<?php
/**
 * WC_innovext_allpay_aio class.
 */
if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

class WC_innovext_allpay_aio extends WC_Payment_Gateway {

	// define Allpay checkout url
	const ALLPAY_CHECKOUT_PRODUCTION = 'https://payment.allpay.com.tw/Cashier/AioCheckOut';
	const ALLPAY_CHECKOUT_TEST = 'https://payment-stage.allpay.com.tw/Cashier/AioCheckOut';

	// define Allpay inquery url
	const ALLPAY_INQUERY_PRODUCTION = 'https://payment.allpay.com.tw/Cashier/QueryTradeInfo/V3';
	const ALLPAY_INQUERY_TEST = 'https://payment-stage.allpay.com.tw/Cashier/QueryTradeInfo/V3';

	// define Allpay checkout url
	const ECPAY_CHECKOUT_PRODUCTION = 'https://payment.ecpay.com.tw/Cashier/AioCheckOut';
	const ECPAY_CHECKOUT_TEST = 'https://payment-stage.ecpay.com.tw/Cashier/AioCheckOut';

	// define Ecpay inquery url
	const ECPAY_INQUERY_PRODUCTION = 'https://payment.ecpay.com.tw/Cashier/QueryTradeInfo/V3';
	const ECPAY_INQUERY_TEST = 'https://payment-stage.ecpay.com.tw/Cashier/QueryTradeInfo/V3';

	/** @var bool Whether or not logging is enabled */
	public static $log_enabled = false;

	/** @var WC_Logger Logger instance */
	public static $log = false;

	/**
	 * Constructor for the gateway.
	 *
	 * @access public
	 * @return void
	 */
	public function __construct() {

		$this->id = 'innovext_allpay_aio';
		$this->has_fields = false;
		$this->method_title = '歐付寶/綠界全方位金流';

		$this->init_form_fields();
		$this->init_settings();

		// Define user set variables
		$this->title               = $this->get_option( 'title' );
		$this->pay_use             = $this->get_option( 'pay_use', '1' );
		$this->description         = $this->get_option( 'description' );
		$this->instruction_succ    = $this->get_option( 'instruction_succ' );
		$this->instruction_on_hold = $this->get_option( 'instruction_on_hold' );
		$this->expire_date         = $this->get_option( 'ExpireDate' );
		$this->exclude_payments    = $this->get_option( 'exclude_payments' );
		$this->order_prefix        = $this->get_option( 'order_prefix' );
		$this->min_amount          = $this->get_option( 'min_amount' );
		$this->reduce_stock        = $this->get_option( 'reduce_stock' );
		$this->english             = $this->get_option( 'english' );
		$this->query_trade_info    = $this->get_option( 'query_allpay_trade_info' );
		$this->payment_method_label = $this->get_option( 'payment_method_label' );
		$this->mer_id              = $this->get_option( 'MerchantID' );
		$this->hash_key            = $this->get_option( 'hash_key' );
		$this->hash_iv             = $this->get_option( 'hash_iv' );
		$this->testmode            = $this->get_option( 'testmode' );
		$this->admin_mode          = $this->get_option( 'admin_mode' );
		$this->debug               = $this->get_option( 'debug' );

		if( $this->pay_use !== '2' ) {
			$this->icon = apply_filters( 'inno_woocommerce_allpay_icon', plugins_url( '../icon/allpay-logo.png', __FILE__ ) );
		} else {
			$this->icon = apply_filters( 'inno_woocommerce_ecpay_icon', plugins_url( '../icon/ecpay-logo.png', __FILE__ ) );
		}

		$this->payment_type = 'aio';
		$this->notify_url = WC()->api_request_url( 'WC_innovext_allpay_aio' );

		$this->allpay_checkout_gateway = ( $this->testmode == 'yes' ) ? self::ALLPAY_CHECKOUT_TEST : self::ALLPAY_CHECKOUT_PRODUCTION;
		$this->ecpay_checkout_gateway = ( $this->testmode == 'yes' ) ? self::ECPAY_CHECKOUT_TEST : self::ECPAY_CHECKOUT_PRODUCTION;

		$this->allpay_inquery_url = ( $this->testmode == 'yes' ) ? self::ALLPAY_INQUERY_TEST : self::ALLPAY_INQUERY_PRODUCTION;
		$this->ecpay_inquery_url = ( $this->testmode == 'yes' ) ? self::ECPAY_INQUERY_TEST : self::ECPAY_INQUERY_PRODUCTION;

		self::$log_enabled = $this->debug;

		if( 'yes' == $this->testmode ) {
			$this->title .= '|測試';
		}

		if( 'yes' == $this->admin_mode ) {
			$this->title .= '|管理員';
		}

		// Actions
		add_action( 'woocommerce_update_options_payment_gateways_' . $this->id, array( $this, 'process_admin_options' ) );
		add_action( 'woocommerce_receipt_'. $this->id, array( $this, 'receipt_page' ) );
		add_action( 'woocommerce_api_wc_'. $this->id, array( $this, 'check_allpay_response' ) );
		add_action( 'valid_allpay_ipn_request', array( $this, 'successful_request' ) );
		add_action( 'woocommerce_admin_order_data_after_billing_address', array( $this, 'allpay_admin_order_data_after_billing_address' ) , 10, 1 );

