<?php
/**
 * PSR-4-style autoloader using WordPress file naming.
 *
 * AccessNow\Replica\Source\Request_Guard -> includes/source/class-request-guard.php
 *
 * @package AccessNow\Replica
 */

namespace AccessNow\Replica;

defined( 'ABSPATH' ) || exit;

/**
 * Maps plugin classes to files.
 */
final class Autoloader {

	const PREFIX = __NAMESPACE__ . '\\';

	/**
	 * Registers the autoloader.
	 */
	public static function register() {
		spl_autoload_register( array( __CLASS__, 'load' ) );
	}

	/**
	 * Loads a class file if it belongs to this plugin.
	 *
	 * @param string $class_name Fully qualified class name.
	 */
	public static function load( $class_name ) {
		if ( 0 !== strpos( $class_name, self::PREFIX ) ) {
			return;
		}

		$parts = explode( '\\', substr( $class_name, strlen( self::PREFIX ) ) );
		$class = array_pop( $parts );
		$dirs  = array_map(
			static function ( $dir ) {
				return strtolower( str_replace( '_', '-', $dir ) );
			},
			$parts
		);
		$file  = 'class-' . strtolower( str_replace( '_', '-', $class ) ) . '.php';
		$path  = ACCESSNOW_REPLICA_DIR . 'includes/' . ( $dirs ? implode( '/', $dirs ) . '/' : '' ) . $file;

		if ( is_readable( $path ) ) {
			require_once $path;
		}
	}
}