<?php 
/**
* Plugin Name: ZGo Payment Gateway
* Plugin URI: https://vergara.tech' 
* Description: ZGo latest payment processing solution for Woocommerce. Accept payments using Zcash.
* Version: 0.8
* Requires at least: 5.2
* Requires PHP:      7.2
* Author: Vergara Tech LLC 
* Author URI: https://vergara.tech
* License:           GPL v2 or later
* License URI:       https://www.gnu.org/licenses/gpl-2.0.html
**/

if ( ! defined( 'ABSPATH' ) ) {
    exit; // Exit if accessed directly
}

if ( ! in_array( 'woocommerce/woocommerce.php', 
       apply_filters('active_plugins',
       get_option('active_plugins') ) ) ) {
	return;
}

add_action( 'plugins_loaded', 'zgopmt_init' );
function zgopmt_init() {

    if ( ! class_exists( 'WC_Payment_Gateway' ) ) {

       return;

    }

	class WC_ZGopmt_Gateway extends WC_Payment_Gateway {

		public $domain;
		public $zgoownerid;
		public $zgotoken;
		public $siteURL;
      	public $zpmtdb; 

	   /**
	   * Constructor for the gateway.
	   */
	   public function __construct() {

	   		global $wpdb;

		 	$this->console_log("Gateway constructor accesed.");

		 	$this->console_log('Create zgo_payments table if not exists...');
		 	// 
		 	// Create payments table in WordPress database
		 	//
         	$sql = 'create table if not exists zgo_payments (' .
                'pmt_orderid varchar(64),' .
                'pmt_wc_order varchar(20),' .
				'pmt_wc_custname varchar(100),' .
				'pmt_accepted varchar(30),' .
				'pmt_confirmed varchar(30),' .
				'pmt_amount double (12,2) not null default 0.0,' .
				'pmt_rate double (8,2) not null default 0.0,' .
				'pmt_zec double (12,8) not null default 0.0,' .
				'pmt_wc_paid int not null default 0,' .
				'unique pmt_orderix (pmt_orderid, pmt_wc_order) )';
         	$this->console_log('Create table Query -> ' . $sql);
         	$wpdb->query($sql);
         	$this->console_log('zgopayments Table created in MySQL ...');

			$iconurl = plugin_dir_url( __FILE__ ) . 
			      'assets/zgo-icon-full_6pct.png'; 

			$this->siteURL = get_site_url();
			$this->console_log("Site URL: " . $this->siteURL);

			$this->domain = 'zgopmtgwy';

			$this->id = "zgo_payment";
			$this->icon = $iconurl; 
			$this->has_fields = false;
			$this->method_title = __('ZGo Payment', 
				                     $this->domain);
			$this->method_description = __('ZGo Payment - Accept payments using Zcash.', $this->domain);
         // Load the settings.
			$this->init_form_fields();
			$this->init_settings();

			$this->title = $this->get_option('title');
			$this->description = $this->get_option('description');
			$this->instructions = $this->get_option('instructions', $this->description );
			$this->zgoownerid = $this->get_option('zgoownerid');
			$this->zgotoken = $this->get_option('zgotoken');

			// Actions
			add_action('woocommerce_update_options_payment_gateways_' . 
            			$this->id, 
            			array( $this, 'process_admin_options' ) );

        	add_action( 'woocommerce_thankyou_' . $this->id, array( $this, 'thankyou_page' ) );

			if ( ! $this->is_valid_for_use() ) 
				$this->enabled = false;
			/**
			* Add the webhook for payment confirmation from ZGo
			*/
			add_action( 'woocommerce_api_zpmtcallback', array($this,'zconfirm'));	
	    }

