreach ( $filters as $item ) {
			if ( ( 'post_type' === $item['type'] ) && isset( $item['query_vars']['post_type'] ) ) {
				$active_post_types[] = $item['query_vars']['post_type'];
			}
		}

		return $active_post_types;
	}

	/**
	 * Sets active to false on all post type buckets.
	 *
	 * @since 5.8.0
	 *
	 * @param array $filters The available filters for the current query.
	 *
	 * @return array The filters for the current query with modified active field.
	 */
	public static function remove_active_from_post_type_buckets( $filters ) {
		$modified = $filters;
		foreach ( $filters as $key => $filter ) {
			if ( 'post_type' === $filter['type'] && ! empty( $filter['buckets'] ) ) {
				foreach ( $filter['buckets'] as $k => $bucket ) {
					$bucket['active']                  = false;
					$modified[ $key ]['buckets'][ $k ] = $bucket;
				}
			}
		}

		return $modified;
	}

	/**
	 * Given a url and an array of post types, will ensure that the post types are properly applied to the URL as args.
	 *
	 * @since 5.8.0
	 *
	 * @param string $url        The URL to add post types to.
	 * @param array  $post_types An array of post types that should be added to the URL.
	 *
	 * @return string The URL with added post types.
	 */
	public static function add_post_types_to_url( $url, $post_types ) {
		$url = self::remove_query_arg( 'post_type', $url );
		if ( empty( $post_types ) ) {
			return $url;
		}

		$url = self::add_query_arg(
			'post_type',
			implode( ',', $post_types ),
			$url
		);

		return $url;
	}

	/**
	 * Since we provide support for the widget restricting post types by adding the selected post types as
	 * active filters, if removing a post type filter would result in there no longer be post_type args in the URL,
	 * we need to be sure to add them back.
	 *
	 * @since 5.8.0
	 *
	 * @param array $filters    An array of possible filters for the current query.
	 * @param array $post_types The post types to ensure are on the link.
	 *
	 * @return array The updated array of filters with post typed added to the remove URLs.
	 */
	public static function ensure_post_types_on_remove_url( $filters, $post_types ) {
		$modified = $filters;

		foreach ( (array) $filters as $filter_key => $filter ) {
			if ( 'post_type' !== $filter['type'] || empty( $filter['buckets'] ) ) {
				$modified[ $filter_key ] = $filter;
				continue;
			}

			foreach ( (array) $filter['buckets'] as $bucket_key => $bucket ) {
				if ( empty( $bucket['remove_url'] ) ) {
					continue;
				}

				$parsed = wp_parse_url( $bucket['remove_url'] );
				if ( ! $parsed ) {
					continue;
				}

				$query = array();
				if ( ! empty( $parsed['query'] ) ) {
					wp_parse_str( $parsed['query'], $query );
				}

				if ( empty( $query['post_type'] ) ) {
					$modified[ $filter_key ]['buckets'][ $bucket_key ]['remove_url'] = self::add_post_types_to_url(
						$bucket['remove_url'],
						$post_types
					);
				}
			}
		}

		return $modified;
	}

	/**
	 * Wraps a WordPress filter called "jetpack_search_disable_widget_filters" that allows
	 * developers to disable filters supplied by the search widget. Useful if filters are
	 * being defined at the code level.
	 *
	 * @since 5.8.0
	 *
	 * @return bool
	 */
	public static function are_filters_by_widget_disabled() {
		/**
		 * Allows developers to disable filters being set by widget, in favor of manually
		 * setting filters via `Classic_Search::set_filters()`.
		 *
		 * @module search
		 *
		 * @since  5.7.0
		 *
		 * @param bool false
		 */
		return apply_filters( 'jetpack_search_disable_widget_filters', false );
	}

	/**
	 * Returns the maximum posts per page for a search query.
	 *
	 * @since 5.8.0
	 *
	 * @return int
	 */
	public static function get_max_posts_per_page() {
		return Options::site_has_vip_index() ? 1000 : 100;
	}