		//add_action( 'woocommerce_thankyou_'. $this->id, array( $this, 'thankyou_page' ) );
		add_filter( 'woocommerce_thankyou_order_received_text', array( $this, 'thankyou_order_received_text' ), 10, 2 );

		// add query order metabox
		add_action( 'woocommerce_admin_order_data_after_billing_address', array( $this, 'add_query_trade_info_meta_box' ) , 10, 1 );

		// Customer Emails
		add_action('woocommerce_email_before_order_table', array($this, 'email_instructions'), 10, 2 );
	}

	
	/**
	 * Logging method.
	 * @param string $message
	 * @param array $array
	 */
	public static function log( $message, $array = '' ) {
		if ( self::$log_enabled ) {
			if ( empty( self::$log ) ) {
				self::$log = new WC_Logger();
			}
			if( $array && is_array( $array ) ) {
				ob_start();
				print_r( $array );
				$stringify_array = ob_get_clean();
				$message .= PHP_EOL . $stringify_array;
			}
			self::$log->add( 'allpay_aio', $message );
		}
	}

	/**
	 * Initialise Gateway Settings Form Fields
	 *
	 * @access public
	 * @return void
	 */
	function init_form_fields() {
		$this->form_fields = require( 'allpay-ecpay-settings.php' );
	}

	/**
	 * Admin Panel Options
	 * - Options for bits like 'title' and availability on a country-by-country basis
	 *
	 * @access public
	 * @return void
	 */
	public function admin_options() {

		echo '<h3>歐付寶/綠界全方位金流</h3>';
		$this->display_allpay_admin_notice();

		echo '<table class="form-table">';
		// Generate the HTML For the settings form.
		$this->generate_settings_html();
		echo '</table>';

	}

	/**
	 * Display admin notice if option is set to admin mode or test mode
	 *
	 * @access public
	 * @return void
	 */        
	function display_allpay_admin_notice() {

		if( $this->testmode == 'yes' ) {
			echo '<div class="error">';
			echo '<p>現正開啟測試模式</p>';
			echo '</div>';
		}

		if( $this->admin_mode == 'yes' ) {
			echo '<div class="error">';
			echo '<p>現正開啟管理員模式</p>';
			echo '</div>';
		}
	}

	/**
	 * Get allpay Args for passing to allpay
	 *
	 * @access public
	 * @param mixed $order
	 * @return array
	 */
	function get_allpay_args($order) {

		if( $this->order_prefix ) {
			$order_id = $this->order_prefix . $order->id;
		} else {
			$order_id = $order->id;
		}

		$this->log( 'Generating payment form for order #' . $order_id . '. Notify URL: ' . $this->notify_url );

		$total_amount = round( $order->get_total() );

		// Get order items
		if ( sizeof( $order->get_items() ) > 0 ) {

			$item_names = '';

			foreach ( $order->get_items() as $item ) {
				if ( $item['qty'] ) {

					/**
					 * because the product line will be splitted by # after submmited to allpay,
					 * so we have to replace the hash '#' to muilti byte one if the product title
					 * contains #. And also convert special characters to prevent any error.
					 */
					$item_name = self::convert_special_char_to_multibyte( $item['name'] );
					$item_names .= $item_name . ' x ' . $item['qty'].'#';
				}
			}
			$item_names = rtrim( $item_names, '#' );
		}

		// get excluded payment methods
		$ignore_payment = '';
		if ( $this->exclude_payments ) {
			foreach( $this->exclude_payments as $exclude_payment ) {
				$ignore_payment .= $exclude_payment . '#';
			}
			$ignore_payment = rtrim( $ignore_payment, '#' );
		}

		$expire_date = $this->expire_date;

		$this->log( 'Item Name : ' . $item_names );

		$mer_id = $this->mer_id;
		$payment_type = $this->payment_type;
		$return_url = $this->get_return_url($order);
		$notify_url = $this->notify_url;
		$english    = $this->english;