		public function init_form_fields() {

			$this->form_fields = apply_filters( 
				   'woo_zgopmtsrv_fields', array( 
					  'enabled' => array(
	                    'title' => __('Enable/Disable', 
	                                  $this->domain ),
	                    'type' => 'checkbox',
	                    'label' => __('Enable payments with Zcash', $this->domain ),
	                    'default' => 'yes'
						),
	                'title' => array(
	                    'title' => __( 'ZGo Payment Service title', 
	                    	$this->domain ),
	                    'type' => 'text',
	                    'default' => __( 'ZGo Payment Gateway', 
	                        $this->domain ),
	                    'desc_tip' => true,
	                    'description' => __( 'Add a new title for the ZGo Payment Service that your customers will see when they are in the checkout page', 
	                        $this->domain ),
	                ),
	                'description' => array(
	                    'title' => __( 'ZGo Payment Service Confirmation', 
	                    	$this->domain ),
	                    'type' => 'textarea',
	                    'default' => __( '<b>Pay with Zcash</b>, ZGo will report your payment as soon as it gets confirmed. Normally it takes about 5 minutes.<br> <a href="https://zgo.cash" target="_blank">Read more...</a>', 
	                        $this->domain ),
	                    'desc_tip' => true,
	                    'description' => __('Payment confirmation description that the customer will see on your checkout.', 
	                        $this->domain ),
	                ),
	                'instructions' => array(
	                    'title' => __('Instructions', 
	                    	$this->domain ),
	                    'type' => 'textarea',
	                    'default' => __('Default instrctions', 
	                        $this->domain ),
	                    'desc_tip' => true,
	                    'description' => __('Instruction that will be added to the Thank You page and order email', 
	                        $this->domain ),
	                ),
	                'zgoownerid' => array(
	                    'title' => __( 'ZGo OwnerId', 
	                    	$this->domain ),
	                    'type' => 'text',
	                    'default' => __( ' ', 
	                        $this->domain ),
	                    'desc_tip' => true,
	                    'description' => __( 'Type or paste your ZGo Account Owner Id (Found in your ZGo Shop Settings)', 
	                        $this->domain ),
	                ),
	                'zgotoken' => array(
	                    'title' => __( 'ZGo Token', 
	                    	$this->domain ),
	                    'type' => 'text',
	                    'default' => __( ' ', 
	                        $this->domain ),
	                    'desc_tip' => true,
	                    'description' => __( 'Type or paste your ZGo Token (Found in your ZGo Shop Settings)', 
	                        $this->domain ),
	                ),
	            )    
			);	
		}

		/*
		* Check if configuration is valid
		*/
	   	public function is_valid_for_use() {
	   	
	   		$isvalid = false;

		   	if ( isset($this->zgoownerid) && 
			     ($this->zgoownerid !== '') ) {

				$url = 'https://test.zgo.cash/auth?ownerid=' .
				   $this->zgoownerid . '&token=' .
				   $this->zgotoken . '&siteurl=' .
				   $this->base64url_encode($this->siteURL);

	        $this->console_log('URL -> ' . $url );

			$response =  wp_remote_get($url);  
	        $this->console_log(json_encode($response));
            
			$httpcode = wp_remote_retrieve_response_code( $response );
	        $this->console_log('Status Code -> ' . $httpcode );

			switch ( $httpcode ) {
				case 200:	
					$body = wp_remote_retrieve_body( $response );
					$oid = json_decode($body);
					$this->console_log('Body -> ' . $body);
	  				$isvalid = $oid->{'authorized'};
	  				break;
	  			case 202:
	  			    $body = wp_remote_retrieve_body($response );
					$oid = json_decode($body);
					$this->console_log('message -> ' . $oid->{'message'});
 					break;
				default:
					$this->console_log('Conection error..');
	  				break;
	 			} 
	 		}
			return $isvalid;
		}

		/*
		* Process Payment
		*/
		public function process_payment( $order_id ) {

			global $wpdb;

			$this->console_log('Site URL ->' . $this->siteURL);
   			$this->console_log('Processing payment for order ' . $order_id);

			$order = wc_get_order( $order_id );
//   			$wc_order = wc_get_product($order_id);
			$wc_order_key = $order->get_order_key();

			$this->console_log('Order ' . $order_id . ' key = ' . $wc_order_key);

			$url = 'https://test.zgo.cash/woopayment' .
				'?ownerid=' . $this->zgoownerid . 
				'&token='  . $this->zgotoken .
  			    '&order_id=' . $order_id .
				'&currency=' . strtolower($order->get_currency()) .
				'&amount=' . $order->get_total() .
				'&date=' . date_format($order->get_date_created(),'Y-m-d') .
            	'&siteurl=' . $this->base64url_encode($this->siteURL) .
            	'&orderkey=' . $wc_order_key;

            	//'&orderkey=' . ;

			$this->console_log('ZGoPayment URL -> ' . $url);
			$this->console_log('Calling wp_remote_get()');		
			$response = wp_remote_get($url);
			$httpcode = wp_remote_retrieve_response_code( $response );

         	$this->console_log('Status Code ->' . $httpcode );

			switch ( $httpcode ) {
				case 200:
					wc_add_notice( 'Order on hold, please wait for confirmation');
					$order->update_status('on_hold',__('Awaiting payment confirmation','woocommerce'));
					$this->console_log('Order ' . $order_id . ' status set to ON_HOLD');

					$body = wp_remote_retrieve_body( $response );
			        $this->console_log('res. body = ' . $body);

