<?php
/*
 * PayPal API Module
 *
 * Defines all the global variables and the wrapper functions
 */
$PROXY_HOST = '127.0.0.1';
$PROXY_PORT = '808';

$SandboxFlag = $pruebas;

/**
 * PayPal API Credentials
 * Replace <API_USERNAME> with your API Username
 * Replace <API_PASSWORD> with your API Password
 * Replace <API_SIGNATURE> with your Signature.
 */
$API_UserName = $paypalUsername;
$API_Password = $paypalPassword;
$API_Signature = $paypalSignature;

// BN Code is only applicable for partners
$sBNCode = "PP-ECWizard";

/**
 * Define the PayPal Redirect URLs.
 * This is the URL that the buyer is first sent to do authorize payment with their paypal account
 * change the URL depending if you are testing on the sandbox or the live PayPal site.
 *
 * For the sandbox, the URL is https://www.sandbox.paypal.com/webscr&cmd=_express-checkout&token=
 * For the live site, the URL is https://www.paypal.com/webscr&cmd=_express-checkout&token=
 */
if ($SandboxFlag == true) {
    $API_Endpoint = "https://api-3t.sandbox.paypal.com/nvp";
    $PAYPAL_URL = "https://www.sandbox.paypal.com/webscr?cmd=_express-checkout&token=";
} else {
    $API_Endpoint = "https://api-3t.paypal.com/nvp";
    $PAYPAL_URL = "https://www.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=";
}

$USE_PROXY = false;
$version = "93";

if (session_id() == "") {
    session_start();
}

/**
 * An express checkout transaction starts with a token, that
 * identifies to PayPal your transaction
 * In this example, when the script sees a token, the script
 * knows that the buyer has already authorized payment through
 * paypal.  If no token was found, the action is to send the buyer
 * to PayPal to first authorize payment.
 */

/**
 * Purpose:    Prepares the parameters for the SetExpressCheckout API Call.
 * Inputs:
 *        paymentAmount:    Total value of the shopping cart
 *        currencyCodeType:    Currency code value the PayPal API
 *        paymentType:        paymentType has to be one of the following values: Sale or Order or Authorization
 *        returnURL:            the page where buyers return to after they are done with the payment review on PayPal
 *        cancelURL:            the page where buyers return to when they cancel the payment review on PayPal.
 */
function CallShortcutExpressCheckout($paymentAmount, $currencyCodeType, $paymentType, $returnURL, $cancelURL, $extra)
{
    // Construct the parameter string that describes the SetExpressCheckout API call in the shortcut implementation
    $nvpstr = "&PAYMENTREQUEST_0_AMT=".$paymentAmount;
    $nvpstr .= "&PAYMENTREQUEST_0_ITEMAMT=".$paymentAmount;
    $nvpstr .= "&PAYMENTREQUEST_0_PAYMENTACTION=".$paymentType;
    $nvpstr .= "&RETURNURL=".$returnURL;
    $nvpstr .= "&CANCELURL=".$cancelURL;
    $nvpstr .= "&PAYMENTREQUEST_0_CURRENCYCODE=".$currencyCodeType;
    $nvpstr .= $extra;

    $_SESSION["currencyCodeType"] = $currencyCodeType;
    $_SESSION["PaymentType"] = $paymentType;

    /**
     * Make the API call to PayPal
     * If the API call succeded, then redirect the buyer to PayPal to begin to authorize payment.
     * If an error occured, show the resulting errors.
     */
    $resArray = hash_call("SetExpressCheckout", $nvpstr);
    $ack = strtoupper($resArray["ACK"]);
    if ($ack == "SUCCESS" || $ack == "SUCCESSWITHWARNING") {
        $token = urldecode($resArray["TOKEN"]);
        $_SESSION['TOKEN'] = $token;
    }