		$allpay_args = array(
			'MerchantID'        => $mer_id,
			'MerchantTradeNo'   => $order_id,
			'MerchantTradeDate' => current_time('Y/m/d H:i:s'),
			'PaymentType'       => $payment_type,
			'TotalAmount'       => $total_amount,
			'TradeDesc'         => get_bloginfo('name'),
			'ItemName'          => $item_names,
			'ChoosePayment'     => 'ALL',
			'ReturnURL'         => $notify_url, // reply url
			'PaymentInfoURL'    => $notify_url, // CVS, Barcode reply url
			'ClientBackURL'     => $return_url, 
			'OrderResultURL'    => $return_url, // return to store
		);

		// set ignore payment
		if( $ignore_payment && $english == 'no' ) {
			$allpay_args['IgnorePayment'] = $ignore_payment;
		}

		// turn on english mode, will only diplay credit card payment
		if( $english == 'yes' ) {
			$allpay_args['Language'] = 'ENG';
			$allpay_args['ChoosePayment'] = 'Credit';
		}

		// set expire date
		if( $expire_date > 0 && $expire_date <= 60 ) {
			$allpay_args['ExpireDate'] = $this->expire_date;
		}

		$allpay_args = apply_filters( 'innovext_allpay_aio_args', $allpay_args );

		return $allpay_args;
	}

	/**
	 * Convert special character to multibyte
	 *
	 * @param  $string the string contains any character include special character
	 * @return string
	 */
	static function convert_special_char_to_multibyte( $string ) {

		$char    = array( '~', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '-', '=', '+' );
		$mb_char = array( '～', '！', '＠', '＃', '＄', '％', '︿', '＆', '＊', '（', '）', '—', '＝', '＋' );

		return str_replace( $char, $mb_char, $string );
	}

	/**
	 * Output for the order received page.
	 *
	 * @access public
	 * @param mixed $order_id
	 * @return void
	 */
	function thankyou_page( $order_id ) {

		$return_code = get_post_meta( $order_id, '_RtnCode', true );

		if( $return_code ) {
			if( $return_code === '1' ) {
				if( $this->instruction_succ ) {
					echo wpautop( wptexturize( $this->instruction_succ ) );
				}
			} elseif( ( $return_code === '2' || $return_code === '10100073' ) ) {
				if( $this->instruction_on_hold ) {
					echo wpautop( wptexturize( $this->instruction_on_hold ) );
				}
			} else {
				echo '<p style="padding: 5px 15px;background-color: #FFD0D0;border: 1px solid #E30000;">錯誤代碼 : '.$return_code.'</p>';                    
			}
		} else {
			echo '<p style="padding: 5px 15px;background-color: #FFD0D0;border: 1px solid #E30000;">發生錯誤，無法取得訂單狀態，若您已付款，請通知商店管理員。</p>';
		}
	}

	/**
	 * Thank you order received text
	 * 
	 * @param  string $message the original message
	 * @param  object $order   WC Order
	 * @return mixed
	 */
	function thankyou_order_received_text( $text, $order ) {

		$order_id = $order->id;

		$return_code = get_post_meta( $order_id, '_RtnCode', true );

		if ( $order->payment_method != 'innovext_allpay_aio' ) {
			return $text;
		}

		if( $return_code ) {
			if( $return_code === '1' && $this->instruction_succ ) {
				return wpautop( wptexturize( $this->instruction_succ ) );
			} elseif( ( $return_code === '2' || $return_code === '10100073' ) ) {
				if( $this->instruction_on_hold ) {
					return wpautop( wptexturize( $this->instruction_on_hold ) );
				}
			} else {
				return '<p style="padding: 5px 15px;background-color: #FFD0D0;border: 1px solid #E30000;">錯誤代碼 : '.$return_code.'</p>';
			}
		} else {
			return '<p style="padding: 5px 15px;background-color: #FFD0D0;border: 1px solid #E30000;">發生錯誤，無法取得訂單狀態，若您已付款，請通知商店管理員。</p>';
		}

		return $text;
	}

	/**
	 * Get the check mac value.
	 *
	 * @param array $args
	 * @return string
	 */        
	function get_the_check_mac_value( $args ){

		$hash_key = $this->hash_key;
		$hash_iv = $this->hash_iv;
		$check_mac_value = self::get_check_mac_value( $args, $hash_key, $hash_iv );

		return $check_mac_value;
	}

	/**
	 * Get check mac value. Check mac value is the validation mechanism of Allpay/ECpay
	 * to check the post value from/to Allpay/ECpay to prevent the value been falsified.
	 *
	 * @param array $args
	 * @param string $hash_key
	 * @param string $hash_iv
	 * @param string $hash_algo hash algorithm, md5|sha256...etc
	 * @return string || boolean
	 */		
	static function get_check_mac_value( $args, $hash_key, $hash_iv, $hash_algo = 'md5' ){

		if( empty( $args ) || empty( $hash_key ) || empty( $hash_iv ) ) {
			return false;
		}

		ksort( $args, SORT_STRING | SORT_FLAG_CASE );
		$args_hash_key = array_merge( array( 'HashKey'=> $hash_key ), $args, array( 'HashIV' => $hash_iv ) );

