/*!
 *  Effects Plugin - Adds advanced Web Audio API functionality.
 *  
 *  howler.js v2.0.0-beta4
 *  howlerjs.com
 *
 *  (c) 2013-2015, James Simpson of GoldFire Studios
 *  goldfirestudios.com
 *
 *  MIT License
 */

(function() {

  'use strict';

  /** Global Methods **/
  /***************************************************************************/

  /**
   * Add new properties to the core global init.
   * @param  {Function} _super Core global init method.
   * @return {Howl}
   */
  HowlerGlobal.prototype.init = (function(_super) {
    return function() {
      var self = this;

      // Setup default effects properties.
      self._pos = [0, 0, 0];
      self._orientation = [0, 0, -1, 0, 1, 0];
      self._velocity = [0, 0, 0];
      self._listenerAttr = {
        dopplerFactor: 1,
        speedOfSound: 343.3
      };

      // Complete initilization with howler.js core's global init function.
      return _super.call(this, o);
    };
  })(HowlerGlobal.prototype.init);

  /**
   * Get/set the position of the listener in 3D cartesian space. Sounds using
   * 3D position will be relative to the listener's position.
   * @param  {Number} x The x-position of the listener.
   * @param  {Number} y The y-position of the listener.
   * @param  {Number} z The z-position of the listener.
   * @return {Howler/Array}   Self or current listener position.
   */
  HowlerGlobal.prototype.pos = function(x, y, z) {
    var self = this;

    // Stop right here if not using Web Audio.
    if (!self.ctx || !self.ctx.listener) {
      return self;
    }

    // Set the defaults for optional 'y' & 'z'.
    y = (typeof y !== 'number') ? self._pos[1] : y;
    z = (typeof z !== 'number') ? self._pos[2] : z;

    if (typeof x === 'number') {
      self._pos = [x, y, z];
      self.ctx.listener.setPosition(self._pos[0], self._pos[1], self._pos[2]);
    } else {
      return self._pos;
    }

    return self;
  };

  /**
   * Get/set the direction the listener is pointing in the 3D cartesian space.
   * A front and up vector must be provided. The front is the direction the
   * face of the listener is pointing, and up is the direction the top of the
   * listener is pointing. Thus, these values are expected to be at right angles
   * from each other.
   * @param  {Number} x   The x-orientation of the listener.
   * @param  {Number} y   The y-orientation of the listener.
   * @param  {Number} z   The z-orientation of the listener.
   * @param  {Number} xUp The x-orientation of the top of the listener.
   * @param  {Number} yUp The y-orientation of the top of the listener.
   * @param  {Number} zUp The z-orientation of the top of the listener.
   * @return {Howler/Array}     Returns self or the current orientation vectors.
   */
  HowlerGlobal.prototype.orientation = function(x, y, z, xUp, yUp, zUp) {
    var self = this;

    // Stop right here if not using Web Audio.
    if (!self.ctx || !self.ctx.listener) {
      return self;
    }

    // Set the defaults for optional 'y' & 'z'.
    var or = self._orientation;
    y = (typeof y !== 'number') ? or[1] : y;
    z = (typeof z !== 'number') ? or[2] : z;
    xUp = (typeof xUp !== 'number') ? or[3] : xUp;
    yUp = (typeof yUp !== 'number') ? or[4] : yUp;
    zUp = (typeof zUp !== 'number') ? or[5] : zUp;

    if (typeof x === 'number') {
      self._orientation = [x, y, z, xUp, yUp, zUp];
      self.ctx.listener.setOrientation(or[0], or[1], or[2], or[3], or[4], or[5]);
    } else {
      return or;
    }

    return self;
  };

  /**
   * Get/set the velocity vector of the listener. This controls both direction and speed
   * in 3D space, and is combined relative to a sound's velocity to determine how much
   * doppler shift (pitch change) to apply.
   * @param  {Number} x The x-velocity of the listener.
   * @param  {Number} y The y-velocity of the listener.
   * @param  {Number} z The z-velocity of the listener.
   * @return {Howler/Array}   Self or current listener velocity.
   */
  HowlerGlobal.prototype.velocity = function(x, y, z) {
    var self = this;

    // Stop right here if not using Web Audio.
    if (!self.ctx || !self.ctx.listener) {
      return self;
    }

