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 /*
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 * HexGL
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 * @author Thibaut 'BKcore' Despoulain <http://bkcore.com>
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 * @license This work is licensed under the Creative Commons Attribution-NonCommercial 3.0 Unported License. 
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 *          To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/3.0/.
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 */
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var bkcore = bkcore || {};
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bkcore.hexgl = bkcore.hexgl || {};
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bkcore.hexgl.RaceData = function(track, mode, shipControls)
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{
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	this.track = track;
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	this.mode = mode;
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	this.shipControls = shipControls;
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	this.rate = 2; // 1 / rate
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	this.rateState = 1;
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	this.data = [];
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	this.last = -1;
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	this.seek = 0;
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	this._p = new THREE.Vector3();
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	this._pp = new THREE.Vector3();
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	this._np = new THREE.Vector3();
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	this._q = new THREE.Quaternion();
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	this._pq = new THREE.Quaternion();
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	this._nq = new THREE.Quaternion();
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}
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bkcore.hexgl.RaceData.prototype.tick = function(time)
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{
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	if(this.rateState == 1)
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	{
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		var p = this.shipControls.getPosition();
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		var q = this.shipControls.getQuaternion();
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		this.data.push([
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			time,
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			p.x, p.y, p.z,
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			q.x, q.y, q.z, q.w
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		]);
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		++this.last;
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	}
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	else if(this.rateState == this.rate)
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	{
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		this.rateState = 0;
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	}
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	this.rate++;
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}
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bkcore.hexgl.RaceData.prototype.applyInterpolated = function(time)
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{
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	while(this.seek < this.last && this.data[this.seek+1][0] < time)
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		++this.seek;
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	var prev = this.data[this.seek];
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	this._pp.set(prev[1], prev[2], prev[3]);
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	this._pq.set(prev[4], prev[5], prev[6], prev[7]);
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	if(this.seek < 0)
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	{
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		console.warn('Bad race data.');
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		return;
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	}
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	// no interpolation
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	if(this.seek == this.last || this.seek == 0)
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		this.shipControls.teleport(this._pp, this._pq);
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	// interpolation
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	var next = this.data[this.seek+1];
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	this._np.set(next[1], next[2], next[3]);
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	this._nq.set(next[4], next[5], next[6], next[7]);
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	var t = (time-prev[0]) / (next[0]-prev[0]);
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	this._p.copy(this._pp).lerpSelf(this._np, t);
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	this._q.copy(this._pq).slerpSelf(this._nq, t);
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	this.shipControls.teleport(this._p, this._q);
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}
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bkcore.hexgl.RaceData.prototype.reset = function()
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{
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	this.seek = 0;
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}
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bkcore.hexgl.RaceData.prototype.export = function()
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{
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	return this.data;
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}
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bkcore.hexgl.RaceData.prototype.import = function(imp)
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{
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	this.data = imp;
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	this.last = this.data.length-1;
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	console.log(this.data);
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}
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