<?php
/**
 * Where the class loader (404-emails.php) finds each of this plugin's
 * classes - deliberately not a Composer autoloader. Files follow the
 * WordPress naming convention, so the mapping is a pure string transform:
 *
 *   Emails404\Forms_Page                       → class-forms-page.php
 *   Emails404\Integration_Provider_Interface   → interface-integration-provider.php
 *   Emails404\Providers\WPForms_Provider       → providers/class-wpforms-provider.php
 *
 * tests/test-autoload.php checks every file in includes/ against it.
 *
 * @package Emails404
 */

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

/**
 * @param string $class_name Fully qualified class or interface name.
 * @param string $base_dir   The includes/ directory, with a trailing slash.
 * @return string|null Null for anything outside the Emails404 namespace.
 */
function emails404_class_path( $class_name, $base_dir ) {
	if ( 0 !== strpos( $class_name, 'Emails404\\' ) ) {
		return null;
	}
	$parts = explode( '\\', substr( $class_name, strlen( 'Emails404\\' ) ) );
	$name  = array_pop( $parts );

	$suffix       = '_Interface';
	$is_interface = strlen( $name ) > strlen( $suffix ) && substr( $name, -strlen( $suffix ) ) === $suffix;
	if ( $is_interface ) {
		$name = substr( $name, 0, -strlen( $suffix ) );
	}

	$sub_dir = '';
	foreach ( $parts as $part ) {
		$sub_dir .= strtolower( str_replace( '_', '-', $part ) ) . '/';
	}
	return $base_dir . $sub_dir . ( $is_interface ? 'interface-' : 'class-' ) . strtolower( str_replace( '_', '-', $name ) ) . '.php';
}