<?php
/**
 * PayPal Standard Payment Gateway
 * 
 * Provides a PayPal Standard Payment Gateway.
 *
 * @class 		WC_Paypal
 * @package		WooCommerce
 * @category	Payment Gateways
 * @author		WooThemes
 */
class WC_Paypal extends WC_Payment_Gateway {
		
	public function __construct() { 
		global $woocommerce;
		
        $this->id			= 'paypal';
        $this->icon 		= apply_filters('woocommerce_paypal_icon', $woocommerce->plugin_url() . '/assets/images/icons/paypal.png');
        $this->has_fields 	= false;
        $this->liveurl 		= 'https://www.paypal.com/webscr';
		$this->testurl 		= 'https://www.sandbox.paypal.com/webscr';
        $this->method_title     = __( 'Paypal', 'woocommerce' );
		
		
		// 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->email 			= $this->settings['email'];
		$this->testmode			= $this->settings['testmode'];		
		$this->send_shipping	= $this->settings['send_shipping'];
		$this->address_override	= isset( $this->settings['address_override'] ) ? $this->settings['address_override'] : 'no';
		$this->debug			= $this->settings['debug'];	
		$this->form_submission_method = ( isset( $this->settings['form_submission_method'] ) && $this->settings['form_submission_method'] == 'yes' ) ? true : false;
		
		// Logs
		if ($this->debug=='yes') $this->log = $woocommerce->logger();
		
		// Actions
		add_action( 'init', array(&$this, 'check_ipn_response') );
		add_action('valid-paypal-standard-ipn-request', array(&$this, 'successful_request') );
		add_action('woocommerce_receipt_paypal', array(&$this, 'receipt_page'));
		add_action('woocommerce_update_options_payment_gateways', array(&$this, 'process_admin_options'));
		
		if ( !$this->is_valid_for_use() ) $this->enabled = false;
    } 
    
     /**
     * Check if this gateway is enabled and available in the user's country
     */
    function is_valid_for_use() {
        if (!in_array(get_option('woocommerce_currency'), array('AUD', 'BRL', 'CAD', 'MXN', 'NZD', 'HKD', 'SGD', 'USD', 'EUR', 'JPY', 'TRY', 'NOK', 'CZK', 'DKK', 'HUF', 'ILS', 'MYR', 'PHP', 'PLN', 'SEK', 'CHF', 'TWD', 'THB', 'GBP'))) return false;

        return true;
    }
    
	/**
	 * Admin Panel Options 
	 * - Options for bits like 'title' and availability on a country-by-country basis
	 *
	 * @since 1.0.0
	 */
	public function admin_options() {

    	?>
    	<h3><?php _e('PayPal standard', 'woocommerce'); ?></h3>
    	<p><?php _e('PayPal standard works by sending the user to PayPal to enter their payment information.', 'woocommerce'); ?></p>
    	<table class="form-table">
    	<?php
    		if ( $this->is_valid_for_use() ) :
    	
    			// Generate the HTML For the settings form.
    			$this->generate_settings_html();
    		
    		else :
    		
    			?>
            		<div class="inline error"><p><strong><?php _e( 'Gateway Disabled', 'woocommerce' ); ?></strong>: <?php _e( 'PayPal does not support your store currency.', 'woocommerce' ); ?></p></div>
        		<?php
        		
    		endif;
    	?>
		</table><!--/.form-table-->
    	<?php
    } // End admin_options()
    
	/**
     * Initialise Gateway Settings Form Fields
     */
    function init_form_fields() {
    
