/*
 * HexGL
 * @author Thibaut 'BKcore' Despoulain <http://bkcore.com>
 * @license This work is licensed under the Creative Commons Attribution-NonCommercial 3.0 Unported License. 
 *          To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/3.0/.
 */

var bkcore = bkcore || {};
bkcore.hexgl = bkcore.hexgl || {};

bkcore.hexgl.RaceData = function(track, mode, shipControls)
{
	this.track = track;
	this.mode = mode;
	this.shipControls = shipControls;

	this.rate = 2; // 1 / rate
	this.rateState = 1;

	this.data = [];
	this.last = -1;
	this.seek = 0;

	this._p = new THREE.Vector3();
	this._pp = new THREE.Vector3();
	this._np = new THREE.Vector3();
	this._q = new THREE.Quaternion();
	this._pq = new THREE.Quaternion();
	this._nq = new THREE.Quaternion();
}

bkcore.hexgl.RaceData.prototype.tick = function(time)
{
	if(this.rateState == 1)
	{
		var p = this.shipControls.getPosition();
		var q = this.shipControls.getQuaternion();
		this.data.push([
			time,
			p.x, p.y, p.z,
			q.x, q.y, q.z, q.w
		]);
		++this.last;
	}
	else if(this.rateState == this.rate)
	{
		this.rateState = 0;
	}
	
	this.rate++;
}

bkcore.hexgl.RaceData.prototype.applyInterpolated = function(time)
{
	while(this.seek < this.last && this.data[this.seek+1][0] < time)
		++this.seek;

	var prev = this.data[this.seek];
	this._pp.set(prev[1], prev[2], prev[3]);
	this._pq.set(prev[4], prev[5], prev[6], prev[7]);

	if(this.seek < 0)
	{
		console.warn('Bad race data.');
		return;
	}

	// no interpolation
	if(this.seek == this.last || this.seek == 0)
		this.shipControls.teleport(this._pp, this._pq);

	// interpolation
	var next = this.data[this.seek+1];
	this._np.set(next[1], next[2], next[3]);
	this._nq.set(next[4], next[5], next[6], next[7]);

	var t = (time-prev[0]) / (next[0]-prev[0]);
	this._p.copy(this._pp).lerpSelf(this._np, t);
	this._q.copy(this._pq).slerpSelf(this._nq, t);
	
	this.shipControls.teleport(this._p, this._q);
}

bkcore.hexgl.RaceData.prototype.reset = function()
{
	this.seek = 0;
}

bkcore.hexgl.RaceData.prototype.export = function()
{
	return this.data;
}

bkcore.hexgl.RaceData.prototype.import = function(imp)
{
	this.data = imp;
	this.last = this.data.length-1;
	console.log(this.data);
}