<?php
/**
 * Widget extractor.
 *
 * @package Unbreak
 */

namespace Unbreak\Extract;

defined( 'ABSPATH' ) || exit;

/**
 * Text, Custom HTML and block widgets placed in an active sidebar.
 */
final class WidgetExtractor {

	public const SOURCE_TYPE = 'widget';

	/**
	 * Widget option name => instance field holding the HTML.
	 */
	public const WIDGETS = array(
		'widget_text'        => 'text',
		'widget_custom_html' => 'content',
		'widget_block'       => 'content',
	);

	/**
	 * All links in active widgets.
	 *
	 * @param bool $include_images Include images.
	 * @return array<int,array{source_id:int,source_key:string,links:array<int,array{url:string,element:string,anchor_text:string,context:string,source_key:string}>}>
	 */
	public static function extract_all( bool $include_images = true ): array {
		$active = self::active_widget_ids();
		$home   = home_url( '/' );
		$result = array();

		foreach ( self::WIDGETS as $option => $field ) {
			$id_base   = substr( $option, strlen( 'widget_' ) );
			$instances = get_option( $option, array() );
			if ( ! is_array( $instances ) ) {
				continue;
			}
			foreach ( $instances as $number => $instance ) {
				if ( ! is_int( $number ) || ! is_array( $instance ) || ! isset( $active[ $id_base . '-' . $number ] ) ) {
					continue;
				}
				$html = isset( $instance[ $field ] ) && is_string( $instance[ $field ] ) ? $instance[ $field ] : '';
				if ( '' === $html ) {
					continue;
				}
				$links = PostContentExtractor::extract( $html, $home, $include_images );
				if ( empty( $links ) ) {
					continue;
				}
				$title = isset( $instance['title'] ) && is_string( $instance['title'] ) && '' !== $instance['title'] ? $instance['title'] : $id_base . '-' . $number;
				foreach ( $links as &$link ) {
					$link['source_key'] = $option;
					/* translators: %s: widget title or ID. */
					$link['context'] = '' !== $link['context'] ? $link['context'] : sprintf( __( 'Widget: %s', 'unbreak' ), $title );
				}
				unset( $link );
				$result[] = array(
					'source_id'  => $number,
					'source_key' => $option,
					'links'      => $links,
				);
			}
		}
		return $result;
	}

	/**
	 * Widget IDs (e.g. "text-2") placed in any sidebar except the inactive area.
	 *
	 * @return array<string,true>
	 */
	private static function active_widget_ids(): array {
		$sidebars = get_option( 'sidebars_widgets', array() );
		$active   = array();
		if ( ! is_array( $sidebars ) ) {
			return $active;
		}
		foreach ( $sidebars as $sidebar => $widgets ) {
			if ( 'wp_inactive_widgets' === $sidebar || ! is_array( $widgets ) ) {
				continue;
			}
			foreach ( $widgets as $widget_id ) {
				if ( is_string( $widget_id ) ) {
					$active[ $widget_id ] = true;
				}
			}
		}
		return $active;
	}
}