    	$this->form_fields = array(
			'enabled' => array(
							'title' => __( 'Enable/Disable', 'woocommerce' ), 
							'type' => 'checkbox', 
							'label' => __( 'Enable PayPal standard', 'woocommerce' ), 
							'default' => 'yes'
						), 
			'title' => array(
							'title' => __( 'Title', 'woocommerce' ), 
							'type' => 'text', 
							'description' => __( 'This controls the title which the user sees during checkout.', 'woocommerce' ), 
							'default' => __( 'PayPal', 'woocommerce' )
						),
			'description' => array(
							'title' => __( 'Description', 'woocommerce' ), 
							'type' => 'textarea', 
							'description' => __( 'This controls the description which the user sees during checkout.', 'woocommerce' ), 
							'default' => __("Pay via PayPal; you can pay with your credit card if you don't have a PayPal account", 'woocommerce')
						),
			'email' => array(
							'title' => __( 'PayPal Email', 'woocommerce' ), 
							'type' => 'text', 
							'description' => __( 'Please enter your PayPal email address; this is needed in order to take payment.', 'woocommerce' ), 
							'default' => ''
						),
			'send_shipping' => array(
							'title' => __( 'Shipping details', 'woocommerce' ), 
							'type' => 'checkbox', 
							'label' => __( 'Send shipping details to PayPal instead of billing.', 'woocommerce' ), 
							'description' => '',
							'description' => __( 'PayPal allows us to send 1 address. If you are using PayPal for shipping labels you may prefer to send the shipping address rather than billing.', 'woocommerce' ),
							'default' => 'no'
						), 
			'address_override' => array(
							'title' => __( 'Address override', 'woocommerce' ), 
							'type' => 'checkbox', 
							'label' => __( 'Enable "address_override" to prevent address information from being changed.', 'woocommerce' ), 
							'description' => __( 'PayPal verifies addresses therefore this setting can cause errors (we recommend keeping it disabled).', 'woocommerce' ),
							'default' => 'no'
						), 
			'form_submission_method' => array(
							'title' => __( 'Submission method', 'woocommerce' ), 
							'type' => 'checkbox', 
							'label' => __( 'Use form submission method.', 'woocommerce' ), 
							'description' => __( 'Enable this to post order data to PayPal via a form instead of using a redirect/querystring.', 'woocommerce' ),
							'default' => 'no'
						), 
			'testmode' => array(
							'title' => __( 'PayPal sandbox', 'woocommerce' ), 
							'type' => 'checkbox', 
							'label' => __( 'Enable PayPal sandbox', 'woocommerce' ), 
							'default' => 'yes',
							'description' => sprintf( __( 'PayPal sandbox can be used to test payments. Sign up for a developer account <a href="%s">here</a>.', 'woocommerce' ), 'https://developer.paypal.com/' ),
						),
			'debug' => array(
							'title' => __( 'Debug Log', 'woocommerce' ), 
							'type' => 'checkbox', 
							'label' => __( 'Enable logging', 'woocommerce' ), 
							'default' => 'no',
							'description' => __( 'Log PayPal events, such as IPN requests, inside <code>woocommerce/logs/paypal.txt</code>' ),
						)
			);
    
    } // End init_form_fields()
    
    /**
	 * There are no payment fields for paypal, but we want to show the description if set.
	 **/
    function payment_fields() {
    	if ($this->description) echo wpautop(wptexturize($this->description));
    }
    
    /**
	 * Get PayPal Args for passing to PP
	 **/
	function get_paypal_args( $order ) {
		global $woocommerce;
		
		$order_id = $order->id;
		
		if ($this->debug=='yes') $this->log->add( 'paypal', 'Generating payment form for order #' . $order_id . '. Notify URL: ' . trailingslashit(home_url()).'?paypalListener=paypal_standard_IPN');
		
		if (in_array($order->billing_country, array('US','CA'))) :
			$order->billing_phone = str_replace(array('(', '-', ' ', ')'), '', $order->billing_phone);
			$phone_args = array(
				'night_phone_a' => substr($order->billing_phone,0,3),
				'night_phone_b' => substr($order->billing_phone,3,3),
				'night_phone_c' => substr($order->billing_phone,6,4),
				'day_phone_a' 	=> substr($order->billing_phone,0,3),
				'day_phone_b' 	=> substr($order->billing_phone,3,3),
				'day_phone_c' 	=> substr($order->billing_phone,6,4)
			);
		else :
			$phone_args = array(
				'night_phone_b' => $order->billing_phone,
				'day_phone_b' 	=> $order->billing_phone
			);
		endif;		
		
		// PayPal Args
		$paypal_args = array_merge(
			array(
				'cmd' 					=> '_cart',
				'business' 				=> $this->email,
				'no_note' 				=> 1,
				'currency_code' 		=> get_option('woocommerce_currency'),
				'charset' 				=> 'UTF-8',
				'rm' 					=> 2,
				'upload' 				=> 1,
				'return' 				=> $this->get_return_url( $order ),
				'cancel_return'			=> $order->get_cancel_order_url(),
				
				// Order key
				'custom'				=> $order_id,
				
				// IPN
				'notify_url'			=> trailingslashit(home_url()).'?paypalListener=paypal_standard_IPN',
				
				// Billing Address info
				'first_name'			=> $order->billing_first_name,
				'last_name'				=> $order->billing_last_name,
				'company'				=> $order->billing_company,
				'address1'				=> $order->billing_address_1,
				'address2'				=> $order->billing_address_2,
				'city'					=> $order->billing_city,
				'state'					=> $order->billing_state,
				'zip'					=> $order->billing_postcode,
				'country'				=> $order->billing_country,
				'email'					=> $order->billing_email,
				
