<?php
/**
 * Content with block rules, for the Dashboard.
 *
 * @package Yangra\Conditional
 */

namespace Yangra\Conditional\Blocks;

use Yangra\Conditional\Index\ContentIndex;

defined( 'ABSPATH' ) || exit;

/**
 * Lists the posts, templates and patterns that have blocks with an active
 * rule, from the content index (published and private content only), newest
 * first. Navigation items are left out: they're listed as menu items.
 */
class BlocksWithRules {

	/**
	 * Post types listed as templates: templates, template parts and Navigation menus.
	 */
	const TEMPLATE_TYPES = array( 'wp_template', 'wp_template_part', 'wp_navigation' );

	/**
	 * Post type of synced patterns.
	 */
	const PATTERN_TYPE = 'wp_block';

	/**
	 * Content index.
	 *
	 * @var ContentIndex
	 */
	private $index;

	/**
	 * Constructor.
	 *
	 * @param ContentIndex $index Content index.
	 */
	public function __construct( ContentIndex $index ) {
		$this->index = $index;
	}

	/**
	 * Every post the current user can edit that has blocks with an active
	 * rule, most recently changed first.
	 *
	 * `kind` is "template", "pattern" or "post" (any other content type).
	 *
	 * @return array<int, array{id: int, title: string, type: string, kind: string, blocks: int, edit_url: string, modified: int}>
	 */
	public function all(): array {
		$items = array();
		foreach ( $this->index->live_posts() as $post_id => $index ) {
			$blocks = (int) ( $index['blocks'] ?? 0 ) - (int) ( $index['menu_items'] ?? 0 );
			if ( $blocks < 1 || ! current_user_can( 'edit_post', $post_id ) ) {
				continue;
			}

			$post = get_post( $post_id );
			if ( null === $post ) {
				continue;
			}

			$type    = get_post_type_object( $post->post_type );
			$items[] = array(
				'id'       => (int) $post_id,
				'title'    => trim( html_entity_decode( wp_strip_all_tags( $post->post_title ), ENT_QUOTES, 'UTF-8' ) ),
				'type'     => null !== $type ? (string) $type->labels->singular_name : $post->post_type,
				'kind'     => self::kind( $post->post_type ),
				'blocks'   => $blocks,
				'edit_url' => (string) get_edit_post_link( $post_id, 'raw' ),
				'modified' => (int) strtotime( $post->post_modified_gmt . ' UTC' ),
			);
		}

		usort(
			$items,
			static function ( array $a, array $b ): int {
				return array( $b['modified'], $a['id'] ) <=> array( $a['modified'], $b['id'] );
			}
		);

		return $items;
	}

	/**
	 * How a post type is counted on the Dashboard.
	 *
	 * @param string $post_type Post type.
	 * @return string "template", "pattern" or "post".
	 */
	public static function kind( string $post_type ): string {
		if ( in_array( $post_type, self::TEMPLATE_TYPES, true ) ) {
			return 'template';
		}

		return self::PATTERN_TYPE === $post_type ? 'pattern' : 'post';
	}
}