    // Set the defaults for optional 'y' & 'z'.
    y = (typeof y !== 'number') ? self._velocity[1] : y;
    z = (typeof z !== 'number') ? self._velocity[2] : z;

    if (typeof x === 'number') {
      self._velocity = [x, y, z];
      self.ctx.listener.setVelocity(self._velocity[0], self._velocity[1], self._velocity[2]);
    } else {
      return self._velocity;
    }

    return self;
  };

  /**
   * Get/set the audio listener attributes.
   *   Attributes:
   *     dopplerFactor - (`1` by default) Determines the amount of pitch shift from doppler effect.
   *     speedOfSound - (`343.3` by default) Speed of sound used to calculate doppler shift.
   * @param  {Object} o The attributes to set.
   * @return {Howl/Object}   Returns self or current listener attributes.
   */
  HowlerGlobal.prototype.listenerAttr = function(o) {
    var self = this;

    // Stop right here if not using Web Audio.
    if (!self.ctx || !self.ctx.listener) {
      return self;
    }

    var la = self._listenerAttr;
    if (o) {
      // Update the listener attribute values.
      self._listenerAttr = {
        dopplerFactor: typeof o.dopplerFactor !== 'undefined' ? o.dopplerFactor : la.dopplerFactor,
        speedOfSound: typeof o.speedOfSound !== 'undefined' ? o.speedOfSound : la.speedOfSound
      };

      // Apply the new values.
      self.ctx.listener.dopplerFactor = la.dopplerFactor;
      self.ctx.listener.speedOfSound = la.speedOfSound;
    } else {
      return la;
    }

    return self;
  };

  /** Group Methods **/
  /***************************************************************************/

  /**
   * Add new properties to the core init.
   * @param  {Function} _super Core init method.
   * @return {Howl}
   */
  Howl.prototype.init = (function(_super) {
    return function(o) {
      var self = this;

      // Setup user-defined default properties.
      self._orientation = o.orientation || [1, 0, 0];
      self._pos = o.pos || null;
      self._velocity = o.velocity || [0, 0, 0];
      self._pannerAttr = {
        coneInnerAngle: typeof o.coneInnerAngle !== 'undefined' ? o.coneInnerAngle : 360,
        coneOUterAngle: typeof o.coneOUterAngle !== 'undefined' ? o.coneOUterAngle : 360,
        coneOuterGain: typeof o.coneOuterGain !== 'undefined' ? o.coneOuterGain : 0,
        distanceModel: typeof o.distanceModel !== 'undefined' ? o.distanceModel : 'inverse',
        maxDistance: typeof o.maxDistance !== 'undefined' ? o.maxDistance : 10000,
        panningModel: typeof o.panningModel !== 'undefined' ? o.panningModel : 'HRTF',
        refDistance: typeof o.refDistance !== 'undefined' ? o.refDistance : 1,
        rolloffFactor: typeof o.rolloffFactor !== 'undefined' ? o.rolloffFactor : 1
      };

      // Complete initilization with howler.js core's init function.
      return _super.call(this, o);
    };
  })(Howl.prototype.init);

  /**
   * Get/set the 3D spatial position of the audio source for this sound or
   * all in the group. The most common usage is to set the 'x' position for
   * left/right panning. Setting any value higher than 1.0 will begin to
   * decrease the volume of the sound as it moves further away.
   * @param  {Number} x  The x-position of the audio from -1000.0 to 1000.0.
   * @param  {Number} y  The y-position of the audio from -1000.0 to 1000.0.
   * @param  {Number} z  The z-position of the audio from -1000.0 to 1000.0.
   * @param  {Number} id (optional) The sound ID. If none is passed, all in group will be updated.
   * @return {Howl/Array}    Returns self or the current 3D spatial position: [x, y, z].
   */
  Howl.prototype.pos = function(x, y, z, id) {
    var self = this;

    // Stop right here if not using Web Audio.
    if (!self._webAudio) {
      return self;
    }

    // Wait for the sound to play before changing position.
    if (!self._loaded) {
      self.once('play', function() {
        self.pos(x, y, z, id);
      });

      return self;
    }

    // Set the defaults for optional 'y' & 'z'.
    y = (typeof y !== 'number') ? 0 : y;
    z = (typeof z !== 'number') ? -0.5 : z;

