<?php

/**
 * LP_Autoloader
 *
 * @author  ThimPress
 * @package LearnPress/Classes
 * @version 1.0
 */

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

class LP_Autoloader {

	/**
	 * Path to the includes directory
	 * @var string
	 */
	private $include_path = '';

	protected $time = 0;

	/**
	 * The Constructor
	 */
	public function __construct() {
		if ( function_exists( '__autoload' ) ) {
			spl_autoload_register( '__autoload' );
		}

		spl_autoload_register( array( $this, 'autoload' ) );

		$this->include_path = untrailingslashit( LP_PLUGIN_PATH ) . '/inc/';

		add_action( 'shutdown', array( $this, 'output_time' ) );
	}

	public function output_time() {
	}

	/**
	 * Take a class name and turn it into a file name
	 *
	 * @param  string $class
	 *
	 * @return string
	 */
	private function get_file_name_from_class( $class ) {
		return 'class-' . str_replace( '_', '-', strtolower( $class ) ) . '.php';
	}

	/**
	 * Include a class file
	 *
	 * @param  string $path
	 *
	 * @return bool successful or not
	 */
	private function load_file( $path ) {
		if ( $path && is_readable( $path ) ) {
			include_once( $path );

			return true;
		}

		return false;
	}

	/**
	 *
	 * @param string $class
	 */
	public function autoload( $class ) {
		$class = strtolower( $class );
		$start = microtime( true );
		$file  = $this->get_file_name_from_class( $class );

		if ( preg_match( '~^lp_abstract_shortcode(.*)$~', $class, $m ) ) {
			$file = 'abstract-shortcode' . str_replace( '_', '-', $m[1] ) . '.php';
			$path = $this->include_path . 'abstracts/';
		} elseif ( preg_match( '~^lp_shortcode_(.*)$~', $class, $m ) ) {
			$path = $this->include_path . 'shortcodes/';
		} else {

			// payment gateways
			if ( strpos( $class, 'lp_gateway_' ) === 0 ) {
				$path = $this->include_path . 'gateways/' . substr( str_replace( '_', '-', $class ), 11 ) . '/';
			} elseif ( preg_match( '!lp_meta_box_|rwmb_!', $class, $matches ) ) { // meta box fields

				$file = 'class-' . substr( str_replace( '_', '-', $class ), 5 ) . '.php';
				$path = $this->include_path . 'admin/meta-boxes/';

			} else {
				$file = 'class-' . str_replace( '_', '-', $class ) . '.php';
				$path = dirname( __FILE__ ) . '/';
				if ( strpos( $class, 'lp_user' ) !== false || $class == 'lp_abstract_user' ) {
					$path .= 'user/';
				}

				if ( ! file_exists( $path . $file ) ) {
					$segs = explode( '_', $class );
					if ( ! empty( $segs[1] ) ) {
						$path .= $segs[1] . '/';
					}
				}
			}
		}
		$this->time += ( microtime( true ) - $start );
		$this->load_file( $path . $file );
	}
}

new LP_Autoloader();
