Magento Create Coupon Programatically

Create coupon code programatically

<?php

ini_set('max_execution_time', 600);
ini_set('memory_limit', '1024M');

require 'app/Mage.php';
$app = Mage::app('');

$rule = Mage::getModel('salesrule/rule');
    $customer_groups = array(0, 1, 2, 3);
    $rule->setName(jaga)
      ->setDescription(jaga)
      ->setFromDate('')
      ->setCouponType(2)
      ->setCouponCode('jaga123')
      ->setUsesPerCustomer(1)
      ->setCustomerGroupIds($customer_groups) //an array of customer grou pids
      ->setIsActive(1)
      ->setConditionsSerialized('')
      ->setActionsSerialized('')
      ->setStopRulesProcessing(0)
      ->setIsAdvanced(1)
      ->setProductIds('')
      ->setSortOrder(0)
      ->setSimpleAction('cart_fixed')
      ->setDiscountAmount('5555')
      ->setDiscountQty(null)
      ->setDiscountStep(0)
      ->setSimpleFreeShipping('0')
      ->setApplyToShipping('0')
      ->setIsRss(0)
      ->setWebsiteIds(array(1));


    $rule->save();
?>