<?php 
/** 
 * 
 * This PayPal Checkout API handler class is a custom PHP library to handle the PayPal REST API calls. 
 * 
 * @class   PaypalCheckout 
 * @author  CodexWorld 
 * @link    https://www.codexworld.com 
 * @version 1.0 
 */ 

// Include the configuration file
include_once 'config.php';

class PaypalCheckout{ 
    public $paypalAuthAPI   = PAYPAL_SANDBOX?'https://api-m.sandbox.paypal.com/v1/oauth2/token':'https://api-m.paypal.com/v1/oauth2/token';
	public $paypalAPI    = PAYPAL_SANDBOX?'https://api-m.sandbox.paypal.com/v2/checkout':'https://api-m.paypal.com/v2/checkout';
    public $paypalClientID  = PAYPAL_SANDBOX?PAYPAL_SANDBOX_CLIENT_ID:PAYPAL_PROD_CLIENT_ID; 
    private $paypalSecret   = PAYPAL_SANDBOX?PAYPAL_SANDBOX_CLIENT_SECRET:PAYPAL_PROD_CLIENT_SECRET; 
    
    public function generateAccessToken(){
    
        $ch = curl_init(); 
        curl_setopt($ch, CURLOPT_VERBOSE,1);
        curl_setopt($ch, CURLOPT_URL, $this->paypalAuthAPI); 
        curl_setopt($ch, CURLOPT_HEADER, false); 
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); 
        curl_setopt($ch, CURLOPT_POST, true); 
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
        curl_setopt($ch, CURLOPT_USERPWD, $this->paypalClientID.":".$this->paypalSecret); 
        curl_setopt($ch, CURLOPT_POSTFIELDS, "grant_type=client_credentials"); 
        $auth_response = json_decode(curl_exec($ch));
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch); 
	
        if ($http_code != 200 && !empty($auth_response->error)) { 
            throw new Exception('Failed to generate Access Token: '.$auth_response->error.' >>> '.$auth_response->error_description); 
        }
         
        if(!empty($auth_response)){
            return $auth_response->access_token; 
        }else{
            return false;
        }
    }

    public function createOrder($productInfo, $paymentSource){
        $accessToken = $this->generateAccessToken();
        if(empty($accessToken)){
            return false; 
        }else{
            $postParams = array(
                "intent" => "CAPTURE",
                "purchase_units" => array(
                    array(
                        "custom_id" => $productInfo['item_number'],
                        "description" => $productInfo['item_name'],
                        "amount" => array(
                            "currency_code" => $productInfo['currency'],
                            "value" => $productInfo['price']
                        )
                    )
                )
            );

            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $this->paypalAPI.'/orders/');
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); 
           
            curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json', 'Authorization: Bearer '. $accessToken)); 
            curl_setopt($ch, CURLOPT_POST, true);
            curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($postParams));

            $api_resp = curl_exec($ch);
            $api_data = json_decode($api_resp, true);
            $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE); 
            curl_close($ch);

            if ($http_code != 200 && $http_code != 201) { 
                throw new Exception('Failed to create Order sl ('.$http_code.'): '.$api_resp.json_encode($postParams));
            }

            return !empty($api_data) && ($http_code == 200 || $http_code == 201)?$api_data:false;
        }
    }

    public function captureOrder($orderId){
        $accessToken = $this->generateAccessToken();
        if(empty($accessToken)){
            return false; 
        }else{
              $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $this->paypalAPI.'/orders/'.$orderId.'/capture');
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); 
            curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json', 'Authorization: Bearer '. $accessToken));

            curl_setopt($ch, CURLOPT_POST, true);
            $api_resp = curl_exec($ch);
            $api_data = json_decode($api_resp, true);
            $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
            $curlsl_code = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
            //  $result = urldecode ($ch );
          

        

           
         $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
     

            if ($http_code != 200 && $http_code != 201) { 
          
                throw new Exception('Failed to create Order sl4('.$http_code.'): '.'1- '.$api_resp );
            }

            curl_close($ch);
            return !empty($api_data) && ($http_code == 200 || $http_code == 201)?$api_data:false;
        }
    }
}