/**
  * Pushes a given task to MobileWorks. The resource is set according
  * to the evalution type.
  * 
  * Expects the evaluation id to be the current active record id.
  * 
  * @param  MobileWorks $mobileWorksApi  A configured mobileWorksApi
  * @return void
  */
 public function pushTask($mobileWorksApi, $redundancy, $workflowType, $blocked_users)
 {
     $this->read(null, $this->id);
     // create the callback url dependend of type value
     if ($this->data['Evaluation']['type'] == Evaluation::$TYPE_ARTICLE_TOPIC) {
         $callback = Configure::read('domain') . '/evaluations/returnstepone/' . $this->data['Evaluation']['id'] . '.json';
     } else {
         $callback = Configure::read('domain') . '/evaluations/returnsteptwo/' . $this->data['Evaluation']['id'] . '.json';
     }
     // create a project (to get an instant callback, we need a new project for every task)
     $p = $mobileWorksApi->Project(array('projectid' => Configure::read('version') . $this->data['Evaluation']['id'], 'webhooks' => $callback));
     $daysSinceCreation = 0;
     $price = $this->getPrice(0);
     //calculate price since initial task
     $now = time();
     $your_date = strtotime($this->data['Evaluation']['created']);
     $datediff = $now - $your_date;
     $daysSinceCreation = floor($datediff / (60 * 60 * 24));
     $price = $this->getPrice($daysSinceCreation);
     // create the tasks
     for ($i = 0; $i < 3; $i++) {
         $t = $mobileWorksApi->Task(array('taskid' => $this->getMWTaskId($i), 'instructions' => $this->data['Evaluation']['question'], 'workflow' => $workflowType, 'blocked' => $blocked_users, 'payment' => $price));
         // build choices
         if ($this->data['Evaluation']['type'] == Evaluation::$TYPE_ARTICLE_TOPIC) {
             $t->add_field('result', 'm', array("choices" => "Yes,No"));
         } else {
             // titlesentiment or paragraphsentiment
             $t->add_field('rating', 'm', array("choices" => "-5 (Very Bad),-4,-3,-2,-1,0 (balanced),1,2,3,4,5 (Very positive)"));
         }
         // add to project
         $p->add_task($t);
     }
     //otherwise reject the task
     if ($daysSinceCreation < 15) {
         // push the project
         $project_url = $p->post();
         // add the task url to the evaluation record
         $this->saveField('task_url', $project_url);
     } else {
         $this->saveField('task_url', "rejected");
     }
 }