<?php
if (!defined('ABSPATH'))
    exit; // Exit if accessed directly

/**
 * Alipay Payment Gateway
 *
 * Provides an Alipay Payment Gateway.
 *
 * @class 		WC_Alipay
 * @extends		WC_Payment_Gateway
 * @version		1.0
 */

class WC_Alipay extends WC_Payment_Gateway {

    var $current_currency;
    var $multi_currency_enabled;

    /**
     * Constructor for the gateway.
     *
     * @access public
     * @return void
     */
    public function __construct() {
        global $woocommerce;

        $this->current_currency = $this->current_currency();
        $this->multi_currency_enabled = in_array('woocommerce-multilingual/wpml-woocommerce.php', apply_filters('active_plugins', get_option('active_plugins')))
                && get_option('icl_enable_multi_currency') == 'yes';
        $this->id = 'alipay';
        $this->icon = apply_filters('woocommerce_alipay_icon', plugins_url('images/alipay.png', __FILE__));
        $this->has_fields = false;

        // Load the form fields.
        $this->init_form_fields();

        // Load the settings.
        $this->init_settings();
        // Define user set variables
        $this->title = $this->settings['title'];
        $this->description = $this->settings['description'];
        $this->alipay_account = $this->settings['alipay_account'];
        $this->partnerID = $this->settings['partnerID'];
        $this->secure_key = $this->settings['secure_key'];
        $this->payment_method = $this->settings['payment_method'];
        $this->debug = $this->settings['debug'];
        $this->form_submission_method = $this->settings['form_submission_method'] == 'yes' ? true : false;
        $this->exchange_rate = $this->settings['exchange_rate'];

        $this->secure_key = $this->settings['secure_key'];

        $this->notify_url = str_replace('https:', 'http:', add_query_arg('wc-api', 'WC_Alipay', home_url('/'))); //trailingslashit(home_url()); 
        //Log
        if ($this->debug == 'yes')
            $this->log = $woocommerce->logger();

        // Actions
        add_action('admin_notices', array($this, 'requirement_checks'));
        add_action('woocommerce_api_wc_alipay', array($this, 'check_alipay_response'));
        add_action('woocommerce_update_options_payment_gateways', array($this, 'process_admin_options')); // WC <= 1.6.6
        add_action('woocommerce_update_options_payment_gateways_' . $this->id, array($this, 'process_admin_options')); // WC >= 2.0
        add_action('woocommerce_thankyou_alipay', array($this, 'thankyou_page'));
        add_action('woocommerce_receipt_alipay', array($this, 'receipt_page'));
    }

    /**
     * Initialise Gateway Settings Form Fields
     *
     * @access public
     * @return void
     */
    function init_form_fields() {
        global $woocommerce;