		$args_string = '';
		foreach( $args_hash_key as $v => $k ){
			$args_string .= $v .'='. $k .'&';
		}

		$args_string     = rtrim( $args_string, "&" );
		$args_urlencode  = urlencode( $args_string );
		$args_urlencode  = self::inno_special_character_decode( $args_urlencode );
		$args_to_lower   = strtolower( $args_urlencode );
		$check_mac_value = strtoupper( hash( $hash_algo, $args_to_lower ) );

		return $check_mac_value;
	}

	/**
	 * Special character decode, Allpay/ECpay uses .Net to encode the url, but some
	 * of the speicial characters are not encoded. To make sure the check mac value
	 * is correct, we need to transform them back.
	 * 
	 * @param type $string
	 * @return string
	 */
	static function inno_special_character_decode( $string ) {
		$char	 = array( '%28', '%29', '%5b', '%5d' );
		$mb_char = array( '(', ')', '[', ']' );

		return str_replace( $char, $mb_char, $string );
	}

	/**
	 * Generate the allpay button link (POST method)
	 *
	 * @access public
	 * @param string $order_id
	 * @return string
	 */
	function generate_allpay_form( $order_id ) {

		global $woocommerce;

		$order = new WC_Order( $order_id );

		$allpay_args = $this->get_allpay_args( $order );
		$check_mac_value = $this->get_the_check_mac_value( $allpay_args );
		$allpay_args['CheckMacValue'] = $check_mac_value;

		$this->log( 'POST to Allpay Args : ', $allpay_args );

		// save pay use type - 1:Allpay, 2:Ecpay
		$pay_use = $this->pay_use;
		update_post_meta( $order_id, '_PayUse', $pay_use );

		if( $pay_use !== '2' ) {
			$gateway_url = $this->allpay_checkout_gateway;
		} else {
			$gateway_url = $this->ecpay_checkout_gateway;
		}

		wc_enqueue_js( '
			$.blockUI({
					message: "感謝您的訂購，接下來畫面將導向付款頁面",
					baseZ: 99999,
					overlayCSS:
					{
						background: "#fff",
						opacity: 0.6
					},
					css: {
						padding:        "20px",
						zindex:         "9999999",
						textAlign:      "center",
						color:          "#555",
						border:         "3px solid #aaa",
						backgroundColor:"#fff",
						cursor:         "wait",
						lineHeight:     "24px",
					}
				});
			jQuery("#allpay_payment_form").submit();
		' );

		$output = '<form method="POST" id="allpay_payment_form" action="'.$gateway_url.'">';
		foreach( $allpay_args as $k => $v ){
			$output .= '<input type="hidden" name="'.$k.'" value="'.$v.'" >';
		}
		$output .= '</form>';

		return $output;
	}

	/**
	 * Output for the order received page.
	 *
	 * @access public
	 * @return void
	 */
	function receipt_page( $order_id ) {

		global $woocommerce;

		echo '<p>感謝您的訂購，接下來將導向付款頁面，請稍後</p>';

		// Clear cart
		$woocommerce->cart->empty_cart();

		$order = new WC_Order( $order_id );

		echo $this->generate_allpay_form( $order_id );
	}

	/**
	 * Add content to the WC emails.
	 *
	 * @access public
	 * @param WC_Order $order
	 * @param bool $sent_to_admin
	 * @return void
	 */
	function email_instructions( $order, $sent_to_admin ) {

		if ( $order->payment_method !== $this->id ) {
			return;
		}

		$order_id = $order->id;
		$payment_type = get_post_meta( $order_id, '_PaymentType', true );

		if( $payment_type ) {
			$payment_type_label = self::parse_payment_type( $payment_type );
		}

		if ( $order->status == 'processing' ) {

			if( $sent_to_admin ) {
				echo "已收到付款，付款方式 - ".$payment_type_label;
			}else{
				echo wpautop( wptexturize( $this->instruction_succ ) ). PHP_EOL;
			}

		} elseif( $order->status == 'on-hold' ) {

			if( $sent_to_admin ) {
				echo "尚未付款，付款方式 - ".$payment_type_label;
			} else {
				echo wpautop( wptexturize( $this->instruction_on_hold ) ). PHP_EOL;
				// vaccount detail, cvs detail
				$this->print_order_meta( $order );
			}
		}
	}