				// Payment Info
				'invoice' 				=> $order->order_key
			), 
			$phone_args
		);
		
		// Shipping
		if ( $this->send_shipping=='yes' ) {
			$paypal_args['address_override'] = ( $this->address_override == 'yes' ) ? 1 : 0;
			
			$paypal_args['no_shipping'] = 0;
			
			// If we are sending shipping, send shipping address instead of billing
			$paypal_args['first_name']		= $order->shipping_first_name;
			$paypal_args['last_name']		= $order->shipping_last_name;
			$paypal_args['company']			= $order->shipping_company;
			$paypal_args['address1']		= $order->shipping_address_1;
			$paypal_args['address2']		= $order->shipping_address_2;
			$paypal_args['city']			= $order->shipping_city;
			$paypal_args['state']			= $order->shipping_state;
			$paypal_args['country']			= $order->shipping_country;
			$paypal_args['zip']				= $order->shipping_postcode;
		} else {
			$paypal_args['no_shipping'] = 1;
		}
		
		// If prices include tax or have order discounts, send the whole order
		if ( get_option('woocommerce_prices_include_tax')=='yes' || $order->get_order_discount() > 0 ) :
			
			// Discount
			$paypal_args['discount_amount_cart'] = $order->get_order_discount();
			
			// Don't pass items - paypal borks tax due to prices including tax. PayPal has no option for tax inclusive pricing sadly. Pass 1 item for the order items overall
			$item_names = array();
			
			if (sizeof($order->get_items())>0) : foreach ($order->get_items() as $item) :
				if ($item['qty']) $item_names[] = $item['name'] . ' x ' . $item['qty'];
			endforeach; endif;
			
			$paypal_args['item_name_1'] 	= sprintf( __('Order %s' , 'woocommerce'), $order->get_order_number() ) . " - " . implode(', ', $item_names);
			$paypal_args['quantity_1'] 		= 1;
			$paypal_args['amount_1'] 		= number_format($order->get_order_total() - $order->get_shipping() + $order->get_order_discount(), 2, '.', '');
			
			// Shipping Cost
			if ($order->get_shipping()>0) :
				$paypal_args['item_name_2'] = __('Shipping via', 'woocommerce') . ' ' . ucwords($order->shipping_method_title);
				$paypal_args['quantity_2'] 	= '1';
				$paypal_args['amount_2'] 	= number_format($order->get_shipping(), 2, '.', '');
			endif;
					
		else :
			
			// Tax
			$paypal_args['tax_cart'] = $order->get_total_tax();

			// Cart Contents
			$item_loop = 0;
			if (sizeof($order->get_items())>0) : foreach ($order->get_items() as $item) :
				if ($item['qty']) :
					
					$item_loop++;
					
					$product = $order->get_product_from_item($item);
					
					$item_name 	= $item['name'];
					
					$item_meta = new order_item_meta( $item['item_meta'] );					
					if ($meta = $item_meta->display( true, true )) :
						$item_name .= ' ('.$meta.')';
					endif;
						
					$paypal_args['item_name_'.$item_loop] = $item_name;
					if ($product->get_sku()) $paypal_args['item_number_'.$item_loop] = $product->get_sku();
					$paypal_args['quantity_'.$item_loop] = $item['qty'];
					$paypal_args['amount_'.$item_loop] = $order->get_item_total( $item, false );
					
				endif;
			endforeach; endif;
		
			// Shipping Cost
			if ($order->get_shipping()>0) :
				$item_loop++;
				$paypal_args['item_name_'.$item_loop] = __('Shipping via', 'woocommerce') . ucwords($order->shipping_method_title);
				$paypal_args['quantity_'.$item_loop] = '1';
				$paypal_args['amount_'.$item_loop] = number_format($order->get_shipping(), 2, '.', '');
			endif;
		
		endif;
		
		$paypal_args = apply_filters( 'woocommerce_paypal_args', $paypal_args );
		
		return $paypal_args;
	}

	/**
	 * Generate the paypal button link
	 **/
    function generate_paypal_form( $order_id ) {
		global $woocommerce;
		
		$order = new WC_Order( $order_id );

		if ( $this->testmode == 'yes' ):
			$paypal_adr = $this->testurl . '?test_ipn=1&';		
		else :
			$paypal_adr = $this->liveurl . '?';		
		endif;
		
		$paypal_args = $this->get_paypal_args( $order );
		
