<?php

/**
 * 
 * 
 * 
 */

abstract class Advertikon {

	/** @var $FILE string child's __FILE__ */
	protected $FILE = null;
	protected $name = '';
	protected $class_prefix = '';
	static protected $prefix = ''; // module prefix

	static protected $logger;
	static public $instances = array();

	const LNS = 'advertikon'; // Language name space

	static public function prefix( $v ) {
		return static::$prefix . $v;
	}

	static public function ajax_url( array $query = array() ) {
		return self::url( 'wp-admin/admin-ajax.php', $query );
	}

	static public function url( $page, $query = array() ) {
		return add_query_arg( $query, get_site_url( null, $page ) );
	}

	static public function post( $name, $default = null ) {
		if ( isset( $_POST[ $name ] ) ) {
			return $_POST[ $name ];
		}

		return $default;
	}

	static public function request( $name, $default = null ) {
		if ( isset( $_REQUEST[ $name ] ) ) {
			return $_REQUEST[ $name ];
		}

		return $default;
	}

	public function __construct() {
		self::$instances['default'] = $this;
		load_plugin_textdomain( self::LNS, false,  dirname( __FILE__ ) . '/languages' );
	}

	protected function init() {
		if ( !$this->FILE ) {
			throw new Exception( 'FILE needs to be initialized' );
		}

		$this->register_autoloader();
		register_activation_hook( $this->FILE, [ $this, 'on_activate', ] );

		if ( !self::$logger ) {
			self::$logger = new Advertikon_Library_Log();
		}

		Advertikon_Library_Renderer_Admin::init();
	}

	protected function register_autoloader() {
		spl_autoload_register( [ $this, 'autoload', ] );
	}

	protected function autoload( $name ) {
		if ( !$this->class_prefix ) {
			throw new Exception( 'Class prefix needs to be defined' );
		}

		if ( 0 === strpos( $name, $this->class_prefix ) ) {
			$classes_dir = realpath( plugin_dir_path( $this->FILE ) );
			$class_file = strtolower( str_replace( '_', DIRECTORY_SEPARATOR, substr( $name, strlen( $this->class_prefix ) ) ) . '.php' );

			if ( !is_file( $classes_dir . $class_file ) ) {
				return false;
			}

			require_once $classes_dir . $class_file;
		}

		if ( 0 === strpos( $name, 'Advertikon_Library' ) ) {
			$classes_dir = realpath( plugin_dir_path( $this->FILE ) );
			$class_file = strtolower( str_replace( '_', DIRECTORY_SEPARATOR, substr( $name, 10 ) ) . '.php' );

			if ( !is_file( $classes_dir . $class_file ) ) {
				return false;
			}

			require_once $classes_dir . $class_file;
		}
	}

	public function on_activate() {
		if( !is_plugin_active( 'woocommerce/woocommerce.php' ) ) {
			throw new Exception( sprintf(
				__( 'Plugin "%s" requires "WooCommerce" to be installed', $this->ln ),
				$this->name
			) );
		}
	}

	public static function log( $message, $severity = Advertikon_Library_Log::LEVEL_NORMAL ) {
		self::$logger->log( $message, '', $severity );
	}

	public static function error( $message ) {
		self::log( $message, Advertikon_Library_Log::LEVEL_ERROR );
	}
	
	public static function get_logger() {
		if ( !self::$logger ) {
			self::$logger = new Advertikon_Library_Log();
		}

		return self::$logger;
	}

	/**
	 * Returns free shipping objects for current car
	 *
	 * @return WC_Shipping_Free_Shipping[]
	 */
	public function get_free_shipping() {
		$ret = array();

		if( WC()->cart ) {
			foreach( WC()->cart->get_shipping_packages() as $package ) {
				$shipping_zone    =  WC_Shipping_Zones::get_zone_matching_package( $package );
				$shipping_methods = $shipping_zone->get_shipping_methods( true );

				foreach( $shipping_methods as $method ) {
					if ( 'free_shipping' === $method->id ) {
						$ret[] = $method;
					}
				}
			}
		}
		
		return $ret;
	}
}

if ( !function_exists( 'ADK' ) ) {
	/**
	 * Returns plugin main instance
	 * @param string $code Plaugin code
	 * @return Advertikon
	 */
	function ADK( $code = null ) {
		if ( is_null( $code ) || !isset( Advertikon::$instances[ $code ] ) ) {
			return Advertikon::$instances['default'];
		}

		return Advertikon::$instances[ $code ];
	}
}