<?php

final class WMFLockTaskEventListener extends PhabricatorEventListener {

  public function register() {
    $this->listen(PhabricatorEventType::TYPE_UI_DIDRENDERACTIONS);
  }

  public function handleEvent(PhutilEvent $event) {
    switch ($event->getType()) {
      case PhabricatorEventType::TYPE_UI_DIDRENDERACTIONS:
        $this->handleActionEvent($event);
      break;
    }
  }

  private function handleActionEvent($event) {
    $viewer = $event->getUser();
    $object = $event->getValue('object');

    if (!$object || !($object instanceof ManiphestTask)) {
      return;
    }

    // Figure out if the item will be enabled or disabled in the UI.
    // This assumes any logged-in user can lock tasks (UI item always enabled),
    // but you probably want to test for project membership or something
    // instead.
    $can_lock = $viewer->isLoggedIn();


    // Figure out if the task is already locked, so we can either show
    // "Lock This Task" or "This Task is Already Locked".

    // This should read the custom "Security" field, or the policy, or you
    // can just leave it like this to always shows "Lock This Task" and let
    // users figure it out.
    $is_locked = false;


    // You can't re-lock an already-locked task.
    $can_lock = ($can_lock && !$is_locked);


    if ($is_locked) {
      $lock_name = pht('Already Locked');
    } else {
      $lock_name = pht('Lock Security Issue');
    }

    $lock_action = id(new PhabricatorActionView())
      ->setHref('/wmf-extensions/lock-task/'.$object->getID().'/')
      ->setIcon('fa-lock')
      ->setName($lock_name)
      ->setWorkflow(true)
      ->setDisabled(!$can_lock);

    $actions = $event->getValue('actions');
    $actions[] = $lock_action;
    $event->setValue('actions', $actions);
  }

}