        $this->form_fields = array(
            'enabled' => array(
                'title' => __('Enable/Disable', 'alipay'),
                'type' => 'checkbox',
                'label' => __('Enable Alipay Payment', 'alipay'),
                'default' => 'no'
            ),
            'title' => array(
                'title' => __('Title', 'alipay'),
                'type' => 'text',
                'description' => __('This controls the title which the user sees during checkout.', 'alipay'),
                'default' => __('Alipay', 'alipay')
            ),
            'description' => array(
                'title' => __('Description', 'alipay'),
                'type' => 'textarea',
                'default' => __('Pay via Alipay, if you don\'t have an Alipay account, you can also pay with your debit card or credit card', 'alipay')
            ),
            'payment_method' => array(
                'title' => __('Alipay Payment Gateway Type', 'alipay'),
                'type' => 'select',
                'description' => __('Choose a payment method', 'alipay'),
                'options' => array(
                    'escrow' => __('Escrow Payment', 'alipay'),
                    'dualfun' => __('Dual(Direct Payment + Escrow payment)', 'alipay'),
                    'direct' => __('Direct Payment', 'alipay')
                )
            ),
            'partnerID' => array(
                'title' => __('Partner ID', 'alipay'),
                'type' => 'text',
                'description' => __('Please enter the partner ID<br />If you don\'t have one, <a href="https://b.alipay.com/newIndex.htm" target="_blank">click here</a> to get.', 'alipay'),
                'css' => 'width:400px'
            ),
            'secure_key' => array(
                'title' => __('Security Key', 'alipay'),
                'type' => 'text',
                'description' => __('Please enter the security key<br />If you don\'t have one, <a href="https://b.alipay.com/newIndex.htm" target="_blank">click here</a> to get.', 'alipay'),
                'css' => 'width:400px'
            ),
            'alipay_account' => array(
                'title' => __('Alipay Account', 'alipay'),
                'type' => 'text',
                'description' => __('Please enter your Alipay Email; this is needed in order to take payment.', 'alipay'),
                'css' => 'width:200px'
            ),
            'form_submission_method' => array(
                'title' => __('Submission method', 'alipay'),
                'type' => 'checkbox',
                'label' => __('Use form submission method.', 'alipay'),
                'description' => __('Enable this to post order data to Alipay via a form instead of using a redirect/querystring.', 'alipay'),
                'default' => 'no'
            ),
            'debug' => array(
                'title' => __('Debug Log', 'alipay'),
                'type' => 'checkbox',
                'label' => __('Enable logging', 'alipay'),
                'default' => 'no',
                'description' => __('Log Alipay events, such as trade status, inside <code>woocommerce/logs/alipay.txt</code>', 'alipay'),
            )
        );
        if ($this->current_currency != 'RMB') {
            $this->form_fields['exchange_rate'] = array(
                'title' => __('Exchange Rate', 'alipay'),
                'type' => 'text',
                'description' => __("Please set the $this->current_currency against RMB exchange rate ", 'alipay'),
                'css' => 'width:100px;'
            );
        }
    }

    /**
     * Check if requirements are met and display notices
     *
     * @access public
     * @return void
     */
    function requirement_checks() {
        if ($this->current_currency != 'RMB' && !$this->exchange_rate) {
            echo '<div class="error"><p>' . sprintf(__('Alipay is enabled, but the store currency is not set to RMB. Please <a href="%s">set the ' . $this->current_currency . ' against the RMB exchange rate</a>.', 'alipay'), admin_url('admin.php?page=woocommerce_settings&tab=payment_gateways&section=WC_Alipay#woocommerce_alipay_exchange_rate')) . '</p></div>';
        }
    }

    /**
     * Check if gateway is available
     *
     * @access public
     * @return bool
     */
    function is_available() {
        if ($this->enabled == 'no')
            return false;
        If ($this->multi_currency_enabled) {
            if ('RMB' != get_woocommerce_currency() && !$this->exchange_rate) {
                return false;
            }
        } else if ($this->current_currency != 'RMB' && !$this->exchange_rate) {
            return false;
        }

        return true;
    }
    
    /**
     * Check the main currency
     * 
     * @access public
     * @return string
     */
    function current_currency() {
        $currency = get_option('woocommerce_currency');
        return $currency;
    }

    /**
     * Admin Panel Options
     * - Options for bits like 'title' and account etc.
     *
     * @since 1.0
     */
    public function admin_options() {
        ?>
        <h3><?php _e('Alipay', 'alipay'); ?></h3>
        <p><?php _e('Alipay is one of the most widely used payment method in China, customer can pay with or without an alipay account', 'alipay'); ?></p>
        <table class="form-table">
            <?php
            // Generate the HTML For the settings form.
            $this->generate_settings_html();
            ?>
        </table><!--/.form-table-->
        <?php
    }

    /**
     * Get Alipay Args for passing to Alipay
     *
     * @access public
     * @param mixed $order
     * @return array
     */
    function get_alipay_args($order) {
        global $woocommerce, $wpdb;

        $paymethod = 'directPay';
        $order_id = $order->id;

        if ($this->debug == 'yes')
            $this->log->add('alipay', 'Generating payment form for order #' . $order_id . '. Notify URL: ' . $this->notify_url);

