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'use strict';

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var Robot = function () {
	function Robot(color, light, size, x, y, struct) {
		_classCallCheck(this, Robot);

this.points = [];
		this.links = [];
		this.frame = 0;
		this.dir = 1;
		this.size = size;
		this.color = Math.round(color);
		this.light = light;

// ---- points ----
		var id = 0;
		for (var _iterator = struct.points, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
			var _ref;

if (_isArray) {
				if (_i >= _iterator.length) break;
				_ref = _iterator[_i++];
			} else {
				_i = _iterator.next();
				if (_i.done) break;
				_ref = _i.value;
			}

var p = _ref;

this.points.push(new Point(id++, size * p[0] + x, size * p[1] + y, p[2]));
		}

// ---- links ----
		for (var _iterator2 = struct.links, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
			var _ref2;

if (_isArray2) {
				if (_i2 >= _iterator2.length) break;
				_ref2 = _iterator2[_i2++];
			} else {
				_i2 = _iterator2.next();
				if (_i2.done) break;
				_ref2 = _i2.value;
			}

var l = _ref2;

var p0 = this.points[l[0]];
			var p1 = this.points[l[1]];
			var dx = p0.x - p1.x;
			var dy = p0.y - p1.y;
			this.links.push(new Link(this, p0, p1, Math.sqrt(dx * dx + dy * dy), l[2] * size / 3, l[3], l[4]));
		}
	}

Robot.prototype.update = function update() {

// ---- beat ----
		if (++this.frame % 20 === 0) this.dir = -this.dir;

// ---- create giants ----
		if (dancerDrag && this === dancerDrag && this.size < 16 && this.frame > 600) {
			dancerDrag = null;
			dancers.push(new Robot(this.color, this.light * 1.25, this.size * 2, pointer.x, pointer.y - 100 * this.size * 2, struct));
			dancers.sort(function (d0, d1) {
				return d0.size - d1.size;
			});
		}

// ---- update links ----
		for (var _iterator3 = this.links, _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : _iterator3[Symbol.iterator]();;) {
			var _ref3;

if (_isArray3) {
				if (_i3 >= _iterator3.length) break;
				_ref3 = _iterator3[_i3++];
			} else {
				_i3 = _iterator3.next();
				if (_i3.done) break;
				_ref3 = _i3.value;
			}

var link = _ref3;

var p0 = link.p0;
			var p1 = link.p1;
			var dx = p0.x - p1.x;
			var dy = p0.y - p1.y;
			var dist = Math.sqrt(dx * dx + dy * dy);

if (dist) {

var tw = p0.w + p1.w;
				var r1 = p1.w / tw;
				var r0 = p0.w / tw;
				var dz = (link.distance - dist) * link.force;
				dx = dx / dist * dz;
				dy = dy / dist * dz;
				p1.x -= dx * r0;
				p1.y -= dy * r0;
				p0.x += dx * r1;
				p0.y += dy * r1;
			}
		}

// ---- update points ----
		for (var _iterator4 = this.points, _isArray4 = Array.isArray(_iterator4), _i4 = 0, _iterator4 = _isArray4 ? _iterator4 : _iterator4[Symbol.iterator]();;) {
			var _ref4;

if (_isArray4) {
				if (_i4 >= _iterator4.length) break;
				_ref4 = _iterator4[_i4++];
			} else {
				_i4 = _iterator4.next();
				if (_i4.done) break;
				_ref4 = _i4.value;
			}

var point = _ref4;

// ---- drag ----
			if (this === dancerDrag && point === pointDrag) {

point.x += (pointer.x - point.x) * 0.1;
				point.y += (pointer.y - point.y) * 0.1;
			}

// ---- dance ----
			if (this !== dancerDrag) {

point.fn && point.fn(16 * Math.sqrt(this.size), this.dir);
			}

// ---- verlet integration ----
			point.vx = point.x - point.px;
			point.vy = point.y - point.py;
			point.px = point.x;
			point.py = point.y;
			point.vx *= 0.995;
			point.vy *= 0.995;
			point.x += point.vx;
			point.y += point.vy + 0.01;
		}

for (var _iterator5 = this.links, _isArray5 = Array.isArray(_iterator5), _i5 = 0, _iterator5 = _isArray5 ? _iterator5 : _iterator5[Symbol.iterator]();;) {
			var _ref5;

if (_isArray5) {
				if (_i5 >= _iterator5.length) break;
				_ref5 = _iterator5[_i5++];
			} else {
				_i5 = _iterator5.next();
				if (_i5.done) break;
				_ref5 = _i5.value;
			}

var link = _ref5;

var p1 = link.p1;

