jQuery(document).ready(function($) {
	var frameRate = 30;
	var dt = 1.0 / frameRate;
	var DEG_TO_RAD = Math.PI / 180;
	var RAD_TO_DEG = 180 / Math.PI;
	var colors = [
		["#771787", "#239bb9"],
	];

	function Vector2(_x, _y) {
		this.x = _x, this.y = _y;
		this.Length = function() {
			return Math.sqrt(this.SqrLength());
		}
		this.SqrLength = function() {
			return this.x * this.x + this.y * this.y;
		}
		this.Equals = function(_vec0, _vec1) {
			return _vec0.x == _vec1.x && _vec0.y == _vec1.y;
		}
		this.Add = function(_vec) {
			this.x += _vec.x;
			this.y += _vec.y;
		}
		this.Sub = function(_vec) {
			this.x -= _vec.x;
			this.y -= _vec.y;
		}
		this.Div = function(_f) {
			this.x /= _f;
			this.y /= _f;
		}
		this.Mul = function(_f) {
			this.x *= _f;
			this.y *= _f;
		}
		this.Normalize = function() {
			var sqrLen = this.SqrLength();
			if (sqrLen != 0) {
				var factor = 1.0 / Math.sqrt(sqrLen);
				this.x *= factor;
				this.y *= factor;
			}
		}
		this.Normalized = function() {
			var sqrLen = this.SqrLength();
			if (sqrLen != 0) {
				var factor = 1.0 / Math.sqrt(sqrLen);
				return new Vector2(this.x * factor, this.y * factor);
			}
			return new Vector2(0, 0);
		}
	}
	Vector2.Lerp = function(_vec0, _vec1, _t) {
		return new Vector2((_vec1.x - _vec0.x) * _t + _vec0.x, (_vec1.y - _vec0.y) * _t + _vec0.y);
	}
	Vector2.Distance = function(_vec0, _vec1) {
		return Math.sqrt(Vector2.SqrDistance(_vec0, _vec1));
	}
	Vector2.SqrDistance = function(_vec0, _vec1) {
		var x = _vec0.x - _vec1.x;
		var y = _vec0.y - _vec1.y;
		return (x * x + y * y + z * z);
	}
	Vector2.Scale = function(_vec0, _vec1) {
		return new Vector2(_vec0.x * _vec1.x, _vec0.y * _vec1.y);
	}
	Vector2.Min = function(_vec0, _vec1) {
		return new Vector2(Math.min(_vec0.x, _vec1.x), Math.min(_vec0.y, _vec1.y));
	}
	Vector2.Max = function(_vec0, _vec1) {
		return new Vector2(Math.max(_vec0.x, _vec1.x), Math.max(_vec0.y, _vec1.y));
	}
	Vector2.ClampMagnitude = function(_vec0, _len) {
		var vecNorm = _vec0.Normalized;
		return new Vector2(vecNorm.x * _len, vecNorm.y * _len);
	}
	Vector2.Sub = function(_vec0, _vec1) {
		return new Vector2(_vec0.x - _vec1.x, _vec0.y - _vec1.y, _vec0.z - _vec1.z);
	}

	function EulerMass(_x, _y, _mass, _drag) {
		this.position = new Vector2(_x, _y);
		this.mass = _mass;
		this.drag = _drag;
		this.force = new Vector2(0, 0);
		this.velocity = new Vector2(0, 0);
		this.AddForce = function(_f) {
			this.force.Add(_f);
		}
		this.Integrate = function(_dt) {
			var acc = this.CurrentForce(this.position);
			acc.Div(this.mass);
			var posDelta = new Vector2(this.velocity.x, this.velocity.y);
			posDelta.Mul(_dt);
			this.position.Add(posDelta);
			acc.Mul(_dt);
			this.velocity.Add(acc);
			this.force = new Vector2(0, 0);
		}
		this.CurrentForce = function(_pos, _vel) {
			var totalForce = new Vector2(this.force.x, this.force.y);
			var speed = this.velocity.Length();
			var dragVel = new Vector2(this.velocity.x, this.velocity.y);
			dragVel.Mul(this.drag * this.mass * speed);
			totalForce.Sub(dragVel);
			return totalForce;
		}
	}

	function ConfettiPaper(_x, _y) {
		this.pos = new Vector2(_x, _y);
		this.rotationSpeed = Math.random() * 600 + 800;
		this.angle = DEG_TO_RAD * Math.random() * 360;
		this.rotation = DEG_TO_RAD * Math.random() * 360;
		this.cosA = 1.0;
		this.size = 5.0;
		this.oscillationSpeed = Math.random() * 1.5 + 0.5;
		this.xSpeed = 40.0;
		this.ySpeed = Math.random() * 60 + 50.0;
		this.corners = new Array();
		this.time = Math.random();
		var ci = Math.round(Math.random() * (colors.length - 1));
		this.frontColor = colors[ci][0];
		this.backColor = colors[ci][1];
		for (var i = 0; i < 4; i++) {
			var dx = Math.cos(this.angle + DEG_TO_RAD * (i * 90 + 45));
			var dy = Math.sin(this.angle + DEG_TO_RAD * (i * 90 + 45));
			this.corners[i] = new Vector2(dx, dy);
		}
		this.Update = function(_dt) {
			this.time += _dt;
			this.rotation += this.rotationSpeed * _dt;
			this.cosA = Math.cos(DEG_TO_RAD * this.rotation);
			this.pos.x += Math.cos(this.time * this.oscillationSpeed) * this.xSpeed * _dt
