<?php
/**
 * Accesswell_Urls
 *
 * Pages the site scan visits: the homepage, the blog page, and published
 * content of the chosen post types, newest first, up to the limit set in
 * Settings.
 *
 * @package Accesswell
 */

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

class Accesswell_Urls {

	/**
	 * @return array List of { path, post_id, title }.
	 */
	public static function to_scan() {
		$max  = Accesswell_Settings::get()['max_pages'];
		$out  = array();
		$seen = array();

		$add = function ( $url, $post_id, $title ) use ( &$out, &$seen ) {
			$path = self::path_of( $url );
			if ( null === $path || isset( $seen[ $path ] ) ) {
				return;
			}
			$seen[ $path ] = true;
			$out[]         = array(
				'path'    => $path,
				'post_id' => (int) $post_id,
				'title'   => $title,
			);
		};

		$front = 'page' === get_option( 'show_on_front' ) ? (int) get_option( 'page_on_front' ) : 0;
		$add( home_url( '/' ), $front, __( 'Homepage', 'accesswell' ) );

		$blog = (int) get_option( 'page_for_posts' );
		if ( $blog ) {
			$add( get_permalink( $blog ), $blog, get_the_title( $blog ) );
		}

		$ids = get_posts(
			array(
				'post_type'        => Accesswell_Settings::post_types(),
				'post_status'      => 'publish',
				'posts_per_page'   => $max,
				'orderby'          => 'modified',
				'order'            => 'DESC',
				'fields'           => 'ids',
				'has_password'     => false,
				'suppress_filters' => true,
			)
		);
		foreach ( $ids as $id ) {
			if ( count( $out ) >= $max ) {
				break;
			}
			$add( get_permalink( $id ), $id, get_the_title( $id ) );
		}

		return array_slice( $out, 0, $max );
	}

	/**
	 * Path of a site address relative to the home address, or null.
	 *
	 * @param string $url Address.
	 * @return string|null
	 */
	public static function path_of( $url ) {
		$home = wp_parse_url( home_url( '/' ) );
		$part = wp_parse_url( (string) $url );
		if ( empty( $part['host'] ) || strtolower( $part['host'] ) !== strtolower( $home['host'] ) ) {
			return null;
		}
		$home_path = trailingslashit( isset( $home['path'] ) ? $home['path'] : '/' );
		$path      = isset( $part['path'] ) ? $part['path'] : '/';
		if ( 0 === strpos( trailingslashit( $path ), $home_path ) ) {
			$path = '/' . ltrim( substr( $path, strlen( $home_path ) ), '/' );
		}
		return $path . ( isset( $part['query'] ) ? '?' . $part['query'] : '' );
	}
}