    // Setup the group's spatial position if no ID is passed.
    if (typeof id === 'undefined') {
      // Return the group's spatial position if no parameters are passed.
      if (typeof x === 'number') {
        self._pos = [x, y, z];
      } else {
        return self._pos;
      }
    }

    // Change the spatial position of one or all sounds in group.
    var ids = self._getSoundIds(id);
    for (var i=0; i<ids.length; i++) {
      // Get the sound.
      var sound = self._soundById(ids[i]);

      if (sound) {
        if (typeof x === 'number') {
          sound._pos = [x, y, z];

          if (sound._node) {
            // Check if there is a panner setup and create a new one if not.
            if (!sound._panner) {
              setupPanner(sound);
            }

            sound._panner.setPosition(x, y, z);
          }
        } else {
          return sound._pos;
        }
      }
    }

    return self;
  };

  /**
   * Get/set the direction the audio source is pointing in the 3D cartesian coordinate
   * space. Depending on how direction the sound is, based on the `cone` attributes,
   * a sound pointing away from the listener can be quiet or silent.
   * @param  {Number} x  The x-orientation of the source.
   * @param  {Number} y  The y-orientation of the source.
   * @param  {Number} z  The z-orientation of the source.
   * @param  {Number} id (optional) The sound ID. If none is passed, all in group will be updated.
   * @return {Howl/Array}    Returns self or the current 3D spatial orientation: [x, y, z].
   */
  Howl.prototype.orientation = function(x, y, z, id) {
    var self = this;

    // Stop right here if not using Web Audio.
    if (!self._webAudio) {
      return self;
    }

    // Wait for the sound to play before changing orientation.
    if (!self._loaded) {
      self.once('play', function() {
        self.orientation(x, y, z, id);
      });

      return self;
    }

    // Set the defaults for optional 'y' & 'z'.
    y = (typeof y !== 'number') ? self._orientation[1] : y;
    z = (typeof z !== 'number') ? self._orientation[1] : z;

    // Setup the group's spatial orientation if no ID is passed.
    if (typeof id === 'undefined') {
      // Return the group's spatial orientation if no parameters are passed.
      if (typeof x === 'number') {
        self._orientation = [x, y, z];
      } else {
        return self._orientation;
      }
    }

    // Change the spatial orientation of one or all sounds in group.
    var ids = self._getSoundIds(id);
    for (var i=0; i<ids.length; i++) {
      // Get the sound.
      var sound = self._soundById(ids[i]);

      if (sound) {
        if (typeof x === 'number') {
          sound._orientation = [x, y, z];

          if (sound._node) {
            // Check if there is a panner setup and create a new one if not.
            if (!sound._panner) {
              setupPanner(sound);
            }

            sound._panner.setOrientation(x, y, z);
          }
        } else {
          return sound._orientation;
        }
      }
    }

    return self;
  };

  /**
   * Get/set the velocity vector of the audio source or group. This controls both
   * direction and speed in 3D space and is relative to the listener's velocity.
   * The units are meters/second and are independent of position and orientation.
   * @param  {Number} x  The x-velocity of the source.
   * @param  {Number} y  The y-velocity of the source.
   * @param  {Number} z  The z-velocity of the source.
   * @param  {Number} id (optional) The sound ID. If none is passed, all in group will be updated.
   * @return {Howl/Array}    Returns self or the current 3D spatial velocity: [x, y, z].
   */
  Howl.prototype.velocity = function(x, y, z, id) {
    var self = this;

    // Stop right here if not using Web Audio.
    if (!self._webAudio) {
      return self;
    }

    // Wait for the sound to play before changing velocity.
    if (!self._loaded) {
      self.once('play', function() {
        self.velocity(x, y, z, id);
      });

      return self;
    }

    // Set the defaults for optional 'y' & 'z'.
    y = (typeof y !== 'number') ? self._velocity[1] : y;
    z = (typeof z !== 'number') ? self._velocity[1] : z;

    // Setup the group's spatial velocity if no ID is passed.
    if (typeof id === 'undefined') {
      // Return the group's spatial velocity if no parameters are passed.
      if (typeof x === 'number') {
        self._velocity = [x, y, z];
      } else {
        return self._velocity;
      }
    }

