<?php

final class ManiphestExportController extends ManiphestController {

  private $key;

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

  /**
   * @phutil-external-symbol class PHPExcel
   * @phutil-external-symbol class PHPExcel_IOFactory
   * @phutil-external-symbol class PHPExcel_Style_NumberFormat
   * @phutil-external-symbol class PHPExcel_Cell_DataType
   */
  public function processRequest() {
    $request = $this->getRequest();
    $user = $request->getUser();

    $ok = @include_once 'PHPExcel.php';
    if (!$ok) {
      $dialog = new AphrontDialogView();
      $dialog->setUser($user);

      $inst1 = pht(
        'This system does not have PHPExcel installed. This software '.
        'component is required to export tasks to Excel. Have your system '.
        'administrator install it from:');

      $inst2 = pht(
        'Your PHP "%s" needs to be updated to include the '.
        'PHPExcel Classes directory.',
        'include_path');

      $dialog->setTitle(pht('Excel Export Not Configured'));
      $dialog->appendChild(hsprintf(
        '<p>%s</p>'.
        '<br />'.
        '<p>'.
          '<a href="http://www.phpexcel.net/">http://www.phpexcel.net/</a>'.
        '</p>'.
        '<br />'.
        '<p>%s</p>',
        $inst1,
        $inst2));

      $dialog->addCancelButton('/maniphest/');
      return id(new AphrontDialogResponse())->setDialog($dialog);
    }

    // TODO: PHPExcel has a dependency on the PHP zip extension. We should test
    // for that here, since it fatals if we don't have the ZipArchive class.

    $saved = id(new PhabricatorSavedQueryQuery())
      ->setViewer($user)
      ->withQueryKeys(array($this->key))
      ->executeOne();
    if (!$saved) {
      $engine = id(new ManiphestTaskSearchEngine())
        ->setViewer($user);
      if ($engine->isBuiltinQuery($this->key)) {
        $saved = $engine->buildSavedQueryFromBuiltin($this->key);
      }
      if (!$saved) {
        return new Aphront404Response();
      }
    }

    $formats = ManiphestExcelFormat::loadAllFormats();
    $export_formats = array();
    foreach ($formats as $format_class => $format_object) {
      $export_formats[$format_class] = $format_object->getName();
    }

    if (!$request->isDialogFormPost()) {
      $dialog = new AphrontDialogView();
      $dialog->setUser($user);

      $dialog->setTitle(pht('Export Tasks to Excel'));
      $dialog->appendChild(
        phutil_tag(
          'p',
          array(),
          pht('Do you want to export the query results to Excel?')));

      $form = id(new PHUIFormLayoutView())
        ->appendChild(
          id(new AphrontFormSelectControl())
            ->setLabel(pht('Format:'))
            ->setName('excel-format')
            ->setOptions($export_formats));

      $dialog->appendChild($form);

      $dialog->addCancelButton('/maniphest/');
      $dialog->addSubmitButton(pht('Export to Excel'));
      return id(new AphrontDialogResponse())->setDialog($dialog);
    }

    $format = idx($formats, $request->getStr('excel-format'));
    if ($format === null) {
      throw new Exception(pht('Excel format object not found.'));
    }

    $saved->makeEphemeral();
    $saved->setParameter('limit', PHP_INT_MAX);

    $engine = id(new ManiphestTaskSearchEngine())
      ->setViewer($user);

    $query = $engine->buildQueryFromSavedQuery($saved);
    $query->setViewer($user);
    $tasks = $query->execute();

    $all_projects = array_mergev(mpull($tasks, 'getProjectPHIDs'));
    $all_assigned = mpull($tasks, 'getOwnerPHID');

    $handles = id(new PhabricatorHandleQuery())
      ->setViewer($user)
      ->withPHIDs(array_merge($all_projects, $all_assigned))
      ->execute();

    $workbook = new PHPExcel();
    $format->buildWorkbook($workbook, $tasks, $handles, $user);
    $writer = PHPExcel_IOFactory::createWriter($workbook, 'Excel2007');

    ob_start();
    $writer->save('php://output');
    $data = ob_get_clean();

    $mime = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';

    return id(new AphrontFileResponse())
      ->setMimeType($mime)
      ->setDownload($format->getFileName().'.xlsx')
      ->setContent($data);
  }

}