    return $resArray;
}

/**
 * Purpose:    Prepares the parameters for the SetExpressCheckout API Call.
 * Inputs:
 *        paymentAmount:    Total value of the shopping cart
 *        currencyCodeType:    Currency code value the PayPal API
 *        paymentType:        paymentType has to be one of the following values: Sale or Order or Authorization
 *        returnURL:            the page where buyers return to after they are done with the payment review on PayPal
 *        cancelURL:            the page where buyers return to when they cancel the payment review on PayPal
 *        shipToName:        the Ship to name entered on the merchant's site
 *        shipToStreet:        the Ship to Street entered on the merchant's site
 *        shipToCity:            the Ship to City entered on the merchant's site
 *        shipToState:        the Ship to State entered on the merchant's site
 *        shipToCountryCode:    the Code for Ship to Country entered on the merchant's site
 *        shipToZip:            the Ship to ZipCode entered on the merchant's site
 *        shipToStreet2:        the Ship to Street2 entered on the merchant's site
 *        phoneNum:            the phoneNum  entered on the merchant's site.
 */
function CallMarkExpressCheckout(
    $paymentAmount,
    $currencyCodeType,
    $paymentType,
    $returnURL,
    $cancelURL,
    $shipToName,
    $shipToStreet,
    $shipToCity,
    $shipToState,
    $shipToCountryCode,
    $shipToZip,
    $shipToStreet2,
    $phoneNum
) {
    // Construct the parameter string that describes the SetExpressCheckout API call in the shortcut implementation
    $nvpstr = "&PAYMENTREQUEST_0_AMT=".$paymentAmount;
    $nvpstr = $nvpstr."&PAYMENTREQUEST_0_PAYMENTACTION=".$paymentType;
    $nvpstr = $nvpstr."&RETURNURL=".$returnURL;
    $nvpstr = $nvpstr."&CANCELURL=".$cancelURL;
    $nvpstr = $nvpstr."&PAYMENTREQUEST_0_CURRENCYCODE=".$currencyCodeType;
    $nvpstr = $nvpstr."&ADDROVERRIDE=1";
    $nvpstr = $nvpstr."&PAYMENTREQUEST_0_SHIPTONAME=".$shipToName;
    $nvpstr = $nvpstr."&PAYMENTREQUEST_0_SHIPTOSTREET=".$shipToStreet;
    $nvpstr = $nvpstr."&PAYMENTREQUEST_0_SHIPTOSTREET2=".$shipToStreet2;
    $nvpstr = $nvpstr."&PAYMENTREQUEST_0_SHIPTOCITY=".$shipToCity;
    $nvpstr = $nvpstr."&PAYMENTREQUEST_0_SHIPTOSTATE=".$shipToState;
    $nvpstr = $nvpstr."&PAYMENTREQUEST_0_SHIPTOCOUNTRYCODE=".$shipToCountryCode;
    $nvpstr = $nvpstr."&PAYMENTREQUEST_0_SHIPTOZIP=".$shipToZip;
    $nvpstr = $nvpstr."&PAYMENTREQUEST_0_SHIPTOPHONENUM=".$phoneNum;

    $_SESSION["currencyCodeType"] = $currencyCodeType;
    $_SESSION["PaymentType"] = $paymentType;

    /**
     * Make the API call to PayPal
     * If the API call succeded, then redirect the buyer to PayPal to begin to authorize payment.
     * If an error occured, show the resulting errors.
     */
    $resArray = hash_call("SetExpressCheckout", $nvpstr);
    $ack = strtoupper($resArray["ACK"]);
    if ($ack == "SUCCESS" || $ack == "SUCCESSWITHWARNING") {
        $token = urldecode($resArray["TOKEN"]);
        $_SESSION['TOKEN'] = $token;
    }

    return $resArray;
}

/**
 * Purpose: Prepares the parameters for the GetExpressCheckoutDetails API Call.
 *
 * Inputs:
 *        None
 * Returns:
 *        The NVP Collection object of the GetExpressCheckoutDetails Call Response.
 */
function GetShippingDetails($token)
{
    /**
     * At this point, the buyer has completed authorizing the payment
     * at PayPal.  The function will call PayPal to obtain the details
     * of the authorization, including any shipping information of the
     * buyer.  Remember, the authorization is not a completed transaction
     * at this state - the buyer still needs an additional step to finalize
     * the transaction.
     *
     * Build a second API request to PayPal, using the token as the
     * ID to get the details on the payment authorization
     */
    $nvpstr = "&TOKEN=".$token;

    /**
     * Make the API call and store the results in an array.
     * If the call was a success, show the authorization details, and provide
     * an action to complete the payment.
     * If failed, show the error.
     */
    $resArray = hash_call("GetExpressCheckoutDetails", $nvpstr);
    $ack = strtoupper($resArray["ACK"]);
    if ($ack == "SUCCESS" || $ack == "SUCCESSWITHWARNING") {
        $_SESSION['payer_id'] = $resArray['PAYERID'];
    }

    return $resArray;
}

/**
 * Purpose:    Prepares the parameters for the GetExpressCheckoutDetails API Call.
 * Inputs:
 * sBNCode:    The BN code used by PayPal to track the transactions from a given shopping cart.
 * Returns:
 *        The NVP Collection object of the GetExpressCheckoutDetails Call Response.
 */
function ConfirmPayment($FinalPaymentAmt)
{
    /**
     * Gather the information to make the final call to
     * finalize the PayPal payment.  The variable nvpstr
     * holds the name value pairs.
     */