    // Change the spatial velocity of one or all sounds in group.
    var ids = self._getSoundIds(id);
    for (var i=0; i<ids.length; i++) {
      // Get the sound.
      var sound = self._soundById(ids[i]);

      if (sound) {
        if (typeof x === 'number') {
          sound._velocity = [x, y, z];

          if (sound._node) {
            // Check if there is a panner setup and create a new one if not.
            if (!sound._panner) {
              setupPanner(sound);
            }

            sound._panner.setVelocity(x, y, z);
          }
        } else {
          return sound._velocity;
        }
      }
    }

    return self;
  };

  /**
   * Get/set the panner node's attributes for a sound or group of sounds.
   * This method can optionall take 0, 1 or 2 arguments.
   *   pannerAttr() -> Returns the group's values.
   *   pannerAttr(id) -> Returns the sound id's values.
   *   pannerAttr(o) -> Set's the values of all sounds in this Howl group.
   *   pannerAttr(o, id) -> Set's the values of passed sound id.
   *
   *   Attributes:
   *     coneInnerAngle - (360 by default) There will be no volume reduction inside this angle.
   *     coneOUterAngle - (360 by default) The volume will be reduced to a constant value of
   *                      `coneOuterGain` outside this angle.
   *     coneOuterGain - (0 by default) The amount of volume reduction outside of `coneOuterAngle`.
   *     distanceModel - ('inverse' by default) Determines algorithm to use to reduce volume as audio moves
   *                      away from listener. Can be `linear`, `inverse` or `exponential.
   *     maxDistance - (10000 by default) Volume won't reduce between source/listener beyond this distance.
   *     panningModel - ('HRTF' by default) Determines which spatialization algorithm is used to position audio.
   *                     Can be `HRTF` or `equalpower`.
   *     refDistance - (1 by default) A reference distance for reducing volume as the source
   *                    moves away from the listener.
   *     rolloffFactor - (1 by default) How quickly the volume reduces as source moves from listener.
   * 
   * @return {Howl/Object} Returns self or current panner attributes.
   */
  Howl.prototype.pannerAttr = function() {
    var self = this;
    var args = arguments;
    var o, id, sound;

    // Stop right here if not using Web Audio.
    if (!self._webAudio) {
      return self;
    }

    // Determine the values based on arguments.
    if (args.length === 0) {
      // Return the group's panner attribute values.
      return self._pannerAttr;
    } else if (args.length === 1) {
      if (typeof args[0] === 'object') {
        o = args[0];

        // Set the grou's panner attribute values.
        if (typeof id === 'undefined') {
          self._pannerAttr = {
            coneInnerAngle: typeof o.coneInnerAngle !== 'undefined' ? o.coneInnerAngle : self._coneInnerAngle,
            coneOUterAngle: typeof o.coneOUterAngle !== 'undefined' ? o.coneOUterAngle : self._coneOUterAngle,
            coneOuterGain: typeof o.coneOuterGain !== 'undefined' ? o.coneOuterGain : self._coneOuterGain,
            distanceModel: typeof o.distanceModel !== 'undefined' ? o.distanceModel : self._distanceModel,
            maxDistance: typeof o.maxDistance !== 'undefined' ? o.maxDistance : self._maxDistance,
            panningModel: typeof o.panningModel !== 'undefined' ? o.panningModel : self._panningModel,
            refDistance: typeof o.refDistance !== 'undefined' ? o.refDistance : self._refDistance,
            rolloffFactor: typeof o.rolloffFactor !== 'undefined' ? o.rolloffFactor : self._rolloffFactor
          };
        }
      } else {
        // Return this sound's panner attribute values.
        sound = self._soundById(parseInt(args[0], 10));
        return sound ? sound._pannerAttr : self._pannerAttr;
      }
    } else if (args.length === 2) {
      o = args[0];
      id = parseInt(args[1], 10);
    }