			this.pos.y += this.ySpeed * _dt;
			if (this.pos.y > ConfettiPaper.bounds.y) {
				this.pos.x = Math.random() * ConfettiPaper.bounds.x;
				this.pos.y = 0;
			}
		}
		this.Draw = function(_g) {
			if (this.cosA > 0) {
				_g.fillStyle = this.frontColor;
			} else {
				_g.fillStyle = this.backColor;
			}
			_g.beginPath();
			_g.moveTo(this.pos.x + this.corners[0].x * this.size, this.pos.y + this.corners[0].y * this.size * this.cosA);
			for (var i = 1; i < 4; i++) {
				_g.lineTo(this.pos.x + this.corners[i].x * this.size, this.pos.y + this.corners[i].y * this.size * this.cosA);
			}
			_g.closePath();
			_g.fill();
		}
	}
	ConfettiPaper.bounds = new Vector2(0, 0);

	function ConfettiRibbon(_x, _y, _count, _dist, _thickness, _angle, _mass, _drag) {
		this.particleDist = _dist;
		this.particleCount = _count;
		this.particleMass = _mass;
		this.particleDrag = _drag;
		this.particles = new Array();
		var ci = Math.round(Math.random() * (colors.length - 1));
		this.frontColor = colors[ci][0];
		this.backColor = colors[ci][1];
		this.xOff = Math.cos(DEG_TO_RAD * _angle) * _thickness;
		this.yOff = Math.sin(DEG_TO_RAD * _angle) * _thickness;
		this.position = new Vector2(_x, _y);
		this.prevPosition = new Vector2(_x, _y);
		this.velocityInherit = Math.random() * 2 + 4;
		this.time = Math.random() * 100;
		this.oscillationSpeed = Math.random() * 2 + 2;
		this.oscillationDistance = Math.random() * 40 + 40;
		this.ySpeed = Math.random() * 40 + 80;
		for (var i = 0; i < this.particleCount; i++) {
			this.particles[i] = new EulerMass(_x, _y - i * this.particleDist, this.particleMass, this.particleDrag);
		}
		this.Update = function(_dt) {
			var i = 0;
			this.time += _dt * this.oscillationSpeed;
			this.position.y += this.ySpeed * _dt;
			this.position.x += Math.cos(this.time) * this.oscillationDistance * _dt;
			this.particles[0].position = this.position;
			var dX = this.prevPosition.x - this.position.x;
			var dY = this.prevPosition.y - this.position.y;
			var delta = Math.sqrt(dX * dX + dY * dY);
			this.prevPosition = new Vector2(this.position.x, this.position.y);
			for (i = 1; i < this.particleCount; i++) {
				var dirP = Vector2.Sub(this.particles[i - 1].position, this.particles[i].position);
				dirP.Normalize();
				dirP.Mul((delta / _dt) * this.velocityInherit);
				this.particles[i].AddForce(dirP);
			}
			for (i = 1; i < this.particleCount; i++) {
				this.particles[i].Integrate(_dt);
			}
			for (i = 1; i < this.particleCount; i++) {
				var rp2 = new Vector2(this.particles[i].position.x, this.particles[i].position.y);
				rp2.Sub(this.particles[i - 1].position);
				rp2.Normalize();
				rp2.Mul(this.particleDist);
				rp2.Add(this.particles[i - 1].position);
				this.particles[i].position = rp2;
			}
			if (this.position.y > ConfettiRibbon.bounds.y + this.particleDist * this.particleCount) {
				this.Reset();
			}
		}
		this.Reset = function() {
			this.position.y = -Math.random() * ConfettiRibbon.bounds.y;
			this.position.x = Math.random() * ConfettiRibbon.bounds.x;
			this.prevPosition = new Vector2(this.position.x, this.position.y);
			this.velocityInherit = Math.random() * 2 + 4;
			this.time = Math.random() * 100;
			this.oscillationSpeed = Math.random() * 2.0 + 1.5;
			this.oscillationDistance = Math.random() * 40 + 40;
			this.ySpeed = Math.random() * 40 + 80;
			var ci = Math.round(Math.random() * (colors.length - 1));
			this.frontColor = colors[ci][0];
			this.backColor = colors[ci][1];
			this.particles = new Array();
			for (var i = 0; i < this.particleCount; i++) {
				this.particles[i] = new EulerMass(this.position.x, this.position.y - i * this.particleDist, this.particleMass, this.particleDrag);
			}
		}
		this.Draw = function(_g) {
			for (var i = 0; i < this.particleCount - 1; i++) {
				var p0 = new Vector2(this.particles[i].position.x + this.xOff, this.particles[i].position.y + this.yOff);
				var p1 = new Vector2(this.particles[i + 1].position.x + this.xOff, this.particles[i + 1].position.y + this.yOff);