	/**
	 * Resolves the effective results-per-page value for the Search 3.0 blocks.
	 *
	 * `$override` is the author-set `resultsPerPage` block attribute; `0` (or
	 * any non-positive value) means "use the site's `posts_per_page` Reading
	 * setting." A non-positive Reading setting (e.g. `-1`, "show all") falls
	 * back to 10 rather than clamping down to a single result. Either way the
	 * result is capped at `get_max_posts_per_page()`.
	 *
	 * @param int $override Author override, or 0 to use the site default.
	 * @return int Clamped, always-positive results-per-page value.
	 */
	public static function resolve_results_per_page( $override = 0 ) {
		$value = $override > 0 ? (int) $override : (int) get_option( 'posts_per_page' );
		if ( $value <= 0 ) {
			$value = 10;
		}
		return min( $value, self::get_max_posts_per_page() );
	}

	/**
	 * Returns the maximum offset for a search query.
	 *
	 * @since 5.8.0
	 *
	 * @return int
	 */
	public static function get_max_offset() {
		return Options::site_has_vip_index() ? 9000 : 1000;
	}

	/**
	 * Returns the maximum offset for a search query.
	 *
	 * @since 8.4.0
	 * @param string $locale    A potentially valid locale string.
	 *
	 * @return bool
	 */
	public static function is_valid_locale( $locale ) {
		if ( ! class_exists( 'GP_Locales' ) ) {
			// Assume locale to be valid if we can't check with GlotPress.
			return true;
		}
		return false !== GP_Locales::by_field( 'wp_locale', $locale );
	}

	/**
	 * Get the version number to use when loading the file. Allows us to bypass cache when developing.
	 *
	 * @since 8.6.0
	 * @param string $file Path of the file we are looking for.
	 * @return string $script_version Version number.
	 */
	public static function get_asset_version( $file ) {
		return Package::is_development_version() && file_exists( Package::get_installed_path() . $file )
			? filemtime( Package::get_installed_path() . $file )
			: Package::VERSION;
	}

	/**
	 * Generates a customizer settings ID for a given post type.
	 *
	 * @since 8.8.0
	 * @param object $post_type Post type object returned from get_post_types.
	 * @return string $customizer_id Customizer setting ID.
	 */
	public static function generate_post_type_customizer_id( $post_type ) {
		return Options::OPTION_PREFIX . 'disable_post_type_' . $post_type->name;
	}

	/**
	 * Generates an array of post types associated with their customizer IDs.
	 *
	 * @since 8.8.0
	 * @return array $ids Post type => post type customizer ID object.
	 */
	public static function generate_post_type_customizer_ids() {
		return array_map(
			array( 'self', 'generate_post_type_customizer_id' ),
			get_post_types( array( 'exclude_from_search' => false ), 'objects' )
		);
	}

	/**
	 * Sanitizes a checkbox value for writing to the database.
	 *
	 * @since 8.9.0
	 *
	 * @param mixed $value from the customizer form.
	 * @return string either '0' or '1'.
	 */
	public static function sanitize_checkbox_value( $value ) {
		return true === $value ? '1' : '0';
	}

	/**
	 * Sanitizes a checkbox value for rendering the Customizer.
	 *
	 * @since 8.9.0
	 *
	 * @param mixed $value from the database.
	 * @return boolean
	 */
	public static function sanitize_checkbox_value_for_js( $value ) {
		return '1' === $value;
	}

	/**
	 * Passes all options to the JS app.
	 */
	public static function generate_initial_javascript_state() {
		$widget_options = self::get_widgets_from_option();
		if ( is_array( $widget_options ) ) {
			$widget_options = end( $widget_options );
		}

		$overlay_widget_ids      = is_active_sidebar( Instant_Search::INSTANT_SEARCH_SIDEBAR ) ?
			wp_get_sidebars_widgets()[ Instant_Search::INSTANT_SEARCH_SIDEBAR ] : array();
		$filters                 = self::get_filters_from_widgets();
		$widgets                 = array();
		$widgets_outside_overlay = array();
		foreach ( $filters as $key => &$filter ) {
			$filter['filter_id'] = $key;

			if ( in_array( $filter['widget_id'], $overlay_widget_ids, true ) ) {
				if ( ! isset( $widgets[ $filter['widget_id'] ] ) ) {
					$widgets[ $filter['widget_id'] ]['filters']   = array();
					$widgets[ $filter['widget_id'] ]['widget_id'] = $filter['widget_id'];
				}
				$widgets[ $filter['widget_id'] ]['filters'][] = $filter;
			} else {
				if ( ! isset( $widgets_outside_overlay[ $filter['widget_id'] ] ) ) {
					$widgets_outside_overlay[ $filter['widget_id'] ]['filters']   = array();
					$widgets_outside_overlay[ $filter['widget_id'] ]['widget_id'] = $filter['widget_id'];
				}
				$widgets_outside_overlay[ $filter['widget_id'] ]['filters'][] = $filter;
			}
		}
		unset( $filter );