		$paypal_args_array = array();

		foreach ($paypal_args as $key => $value) {
			$paypal_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( $woocommerce->plugin_url() ).'/assets/images/ajax-loader.gif\" alt=\"Redirecting...\" style=\"float:left; margin-right: 10px;\" />'.__('Thank you for your order. We are now redirecting you to PayPal to make payment.', 'woocommerce').'", 
					overlayCSS: 
					{ 
						background: "#fff", 
						opacity: 0.6 
					},
					css: { 
				        padding:        20, 
				        textAlign:      "center", 
				        color:          "#555", 
				        border:         "3px solid #aaa", 
				        backgroundColor:"#fff", 
				        cursor:         "wait",
				        lineHeight:		"32px"
				    } 
				});
			jQuery("#submit_paypal_payment_form").click();
		');
		
		return '<form action="'.esc_url( $paypal_adr ).'" method="post" id="paypal_payment_form" target="_top">
				' . implode('', $paypal_args_array) . '
				<input type="submit" class="button-alt" id="submit_paypal_payment_form" value="'.__('Pay via PayPal', 'woocommerce').'" /> <a class="button cancel" href="'.esc_url( $order->get_cancel_order_url() ).'">'.__('Cancel order &amp; restore cart', 'woocommerce').'</a>
			</form>';
		
	}
	
	/**
	 * Process the payment and return the result
	 **/
	function process_payment( $order_id ) {
		
		$order = new WC_Order( $order_id );
		
		if ( ! $this->form_submission_method ) {
		
			$paypal_args = $this->get_paypal_args( $order );
			
			$paypal_args = http_build_query( $paypal_args );
			
			if ( $this->testmode == 'yes' ):
				$paypal_adr = $this->testurl . '?test_ipn=1&';		
			else :
				$paypal_adr = $this->liveurl . '?';		
			endif;
	
			return array(
				'result' 	=> 'success',
				'redirect'	=> $paypal_adr . $paypal_args
			);
		
		} 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'))))
			);
			
		}
		
	}
	
	/**
	 * receipt_page
	 **/
	function receipt_page( $order ) {
		
		echo '<p>'.__('Thank you for your order, please click the button below to pay with PayPal.', 'woocommerce').'</p>';
		
		echo $this->generate_paypal_form( $order );
		
	}
	
	/**
	 * Check PayPal IPN validity
	 **/
	function check_ipn_request_is_valid() {
		global $woocommerce;
		
		if ($this->debug=='yes') $this->log->add( 'paypal', 'Checking IPN response is valid...' );
    	
    	// Get recieved values from post data
		$received_values = (array) stripslashes_deep( $_POST );
		
		 // Add cmd to the post array
		$received_values['cmd'] = '_notify-validate';

        // Send back post vars to paypal
        $params = array( 
        	'body' 			=> $received_values,
        	'sslverify' 	=> false,
        	'timeout' 		=> 30,
        	'user-agent'	=> 'WooCommerce/'.$woocommerce->version
        );

        // Get url
       	if ( $this->testmode == 'yes' ):
			$paypal_adr = $this->testurl;		
		else :
			$paypal_adr = $this->liveurl;		
		endif;
		
		// Post back to get a response
        $response = wp_remote_post( $paypal_adr, $params );
        
        if ($this->debug=='yes') $this->log->add( 'paypal', 'IPN Response: ' . print_r($response, true) );
        
        // check to see if the request was valid
        if ( !is_wp_error($response) && $response['response']['code'] >= 200 && $response['response']['code'] < 300 && (strcmp( $response['body'], "VERIFIED") == 0)) {
            if ($this->debug=='yes') $this->log->add( 'paypal', 'Received valid response from PayPal' );
            return true;
        } 
        
        if ($this->debug=='yes') :
        	$this->log->add( 'paypal', 'Received invalid response from PayPal' );
        	if (is_wp_error($response)) :
        		$this->log->add( 'paypal', 'Error response: ' . $result->get_error_message() );
        	endif;
        endif;
        
        return false;
    }
	
	/**
	 * Check for PayPal IPN Response
	 **/
	function check_ipn_response() {
			
		if (isset($_GET['paypalListener']) && $_GET['paypalListener'] == 'paypal_standard_IPN'):
			
			@ob_clean();
			
        	$_POST = stripslashes_deep($_POST);
        	
        	if ($this->check_ipn_request_is_valid()) :
        		
        		header('HTTP/1.1 200 OK');
        		
            	do_action("valid-paypal-standard-ipn-request", $_POST);
			
			else :
			
				wp_die("PayPal IPN Request Failure");
			
       		endif;
       		
       	endif;
			
	}
	
	/**
	 * Successful Payment!
	 **/
	function successful_request( $posted ) {
		
		// Custom holds post ID
	    if ( !empty($posted['custom']) && !empty($posted['invoice']) ) {
	