// ---- ground ----
			if (p1.y > canvas.height * ground - link.size * 0.5) {
				p1.y = canvas.height * ground - link.size * 0.5;
				p1.x -= p1.vx;
				p1.vx = 0;
				p1.vy = 0;
			}

// ---- borders ----
			if (p1.id === 1 || p1.id === 2) {
				if (p1.x > canvas.width - link.size) p1.x = canvas.width - link.size;else if (p1.x < link.size) p1.x = link.size;
			}
		}
	};

Robot.prototype.draw = function draw() {

for (var _iterator6 = this.links, _isArray6 = Array.isArray(_iterator6), _i6 = 0, _iterator6 = _isArray6 ? _iterator6 : _iterator6[Symbol.iterator]();;) {
			var _ref6;

if (_isArray6) {
				if (_i6 >= _iterator6.length) break;
				_ref6 = _iterator6[_i6++];
			} else {
				_i6 = _iterator6.next();
				if (_i6.done) break;
				_ref6 = _i6.value;
			}

var link = _ref6;

if (link.size) {

var dx = link.p1.x - link.p0.x;
				var dy = link.p1.y - link.p0.y;
				var a = Math.atan2(dy, dx);
				var d = Math.sqrt(dx * dx + dy * dy);

// ---- shadow ----
				ctx.save();
				ctx.translate(link.p0.x + link.size * 0.25, link.p0.y + link.size * 0.25);
				ctx.rotate(a);
				ctx.drawImage(link.shadow, -link.size * 0.5, -link.size * 0.5, d + link.size, link.size);
				ctx.restore();

// ---- stroke ----
				ctx.save();
				ctx.translate(link.p0.x, link.p0.y);
				ctx.rotate(a);
				ctx.drawImage(link.image, -link.size * 0.5, -link.size * 0.5, d + link.size, link.size);
				ctx.restore();
			}
		}
	};

return Robot;
}();

var Link = function Link(parent, p0, p1, dist, size, light, force) {
	_classCallCheck(this, Link);

// ---- cache strokes ----
	function stroke(color, axis) {

var image = document.createElement('canvas');
		image.width = dist + size;
		image.height = size;
		var ict = image.getContext('2d');
		ict.beginPath();
		ict.lineCap = "round";
		ict.lineWidth = size;
		ict.strokeStyle = color;
		ict.moveTo(size * 0.5, size * 0.5);
		ict.lineTo(size * 0.5 + dist, size * 0.5);
		ict.stroke();
		if (axis) {
			var s = size / 10;
			ict.fillStyle = "#000";
			ict.fillRect(size * 0.5 - s, size * 0.5 - s, s * 2, s * 2);
			ict.fillRect(size * 0.5 - s + dist, size * 0.5 - s, s * 2, s * 2);
		}
		return image;
	}

this.p0 = p0;
	this.p1 = p1;
	this.distance = dist;
	this.size = size;
	this.light = light || 1.0;
	this.force = force || 0.5;
	this.image = stroke("hsl(" + parent.color + " ,30%, " + parent.light * this.light + "%)", true);
	this.shadow = stroke("rgba(0,0,0,0.5)");
};

var Point = function Point(id, x, y, fn, w) {
	_classCallCheck(this, Point);

this.id = id;
	this.x = x;
	this.y = y;
	this.w = w || 0.5;
	this.fn = fn || null;
	this.px = x;
	this.py = y;
	this.vx = 0;
	this.vy = 0;
};

var Canvas = function () {
	function Canvas() {
		var _this = this;

_classCallCheck(this, Canvas);

this.elem = document.createElement('canvas');
		this.ctx = this.elem.getContext('2d');
		document.body.appendChild(this.elem);
		this.resize();
		window.addEventListener('resize', function () {
			return _this.resize();
		}, false);
	}

Canvas.prototype.resize = function resize() {

var o = this.elem;
		this.width = this.elem.width = this.elem.offsetWidth;
		this.height = this.elem.height = this.elem.offsetHeight;
		ground = this.height > 500 ? 0.85 : 1.0;
	};

return Canvas;
}();

var Pointer = function () {
	function Pointer(canvas) {
		var _this2 = this;

_classCallCheck(this, Pointer);

this.x = 0;
		this.y = 0;
		this.canvas = canvas;

