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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

// Copyright (c) Microsoft. All rights reserved. Licensed under the MIT license. See LICENSE file in the project root for full license information.
var extension = require('./toc.extension.js')

exports.transform = function (model) {

  if (extension && extension.preTransform) {
    model = extension.preTransform(model);
  }

  transformItem(model, 1);
  if (model.items && model.items.length > 0) model.leaf = false;
  model.title = "Table of Content";
  model._disableToc = true;

  if (extension && extension.postTransform) {
    model = extension.postTransform(model);
  }

  return model;

  function transformItem(item, level) {
    // set to null incase mustache looks up
    item.topicHref = item.topicHref || null;
    item.tocHref = item.tocHref || null;
    item.name = item.name || null;

    item.level = level;
    if (item.items && item.items.length > 0) {
      var length = item.items.length;
      for (var i = 0; i < length; i++) {
        transformItem(item.items[i], level + 1);
      };
    } else {
      item.items = [];
      item.leaf = true;
    }
  }
}
