//
//  Maraca.js
//  
//  Created by Philip Rosedale on May 9, 2016
//  Copyright 2016 High Fidelity, Inc.
//
//  reates a maraca sound when shaken 
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

function Timer() {
	var time; 
 	var count = 0;
	var totalTime = 0;
	this.reset = function() {
		count = 0;
		totalTime = 0;
 	}
	this.start = function() {
		time = new Date().getTime();
	}
	this.record = function() {
		var elapsed =  new Date().getTime() - time;
		totalTime += elapsed;
		count++;
		return elapsed;
	}
	this.count = function() {
 		return count;
 	}
 	this.average = function() {
 		return (count == 0) ? 0 : totalTime / count;
	}
 	this.elapsed = function() {
 		return new Date().getTime() - time;
 	}
}

(function () {
 	var entityID,
	wantDebug = true,
	timer = new Timer(),
	playTimer = new Timer(),
	TRIGGER_SPEED = 0.06,
	moving = false,
	RED = { red: 255, green: 0, blue: 0 },
	GRAY = { red: 128, green: 128, blue: 128 },
	averageVelocity = { x: 0, y: 0, z: 0 },
	VELOCITY_AVERAGE_RATE = 0.5,
	VOLUME = 2.0,
	MIN_TIME_BETWEEN_SOUNDS = 0.1,
	soundUp = SoundCache.getSound("https://s3.amazonaws.com/hifi-public/philip/maraca.wav"),
	soundDown = SoundCache.getSound("https://s3.amazonaws.com/hifi-public/philip/maraca3.wav")

	function printDebug(message) {
		if (wantDebug) {
			print(message);
	     }
	}

	function maybePlaySound() { 

		var deltaTime = timer.elapsed() / 1000.0;
		if (deltaTime == 0.0) {
			return;
		}

		properties = Entities.getEntityProperties(entityID);

		//  Compute the pseudoAcceleration of the object as the instantaneous speed dotted with its own history
		var relativeSpeed = Vec3.dot(properties.velocity, averageVelocity);
   		var speed = Vec3.length(properties.velocity);
		
  		if (relativeSpeed > TRIGGER_SPEED) {
  			moving = true;
  			Entities.editEntity(entityID, { color: GRAY });
  		}
  		if (moving && (relativeSpeed < TRIGGER_SPEED)) {
  			moving = false;
  			var volume = Math.min(Vec3.length(averageVelocity) * VOLUME, 1.0);
  			if (playTimer.elapsed() / 1000 > MIN_TIME_BETWEEN_SOUNDS) {
  				Entities.editEntity(entityID, { color: RED });
  				var up = Vec3.dot(averageVelocity, { x: 0, y: 1, z: 0 });
  				Audio.playSound( up > 0 ? soundUp : soundDown, {
                           			position: properties.position,
                                    volume: volume,
                                    loop: false } );
  				
  				
  				playTimer.start();
  			}
  		}
  		averageVelocity = Vec3.sum( Vec3.multiply(VELOCITY_AVERAGE_RATE, properties.velocity), 
									Vec3.multiply(1.0 - VELOCITY_AVERAGE_RATE, averageVelocity) );
		timer.start();
	}
 
 	this.startNearGrab = function() { 
 		timer.start();
 		playTimer.start();
	}

	this.continueNearGrab = function() {
 	  	//  Check object velocity 
		maybePlaySound();
 	}

	this.releaseGrab = function() { 
		printDebug("released maraca..."); 
	}
 
 	this.preload = function (givenEntityID) {
 		printDebug("load maraca...");
		entityID = givenEntityID;
	};
 
 	this.unload = function () {
 		printDebug("Unload maraca...");
	};

});