    //Format the other parameters that were stored in the session from the previous calls

    $token = urlencode($_SESSION['TOKEN']);
    $paymentType = urlencode($_SESSION['PaymentType']);
    $currencyCodeType = urlencode($_SESSION['currencyCodeType']);
    $payerID = urlencode($_SESSION['payer_id']);
    $serverName = urlencode($_SERVER['SERVER_NAME']);

    $nvpstr =
        '&TOKEN='.$token.'&PAYERID='.$payerID.'&PAYMENTREQUEST_0_PAYMENTACTION='.$paymentType.'&PAYMENTREQUEST_0_AMT='
        .$FinalPaymentAmt;
    $nvpstr .= '&PAYMENTREQUEST_0_CURRENCYCODE='.$currencyCodeType.'&IPADDRESS='.$serverName;
    $nvpstr = '&'.http_build_query([
            'TOKEN' => $token,
            'PAYERID' => $payerID,
            'PAYMENTACTION' => $paymentType,
            'PAYMENTREQUEST_0_AMT' => $FinalPaymentAmt,
            'PAYMENTREQUEST_0_CURRENCYCODE' => $currencyCodeType,
            'IPADDRESS' => $serverName,
            'paymentactionspecified' => 'true',
        ]);

    /**
     * Make the call to PayPal to finalize payment
     * If an error occured, show the resulting errors.
     */
    $resArray = hash_call("DoExpressCheckoutPayment", $nvpstr);

    /**
     * Display the API response back to the browser.
     * If the response from PayPal was a success, display the response parameters
     * If the response was an error, display the errors received using APIError.php.
     */
    $ack = strtoupper($resArray["ACK"]);

    return $resArray;
}

/**
 * Purpose:    This function makes a DoDirectPayment API call
 * Inputs:
 *        paymentType:        paymentType has to be one of the following values: Sale or Order or Authorization
 *        paymentAmount:    total value of the shopping cart
 *        currencyCode:        currency code value the PayPal API
 *        firstName:            first name as it appears on credit card
 *        lastName:            last name as it appears on credit card
 *        street:                buyer's street address line as it appears on credit card
 *        city:                buyer's city
 *        state:                buyer's state
 *        countryCode:        buyer's country code
 *        zip:                buyer's zip
 *        creditCardType:        buyer's credit card type (i.e. Visa, MasterCard ... )
 *        creditCardNumber:    buyers credit card number without any spaces, dashes or any other characters
 *        expDate:            credit card expiration date
 *        cvv2:                Card Verification Value
 * Returns:
 *        The NVP Collection object of the DoDirectPayment Call Response.
 */
function DirectPayment(
    $paymentType,
    $paymentAmount,
    $creditCardType,
    $creditCardNumber,
    $expDate,
    $cvv2,
    $firstName,
    $lastName,
    $street,
    $city,
    $state,
    $zip,
    $countryCode,
    $currencyCode
) {
    //Construct the parameter string that describes DoDirectPayment
    $nvpstr = "&AMT=".$paymentAmount;
    $nvpstr = $nvpstr."&CURRENCYCODE=".$currencyCode;
    $nvpstr = $nvpstr."&PAYMENTACTION=".$paymentType;
    $nvpstr = $nvpstr."&CREDITCARDTYPE=".$creditCardType;
    $nvpstr = $nvpstr."&ACCT=".$creditCardNumber;
    $nvpstr = $nvpstr."&EXPDATE=".$expDate;
    $nvpstr = $nvpstr."&CVV2=".$cvv2;
    $nvpstr = $nvpstr."&FIRSTNAME=".$firstName;
    $nvpstr = $nvpstr."&LASTNAME=".$lastName;
    $nvpstr = $nvpstr."&STREET=".$street;
    $nvpstr = $nvpstr."&CITY=".$city;
    $nvpstr = $nvpstr."&STATE=".$state;
    $nvpstr = $nvpstr."&COUNTRYCODE=".$countryCode;
    $nvpstr = $nvpstr."&IPADDRESS=".$_SERVER['REMOTE_ADDR'];