		$has_non_search_widgets = false;
		foreach ( $overlay_widget_ids as $overlay_widget_id ) {
			if ( strpos( $overlay_widget_id, self::FILTER_WIDGET_BASE ) === false ) {
				$has_non_search_widgets = true;
				break;
			}
		}

		$post_type_objs   = get_post_types( array( 'exclude_from_search' => false ), 'objects' );
		$post_type_labels = array();
		foreach ( $post_type_objs as $key => $obj ) {
			$post_type_labels[ $key ] = array(
				'singular_name' => $obj->labels->singular_name,
				'name'          => $obj->labels->name,
			);
		}

		$prefix         = Options::OPTION_PREFIX;
		$posts_per_page = (int) get_option( 'posts_per_page' );
		if ( ( $posts_per_page > 20 ) || ( $posts_per_page <= 0 ) ) {
			$posts_per_page = 20;
		}

		$excluded_post_types   = get_option( $prefix . 'excluded_post_types' ) ? explode( ',', get_option( $prefix . 'excluded_post_types', '' ) ) : array();
		$post_types            = array_values(
			get_post_types(
				array(
					'exclude_from_search' => false,
					'public'              => true,
				)
			)
		);
		$unexcluded_post_types = array_diff( $post_types, $excluded_post_types );
		// NOTE: If all post types are being excluded, ignore the option value.
		if ( array() === $unexcluded_post_types ) {
			$excluded_post_types = array();
		}

		$is_wpcom                  = static::is_wpcom();
		$is_private_site           = ( new Status() )->is_private_site();
		$is_jetpack_photon_enabled = method_exists( 'Jetpack', 'is_module_active' ) && Jetpack::is_module_active( 'photon' );

		$options = array(
			'overlayOptions'              => array(
				'colorTheme'                  => get_option( $prefix . 'color_theme', 'light' ),
				'enableInfScroll'             => get_option( $prefix . 'inf_scroll', '1' ) === '1',
				'enableFilteringOpensOverlay' => get_option( $prefix . 'filtering_opens_overlay', '1' ) === '1',
				'enablePostDate'              => get_option( $prefix . 'show_post_date', '1' ) === '1',
				'enableProductPrice'          => get_option( $prefix . 'show_product_price', '1' ) === '1',
				'enableSort'                  => get_option( $prefix . 'enable_sort', '1' ) === '1',
				'highlightColor'              => get_option( $prefix . 'highlight_color', '#FFC' ),
				'overlayTrigger'              => get_option( $prefix . 'overlay_trigger', Options::DEFAULT_OVERLAY_TRIGGER ),
				'resultFormat'                => get_option( $prefix . 'result_format', Options::RESULT_FORMAT_MINIMAL ),
				'showPoweredBy'               => ( new Plan() )->is_free_plan() || ( get_option( $prefix . 'show_powered_by', '1' ) === '1' ),

				// These options require kicking off a new search.
				'defaultSort'                 => get_option( $prefix . 'default_sort', 'relevance' ),
				'excludedPostTypes'           => $excluded_post_types,

				// Fallback image options
				'fallbackImageUrl'            => get_option( $prefix . 'fallback_image_url', '' ),
				'enableFallbackImage'         => get_option( $prefix . 'enable_fallback_image', '0' ) === '1',
			),

			// core config.
			'homeUrl'                     => home_url(),
			'locale'                      => str_replace( '_', '-', self::is_valid_locale( get_locale() ) ? get_locale() : 'en_US' ),
			'postsPerPage'                => $posts_per_page,
			'siteId'                      => self::get_wpcom_site_id(),
			'searchSuggestionsEnabled'    => (bool) get_option( 'jetpack_search_suggestions_enabled', false ),
			'postTypes'                   => $post_type_labels,
			'webpackPublicPath'           => plugins_url( '/build/instant-search/', __DIR__ ),
			'isPhotonEnabled'             => ( $is_wpcom || $is_jetpack_photon_enabled ) && ! $is_private_site,
			'isFreePlan'                  => ( new Plan() )->is_free_plan(),

			// config values related to private site support.
			'apiRoot'                     => esc_url_raw( rest_url() ),
			'apiNonce'                    => wp_create_nonce( 'wp_rest' ),
			'isPrivateSite'               => $is_private_site,
			'isWpcom'                     => $is_wpcom,

