<?php

final class DiffusionRepositoryEditEncodingController
  extends DiffusionRepositoryEditController {

  public function handleRequest(AphrontRequest $request) {
    $response = $this->loadDiffusionContextForEdit();
    if ($response) {
      return $response;
    }

    $user = $this->getViewer();
    $drequest = $this->getDiffusionRequest();
    $repository = $drequest->getRepository();

    $edit_uri = $this->getRepositoryControllerURI($repository, 'edit/');

    $v_encoding = $repository->getDetail('encoding');
    $e_encoding = null;
    $errors = array();

    if ($request->isFormPost()) {
      $v_encoding = $request->getStr('encoding');

      if (!$errors) {
        $xactions = array();
        $template = id(new PhabricatorRepositoryTransaction());

        $type_encoding = PhabricatorRepositoryTransaction::TYPE_ENCODING;

        $xactions[] = id(clone $template)
          ->setTransactionType($type_encoding)
          ->setNewValue($v_encoding);

        try {
          id(new PhabricatorRepositoryEditor())
            ->setContinueOnNoEffect(true)
            ->setContentSourceFromRequest($request)
            ->setActor($user)
            ->applyTransactions($repository, $xactions);

          return id(new AphrontRedirectResponse())->setURI($edit_uri);
        } catch (Exception $ex) {
          $errors[] = $ex->getMessage();
        }
      }
    }

    $crumbs = $this->buildApplicationCrumbs();
    $crumbs->addTextCrumb(pht('Edit Encoding'));

    $title = pht('Edit %s', $repository->getName());

    $form = id(new AphrontFormView())
      ->setUser($user)
      ->appendRemarkupInstructions($this->getEncodingInstructions())
      ->appendChild(
        id(new AphrontFormTextControl())
          ->setName('encoding')
          ->setLabel(pht('Text Encoding'))
          ->setValue($v_encoding)
          ->setError($e_encoding))
      ->appendChild(
        id(new AphrontFormSubmitControl())
          ->setValue(pht('Save Encoding'))
          ->addCancelButton($edit_uri));

    $object_box = id(new PHUIObjectBoxView())
      ->setHeaderText($title)
      ->setForm($form)
      ->setFormErrors($errors);

    return $this->newPage()
      ->setTitle($title)
      ->setCrumbs($crumbs)
      ->appendChild($object_box);
  }

  private function getEncodingInstructions() {
    return pht(<<<EOT
If source code in this repository uses a character encoding other than UTF-8
(for example, `ISO-8859-1`), specify it here.

**Normally, you can leave this field blank.** If your source code is written in
ASCII or UTF-8, everything will work correctly.

Source files will be translated from the specified encoding to UTF-8 when they
are read from the repository, before they are displayed in Diffusion.

See [[%s | UTF-8 and Character Encoding]] for more information on how
Phabricator handles text encodings.
EOT
    ,
    PhabricatorEnv::getDoclink('User Guide: UTF-8 and Character Encoding'));
  }

}