<?php

final class PhabricatorApplicationTransactionCommentEditController
  extends PhabricatorApplicationTransactionController {

  private $phid;

  public function willProcessRequest(array $data) {
    $this->phid = $data['phid'];
  }

  public function processRequest() {
    $request = $this->getRequest();
    $user = $request->getUser();

    $xactions = id(new PhabricatorObjectHandleData(array($this->phid)))
      ->setViewer($user)
      ->loadObjects();
    $xaction = idx($xactions, $this->phid);

    if (!$xaction) {
      // TODO: This may also mean you don't have permission to edit the object,
      // but we can't make that distinction via PhabricatorObjectHandleData
      // at the moment.
      return new Aphront404Response();
    }

    if (!$xaction->getComment()) {
      // You can't currently edit a transaction which doesn't have a comment.
      // Some day you may be able to edit the visibility.
      return new Aphront404Response();
    }

    $obj_phid = $xaction->getObjectPHID();
    $obj_handle = PhabricatorObjectHandleData::loadOneHandle($obj_phid, $user);
    if (!$obj_handle) {
      // Require the corresponding object exist and be visible to the user.
      return new Aphront404Response();
    }

    if ($request->isDialogFormPost()) {
      $text = $request->getStr('text');

      $comment = $xaction->getApplicationTransactionCommentObject();
      $comment->setContent($text);
      if (!strlen($text)) {
        $comment->setIsDeleted(true);
      }

      $editor = id(new PhabricatorApplicationTransactionCommentEditor())
        ->setActor($user)
        ->setContentSourceFromRequest($request)
        ->applyEdit($xaction, $comment);

      if ($request->isAjax()) {
        return id(new PhabricatorApplicationTransactionResponse())
          ->setViewer($user)
          ->setTransactions(array($xaction))
          ->setAnchorOffset($request->getStr('anchor'));
      } else {
        return id(new AphrontReloadResponse())->setURI($obj_handle->getURI());
      }
    }

    $dialog = id(new AphrontDialogView())
      ->setUser($user)
      ->setTitle(pht('Edit Comment'));

    $dialog
      ->addHiddenInput('anchor', $request->getStr('anchor'))
      ->appendChild(
        id(new PhabricatorRemarkupControl())
          ->setName('text')
          ->setValue($xaction->getComment()->getContent()));

    $dialog
      ->addSubmitButton(pht('Edit Comment'))
      ->addCancelButton($obj_handle->getURI());

    return id(new AphrontDialogResponse())->setDialog($dialog);
  }

}