<?php

/**
 * @group phriction
 */
final class PhrictionEditController
  extends PhrictionController {

  private $id;

  public function willProcessRequest(array $data) {
    $this->id = idx($data, 'id');
  }

  public function processRequest() {

    $request = $this->getRequest();
    $user = $request->getUser();

    if ($this->id) {
      $document = id(new PhrictionDocument())->load($this->id);
      if (!$document) {
        return new Aphront404Response();
      }

      $revert = $request->getInt('revert');
      if ($revert) {
        $content = id(new PhrictionContent())->loadOneWhere(
          'documentID = %d AND version = %d',
          $document->getID(),
          $revert);
        if (!$content) {
          return new Aphront404Response();
        }
      } else {
        $content = id(new PhrictionContent())->load($document->getContentID());
      }

    } else {
      $slug = $request->getStr('slug');
      $slug = PhabricatorSlug::normalize($slug);
      if (!$slug) {
        return new Aphront404Response();
      }

      $document = id(new PhrictionDocument())->loadOneWhere(
        'slug = %s',
        $slug);

      if ($document) {
        $content = id(new PhrictionContent())->load($document->getContentID());
      } else {
        if (PhrictionDocument::isProjectSlug($slug)) {
          $project = id(new PhabricatorProjectQuery())
            ->setViewer($user)
            ->withPhrictionSlugs(array(
              PhrictionDocument::getProjectSlugIdentifier($slug)))
            ->executeOne();
          if (!$project) {
            return new Aphront404Response();
          }
        }
        $document = new PhrictionDocument();
        $document->setSlug($slug);

        $content  = new PhrictionContent();
        $content->setSlug($slug);

        $default_title = PhabricatorSlug::getDefaultTitle($slug);
        $content->setTitle($default_title);
      }
    }

    if ($request->getBool('nodraft')) {
      $draft = null;
      $draft_key = null;
    } else {
      if ($document->getPHID()) {
        $draft_key = $document->getPHID().':'.$content->getVersion();
      } else {
        $draft_key = 'phriction:'.$content->getSlug();
      }
      $draft = id(new PhabricatorDraft())->loadOneWhere(
        'authorPHID = %s AND draftKey = %s',
        $user->getPHID(),
        $draft_key);
    }

    require_celerity_resource('phriction-document-css');

    $e_title = true;
    $notes = null;
    $errors = array();

    if ($request->isFormPost()) {
      $title = $request->getStr('title');
      $notes = $request->getStr('description');

      if (!strlen($title)) {
        $e_title = pht('Required');
        $errors[] = pht('Document title is required.');
      } else {
        $e_title = null;
      }

      if ($document->getID()) {
        if ($content->getTitle() == $title &&
            $content->getContent() == $request->getStr('content')) {

          $dialog = new AphrontDialogView();
          $dialog->setUser($user);
          $dialog->setTitle(pht('No Edits'));
          $dialog->appendChild(phutil_tag('p', array(), pht(
            'You did not make any changes to the document.')));
          $dialog->addCancelButton($request->getRequestURI());

          return id(new AphrontDialogResponse())->setDialog($dialog);
        }
      } else if (!strlen($request->getStr('content'))) {

        // We trigger this only for new pages. For existing pages, deleting
        // all the content counts as deleting the page.

        $dialog = new AphrontDialogView();
        $dialog->setUser($user);
        $dialog->setTitle(pht('Empty Page'));
        $dialog->appendChild(phutil_tag('p', array(), pht(
          'You can not create an empty document.')));
        $dialog->addCancelButton($request->getRequestURI());

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

      if (!count($errors)) {
        $editor = id(PhrictionDocumentEditor::newForSlug($document->getSlug()))
          ->setActor($user)
          ->setTitle($title)
          ->setContent($request->getStr('content'))
          ->setDescription($notes);

        $editor->save();

        if ($draft) {
          $draft->delete();
        }

        $uri = PhrictionDocument::getSlugURI($document->getSlug());
        return id(new AphrontRedirectResponse())->setURI($uri);
      }
    }

