/*
 * 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 VRDisplay = require('./base.js').VRDisplay;
var HMDVRDevice = require('./base.js').HMDVRDevice;
var PositionSensorVRDevice = require('./base.js').PositionSensorVRDevice;

/**
 * Wraps a VRDisplay and exposes it as a HMDVRDevice
 */
function VRDisplayHMDDevice(display) {
  this.display = display;

  this.hardwareUnitId = display.displayId;
  this.deviceId = 'webvr-polyfill:HMD:' + display.displayId;
  this.deviceName = display.displayName + ' (HMD)';
}
VRDisplayHMDDevice.prototype = new HMDVRDevice();

VRDisplayHMDDevice.prototype.getEyeParameters = function(whichEye) {
  var eyeParameters = this.display.getEyeParameters(whichEye);

  return {
    currentFieldOfView: eyeParameters.fieldOfView,
    maximumFieldOfView: eyeParameters.fieldOfView,
    minimumFieldOfView: eyeParameters.fieldOfView,
    recommendedFieldOfView: eyeParameters.fieldOfView,
    eyeTranslation: { x: eyeParameters.offset[0], y: eyeParameters.offset[1], z: eyeParameters.offset[2] },
    renderRect: {
      x: (whichEye == 'right') ? eyeParameters.renderWidth : 0,
      y: 0,
      width: eyeParameters.renderWidth,
      height: eyeParameters.renderHeight
    }
  };
};

VRDisplayHMDDevice.prototype.setFieldOfView =
    function(opt_fovLeft, opt_fovRight, opt_zNear, opt_zFar) {
  // Not supported. getEyeParameters reports that the min, max, and recommended
  // FoV is all the same, so no adjustment can be made.
};

// TODO: Need to hook requestFullscreen to see if a wrapped VRDisplay was passed
// in as an option. If so we should prevent the default fullscreen behavior and
// call VRDisplay.requestPresent instead.

/**
 * Wraps a VRDisplay and exposes it as a PositionSensorVRDevice
 */
function VRDisplayPositionSensorDevice(display) {
  this.display = display;

  this.hardwareUnitId = display.displayId;
  this.deviceId = 'webvr-polyfill:PositionSensor: ' + display.displayId;
  this.deviceName = display.displayName + ' (PositionSensor)';
}
VRDisplayPositionSensorDevice.prototype = new PositionSensorVRDevice();

VRDisplayPositionSensorDevice.prototype.getState = function() {
  var pose = this.display.getPose();
  return {
    position: pose.position ? { x: pose.position[0], y: pose.position[1], z: pose.position[2] } : null,
    orientation: pose.orientation ? { x: pose.orientation[0], y: pose.orientation[1], z: pose.orientation[2], w: pose.orientation[3] } : null,
    linearVelocity: null,
    linearAcceleration: null,
    angularVelocity: null,
    angularAcceleration: null
  };
};

VRDisplayPositionSensorDevice.prototype.resetState = function() {
  return this.positionDevice.resetPose();
};


module.exports.VRDisplayHMDDevice = VRDisplayHMDDevice;
module.exports.VRDisplayPositionSensorDevice = VRDisplayPositionSensorDevice;