			// widget info.
			'hasOverlayWidgets'           => is_countable( $overlay_widget_ids ) && count( $overlay_widget_ids ) > 0,
			'widgets'                     => array_values( $widgets ),
			'widgetsOutsideOverlay'       => array_values( $widgets_outside_overlay ),
			'hasNonSearchWidgets'         => $has_non_search_widgets,
			/**
			 * Whether to prevent tracking cookie reset. More information `pbmxuV-39H-p2`.
			 *
			 * @module search
			 *
			 * @since 0.41.0
			 *
			 * @param bool Prevent cookie reset for automattic sites as default value.
			 */
			'preventTrackingCookiesReset' => apply_filters( 'jetpack_instant_search_prevent_tracking_cookies_reset', function_exists( 'is_automattic' ) && is_automattic() ),

			/**
			 * Whether to disable Tracks and TrainTracks analytics.
			 *
			 * This can be enabled via URL parameter (?disable_tracking=1) for testing,
			 * or via the filter for permanent configuration. Useful for debugging issues
			 * where tracking may interfere with search functionality, such as Safari's
			 * advanced tracking protection.
			 *
			 * @module search
			 *
			 * @since 0.56.0
			 *
			 * @param bool $disable_tracking Whether to disable tracking. Default false.
			 */
			'disableTracking'             => self::is_tracking_disabled() || apply_filters( 'jetpack_instant_search_disable_tracking', false ),
			'aiAnswersEnabled'            => AI_Answers::is_enabled(),
			'aiMasterEnabled'             => AI_Answers::is_master_enabled(),
		);

		/**
		 * Customize Instant Search Options.
		 *
		 * @module search
		 *
		 * @since 7.7.0
		 *
		 * @param array $options Array of parameters used in Instant Search queries.
		 */
		return apply_filters( 'jetpack_instant_search_options', $options );
	}

	/**
	 * Default highlight fields when `highlightFields` is unset in
	 * `jetpack_instant_search_options`. Matches instant search's JS default.
	 *
	 * @since 7.4.0
	 */
	const DEFAULT_INSTANT_SEARCH_HIGHLIGHT_FIELDS = array( 'title', 'content', 'comments' );

	/**
	 * Fields added to API `fields` when searching additional blogs.
	 *
	 * @since 7.4.0
	 */
	const MULTISITE_SEARCH_FIELD_NAMES = array( 'author', 'blog_name', 'blog_icon_url', 'blog_id' );

	/**
	 * Read Instant Search query-customization options from a filtered options array.
	 *
	 * @since 7.4.0
	 *
	 * @param array $options Raw `jetpack_instant_search_options` value.
	 * @return array Query options with keys:
	 *               `highlightPhraseOnly`, `highlightFilterStopwords`, `highlightFields`,
	 *               `additionalBlogIds`, `adminQueryFilter`, and `customResults`.
	 */
	public static function parse_instant_search_query_options( array $options ): array {
		$highlight_phrase_only = ! empty( $options['highlightPhraseOnly'] );

		// The v1.3 API rejects requests combining `highlight_filter_stopwords` with
		// `highlight_phrase_only` (phrase-only wins server-side) — drop the stopword
		// list so requests stay valid when a filter sets both.
		$stopwords = array();
		if ( ! $highlight_phrase_only && ! empty( $options['highlightFilterStopwords'] ) && is_array( $options['highlightFilterStopwords'] ) ) {
			$stopwords = array_values(
				array_filter(
					$options['highlightFilterStopwords'],
					static function ( $word ) {
						return is_string( $word ) && '' !== $word;
					}
				)
			);
		}

		$highlight_fields = null;
		if ( ! empty( $options['highlightFields'] ) && is_array( $options['highlightFields'] ) ) {
			$highlight_fields = array_values(
				array_filter(
					$options['highlightFields'],
					static function ( $field ) {
						return is_string( $field ) && '' !== $field;
					}
				)
			);
			if ( array() === $highlight_fields ) {
				$highlight_fields = null;
			}
		}

		$additional_blog_ids = array();
		if ( ! empty( $options['additionalBlogIds'] ) && is_array( $options['additionalBlogIds'] ) ) {
			$additional_blog_ids = array_values( $options['additionalBlogIds'] );
		}

