/*
 * Copyright (c) 2016 Hewlett Packard Enterprise Development Company, LP
 *
 * 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.
 */

'use strict';

function buildMockGenerator (config, mockAnswers, mockOptions) {
  var configDefaults = {};
  var memFs = require('mem-fs');
  var editor = require('mem-fs-editor');
  var store = memFs.create();

  config = config || {};
  mockAnswers = mockAnswers || {};
  mockOptions = mockOptions || {};

  return {
    fs: editor.create(store),
    appname: 'generator-openstack',
    async: function () {
      return function () {
      };
    },
    config: {
      defaults: function (values) {
        Object.keys(values).forEach(function (key) {
          configDefaults[key] = values[key];
        });
      },
      get: function (value) {
        return config[value] || configDefaults[value];
      },
      set: function (key, value) {
        if (typeof key === 'object') {
          Object.keys(key).forEach(function (index) {
            config[index] = key[index];
          });
        } else {
          config[key] = value;
        }
      }
    },
    prompt: function (params, callback) {
      var answers = {};
      params.forEach(function (param) {

        if (param.when && !param.when(answers)) {
          return;
        }

        if (mockAnswers.hasOwnProperty(param.name)) {
          answers[param.name] = mockAnswers[param.name];
        } else {
          answers[param.name] = param.default || null;
        }

      });
      callback(answers);
    },
    options: mockOptions
  };
}

module.exports = {
  buildGenerator: buildMockGenerator
};