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/*
TODO
sine / morph in y positions ?
horizontal movement euler + quarternion rotation around in between axis ?
*/
var isMouseDown = false;

var emptySlot = "emptySlot", planeTop = "planeTop", planeBottom = "planeBottom";

var camera, scene, renderer;
var mouse = {x: 0, y: 0};
var camPos = {x: 0, y: 0, z: 10};

var sw = window.innerWidth, sh = window.innerHeight;

var cols = 20;
var rows = 16;
var gap = 20;
var size = {
	width: 100,
	height: 30,
	depth: 150,
}
var planeOffset = 250;
var allRowsDepth = rows * (size.depth + gap);
var allColsWidth = cols * (size.depth + gap);

var speedNormal = 4;
var speedFast = 34;
var speed = speedNormal;

var boxes = {
	planeBottom: [],
	planeTop: []
};
var boxes1d = [];

function num(min, max) { return Math.random() * (max - min) + min; }

function draw(props) {

var colours = {
		slow: {
			r: num(0, 0.2),
			g: num(0.5, 0.9),
			b: num(0.3, 0.7)
		},
		fast: {
			r: num(0.9, 1.0),
			g: num(0.1, 0.7),
			b: num(0.2, 0.5)
		}
	}

var uniforms = {
		r: { type: "f", value: colours.slow.r},
		g: { type: "f", value: colours.slow.g},
		b: { type: "f", value: colours.slow.b},
		distanceX: { type: "f", value: 1.0},
		distanceZ: { type: "f", value: 1.0},
		pulse: { type: "f", value: 0},
		speed: { type: "f", value: speed},
	};

var material = new THREE.ShaderMaterial( {
		uniforms: uniforms,
		vertexShader: vertexShader,
		fragmentShader: fragmentShader
	});

var geometry = new THREE.BoxGeometry(props.width, props.height, props.depth);
	var object = new THREE.Mesh(geometry, material);
	object.colours = colours;
	return object;
}

function init() {

scene = new THREE.Scene();
	// fog doesn't work for shaders - custom solution with distance calculations instead
	// scene.fog = new THREE.FogExp2(0x002000, 0.001);

camera = new THREE.PerspectiveCamera( 100, sw / sh, 1, 10000 );
	scene.add( camera );

// lights don't work either - out of the box anyway, not sure how to feed into shader
	// var lightAbove = new THREE.DirectionalLight(0xff8080, 2);
	// lightAbove.position.set(0, 1, 0.25).normalize();
	// scene.add( lightAbove );

renderer = new THREE.WebGLRenderer({antialias: true});
	renderer.setSize( sw, sh );
	// renderer.setClearColor( scene.fog.color );

for (var j = 0, jl = rows; j < jl; j++) {
		boxes.planeBottom[j] = [];
		boxes.planeTop[j] = [];
		for (var i = 0, il = cols; i < il; i++) {
			boxes.planeBottom[j][i] = emptySlot;
			boxes.planeTop[j][i] = emptySlot;
		};
	};

function createBox() {
		var xi = Math.floor(Math.random() * cols), xai = xi;
		var yi = Math.random() > 0.5 ? 1 : -1, yai = yi === -1 ? planeBottom : planeTop;
		var zi = Math.floor(Math.random() * rows), zai = zi;

var x = (xi - cols / 2) * (size.width + gap);
		var y = yi * planeOffset;
		var z = zi * (size.depth + gap);

if (boxes[yai][zai][xai] === emptySlot) {
			var box = draw(size);
			box.position.y = y;
			box.isWarping = false;
			box.offset = {x: x, z: 0};
			box.posZ = z;

boxes[yai][zai][xai] = box;
			boxes1d.push(box);

scene.add(box);
		}
	}

for (var i = 0, il = rows * cols; i < il; i++) {
		createBox();
	};

document.body.appendChild(renderer.domElement);

render(0);

}

function move(x, y, z) {
	var box = boxes[y][z][x];

if (box !== emptySlot) {

box.position.x = box.offset.x;
		box.position.z = box.offset.z + box.posZ;

if (box.position.z > 0) {
			box.posZ -= allRowsDepth;
		}

// return;
		// if (isMouseDown) return;
		if (!box.isWarping && Math.random() > 0.999) {

var dir = Math.floor(Math.random() * 5), xn = x, zn = z, yn = y, yi = 0, xo = 0, zo = 0;
			switch (dir) {
				case 0 : xn++; xo = 1; break;
				case 1 : xn--; xo = -1; break;
				case 2 : zn++; zo = 1; break;
				case 3 : zn--; zo = -1; break;
				case 4 :
					yn = (y === planeTop) ? planeBottom : planeTop;
					yi = (y === planeTop) ? -1 : 1;

break;
			}

if (boxes[yn][zn] && boxes[yn][zn][xn] === emptySlot) {

boxes[y][z][x] = emptySlot;

box.isWarping = true;

boxes[yn][zn][xn] = box;