	/**
	 * Print order meta for webatm, atm, cvs in email notification
	 *
	 * @access public
	 * @return void
	 */        
	function print_order_meta( $order ) {

		if( $this->email_return_code ) {
			$email_return_code = $this->email_return_code;
		} else {
			$email_return_code = '';
		}

		if( '2' == $email_return_code ) { ?>
			<h2>付款資訊</h2>
			<table class="shop_table order_details allpay_details">
				<tbody>
					<tr><th>付款方式</th><td><?php echo $this->email_payment_type_label ?></td></tr>
					<tr><th>銀行代碼</th><td><?php echo $this->email_bank_code ?></td></tr>
					<tr><th>繳費帳號</th><td><?php echo $this->email_vaccount ?></td></tr>
					<tr><th>繳費期限</th><td><?php echo $this->email_expire_date ?></td></tr>
				</tbody>
			</table>
	<?php } elseif( '10100073' == $email_return_code && 'CVS' == $this->email_payment_method ) { ?>
			<h2>付款資訊</h2>
			<table class="shop_table order_details allpay_details">
				<tbody>
					<tr><th>付款方式</th><td><?php echo $this->email_payment_type_label ?></td></tr>
					<tr><th>繳費代碼</th><td><?php echo $this->email_payment_no ?></td></tr>
					<tr><th>繳費期限</th><td><?php echo $this->email_expire_date ?></td></tr>
				</tbody>
			</table>
	 <?php }
	}

	/**
	 * Check allpay response
	 *
	 * @access public
	 * @return void
	 */
	function check_allpay_response() {

		@ob_clean();
		$ipn_response = ! empty( $_POST ) ? $_POST : false;
		$is_valid_request = @$this->check_ipn_response_is_valid( $ipn_response );

		if ( $is_valid_request  ) {
			header( 'HTTP/1.1 200 OK' );
			do_action( "valid_allpay_ipn_request", $ipn_response );
		} else {
			die( "0|ErrorMessage" );
		}
	}

	/**
	 * Receive ipn response from allpay, update order status if succeeded.
	 *
	 * @param string $ipn_response , encrypted string
	 * @return void
	 */
	function successful_request( $ipn_response ) {

		$MerchantTradeNo = $ipn_response['MerchantTradeNo'];
		$order_id = $this->parse_merchant_trade_no( $MerchantTradeNo );

		// save the woocommerce transacetion id, same as MerchantTradeNo
		update_post_meta( $order_id, '_transaction_id', $MerchantTradeNo );
		update_post_meta( $order_id, '_MerchantTradeNo', $MerchantTradeNo );

		$order = new WC_Order( $order_id );

		$return_code = $ipn_response['RtnCode'];

		//$old_return_code = get_post_meta( $order_id, '_RtnCode', true ); // if previous is 2 or 10100073

		$payment_type = $ipn_response['PaymentType'];
		$payment_method = explode( '_', $ipn_response['PaymentType'] );

		if( $payment_type ) {
			update_post_meta( $order_id, '_PaymentType', $payment_type );
		}

		if( $return_code ) {
			update_post_meta( $order_id, '_RtnCode', $return_code );
		}

		$this->log( 'successful-request : ', $ipn_response  );

		// parse allpay ipn payment type label
		$payment_type_label = self::parse_payment_type( $payment_type );

		$payment_method_title = get_post_meta( $order_id, '_payment_method_title', true );

		// change payment method label
		if( $this->payment_method_label == 'main_label' ) {
			$change_payment_type_label = self::parse_payment_type( $payment_type, true );
		} else if( $this->payment_method_label == 'detailed_label' ) {
			$change_payment_type_label = self::parse_payment_type( $payment_type );
		} else {
			$change_payment_type_label = $this->title; // default method title
		}

		if( $this->payment_method_label != 'default' && $payment_method_title != $change_payment_type_label ) {
			if ( 'yes' == $this->testmode ) {
				$change_payment_type_label .= '|測試';
			}
			if ( 'yes' == $this->admin_mode ) {
				$change_payment_type_label .= '|管理員';
			}
			update_post_meta( $order_id, '_payment_method_title', $change_payment_type_label );
		}

		do_action( 'innovext_allpay_before_process_rtn_code', $ipn_response, $order_id );

		$pay_use = get_post_meta( $order_id, '_PayUse', true );

//		if( empty( $pay_use ) ) {
			// get the payment gateway type, 1:Allpay 2:ECpay
		$query_trade_info_args = $this->get_query_trade_info_args( $order_id );
		$this->log( 'Get query trade info args :', $query_trade_info_args );
//		}

		if( isset( $query_trade_info_args['PayUse'] ) && $query_trade_info_args['PayUse'] ) {
			$pay_use = $query_trade_info_args['PayUse'];
			update_post_meta( $order_id, '_PayUse', $pay_use );
		}