        $buyer_name = $order->billing_last_name . $order->billing_first_name;
        if ($this->payment_method == 'direct')
            $service = 'create_direct_pay_by_user';
        else if ($this->payment_method == 'dualfun')
            $service = 'trade_create_by_buyer';
        else if ($this->payment_method == 'escrow')
            $service = 'create_partner_trade_by_buyer';
        $total_fee = $order->get_total();
        
        //Multi-currency supported by WooCommerce Multilingual plugin
        If ($this->multi_currency_enabled && $this->exchange_rate) {
            
            if ('RMB' != get_woocommerce_currency() && $this->current_currency != get_woocommerce_currency()) {
                $sql = "SELECT (value) FROM " . $wpdb->prefix . "icl_currencies WHERE code = '" . get_woocommerce_currency() . "'";
                $currency = $wpdb->get_results($sql, OBJECT);

                if ($currency) {
                    $exchange_rate = $currency[0]->value;
                    $total_fee = round(($total_fee / $exchange_rate) * $this->exchange_rate, 2);
                }
                
            } else if ($this->current_currency == get_woocommerce_currency()) {
                $total_fee = round($total_fee * $this->exchange_rate, 2);
            }
            
        } else {
            if ($this->current_currency != 'RMB' && $this->exchange_rate) {
                $total_fee = round($total_fee * $this->exchange_rate, 2);
            }
        }
        $alipay_args = array(
            "service" => $service,
            "payment_type" => "1",
            "partner" => trim($this->partnerID),
            "_input_charset" => 'utf-8',
            "seller_email" => trim($this->alipay_account),
            "return_url" => $this->get_return_url($order),
            "notify_url" => $this->notify_url,
            "out_trade_no" => $order->order_key . '|' . $order->id,
            "subject" => $buyer_name,
            "body" => $order->customer_note,
            "price" => $total_fee,
            "quantity" => 1
        );

        if ($this->payment_method != 'direct') {
            $add_args = array(
                "logistics_fee" => '0',
                "logistics_type" => 'EXPRESS', //optional EXPRESS（快递）、POST（平邮）、EMS（EMS）
                "logistics_payment" => 'SELLER_PAY', //optional SELLER_PAY（卖家承担运费）、BUYER_PAY（买家承担运费）

                "receive_name" => $buyer_name,
                "receive_address" => $order->billing_address_1,
                "receive_zip" => $order->shipping_postcode,
                //"receive_phone"	=> $order->billing_phone,
                "receive_mobile" => $order->billing_phone
            );
            $alipay_args = array_merge($alipay_args, $add_args);
        }

        $alipay_args = apply_filters('woocommerce_alipay_args', $alipay_args);

        return $alipay_args;
    }

    /**
     * Get Alipay configuration
     *
     * @access public
     * @param mixed $order
     * @return array
     */
    function get_alipay_config($order) {
        $alipay_config = array();
        $alipay_config['partner'] = trim($this->partnerID);
        $alipay_config['key'] = trim($this->secure_key);
        $alipay_config['seller_email'] = trim($this->alipay_account);
        $alipay_config['return_url'] = $this->get_return_url($order);
        $alipay_config['notify_url'] = $this->notify_url;

        $alipay_config['sign_type'] = 'MD5';
        $alipay_config['input_charset'] = 'utf-8';
        $alipay_config['transport'] = 'http';
        $alipay_config = apply_filters('woocommerce_alipay_config_args', $alipay_config);
        return $alipay_config;
    }

    /**
     * Build Alipay Query String for redirection to Alipay using GET method
     *
     * @access public
     * @param mixed $order
     * @return string
     */
    function build_alipay_string($order) {
        require_once( "lib/alipay_service.class.php");
        //Get alipay args
        $alipay_args = $this->get_alipay_args($order);
        $alipay_config = $this->get_alipay_config($order);