// con.log( box.offset.x,  box.offset.z);

if (dir === 4) { // slide vertically
					TweenMax.to(box.position, 0.5, {
						y: yi * planeOffset
					});
				} else { // slide horizontally
					TweenMax.to(box.offset, 0.5, {
						x: box.offset.x + xo * (size.width + gap),
						z: box.offset.z + zo * (size.depth + gap),
					});
				}
				TweenMax.to(box.offset, 0.6, {
					onComplete: function() {
						box.isWarping = false;
					}
				});

}
		}

}
}

function render(time) {

speed -= (speed - (isMouseDown ? speedFast : speedNormal)) * 0.05;

var box;
	for (var b = 0, bl = boxes1d.length; b < bl; b++) {
		box = boxes1d[b];
		box.posZ += speed;

// normalized z distance from camera
		var distanceZ = 1 - ((allRowsDepth - box.posZ) / (allRowsDepth) - 1);
		box.material.uniforms.distanceZ.value = distanceZ;

// normalized x distance from camera (centre)
		var distanceX = 1 - (Math.abs(box.position.x)) / (allColsWidth / 3);
		box.material.uniforms.distanceX.value = distanceX;

var colour = isMouseDown ? box.colours.fast : box.colours.slow;
		box.material.uniforms.r.value -= (box.material.uniforms.r.value - colour.r) * 0.1;
		box.material.uniforms.g.value -= (box.material.uniforms.g.value - colour.g) * 0.1;
		box.material.uniforms.b.value -= (box.material.uniforms.b.value - colour.b) * 0.1;

// normalized speed
		var currentSpeed = (speed - speedNormal) / (speedFast - speedNormal)
		box.material.uniforms.speed.value = currentSpeed;

// pulses more with more speed... of course!
		if (Math.random() > (0.99995 - currentSpeed * 0.005)) {
			box.material.uniforms.pulse.value = 1;
		}
		box.material.uniforms.pulse.value -= box.material.uniforms.pulse.value * 0.1 / (currentSpeed + 1);

// if (b ==13) con.log(box.material.uniforms.speed.value);
	}

for (var j = 0, jl = rows; j < jl; j++) { // iterate through rows: z
		for (var i = 0, il = cols; i < il; i++) { // iterate throw cols: x
			move(i, planeBottom, j);
			move(i, planeTop, j);
		};
	};

camPos.x -= (camPos.x - mouse.x * 400) * 0.02;
	camPos.y -= (camPos.y - mouse.y * 150) * 0.05;
	camPos.z = -100;
	camera.position.set(camPos.x, camPos.y, camPos.z);

// camera.lookAt( scene.position );

// camera.rotation.z = time * 0.0001;
	camera.rotation.y = camPos.x / -1000;
	camera.rotation.x = camPos.y / 1000;
	// camera.rotation.z = camPos.x / -2000;
	camera.rotation.z = (camPos.x - mouse.x * 400) / 2000;

renderer.render( scene, camera );

// if (time < 800)
		requestAnimationFrame( render );
}

var vertexShader = [
"varying vec2 vUv;",
"void main()",
"{",
"  vUv = uv;",
"  vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );",
"  gl_Position = projectionMatrix * mvPosition;",
"}"].join("");

var fragmentShader = [
"uniform float r;",
"uniform float g;",
"uniform float b;",
"uniform float distanceZ;",
"uniform float distanceX;",
"uniform float pulse;",
"uniform float speed;",

"varying vec2 vUv;",

// "float checkerRows = 8.0;",
// "float checkerCols = 16.0;",

"void main( void ) {",
"  vec2 position = abs(-1.0 + 2.0 * vUv);",
"  float edging = abs((pow(position.y, 5.0) + pow(position.x, 5.0)) / 2.0);",
"  float perc = (0.2 * pow(speed + 1.0, 2.0) + edging * 0.8) * distanceZ * distanceX;",

// "  float perc = distanceX * distanceZ;",
// "  vec2 checkPosition = vUv;",
// "  float checkerX = ceil(mod(checkPosition.x, 1.0 / checkerCols) - 1.0 / checkerCols / 2.0);",
// "  float checkerY = ceil(mod(checkPosition.y, 1.0 / checkerRows) - 1.0 / checkerRows / 2.0);",
// "  float checker = ceil(checkerX * checkerY);",
// "  float r = checker;",
// "  float g = checker;",
// "  float b = checker;",

// "  float perc = 1.0;",
"  float red = r * perc + pulse;",
"  float green = g * perc + pulse;",
"  float blue = b * perc + pulse;",
"  gl_FragColor = vec4(red, green, blue, 1.0);",
"}"].join("");

//console.log(THREE, TweenMax, planeTop, planeBottom);
init();

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