		$admin_query_filter = null;
		if ( ! empty( $options['adminQueryFilter'] ) && is_array( $options['adminQueryFilter'] ) ) {
			$admin_query_filter = $options['adminQueryFilter'];
		}

		$custom_results = array();
		if ( ! empty( $options['customResults'] ) && is_array( $options['customResults'] ) ) {
			foreach ( $options['customResults'] as $rule ) {
				if ( ! is_array( $rule ) ) {
					continue;
				}
				$pattern = isset( $rule['pattern'] ) && is_string( $rule['pattern'] ) ? $rule['pattern'] : '';
				$ids     = isset( $rule['ids'] ) && is_array( $rule['ids'] ) ? array_values( $rule['ids'] ) : array();
				if ( '' === $pattern || array() === $ids ) {
					continue;
				}
				$custom_results[] = array(
					'pattern' => $pattern,
					'ids'     => $ids,
				);
			}
		}

		return array(
			'highlightPhraseOnly'      => $highlight_phrase_only,
			'highlightFilterStopwords' => $stopwords,
			'highlightFields'          => $highlight_fields,
			'additionalBlogIds'        => $additional_blog_ids,
			'adminQueryFilter'         => $admin_query_filter,
			'customResults'            => $custom_results,
		);
	}

	/**
	 * Read Instant Search query-customization options via `jetpack_instant_search_options`.
	 *
	 * Passing an empty array into the filter matches `Filter_Static::read_raw_entries()`
	 * — callbacks only add keys.
	 *
	 * @since 7.4.0
	 *
	 * @return array Query options with keys:
	 *               `highlightPhraseOnly`, `highlightFilterStopwords`, `highlightFields`,
	 *               `additionalBlogIds`, `adminQueryFilter`, and `customResults`.
	 */
	public static function get_instant_search_query_options(): array {
		$options = apply_filters( 'jetpack_instant_search_options', array() );
		if ( ! is_array( $options ) ) {
			$options = array();
		}

		return self::parse_instant_search_query_options( $options );
	}

	/**
	 * Merge Instant Search query-customization options into v1.3 API args.
	 *
	 * Shared by Inline Search (Theme) and any server-side v1.3 callers.
	 *
	 * @since 7.4.0
	 *
	 * @param array      $api_query_args API query arguments.
	 * @param array|null $options        Filtered `jetpack_instant_search_options` value. Defaults to `generate_initial_javascript_state()`.
	 * @return array
	 */
	public static function apply_instant_search_query_options_to_api_args( array $api_query_args, ?array $options = null ): array {
		if ( null === $options ) {
			$options = self::generate_initial_javascript_state();
		}
		if ( ! is_array( $options ) ) {
			return $api_query_args;
		}

		$query_options = self::parse_instant_search_query_options( $options );

		if ( null !== $query_options['adminQueryFilter'] ) {
			$api_query_args['filter'] = array(
				'bool' => array(
					'filter' => $api_query_args['filter'] ?? array(),
					'must'   => $query_options['adminQueryFilter'],
				),
			);
		}

		if ( $query_options['highlightPhraseOnly'] ) {
			$api_query_args['highlight_phrase_only'] = true;
		}

		if ( ! empty( $query_options['highlightFilterStopwords'] ) ) {
			$api_query_args['highlight_filter_stopwords'] = $query_options['highlightFilterStopwords'];
		}

		if ( null !== $query_options['highlightFields'] ) {
			$api_query_args['highlight_fields'] = $query_options['highlightFields'];
			$api_query_args['highlight']        = array(
				'fields' => $query_options['highlightFields'],
			);
		}

		if ( ! empty( $query_options['additionalBlogIds'] ) ) {
			$api_query_args['additional_blog_ids'] = $query_options['additionalBlogIds'];
			$fields                                = isset( $api_query_args['fields'] ) && is_array( $api_query_args['fields'] )
				? $api_query_args['fields']
				: array();
			$api_query_args['fields']              = array_values(
				array_unique( array_merge( $fields, self::MULTISITE_SEARCH_FIELD_NAMES ) )
			);
		}

