<?php


/**
 * @see https://developer.paypal.com/docs/checkout/standard/integrate/#link-integratebackend
 */


/**
 *
 */
function fipfcard_paypal_order()
{
	// json decode from JSON.stringify : https://stackoverflow.com/q/15986235/9497573
	$data_received = json_decode( html_entity_decode( stripslashes( $_POST['data'] ) ) );
//	error_log( "data_received" );
//	error_log( json_encode( $data_received ) );

	// use the cart information passed from the front-end to calculate the order amount detals
	$cart = $data_received->cart;
	error_log( "cart" );
	error_log( json_encode( $cart ) );
	create_order($cart);

	wp_send_json_success(
		array(
			'from paypal_order',
			"data_received" => $data_received,
		),
		200
	);
}
add_action( 'wp_ajax_paypal_orders', 'fipfcard_paypal_order' );


/**
 * Generate an OAuth 2.0 access token for authenticating with PayPal REST APIs.
 * @see https://developer.paypal.com/docs/checkout/standard/integrate/#link-integratebackend
 * @see https://developer.paypal.com/api/rest/authentication/
 */
function generate_access_token( )
{
	$base = "https://api-m.sandbox.paypal.com";

	try {
		if ( !PAYPAL_CLIENT_ID || !PAYPAL_CLIENT_SECRET ) {
			throw new Error( "MISSING_API_CREDENTIALS" );
		}
		$credentials = PAYPAL_CLIENT_ID . ":" . PAYPAL_CLIENT_SECRET;
		$auth = base64_encode($credentials);

		$url = $base . '/v1/oauth2/token';
		$body = http_build_query(array('grant_type' => 'client_credentials'));
		// Initialize curl
		$ch = curl_init();
		// Set curl options
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_POST, true);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_HTTPHEADER, array(
			'Authorization: Basic ' . $auth,
		));
		// Execute curl and get the response
		$data_json = curl_exec($ch);

		if ( $data_json === false)
			throw new Error('cURL error: ' . curl_error($ch));
		// Close curl
		curl_close($ch);

		$data = json_decode($data_json);

    return $data->access_token;
  }
	catch (Throwable $error) {
    error_log("Failed to generate Access Token:");
    error_log($error->getMessage());
  }
};
/*
*/


/**
 * Create an order to start the transaction.
 * @see https://developer.paypal.com/docs/api/orders/v2/#orders_create
 */

function create_order( $cart )
{

  // use the cart information passed from the front-end to calculate the purchase unit details

  $access_token = generate_access_token();
	error_log("access_token:");
	error_log($access_token);
  
/*


  const url = `${base}/v2/checkout/orders`;

  const payload = {

    intent: "CAPTURE",

    purchase_units: [

      {

        amount: {

          currency_code: "USD",

          value: "100.00",

        },

      },

    ],

  };

  
  const response = await fetch(url, {

    headers: {

      "Content-Type": "application/json",

      Authorization: `Bearer ${accessToken}`,

      // Uncomment one of these to force an error for negative testing (in sandbox mode only). Documentation:

      // https://developer.paypal.com/tools/sandbox/negative-testing/request-headers/

      // "PayPal-Mock-Response": '{"mock_application_codes": "MISSING_REQUIRED_PARAMETER"}'

      // "PayPal-Mock-Response": '{"mock_application_codes": "PERMISSION_DENIED"}'

      // "PayPal-Mock-Response": '{"mock_application_codes": "INTERNAL_SERVER_ERROR"}'

    },

    method: "POST",

    body: JSON.stringify(payload),

  });

  
  return handleResponse(response);

*/
};


?>