		// return code === 1 means the payment has been completed
		if( $return_code  === '1' ) {

			$order->payment_complete();
			$order->add_order_note( '已收到顧客付款，付款方式 "'.$payment_type_label.'"' );

			die("1|OK");
		} elseif( $return_code === '2' || $return_code === '10100073' ) {

			/**
			 * return code '2' means the customer choosed the ATM, '10100073'
			 * means convenient store. the orders will be waiting for the payment.
			 * If the customer completed the payment, the allpay system will
			 * send the post value containing return code '1' to notify the WC API.
			 */

			// save the ExpireDate to let admin know when will the order be expired
			update_post_meta( $order_id, '_ExpireDate', $ipn_response['ExpireDate'] );

			if( $return_code === '2' ) {
				$this->email_return_code = '2';
				$this->email_payment_type_label = $payment_type_label;
				$this->email_bank_code = $ipn_response['BankCode'];
				$this->email_vaccount = $ipn_response['vAccount'];
				$this->email_expire_date = $ipn_response['ExpireDate'];
			} else if( $return_code === '10100073' && $payment_method[0] === 'CVS' ) {
				$this->email_return_code = '10100073';
				$this->email_payment_method = $payment_method[0];
				$this->email_payment_type_label = $payment_type_label;
				$this->email_payment_no = $ipn_response['PaymentNo'];
				$this->email_expire_date = $ipn_response['ExpireDate'];
			} else if( $return_code === '10100073' && $payment_method[0] === 'APPBARCODE' ) {
				$this->email_return_code = '10100073';
				$this->email_payment_method = $payment_method[0];
				$this->email_payment_type_label = $payment_type_label;
				$this->email_expire_date = $ipn_response['ExpireDate'];
			}

			$order->update_status('on-hold', '已選擇付款方式 "' .$payment_type_label. '" ，等待顧客付款。' );

			die("1|OK");

		} else {
			$return_message = $ipn_response['RtnMsg'];
			$return_code_msg = $return_code . ' - ' . $return_message;
			$return_code_msg = apply_filters( 'innovext_allpay_cancel_order_message', $return_code_msg, $ipn_response );
			$this->log( 'error, return code: '. $return_code );
			$order->update_status( 'cancelled', '取消訂單，錯誤代碼 : ' . $return_code_msg );
			die("0|ErrorMessage");
		}

	}

	/**
	 * Parse Allpay merchant trade number to WooCommerce order id
	 * 
	 * @param string $mer_trade_no
	 * @return string
	 */
	function parse_merchant_trade_no( $mer_trade_no ) {
		
		// check if order_prefix exists
		$order_prefix = $this->order_prefix;
		$length = strlen($order_prefix);

		if( !empty( $order_prefix ) && substr($mer_trade_no, 0, $length) === $order_prefix ) {
			$order_id_arr = explode( $order_prefix, $mer_trade_no );
			$order_id = $order_id_arr[1];
		} else {
			$order_id = intval( $mer_trade_no );
		}
		return $order_id;
	}

	/**
	 * Compare the returned allpay CheckMacValue with local CheckMacValue
	 *
	 * @param array $ipn_response
	 * @return bool
	 */
	function check_ipn_response_is_valid( $ipn_response ) {
		$ipn_check_mac_value = $ipn_response['CheckMacValue'];

		unset( $ipn_response['CheckMacValue'] );

		$my_check_mac_value = $this->get_the_check_mac_value( $ipn_response );

		$this->log( 'ipn check mac:'.$ipn_check_mac_value.' my_check_mac_value:'.$my_check_mac_value );

		if( $ipn_check_mac_value == $my_check_mac_value ) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Display allpay info in admin order detail
	 *
	 * @param object $order
	 * @return void
	 */
	function allpay_admin_order_data_after_billing_address( $order ) {

		if ( $order->payment_method != 'innovext_allpay_aio' || $order->status == 'cancelled' ) {
			return;
		}

		$order_id           = $order->id;
		$pay_use            = get_post_meta( $order_id, '_PayUse', true );
		$payment_type_label = self::parse_payment_type( $payment_type );
		$return_code        = get_post_meta( $order_id, '_RtnCode', true );
		$merchant_trade_no  = get_post_meta( $order_id, '_MerchantTradeNo', true );
		$expire_date        = get_post_meta( $order_id, '_ExpireDate', true );

		echo '<h4>金流資訊</h4>';
		echo '<table class="allpay-aio-info">';

		if( $pay_use ) {
			$pay_use_label = '歐付寶';
			if( $pay_use == '2' ) {
				$pay_use_label = '綠界';
			}
			echo '<tr><th>金流</th><td>'. $pay_use_label . '</td></tr>';
		}