		$matched_custom_results = self::resolve_instant_search_custom_results(
			(string) ( $api_query_args['query'] ?? '' ),
			$query_options['customResults']
		);
		if ( null !== $matched_custom_results ) {
			$api_query_args['custom_results'] = $matched_custom_results;
		}

		return $api_query_args;
	}

	/**
	 * Resolve `customResults` post IDs for a search query.
	 *
	 * Mirrors instant search's exact / `regex:` pattern matching.
	 *
	 * @since 7.4.0
	 *
	 * @param string $query          Current search query.
	 * @param array  $custom_results Normalized custom-results rules.
	 * @return array<int, int|string>|null
	 */
	public static function resolve_instant_search_custom_results( string $query, array $custom_results ): ?array {
		if ( array() === $custom_results ) {
			return null;
		}

		foreach ( $custom_results as $rule ) {
			$pattern = $rule['pattern'];
			$ids     = $rule['ids'];
			if ( 0 === strpos( $pattern, 'regex:' ) ) {
				// Escape the delimiter so patterns containing `/` (e.g. `regex:docs/.*`) stay valid PCRE.
				$regex = '/^' . str_replace( '/', '\/', substr( $pattern, strlen( 'regex:' ) ) ) . '$/';
				if ( @preg_match( $regex, $query ) ) { // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- Invalid user regex should be skipped, not fatal.
					return $ids;
				}
			} elseif ( $query === $pattern ) {
				return $ids;
			}
		}

		return null;
	}

	/**
	 * Returns true if the site is a WordPress.com simple site, i.e. the code runs on WPCOM.
	 */
	public static function is_wpcom() {
		return defined( 'IS_WPCOM' ) && constant( 'IS_WPCOM' );
	}

	/**
	 * Prints the Instant Search sidebar.
	 */
	public static function print_instant_search_sidebar() {
		?>
		<div class="jetpack-instant-search__widget-area" style="display: none">
			<?php if ( is_active_sidebar( Instant_Search::INSTANT_SEARCH_SIDEBAR ) ) { ?>
				<?php dynamic_sidebar( Instant_Search::INSTANT_SEARCH_SIDEBAR ); ?>
			<?php } ?>
		</div>
		<?php
	}

	/**
	 * Gets all of the active plugins via site options.
	 * Forked from Jetpack::get_active_plugins from the Jetpack plugin.
	 *
	 * @return string[]
	 */
	public static function get_active_plugins() {
		// active_plugins plugins as values.
		$active_plugins = (array) get_option( 'active_plugins', array() );

		// active_sitewide_plugins stores plugins as keys.
		if ( is_multisite() ) {
			$network_plugins = array_keys( get_site_option( 'active_sitewide_plugins', array() ) );
			if ( $network_plugins ) {
				$active_plugins = array_merge( $active_plugins, $network_plugins );
			}
		}

		sort( $active_plugins );
		return array_unique( $active_plugins );
	}

	/**
	 * Get the current site's WordPress.com ID.
	 *
	 * @return int Blog ID.
	 */
	public static function get_wpcom_site_id() {
		// Returns local blog ID for a multi-site network.
		if ( defined( 'IS_WPCOM' ) && constant( 'IS_WPCOM' ) ) {
			return \get_current_blog_id();
		}

		// Returns cache site ID.
		return \Jetpack_Options::get_option( 'id' );
	}

	/**
	 * Returns true if the free_plan is set to not empty in URL, which is used for testing purpose.
	 */
	public static function is_forced_free_plan() {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash
		return isset( $_GET['free_plan'] ) && $_GET['free_plan'];
	}

	/**
	 * Returns true if the new_pricing_202210 is set to not empty in URL for testing purpose.
	 */
	public static function is_forced_new_pricing_202208() {
		$referrer = wp_get_referer();
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash
		return ( isset( $_GET['new_pricing_202208'] ) && $_GET['new_pricing_202208'] ) || $referrer && strpos( $referrer, 'new_pricing_202208=1' ) !== false;
	}

	/**
	 * Returns true if tracking should be disabled via URL parameter, which is used for testing purposes.
	 *
	 * @since 0.56.0
	 *
	 * @return bool
	 */
	public static function is_tracking_disabled() {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash
		return isset( $_GET['disable_tracking'] ) && $_GET['disable_tracking'];
	}

	/**
	 * Enqueue the WordPress.com Tracks library that drains `window._tkq` and
	 * sends the queued events. Shared by Instant Search and the Search blocks so
	 * the handle, src, and cache-busting version live in one place. Callers own
	 * the decision of whether to load it (e.g. the `is_tracking_disabled()` gate).
	 */
	public static function enqueue_tracks_script() {
		wp_enqueue_script( 'jp-tracks', '//stats.wp.com/w.js', array(), gmdate( 'YW' ), true );
	}
}