<?php

/*
 * Copyright 2011 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

class DiffusionDiffController extends DiffusionController {

  public function willProcessRequest(array $data) {
    $request = $this->getRequest();
    if ($request->getStr('id')) {
      $parts = explode(';', $request->getStr('id'));
      $data['path'] = idx($parts, 0);
      $data['commit'] = idx($parts, 1);
    }

    $this->diffusionRequest = DiffusionRequest::newFromAphrontRequestDictionary(
      $data);
  }

  public function processRequest() {
    $drequest = $this->getDiffusionRequest();
    $request = $this->getRequest();

    $diff_query = DiffusionDiffQuery::newFromDiffusionRequest($drequest);
    $changeset = $diff_query->loadChangeset();

    if (!$changeset) {
      return new Aphront404Response();
    }

    $parser = new DifferentialChangesetParser();
    $parser->setChangeset($changeset);
    $parser->setWhitespaceMode(
      DifferentialChangesetParser::WHITESPACE_SHOW_ALL);

    $range_s = null;
    $range_e = null;
    $mask = array();

    // TODO: This duplicates a block in DifferentialChangesetViewController.
    $range = $request->getStr('range');
    if ($range) {
      $match = null;
      if (preg_match('@^(\d+)-(\d+)(?:/(\d+)-(\d+))?$@', $range, $match)) {
        $range_s = (int)$match[1];
        $range_e = (int)$match[2];
        if (count($match) > 3) {
          $start = (int)$match[3];
          $len = (int)$match[4];
          for ($ii = $start; $ii < $start + $len; $ii++) {
            $mask[$ii] = true;
          }
        }
      }
    }

    $output = $parser->render($range_s, $range_e, $mask);

    return id(new AphrontAjaxResponse())
      ->setContent($output);
  }
}