		if( $merchant_trade_no ) {
			echo '<tr><th>訂單編號</th><td>'. $merchant_trade_no . '</td></tr>';
		}

		if( $payment_type ) {
			echo '<tr><th>付款方式</th><td>'. $payment_type_label . '</td></tr>';
		}

		if( $return_code ) {
			echo '<tr><th>付款狀態</th><td>';
			if( $return_code === '1' ) {
				echo '已付款';
			}elseif( $return_code === '2' || $return_code === '10100073' ){
				echo '尚未付款';
			}
			echo '</td></tr>';
		}

		if( $expire_date ){
			echo '<tr><th>繳費期限</th><td>'. $expire_date . '</td></tr>';
		}

		echo '</table>';
	}

	/**
	 * Add meta box for allpay query info
	 *
	 * @param object $order
	 * @return void
	 */
	function add_query_trade_info_meta_box( $order ) {

		if ( $order->payment_method != 'innovext_allpay_aio' ) {
			return;
		}

		if( $this->query_trade_info != 'yes' ){
			return;
		}

		add_meta_box(
			'allpay-queried-order-info',
			'訂單資訊',
			array( &$this, 'display_query_trade_info' ),
			'shop_order',
			'advanced',
			'high',
			$order
		);
	}

	/**
	 * Display allpay trade info callback
	 *
	 * @param object $order
	 * @return void
	 */
	function display_query_trade_info( $order ){

		$order_id = $order->ID;

		$queried_args = $this->get_query_trade_info_args( $order_id );

		if( ! $queried_args ) {
			echo '無交易資訊';
			return;
		}

		// ignore check mac value which is unnecessary to display
		if( isset( $queried_args['CheckMacValue'] ) ){
			unset( $queried_args['CheckMacValue'] );
		}

		// parse the payment type to Chinese
		if( isset( $queried_args['PaymentType'] ) ){
			$payment_type = $queried_args['PaymentType'];
			$queried_args['PaymentType'] = self::parse_payment_type( $payment_type );
		}

		echo '<table>';
		foreach( $queried_args as $k => $v ){
			$label = self::parse_query_trade_info_args_label( $k );
			echo '<tr><th>'.$label.'</th><td>'.$v.'</td></tr>';
		}
		echo '<tr><th>備註</th><td>交易狀態代碼請由歐付寶/綠界廠商後台查尋。</td></tr>';
		echo '</table>';
	}

	/**
	 * Get allpay query trade info args label, translate english args label to chinese
	 * @param string $label
	 * @return mixed
	 */
	static function parse_query_trade_info_args_label( $label ) {

		$args = array(
			'HandlingCharge' => '手續費合計',
			'ItemName' => '商品名稱',
			'MerchantID' => '商店代號',
			'MerchantTradeNo' => '訂單編號',
			'PaymentDate' => '交易日期',
			'PaymentType' => '付款方式',
			'PaymentTypeChargeFee' => '通路費',
			'TradeAmt' => '交易金額',
			'TradeDate' => '訂單成立時間',
			'TradeNo' => '交易編號',
			'TradeStatus' => '交易狀態',
			'CheckMacValue' => '檢查碼',
			);

		if( $label ) {
			if( isset( $args[$label] ) ) {
				return $args[$label];
			} else {
				return $label;
			}
		} else {
			return $args;
		}

	}

	/**
	 * Get allpay query trade info wrapper
	 *
	 * @param string $order_id
	 * @return mixed
	 */
	function get_query_trade_info_args( $order_id ) {

		$mer_id = $this->mer_id;
		$mer_trade_no = get_post_meta( $order_id, '_MerchantTradeNo', true );

		if( empty( $mer_trade_no ) ) {
			return false;
		}

		$time_stamp = time();

		$args = array(
			'MerchantID' => $mer_id,
			'MerchantTradeNo' => $mer_trade_no,
			'TimeStamp' => $time_stamp
		);

		$check_mac_value = $this->get_the_check_mac_value( $args );
		$args = array_merge( $args, array( 'CheckMacValue' => $check_mac_value ) );

		$pay_use = get_post_meta( $order_id, '_PayUse', true );

		if( $pay_use === '2' ) {
			$form_action = $this->ecpay_inquery_url;
		} else {
			$form_action = $this->allpay_inquery_url;
		}

		$result = self::post_get_data( $args, $form_action );
		$result_args = wp_parse_args( $result );

		return $result_args;
	}

	/**
	 * Get POST data
	 * 
	 * @param type $args
	 * @param type $form_action
	 * @return boolean
	 */
	static function post_get_data( $args, $form_action ) {