				if (this.Side(this.particles[i].position.x, this.particles[i].position.y, this.particles[i + 1].position.x, this.particles[i + 1].position.y, p1.x, p1.y) < 0) {
					_g.fillStyle = this.frontColor;
					_g.strokeStyle = this.frontColor;
				} else {
					_g.fillStyle = this.backColor;
					_g.strokeStyle = this.backColor;
				}
				if (i == 0) {
					_g.beginPath();
					_g.moveTo(this.particles[i].position.x, this.particles[i].position.y);
					_g.lineTo(this.particles[i + 1].position.x, this.particles[i + 1].position.y);
					_g.lineTo((this.particles[i + 1].position.x + p1.x) * 0.5, (this.particles[i + 1].position.y + p1.y) * 0.5);
					_g.closePath();
					_g.stroke();
					_g.fill();
					_g.beginPath();
					_g.moveTo(p1.x, p1.y);
					_g.lineTo(p0.x, p0.y);
					_g.lineTo((this.particles[i + 1].position.x + p1.x) * 0.5, (this.particles[i + 1].position.y + p1.y) * 0.5);
					_g.closePath();
					_g.stroke();
					_g.fill();
				} else if (i == this.particleCount - 2) {
					_g.beginPath();
					_g.moveTo(this.particles[i].position.x, this.particles[i].position.y);
					_g.lineTo(this.particles[i + 1].position.x, this.particles[i + 1].position.y);
					_g.lineTo((this.particles[i].position.x + p0.x) * 0.5, (this.particles[i].position.y + p0.y) * 0.5);
					_g.closePath();
					_g.stroke();
					_g.fill();
					_g.beginPath();
					_g.moveTo(p1.x, p1.y);
					_g.lineTo(p0.x, p0.y);
					_g.lineTo((this.particles[i].position.x + p0.x) * 0.5, (this.particles[i].position.y + p0.y) * 0.5);
					_g.closePath();
					_g.stroke();
					_g.fill();
				} else {
					_g.beginPath();
					_g.moveTo(this.particles[i].position.x, this.particles[i].position.y);
					_g.lineTo(this.particles[i + 1].position.x, this.particles[i + 1].position.y);
					_g.lineTo(p1.x, p1.y);
					_g.lineTo(p0.x, p0.y);
					_g.closePath();
					_g.stroke();
					_g.fill();
				}
			}
		}
		this.Side = function(x1, y1, x2, y2, x3, y3) {
			return ((x1 - x2) * (y3 - y2) - (y1 - y2) * (x3 - x2));
		}
	}
	ConfettiRibbon.bounds = new Vector2(0, 0);
	confetti = {};
	confetti.Context = function(parent) {
		var i = 0;
		var canvasParent = document.getElementById(parent);
		var canvas = document.createElement('canvas');
		canvas.width = canvasParent.offsetWidth;
		canvas.height = canvasParent.offsetHeight;
		canvasParent.appendChild(canvas);
		var context = canvas.getContext('2d');
		var interval = null;
		var confettiRibbonCount = 7;
		var rpCount = 30;
		var rpDist = 8.0;
		var rpThick = 8.0;
		var confettiRibbons = new Array();
		ConfettiRibbon.bounds = new Vector2(canvas.width, canvas.height);
		for (i = 0; i < confettiRibbonCount; i++) {
			confettiRibbons[i] = new ConfettiRibbon(Math.random() * canvas.width, -Math.random() * canvas.height * 2, rpCount, rpDist, rpThick, 45, 1, 0.05);
		}
		var confettiPaperCount = 25;
		var confettiPapers = new Array();
		ConfettiPaper.bounds = new Vector2(canvas.width, canvas.height);
		for (i = 0; i < confettiPaperCount; i++) {
			confettiPapers[i] = new ConfettiPaper(Math.random() * canvas.width, Math.random() * canvas.height);
		}
		this.resize = function() {
			canvas.width = canvasParent.offsetWidth;
			canvas.height = canvasParent.offsetHeight;
			ConfettiPaper.bounds = new Vector2(canvas.width, canvas.height);
			ConfettiRibbon.bounds = new Vector2(canvas.width, canvas.height);
		}
		this.start = function() {
			this.stop()
			var context = this
			this.interval = setInterval(function() {
				confetti.update();
			}, 1000.0 / frameRate)
		}
		this.stop = function() {
			clearInterval(this.interval);
		}
		this.update = function() {
			var i = 0;
			context.clearRect(0, 0, canvas.width, canvas.height);
			for (i = 0; i < confettiPaperCount; i++) {
				confettiPapers[i].Update(dt);
				confettiPapers[i].Draw(context);
			}
			for (i = 0; i < confettiRibbonCount; i++) {
				confettiRibbons[i].Update(dt);
				confettiRibbons[i].Draw(context);
			}
		}
	}
	var confetti = new confetti.Context('confetti');
	confetti.start();
	$( window ).on( 'resize', function() {
		confetti.trigger( 'resize' );
	} );
});