					$oid = json_decode($body);
	  				$zgoOrderid = $oid->{'order'};
			        $this->console_log('ZGo order = ' . $zgoOrderid);
			        // 
			        // Save ZGo Order ID and Cart order 
			        //
			        $this->console_log("Preparing SQL insert statement");
					$sql = "replace into zgo_payments (" .
					      "pmt_orderid," .
					      "pmt_wc_order," .
					      "pmt_wc_custname," .
					      "pmt_accepted," .
					      "pmt_confirmed," .
					      "pmt_amount," .
					      "pmt_rate," .
					      "pmt_zec," .
					      "pmt_wc_paid) values ('" .
                    	  $zgoOrderid . "','" .
                    	  $order_id . "','" .
                    	  $order->get_billing_first_name() . " " . 
                    	  $order->get_billing_last_name() . "','" .
                       	  date('Y-m-d H:i:s') . "','',".
                     	  $order->get_total() . 
                     	  ",0,0,0)";
                    $this->console_log($sql);
                    $wpdb->query($sql);

					// Remove cart.
					WC()->cart->empty_cart();

					$this->console_log($this->get_return_url( $order ));
					
					return array(
					 	'result' => 'success',
					    'redirect' => 'https://dev.zgo.cash/invoice/' . $zgoOrderid,
					);
					break;
				case 202:
					 $body = wp_remote_retrieve_body( $response );
			         $this->console_log('res. body = ' . $body);

					 $msg = json_decode($body);
					 $this->console_log('Order ' . $order_id . ' -> ZGo Order Generation Error : '  . $msg->{'message'});

					 $order->update_status('failed',__('Order ' . $order_id . ' -> ZGo Order Generation Error : '  . $msg->{'message'},'woocommerce'));

					break;		
				default:
				  	return;
			}
		}	

		/**
		* Confirm payment and complete order
		*/
		public function zconfirm() {

	   		global $wpdb;
	   		
			$this->console_log('zconfirm called ');
			
			$token = $_GET['token'];
			$zgoOrderid =  $_GET['orderid'];
			$orderid = $_GET['wc_orderid'];
			$totalzec = $_GET['totalzec'];
			$rate = $_GET['rate'];
			$order = wc_get_order( $orderid );

			$sql = "select * from zgo_payments where pmt_wc_order = '" . $orderid . "';";
			$this->console_log('SQL -> ' . $sql);
			$result = $wpdb->get_row($sql,OBJECT);
			if ( ! is_null($result) ) {

				$this->console_log('Query successfull...');
				$this->console_log('totalzec -> ', $totalzec);
				$this->console_log('rate -> ', $rate);
				$this->console_log('pmt_wc_paid=' . $result->pmt_wc_paid);
				$this->console_log('local token -> ' . $this->zgotoken);
				$this->console_log('received token -> ' . $token);
				$this->console_log('zgoOrderid -> ' . $zgoOrderid);
				$this->console_log('pmt_orderid -> ' . $result->pmt_orderid);

				if ( ( $token == $this->zgotoken )
				     && ( $result->pmt_orderid == $zgoOrderid )
				     && ( $result->pmt_wc_paid == '0' ) ) {      
					$this->console_log('Test successfull...');
					$this->console_log('Order status -> ' . $order->get_status());
					switch ( $order->get_status() ) {
						case 'pending':
						case 'failed':
						   $this->console_log('Confirming payment for order ' . $orderid);
							$order->payment_complete();
							$order->reduce_order_stock();
					      	// 
					     	//  Mark order as completed in ZGo DB
					      	//
							$sql = "update zgo_payments set " .
							   	"pmt_confirmed='" . date('Y-m-d H:i:s') . 
 					      		"', pmt_rate=" . $rate . 
 					      		", pmt_zec=" . $totalzec .
							   	", pmt_wc_paid=1 " .
							   	" where pmt_wc_order='" . $orderid . "';";
/*
		               		$this->zpmtdb->exec($sql);
*/
		               		$this->console_log($sql);
		               		$wpdb->query($sql);	
		               		$this->console_log('Order marked as paid in zgo_payments table...');

							update_option('webhook_debug', $_GET);
							break;
						default:
						   $this->console_log('Order ' . $orderid . ' already paid or cancelled...');
						   break;
					} 
				} else {
					$this->console_log('Invalid parameters...');
				}
			} else {
				$this->console_log('Database error...');
			}	
		}

		public function thankyou_page () {
	         if ( $description = $this->get_description() ) {
	             echo wpautop( wptexturize( $description ) );
	         }
		}

		public function console_log($data) {

			$file = plugin_dir_path( __DIR__ ) . '/zgopmtgwy/assets/console.log'; 
			file_put_contents($file, $data . chr(0x0D) . chr(0x0A), FILE_TEXT | FILE_APPEND | LOCK_EX );
 
		}

		public function base64url_encode($data) {

	        $edata = str_replace('=','',strtr(base64_encode($data), '+/', '-_'));
  			return $edata;
		}

    }

	add_filter( 'woocommerce_payment_gateways', 
	            'add_custom_gateway_class' );
	function add_custom_gateway_class( $methods ) {
		if ( ! in_array('WC_ZGopmt_Gateway', $methods) ) {
	     $methods[] = 'WC_ZGopmt_Gateway';
	   }  
	   return $methods;
	}


}