Pointer.prototype.down = function down(e) {

this.move(e);

for (var _iterator7 = dancers, _isArray7 = Array.isArray(_iterator7), _i7 = 0, _iterator7 = _isArray7 ? _iterator7 : _iterator7[Symbol.iterator]();;) {
			var _ref7;

if (_isArray7) {
				if (_i7 >= _iterator7.length) break;
				_ref7 = _iterator7[_i7++];
			} else {
				_i7 = _iterator7.next();
				if (_i7.done) break;
				_ref7 = _i7.value;
			}

var dancer = _ref7;

for (var _iterator8 = dancer.points, _isArray8 = Array.isArray(_iterator8), _i8 = 0, _iterator8 = _isArray8 ? _iterator8 : _iterator8[Symbol.iterator]();;) {
				var _ref8;

if (_isArray8) {
					if (_i8 >= _iterator8.length) break;
					_ref8 = _iterator8[_i8++];
				} else {
					_i8 = _iterator8.next();
					if (_i8.done) break;
					_ref8 = _i8.value;
				}

var point = _ref8;

var dx = pointer.x - point.x;
				var dy = pointer.y - point.y;
				var d = Math.sqrt(dx * dx + dy * dy);
				if (d < 60) {
					dancerDrag = dancer;
					pointDrag = point;
					dancer.frame = 0;
				}
			}
		}
	};

Pointer.prototype.up = function up(e) {
		dancerDrag = null;
	};

Pointer.prototype.move = function move(e) {

var touchMode = e.targetTouches,
		    pointer = undefined;
		if (touchMode) {
			e.preventDefault();
			pointer = touchMode[0];
		} else pointer = e;
		this.x = pointer.clientX;
		this.y = pointer.clientY;
	};

return Pointer;
}();

// ---- init ----

var ground = 1.0;
var canvas = new Canvas();
var ctx = canvas.ctx;
var pointer = new Pointer(canvas);
var dancerDrag = null;
var pointDrag = null;

// ---- main loop ----

function run() {

requestAnimationFrame(run);
	ctx.clearRect(0, 0, canvas.width, canvas.height);
	ctx.fillStyle = "#222";
	ctx.fillRect(0, 0, canvas.width, canvas.height * 0.15);
	ctx.fillRect(0, canvas.height * 0.85, canvas.width, canvas.height * 0.15);

for (var _iterator9 = dancers, _isArray9 = Array.isArray(_iterator9), _i9 = 0, _iterator9 = _isArray9 ? _iterator9 : _iterator9[Symbol.iterator]();;) {
		var _ref9;

if (_isArray9) {
			if (_i9 >= _iterator9.length) break;
			_ref9 = _iterator9[_i9++];
		} else {
			_i9 = _iterator9.next();
			if (_i9.done) break;
			_ref9 = _i9.value;
		}

var dancer = _ref9;

dancer.update();
		dancer.draw();
	}
}

// ---- robot structure ----

var struct = {

points: [[0, -4, function (s, d) {
		this.y -= 0.01 * s;
	}], [0, -16, function (s, d) {
		this.y -= 0.02 * s * d;
	}], [0, 12, function (s, d) {
		this.y += 0.02 * s * d;
	}], [-12, 0], [12, 0], [-3, 34, function (s, d) {
		if (d > 0) {
			this.x += 0.01 * s;
			this.y -= 0.015 * s;
		} else {
			this.y += 0.02 * s;
		}
	}], [3, 34, function (s, d) {
		if (d > 0) {
			this.y += 0.02 * s;
		} else {
			this.x -= 0.01 * s;
			this.y -= 0.015 * s;
		}
	}], [-28, 0, function (s, d) {
		this.x += this.vx * 0.035;
		this.y -= 0.001 * s;
	}], [28, 0, function (s, d) {
		this.x += this.vx * 0.035;
		this.y -= 0.001 * s;
	}], [-3, 64, function (s, d) {
		this.y += 0.02 * s;
		if (d > 0) {
			this.y -= 0.01 * s;
		} else {
			this.y += 0.05 * s;
		}
	}], [3, 64, function (s, d) {
		this.y += 0.02 * s;
		if (d > 0) {
			this.y += 0.05 * s;
		} else {
			this.y -= 0.01 * s;
		}
	}], [0, -4.1]],

links: [[3, 7, 12, 0.5], [1, 3, 24, 0.5], [1, 0, 18, 0.5], [0, 11, 60, 0.8], [5, 9, 16, 0.5], [2, 5, 32, 0.5], [1, 2, 50, 1], [6, 10, 16, 1.5], [2, 6, 32, 1.5], [4, 8, 12, 1.5], [1, 4, 24, 1.5]]
};

// ---- instanciate robots ----
var dancers = [];

for (var i = 0; i < 6; i++) {
	dancers.push(new Robot(i * 360 / 7, 80, 4, (i + 2) * canvas.width / 9, canvas.height * ground - 295, struct));
}

run();

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