		$ch = curl_init();
		$post_data = http_build_query( $args );
		curl_setopt( $ch, CURLOPT_URL, $form_action );
		curl_setopt( $ch, CURLOPT_RETURNTRANSFER, TRUE );
		curl_setopt( $ch, CURLOPT_POST, TRUE );
		curl_setopt( $ch, CURLOPT_POSTFIELDS, $post_data );
		$output = curl_exec( $ch );
		curl_close( $ch );

		if( empty( $output ) ) {
			return false;
		}

		return $output;
	}

	/**
	 * Get Allpay or Ecpay label
	 * 
	 * @param string $order_id
	 */
	static function get_allpay_ecpay_label( $order_id ) {
		$pay_use = get_post_meta( $order_id, '_PayUse', true );
		if( $pay_use === '2' ) {
			$label = '綠界';
		} else {
			$label = '歐付寶';
		}
		return $label;
	}
	/**
	 * Get main payment type args
	 * 
	 * @param string $method
	 * @return string||array
	 */
	static function get_main_payment_type_args( $method = '' ) {

		$methods = array(
			'Credit'    => '信用卡',
			'WebATM'    => '網路ATM',
			'ATM'       => 'ATM自動櫃員機',
			'CVS'       => '超商代碼',
			'BARCODE'   => '超商條碼',
			'Alipay'    => '支付寶',
			'Tenpay'    => '財付通',
			'TopUpUsed' => '儲值消費',
			'APPBARCODE' => '全家條碼立即儲',
			);

		if( $method ) {
			if( array_key_exists( $method, $methods ) ) {
				return $methods[$method];
			} else {
				return $method;
			}                
		} else {
			return $methods;
		}
	}

	/**
	 * Get payment type args
	 *
	 * @param string $method choose method
	 * @return array
	 */
	static function get_payment_type_args( $method = '' ) {

		$payment_type_args = require( 'payment-type-args.php' );

		if( $method ) {
			if( array_key_exists( $method, $payment_type_args ) ) {
				return $payment_type_args[$method];
			} else {
				return $method;
			}                
		} else {
			return $payment_type_args;
		}
	}

	/**
	 * Parse allpay payment type string to chinese eg: WebATM_TAISHIN to 台新WebATM
	 * If specified $main_payment_type, will return the main payment type args
	 *
	 * @param  string $payment_type Payment type
	 * @param  bool   $main_payment_type Main payment type 
	 * @return string
	 */
	static function parse_payment_type( $payment_type, $main_payment_type = false ) {

		$payment_type_arr = explode( '_', $payment_type, 2 );

		if( !isset( $payment_type_arr[0] ) || !isset( $payment_type_arr[1] ) ) {
			return $payment_type;
		} 

		$method = $payment_type_arr[0];
		$agent = $payment_type_arr[1];

		if( $main_payment_type ) {
			return self::get_main_payment_type_args( $method );
		}

		$payment_type_args = apply_filters( 'inno_allpay_get_payment_type_args', self::get_payment_type_args() );

		if( isset( $payment_type_args[$method][$agent] ) ) {
			return $payment_type_args[$method][$agent];
		}

		return $payment_type;
	}

	/**
	 * Process the payment and redirect to pay page
	 *
	 * @access public
	 * @param int $order_id
	 * @return array
	 */
	function process_payment( $order_id ) {

		$order = new WC_Order( $order_id );

		if( $this->reduce_stock == 'default' ) {
			// Reduce stock levels
			$order->reduce_order_stock();
		}

		return array(
			'result' => 'success',
			'redirect' => $order->get_checkout_payment_url( true )
		);
	}

	/**
	 * Payment form on checkout page
	 *
	 * @access public
	 * @return void
	 */
	function payment_fields() {

		if ( $this->description ){
			echo wpautop( wptexturize( $this->description ) );
		}
	}

	/**
	 * Is available. Put some condition here to turn on or off the availability on checkout.
	 *
	 * @access public
	 * @return bool
	 */
	function is_available() {

		global $woocommerce;

		// admin mode
		if( $this->admin_mode == 'yes' && !current_user_can( 'manage_woocommerce' ) ) {
			return false;
		}

		$subtotal = $woocommerce->cart->subtotal ;
		$min_amount = $this->min_amount;

		$shop_page_url = get_permalink( wc_get_page_id( 'shop' ) );
		$return_to  = apply_filters( 'woocommerce_continue_shopping_redirect', $shop_page_url );

		// amount condition
		if ( $min_amount > 0 && $min_amount > $subtotal ) {
			wc_print_notice( sprintf( '購物滿 %s 元，即可使用 %s 付款！<a class="button" href="%s">繼續購物&raquo;</a>', $min_amount, $this->title, $return_to ), 'notice' );
			return false;
		}

		return parent::is_available();
	}
}