			$order = new WC_Order( (int) $posted['custom'] );
	        if ($order->order_key!==$posted['invoice']) :
	        	if ($this->debug=='yes') $this->log->add( 'paypal', 'Error: Order Key does not match invoice.' );
	        	exit;
	        endif;
	        
	        // Lowercase
	        $posted['payment_status'] = strtolower($posted['payment_status']);
	        $posted['txn_type'] = strtolower($posted['txn_type']);
	        
	        // Sandbox fix
	        if ($posted['test_ipn']==1 && $posted['payment_status']=='pending') $posted['payment_status'] = 'completed';
	        
	        if ($this->debug=='yes') $this->log->add( 'paypal', 'Payment status: ' . $posted['payment_status'] );
	        
	        // We are here so lets check status and do actions
	        switch ($posted['payment_status']) :
	            case 'completed' :
	            	
	            	// Check order not already completed
	            	if ($order->status == 'completed') :
	            		 if ($this->debug=='yes') $this->log->add( 'paypal', 'Aborting, Order #' . $posted['custom'] . ' is already complete.' );
	            		 exit;
	            	endif;
	            	
	            	// Check valid txn_type
	            	$accepted_types = array('cart', 'instant', 'express_checkout', 'web_accept', 'masspay', 'send_money');
					if (!in_array($posted['txn_type'], $accepted_types)) :
						if ($this->debug=='yes') $this->log->add( 'paypal', 'Aborting, Invalid type:' . $posted['txn_type'] );
					endif;
					
					 // Store PP Details
	                update_post_meta( (int) $posted['custom'], 'Payer PayPal address', $posted['payer_email']);
	                update_post_meta( (int) $posted['custom'], 'Transaction ID', $posted['txn_id']);
	                update_post_meta( (int) $posted['custom'], 'Payer first name', $posted['first_name']);
	                update_post_meta( (int) $posted['custom'], 'Payer last name', $posted['last_name']);
	                update_post_meta( (int) $posted['custom'], 'Payment type', $posted['payment_type']); 
	            	
	            	// Payment completed
	                $order->add_order_note( __('IPN payment completed', 'woocommerce') );
	                $order->payment_complete();
	                
	                if ($this->debug=='yes') $this->log->add( 'paypal', 'Payment complete.' );
	                
	            break;
	            case 'denied' :
	            case 'expired' :
	            case 'failed' :
	            case 'voided' :
	                // Order failed
	                $order->update_status('failed', sprintf(__('Payment %s via IPN.', 'woocommerce'), strtolower($posted['payment_status']) ) );
	            break;
	            case "refunded" :
	            
	            	// Only handle full refunds, not partial
	            	if ($order->get_order_total() == ($posted['mc_gross']*-1)) {
	            	
		            	// Mark order as refunded
		            	$order->update_status('refunded', sprintf(__('Payment %s via IPN.', 'woocommerce'), strtolower($posted['payment_status']) ) );
		            	
						$message = woocommerce_mail_template( 
							__('Order refunded/reversed', 'woocommerce'),
							sprintf(__('Order %s has been marked as refunded - PayPal reason code: %s', 'woocommerce'), $order->get_order_number(), $posted['reason_code'] )
						);
					
						// Send the mail
						woocommerce_mail( get_option('woocommerce_new_order_email_recipient'), sprintf( __('Payment for order %s refunded/reversed', 'woocommerce'), $order->get_order_number() ), $message );
					
					}
	            
	            break;
	            case "reversed" :
	            case "chargeback" :
	            	
	            	// Mark order as refunded
	            	$order->update_status('refunded', sprintf( __('Payment %s via IPN.', 'woocommerce'), strtolower( $posted['payment_status'] ) ) );
	            	
					$message = woocommerce_mail_template( 
						__('Order refunded/reversed', 'woocommerce'),
						sprintf(__('Order %s has been marked as refunded - PayPal reason code: %s', 'woocommerce'), $order->get_order_number(), $posted['reason_code'] )
					);
				
					// Send the mail
					woocommerce_mail( get_option('woocommerce_new_order_email_recipient'), sprintf( __('Payment for order %s refunded/reversed', 'woocommerce'), $order->get_order_number() ), $message );
	            	
	            break;
	            default:
	            	// No action
	            break;
	        endswitch;
			
			exit;
			
	    }
		
	}

}

/**
 * Add the gateway to WooCommerce
 **/
function add_paypal_gateway( $methods ) {
	$methods[] = 'WC_Paypal'; return $methods;
}

add_filter('woocommerce_payment_gateways', 'add_paypal_gateway' );