    $error_view = null;
    if ($errors) {
      $error_view = id(new AphrontErrorView())
        ->setTitle(pht('Form Errors'))
        ->setErrors($errors);
    }

    if ($document->getID()) {
      $panel_header = pht('Edit Phriction Document');
      $submit_button = pht('Save Changes');
    } else {
      $panel_header = pht('Create New Phriction Document');
      $submit_button = pht('Create Document');
    }

    $uri = $document->getSlug();
    $uri = PhrictionDocument::getSlugURI($uri);
    $uri = PhabricatorEnv::getProductionURI($uri);

    $cancel_uri = PhrictionDocument::getSlugURI($document->getSlug());

    if ($draft &&
        strlen($draft->getDraft()) &&
        ($draft->getDraft() != $content->getContent())) {
      $content_text = $draft->getDraft();

      $discard = phutil_tag(
        'a',
        array(
          'href' => $request->getRequestURI()->alter('nodraft', true),
        ),
        pht('discard this draft'));

      $draft_note = new AphrontErrorView();
      $draft_note->setSeverity(AphrontErrorView::SEVERITY_NOTICE);
      $draft_note->setTitle('Recovered Draft');
      $draft_note->appendChild(hsprintf(
        '<p>Showing a saved draft of your edits, you can %s.</p>',
        $discard));
    } else {
      $content_text = $content->getContent();
      $draft_note = null;
    }

    $form = id(new AphrontFormView())
      ->setUser($user)
      ->setWorkflow(true)
      ->setAction($request->getRequestURI()->getPath())
      ->addHiddenInput('slug', $document->getSlug())
      ->addHiddenInput('nodraft', $request->getBool('nodraft'))
      ->appendChild(
        id(new AphrontFormTextControl())
          ->setLabel(pht('Title'))
          ->setValue($content->getTitle())
          ->setError($e_title)
          ->setName('title'))
      ->appendChild(
        id(new AphrontFormStaticControl())
          ->setLabel(pht('URI'))
          ->setValue($uri))
      ->appendChild(
        id(new PhabricatorRemarkupControl())
          ->setLabel(pht('Content'))
          ->setValue($content_text)
          ->setHeight(AphrontFormTextAreaControl::HEIGHT_VERY_TALL)
          ->setName('content')
          ->setID('document-textarea')
          ->setUser($user))
      ->appendChild(
        id(new AphrontFormTextControl())
          ->setLabel(pht('Edit Notes'))
          ->setValue($notes)
          ->setError(null)
          ->setName('description'))
      ->appendChild(
        id(new AphrontFormSubmitControl())
          ->addCancelButton($cancel_uri)
          ->setValue($submit_button));

    $form_box = id(new PHUIObjectBoxView())
      ->setHeaderText(pht('Edit Document'))
      ->setFormError($error_view)
      ->setForm($form);

    $preview = id(new PHUIRemarkupPreviewPanel())
      ->setHeader(pht('Document Preview'))
      ->setPreviewURI('/phriction/preview/')
      ->setControlID('document-textarea')
      ->setSkin('document');

    $crumbs = $this->buildApplicationCrumbs();
    if ($document->getID()) {
      $crumbs->addCrumb(
        id(new PhabricatorCrumbView())
          ->setName($content->getTitle())
          ->setHref(PhrictionDocument::getSlugURI($document->getSlug())));
      $crumbs->addCrumb(
        id(new PhabricatorCrumbView())
          ->setName(pht('Edit')));
    } else {
      $crumbs->addCrumb(
        id(new PhabricatorCrumbView())
          ->setName(pht('Create')));
    }

    return $this->buildApplicationPage(
      array(
        $crumbs,
        $draft_note,
        $form_box,
        $preview,
      ),
      array(
        'title'   => pht('Edit Document'),
        'device'  => true,
      ));
  }

}