        $alipayService = new AlipayService($alipay_config);
        $alipay_submit = new AlipaySubmit();
        $para = $alipay_submit->buildRequestPara($alipay_args, $alipay_config);
        $query_string = http_build_query($para, '', '&');
        $alipay_string = $alipayService->alipay_gateway_new . $query_string;

        return $alipay_string;
    }

    /**
     * Return page of Alipay, show Alipay Trade No. 
     *
     * @access public
     * @param mixed Sync Notification
     * @return void
     */
    function thankyou_page($order_id) {
        global $woocommerce;
        if (isset($_GET['trade_status'])) {
            require_once("lib/alipay_notify.class.php");
            $aliapy_config = $this->get_alipay_config($order);
            $alipayNotify = new AlipayNotify($aliapy_config);

            $get_temp = $_GET;
            unset($_GET['order']);
            unset($_GET['key']);

            if ($this->debug == 'yes')
                $log = true;
            $verify_result = $alipayNotify->verifyReturn($log);
            if ($verify_result) {
                $trade_no = $_GET['trade_no'];
                $order = &new WC_Order($order_id);
                echo '<ul class="order_details">
                        <li class="alipayNo">' . __('Your Alipay Trade No.: ', 'alipay') . '<strong>' . $trade_no . '</strong></li>
                    </ul>';
            }
            $_GET = $get_temp;
        }
    }

    /**
     * Generate the alipay button link (POST method)
     *
     * @access public
     * @param mixed $order_id
     * @return string
     */
    function generate_alipay_form($order_id) {
        global $woocommerce;

        $order = new WC_Order($order_id);
        require_once( "lib/alipay_service.class.php");

        $alipay_args = $this->get_alipay_args($order);
        $alipay_config = $this->get_alipay_config($order);

        $alipayService = new AlipayService($alipay_config);
        $alipay_submit = new AlipaySubmit();
        $alipay_adr = $alipayService->alipay_gateway_new;
        $para = $alipay_submit->buildRequestPara($alipay_args, $alipay_config);

        $alipay_args_array = array();

        foreach ($para as $key => $value) {
            $alipay_args_array[] = '<input type="hidden" name="' . esc_attr($key) . '" value="' . esc_attr($value) . '" />';
        }

        $woocommerce->add_inline_js('
				jQuery("body").block({
						message: "<img src=\"' . esc_url(apply_filters('woocommerce_ajax_loader_url', $woocommerce->plugin_url() . '/assets/images/ajax-loader.gif')) . '\" alt=\"Redirecting&hellip;\" style=\"float:left; margin-right: 10px;\" />' . __('Thank you for your order. We are now redirecting you to Alipay to make payment.', 'alipay') . '",
						overlayCSS:
						{
							background: "#fff",
							opacity: 0.6
						},
						centerY: false,
						css: {
							top:			"20%",
							padding:        20,
							textAlign:      "center",
							color:          "#555",
							border:         "3px solid #aaa",
							backgroundColor:"#fff",
							cursor:         "wait",
							lineHeight:		"32px"
						}
					});
				jQuery("#submit_alipay_payment_form").click();				
			');

        return '<form id="alipaysubmit" name="alipaysubmit" action="' . $alipay_adr . '_input_charset=' . trim(strtolower($alipay_config['input_charset'])) . '" method="post" target="_top">' . implode('', $alipay_args_array) . '
					<input type="submit" class="button-alt" id="submit_alipay_payment_form" value="' . __('Pay via Alipay', 'alipay') . '" /> <a class="button cancel" href="' . esc_url($order->get_cancel_order_url()) . '">' . __('Cancel order &amp; restore cart', 'alipay') . '</a>
				</form>';
    }

