/*
 * Copyright 2016 Google Inc. All Rights Reserved.
 * 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.
 */

var Util = require('../util');

var CAMEL_TO_UNDERSCORE = {
  video: 'video',
  image: 'image',
  preview: 'preview',
  loop: 'loop',
  volume: 'volume',
  muted: 'muted',
  isStereo: 'is_stereo',
  defaultYaw: 'default_yaw',
  isYawOnly: 'is_yaw_only',
  isDebug: 'is_debug',
  isVROff: 'is_vr_off',
  isAutopanOff: 'is_autopan_off',
  hideFullscreenButton: 'hide_fullscreen_button'
};

/**
 * Contains all information about a given scene.
 */
function SceneInfo(opt_params) {
  var params = opt_params || {};
  params.player = {
    loop: opt_params.loop,
    volume: opt_params.volume,
    muted: opt_params.muted
  };

  this.image = params.image !== undefined ? encodeURI(params.image) : undefined;
  this.preview = params.preview !== undefined ? encodeURI(params.preview) : undefined;
  this.video = params.video !== undefined ? encodeURI(params.video) : undefined;
  this.defaultYaw = THREE.Math.degToRad(params.defaultYaw || 0);

  this.isStereo = Util.parseBoolean(params.isStereo);
  this.isYawOnly = Util.parseBoolean(params.isYawOnly);
  this.isDebug = Util.parseBoolean(params.isDebug);
  this.isVROff = Util.parseBoolean(params.isVROff);
  this.isAutopanOff = Util.parseBoolean(params.isAutopanOff);
  this.loop = Util.parseBoolean(params.player.loop);
  this.volume = parseFloat(
      params.player.volume ? params.player.volume : '1');
  this.muted = Util.parseBoolean(params.player.muted);
  this.hideFullscreenButton = Util.parseBoolean(params.hideFullscreenButton);
}

SceneInfo.loadFromGetParams = function() {
  var params = {};
  for (var camelCase in CAMEL_TO_UNDERSCORE) {
    var underscore = CAMEL_TO_UNDERSCORE[camelCase];
    params[camelCase] = Util.getQueryParameter(underscore)
                        || ((window.WebVRConfig && window.WebVRConfig.PLAYER) ? window.WebVRConfig.PLAYER[underscore] : "");
  }
  var scene = new SceneInfo(params);
  if (!scene.isValid()) {
    console.warn('Invalid scene: %s', scene.errorMessage);
  }
  return scene;
};

SceneInfo.loadFromAPIParams = function(underscoreParams) {
  var params = {};
  for (var camelCase in CAMEL_TO_UNDERSCORE) {
    var underscore = CAMEL_TO_UNDERSCORE[camelCase];
    if (underscoreParams[underscore]) {
      params[camelCase] = underscoreParams[underscore];
    }
  }
  var scene = new SceneInfo(params);
  if (!scene.isValid()) {
    console.warn('Invalid scene: %s', scene.errorMessage);
  }
  return scene;
};

SceneInfo.prototype.isValid = function() {
  // Either it's an image or a video.
  if (!this.image && !this.video) {
    this.errorMessage = 'Either image or video URL must be specified.';
    return false;
  }
  if (this.image && !this.isValidImage_(this.image)) {
    this.errorMessage = 'Invalid image URL: ' + this.image;
    return false;
  }
  this.errorMessage = null;
  return true;
};

/**
 * Generates a URL to reflect this scene.
 */
SceneInfo.prototype.getCurrentUrl = function() {
  var url = location.protocol + '//' + location.host + location.pathname + '?';
  for (var camelCase in CAMEL_TO_UNDERSCORE) {
    var underscore = CAMEL_TO_UNDERSCORE[camelCase];
    var value = this[camelCase];
    if (value !== undefined) {
      url += underscore + '=' + value + '&';
    }
  }
  // Chop off the trailing ampersand.
  return url.substring(0, url.length - 1);
};

SceneInfo.prototype.isValidImage_ = function(imageUrl) {
  return true;
};

module.exports = SceneInfo;