    // Update the values of the specified sounds.
    var ids = self._getSoundIds(id);
    for (var i=0; i<ids.length; i++) {
      sound = self._soundById(ids[i]);

      if (sound) {
        // Merge the new values into the sound.
        var pa = sound._pannerAttr;
        pa = {
          coneInnerAngle: typeof o.coneInnerAngle !== 'undefined' ? o.coneInnerAngle : pa.coneInnerAngle,
          coneOUterAngle: typeof o.coneOUterAngle !== 'undefined' ? o.coneOUterAngle : pa.coneOUterAngle,
          coneOuterGain: typeof o.coneOuterGain !== 'undefined' ? o.coneOuterGain : pa.coneOuterGain,
          distanceModel: typeof o.distanceModel !== 'undefined' ? o.distanceModel : pa.distanceModel,
          maxDistance: typeof o.maxDistance !== 'undefined' ? o.maxDistance : pa.maxDistance,
          panningModel: typeof o.panningModel !== 'undefined' ? o.panningModel : pa.panningModel,
          refDistance: typeof o.refDistance !== 'undefined' ? o.refDistance : pa.refDistance,
          rolloffFactor: typeof o.rolloffFactor !== 'undefined' ? o.rolloffFactor : pa.rolloffFactor
        };

        // Update the panner values or create a new panner if none exists.
        var panner = sound._panner;
        if (panner) {
          panner.coneInnerAngle = pa.coneInnerAngle;
          panner.coneOUterAngle = pa.coneOUterAngle;
          panner.coneOuterGain = pa.coneOuterGain;
          panner.distanceModel = pa.distanceModel;
          panner.maxDistance = pa.maxDistance;
          panner.panningModel = pa.panningModel;
          panner.refDistance = pa.refDistance;
          panner.rolloffFactor = pa.rolloffFactor;
        } else {
          // Make sure we have a position to setup the node with.
          if (!sound._pos) {
            sound._pos = self._pos || [0, 0, -0.5];
          }

          // Create a new panner node.
          setupPanner(sound);
        }
      }
    }

    return self;
  };

  /** Single Sound Methods **/
  /***************************************************************************/

  /**
   * Add new properties to the core Sound init.
   * @param  {Function} _super Core Sound init method.
   * @return {Sound}
   */
  Sound.prototype.init = (function(_super) {
    return function() {
      var self = this;
      var parent = self._parent;

      // Setup user-defined default properties.
      self._orientation = parent._orientation;
      self._pos = parent._pos;
      self._velocity = parent._velocity;
      self._pannerAttr = parent._pannerAttr;

      // Complete initilization with howler.js core Sound's init function.
      _super.call(this);

      // If a position was specified, set it up.
      if (self._pos) {
        parent.pos(self._pos[0], self._pos[1], self._pos[2], self._id);
      }
    };
  })(Sound.prototype.init);

  /**
   * Override the Sound.reset method to clean up properties from the effects plugin.
   * @param  {Function} _super Sound reset method.
   * @return {Sound}
   */
  Sound.prototype.reset = (function(_super) {
    return function() {
      var self = this;
      var parent = self._parent;

      // Reset all effects module properties on this sound.
      self._orientation = parent._orientation;
      self._pos = parent._pos;
      self._velocity = parent._velocity;
      self._pannerAttr = parent._pannerAttr;

      // Complete resetting of the sound.
      return _super.call(this);
    };
  })(Sound.prototype.reset);

  /** Helper Methods **/
  /***************************************************************************/

  /**
   * Create a new panner node and save it on the sound.
   * @param  {Sound} sound Specific sound to setup panning on.
   */
  var setupPanner = function(sound) {
    // Create the new panner node.
    sound._panner = Howler.ctx.createPanner();
    sound._panner.coneInnerAngle = sound._pannerAttr.coneInnerAngle;
    sound._panner.coneOUterAngle = sound._pannerAttr.coneOUterAngle;
    sound._panner.coneOuterGain = sound._pannerAttr.coneOuterGain;
    sound._panner.distanceModel = sound._pannerAttr.distanceModel;
    sound._panner.maxDistance = sound._pannerAttr.maxDistance;
    sound._panner.panningModel = sound._pannerAttr.panningModel;
    sound._panner.refDistance = sound._pannerAttr.refDistance;
    sound._panner.rolloffFactor = sound._pannerAttr.rolloffFactor;
    sound._panner.setPosition(sound._pos[0], sound._pos[1], sound._pos[2]);
    sound._panner.setOrientation(sound._orientation[0], sound._orientation[1], sound._orientation[2]);
    sound._panner.setVelocity(sound._velocity[0], sound._velocity[1], sound._velocity[2]);
    sound._panner.connect(sound._node);

    // Update the connections.
    if (!sound._paused) {
      sound._parent.pause(sound._id).play(sound._id);
    }
  };
})();