    $resArray = hash_call("DoDirectPayment", $nvpstr);

    return $resArray;
}

/**
 * Purpose:    This function makes a MassPay API call
 * Inputs:
 *        Beneficiarie:        Array that contains the Beneficiearie paypal account and the payout amount
 *        Currency Code:    The currency Iso code
 * Returns:
 *        The NVP Collection object of the MassPay Call Response.
 */
function MassPayment(array $beneficiaries, $currencyCode)
{
    $nvpstr = "&RECEIVERTYPE=EmailAddress";
    $nvpstr .= "&CURRENCYCODE=".$currencyCode;

    $index = 0;

    foreach ($beneficiaries as $beneficiary) {
        $nvpstr .= "&L_EMAIL".$index."=".$beneficiary['paypal_account'];
        $nvpstr .= "&L_AMT".$index."=".$beneficiary['commission'];
        $index++;
    }

    $resArray = hash_call("MassPay", $nvpstr);

    return $resArray;
}

/**
 * hash_call: Function to perform the API call to PayPal using API signature.
 *
 * @methodName is name of API  method.
 * @nvpStr is nvp string.
 * returns an associtive array containing the response from the server.
 */
function hash_call($methodName, $nvpStr)
{
    //declaring of global variables
    global $API_Endpoint, $version, $API_UserName, $API_Password, $API_Signature;
    global $USE_PROXY, $PROXY_HOST, $PROXY_PORT;
    global $sBNCode;

    //setting the curl parameters.
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $API_Endpoint);
    curl_setopt($ch, CURLOPT_VERBOSE, 1);
    //turning off the server and peer verification(TrustManager Concept).
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_POST, 1);

    //if USE_PROXY constant set to TRUE in Constants.php, then only proxy will be enabled.
    //Set proxy name to PROXY_HOST and port number to PROXY_PORT in constants.php
    if ($USE_PROXY) {
        curl_setopt($ch, CURLOPT_PROXY, $PROXY_HOST.":".$PROXY_PORT);
    }

    //NVPRequest for submitting to server
    $nvpreq = "METHOD=".urlencode($methodName)."&VERSION=".urlencode($version).
        "&PWD=".urlencode($API_Password)."&USER=".urlencode($API_UserName).
        "&SIGNATURE=".urlencode($API_Signature).$nvpStr."&BUTTONSOURCE=".urlencode($sBNCode);

    //setting the nvpreq as POST FIELD to curl
    curl_setopt($ch, CURLOPT_POSTFIELDS, $nvpreq);
    //getting response from server
    $response = curl_exec($ch);
    //converting NVPResponse to an Associative Array
    $nvpResArray = deformatNVP($response);
    $nvpReqArray = deformatNVP($nvpreq);

    $_SESSION['nvpReqArray'] = $nvpReqArray;

    if (curl_errno($ch)) {
        // moving to display page to display curl errors
        $_SESSION['curl_error_no'] = curl_errno($ch);
        $_SESSION['curl_error_msg'] = curl_error($ch);
    //Execute the Error handling module to display errors.
    } else {
        //closing the curl
        curl_close($ch);
    }

    return $nvpResArray;
}

/**
 * Purpose: Redirects to PayPal.com site.
 * Inputs:  NVP string.
 */
function RedirectToPayPal($token)
{
    global $PAYPAL_URL;
    // Redirect to paypal.com here
    $payPalURL = $PAYPAL_URL.$token;
    header("Location: ".$payPalURL);
    exit;
}

/**
 * This function will take NVPString and convert it to an Associative Array and it will decode the response.
 * It is usefull to search for a particular key and displaying arrays.
 *
 * @nvpstr is NVPString.
 * @nvpArray is Associative Array.
 */
function deformatNVP($nvpstr)
{
    $intial = 0;
    $nvpArray = [];

    while (strlen($nvpstr)) {
        //postion of Key
        $keypos = strpos($nvpstr, '=');
        //position of value
        $valuepos = strpos($nvpstr, '&') ? strpos($nvpstr, '&') : strlen($nvpstr);
        /*getting the Key and Value values and storing in a Associative Array*/
        $keyval = substr($nvpstr, $intial, $keypos);
        $valval = substr($nvpstr, $keypos + 1, $valuepos - $keypos - 1);
        //decoding the respose
        $nvpArray[urldecode($keyval)] = urldecode($valval);
        $nvpstr = substr($nvpstr, $valuepos + 1, strlen($nvpstr));
    }

    return $nvpArray;
}