    /**
     * Process the payment and return the result
     *
     * @access public
     * @param int $order_id
     * @return array
     */
    function process_payment($order_id) {
        global $woocommerce;
        $order = new WC_Order($order_id);
        if (!$this->form_submission_method) {
            $redirect = $this->build_alipay_string($order);
            if ($this->debug == 'yes')
                $this->log->add('alipay', 'Query string: ' . $redirect);
            return array(
                'result' => 'success',
                'redirect' => $redirect
            );
        } else {
            return array(
                'result' => 'success',
                'redirect' => add_query_arg('order', $order->id, add_query_arg('key', $order->order_key, get_permalink(woocommerce_get_page_id('pay'))))
            );
        }
    }

    /**
     * Output for the order received page.
     *
     * @access public
     * @return void
     */
    function receipt_page($order) {

        echo '<p>' . __('Thank you for your order, please click the button below to pay with Alipay.', 'alipay') . '</p>';

        echo $this->generate_alipay_form($order);
    }

    /**
     * Check for Alipay IPN Response
     *
     * @access public
     * @return void
     */
    function check_alipay_response() {
        global $woocommerce;
        @ob_clean();
        if (isset($_POST['seller_id']) && $_POST['seller_id'] == $this->partnerID) {
            if ($this->debug == 'yes')
                $this->log->add('alipay', 'Received notification from Alipay, the order number is: ' . $_POST['out_trade_no']);

            //Get order id
            $out_trade_no = $_POST['out_trade_no'];
            $array = explode('|', $out_trade_no);
            $order_id = $array[1];
            if (!$order_id || !is_numeric($order_id))
                wp_die("Invalid Order ID");

            //Get alipay config
            $order = new WC_Order($order_id);
            $alipay_config = $this->get_alipay_config($order);

            //Verify alipay's notification
            require_once("lib/alipay_notify.class.php");
            $alipayNotify = new AlipayNotify($alipay_config);

            //Log verification
            if ($this->debug == 'yes')
                $log = true;
            $verify_result = $alipayNotify->verifyNotify($log);

            if ($this->debug == 'yes') {
                $verify_result = $verify_result ? 'Valid' : 'Invalid';
                if ($this->debug == 'yes')
                    $this->log->add('alipay', 'Verification result: ' . $verify_result);
            }

            if ($verify_result) {

                if ($this->payment_method == 'direct') {
                    if ($_POST['trade_status'] == 'TRADE_FINISHED' || $_POST['trade_status'] == 'TRADE_SUCCESS') {
                        $order->add_order_note(__('The order is completed', 'alipay'));
                        $order->payment_complete();
                        $this->successful_request($_POST);
                    }
                } else {
                    if ($_POST['trade_status'] == 'WAIT_BUYER_PAY') {
                        $order->add_order_note(__('Order received, awaiting payment', 'alipay'));
                        $this->successful_request($_POST);
                    } else if ($_POST['trade_status'] == 'WAIT_SELLER_SEND_GOODS') {
                        $order->update_status('processing', __('Payment received, awaiting fulfilment', 'alipay'));
                        $woocommerce->cart->empty_cart();
                        $this->successful_request($_POST);
                    } else if ($_POST['trade_status'] == 'WAIT_BUYER_CONFIRM_GOODS') {
                        $order->add_order_note(__('Your order has been shipped, awaiting buyer\'s confirmation', 'alipay'));
                        $this->successful_request($_POST);
                    } else if ($_POST['trade_status'] == 'TRADE_FINISHED') {
                        $order->payment_complete();
                        $order->add_order_note(__('The order is completed', 'alipay'));
                        $this->successful_request($_POST);
                    } else {
                        header('HTTP/1.1 200 OK');
                        echo "success";
                        exit;
                    }
                }
            } else {
                wp_die("fail");
            }
        } else {
            wp_die("Alipay Notification Request Failure");
        }
    }

    /**
     * Successful Payment!
     *
     * @access public
     * @param array $posted
     * @return void
     */
    function successful_request($posted) {
        if ($this->debug == 'yes')
            $this->log->add('alipay', 'Trade Status Received: [' . $posted['trade_status'] . '] For Order: [' . $_POST['out_trade_no'] . ']');
        header('HTTP/1.1 200 OK');
        echo "success";
        exit;
    }

}
?>