<?php
/**
 * The WFOCUKirki autoloader.
 * Handles locating and loading other class-files.
 *
 * @package     WFOCUKirki
 * @category    Core
 * @author      Aristeides Stathopoulos
 * @copyright   Copyright (c) 2017, Aristeides Stathopoulos
 * @license     http://opensource.org/licenses/https://opensource.org/licenses/MIT
 * @since       1.0
 */
if ( ! class_exists( 'WFOCUKirki_Autoload' ) ) {
	/**
	 * Autoloader class.
	 *
	 * @since 3.0.10
	 */
	class WFOCUKirki_Autoload {

		/**
		 * Cached paths.
		 *
		 * @access private
		 * @since 3.0.10
		 * @var array
		 */
		private $cached_paths = array();

		/**
		 * Class constructor.
		 *
		 * @access public
		 * @since 3.0.10
		 */
		public function __construct() {

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

		/**
		 * The WFOCUKirki class autoloader.
		 * Finds the path to a class that we're requiring and includes the file.
		 *
		 * @access protected
		 *
		 * @param string $class_name The name of the class we're trying to load.
		 *
		 * @since 3.0.10
		 *
		 */
		protected function autoload( $class_name ) {

			// Not a WFOCUKirki file, early exit.
			if ( 0 !== stripos( $class_name, 'WFOCUKirki' ) ) {
				return;
			}

			// Check if we've got it cached and ready.
			if ( isset( $this->cached_paths[ $class_name ] ) && file_exists( $this->cached_paths[ $class_name ] ) ) {
				include_once $this->cached_paths[ $class_name ];

				return;
			}

			$paths = $this->get_paths( $class_name );

			foreach ( $paths as $path ) {
				$path = wp_normalize_path( $path );
				if ( file_exists( $path ) ) {
					$this->cached_paths[ $class_name ] = $path;
					include_once $path;

					return;
				}
			}
		}

		/**
		 * Get an array of possible paths for the file.
		 *
		 * @access protected
		 *
		 * @param string $class_name The name of the class we're trying to load.
		 *
		 * @return array
		 * @since 3.0.10
		 *
		 */
		protected function get_paths( $class_name ) {

			$paths = array();
			// Build the filename.
			$class_name = str_replace( 'WFOCU', '', $class_name );

			$filename = 'class-' . strtolower( str_replace( '_', '-', $class_name ) ) . '.php';

			// Break class-name is parts.
			$name_parts = explode( '_', str_replace( 'Kirki_', '', $class_name ) );

			// Handle modules loading.
			if ( isset( $name_parts[0] ) && 'Modules' === $name_parts[0] ) {
				$path    = dirname( __FILE__ ) . '/modules/';
				$path    .= strtolower( str_replace( '_', '-', str_replace( 'Kirki_Modules_', '', $class_name ) ) ) . '/';
				$paths[] = $path . $filename;
			}

			if ( isset( $name_parts[0] ) ) {

				// Handle controls loading.
				if ( 'Control' === $name_parts[0] || 'Settings' === $name_parts[0] ) {
					$path    = dirname( __FILE__ ) . '/controls/php/';
					$paths[] = $path . $filename;
				}
			}

			$paths[] = dirname( __FILE__ ) . '/core/' . $filename;
			$paths[] = dirname( __FILE__ ) . '/lib/' . $filename;

			$substr   = str_replace( 'Kirki_', '', $class_name );
			$exploded = explode( '_', $substr );
			$levels   = count( $exploded );

			$previous_path = '';
			for ( $i = 0; $i < $levels; $i ++ ) {
				$paths[]       = dirname( __FILE__ ) . '/' . $previous_path . strtolower( $exploded[ $i ] ) . '/' . $filename;
				$previous_path .= strtolower( $exploded[ $i ] ) . '/';
			}

			return $paths;
		}
	}
}