var canvas;

var tooltipOpen=true;

var Width  = 960;

var Height = 400;

var delta = [0, 0];

var stage = [195, 250, 1150, 835]   //     bottom

var b2bod = [];

var BALL_SIZE = 40;

var worldAABB, world, iterations = 1, timeStep = 1 / 20;

var walls = [];

var wall_thickness = 10;

var wallsSetted = false;

var bodies, elements, text;

var createMode = false;

var destroyMode = false;

var emptyBottom = true;

var isFreezing = false;

var refLoop, refFileAttente;

var isMouseDown = false;

var isMouseDragging = false;

var isMouseDragging2 = true;

var mouseJoint;

var mouse = { x: 0, y: 0 };

var gravity = { x: 0, y: 0.3 };

var PI2 = Math.PI * 2;

var timeOfLastTouch = 0;

var tweetSilos = [];

init();

play();

/*

listLastTweets();

getInitialTweets();

TweetAnim.shiftQueue();

*/

function init() {

	worldAABB = new b2AABB();

	worldAABB.minVertex.Set( -200, -200 );

	worldAABB.maxVertex.Set( window.innerWidth + 200, window.innerHeight + 200 );

	world = new b2World( worldAABB, new b2Vec2( 0, 0 ), true );

	setWalls();

	reset();

}

function play() {

  if(!isFreezing)

    refLoop = setInterval( loop, 1000 / 40 );

 else

    clearInterval(refLoop);

  isFreezing = !isFreezing;

}

function reset() {

	if(bodies) {

		for (var i= 0; i < bodies.length; i++ ) {

			var body = bodies[ i ]

			canvas.removeChild( body.GetUserData().element );

			world.DestroyBody( body );

			body = null;

		}

	}

	bodies = [];

	elements = [];

}

function onDocumentMouseDown() {

  isMouseDragging = false;

	isMouseDown = true;

	return false;

}

function onDocumentMouseUp() {

	isMouseDown = false;

	return false;

}

function onDocumentMouseMove( event ) {

  if(isMouseDown)

    isMouseDragging = true;

	mouse.x = event.clientX;

	mouse.y = event.clientY;

}

function onDocumentTouchStart( event ) {

	if( event.touches.length == 1 ) {

		event.preventDefault();

		// Faking double click for touch devices

		var now = new Date().getTime();

		if ( now - timeOfLastTouch  < 250 ) {

			reset();

			return;

		}

		timeOfLastTouch = now;

		mouse.x = event.touches[ 0 ].pageX;

		mouse.y = event.touches[ 0 ].pageY;

		isMouseDown = true;

	}

}

function onDocumentTouchMove( event ) {

	if (event.touches.length == 1) {

		event.preventDefault();

		mouse.x = event.touches[ 0 ].pageX;

		mouse.y = event.touches[ 0 ].pageY;

	}

}

function onDocumentTouchEnd( event ) {

	if (event.touches.length == 0) {

		event.preventDefault();

		isMouseDown = false;

	}

}

function loop() {

	delta[0] += (0 - delta[0]) * .5;

	delta[1] += (0 - delta[1]) * .5;

	world.m_gravity.x = gravity.x * 350 + delta[0];

	world.m_gravity.y = gravity.y * 350 + delta[1];

	mouseDrag();

	world.Step(timeStep, iterations);

	for (i = 0; i < bodies.length; i++) {

		var body = bodies[i];

		var element = elements[i];

		element.style.left = (body.m_position0.x - (element.width >> 1)) + 'px';

		element.style.top = (body.m_position0.y - (element.height >> 1)) + 'px';

		if (element.tagName == 'DIV') {

			var rotationStyle = 'rotate(' + (body.m_rotation0 * 57.2957795) + 'deg)';

			text.style.WebkitTransform = rotationStyle;

			text.style.MozTransform = rotationStyle;

			text.style.OTransform = rotationStyle;

			text.style.msTransform = rotationStyle;

		}

	}

}

function createBox(world, x, y, width, height, fixed) {

var c=document.createElement('canvas');

var ctx=c.getContext("2d");

ctx.fillStyle="#FF0000";

ctx.fillRect(0,0,1500,750);

	if (typeof(fixed) == 'undefined') {

		fixed = true;

	}

	var boxSd = new b2BoxDef();

	if (!fixed) {

		boxSd.density = 1.0;

	}

	boxSd.extents.Set(width, height);

	var boxBd = new b2BodyDef();

	boxBd.AddShape(boxSd);

	boxBd.position.Set(x,y);

	return world.CreateBody(boxBd);

}

function mouseDrag()

{

	// mouse press

	if (createMode) {

	} else if (isMouseDown && !mouseJoint) {

		var body = getBodyAtMouse();

		if (body) {

			var md = new b2MouseJointDef();

			md.body1 = world.m_groundBody;

			md.body2 = body;

			md.target.Set(mouse.x, mouse.y);

			md.maxForce = 30000 * body.m_mass;

			md.timeStep = timeStep;

			mouseJoint = world.CreateJoint(md);

			body.WakeUp();

		} else {

			createMode = true;

		}

	}

	if (!isMouseDown) { // mouse release

		createMode = false;

		destroyMode = false;

		if (mouseJoint) {

			world.DestroyJoint(mouseJoint);

			mouseJoint = null;

		}

	}

	if (mouseJoint) { // mouse move

		var p2 = new b2Vec2(mouse.x, mouse.y);

		mouseJoint.SetTarget(p2);

	}

}

function getBodyAtMouse() {

	// Make a small box.

	var mousePVec = new b2Vec2();

	mousePVec.Set(mouse.x, mouse.y);

	var aabb = new b2AABB();

	aabb.minVertex.Set(mouse.x - 1, mouse.y - 1);

	aabb.maxVertex.Set(mouse.x + 1, mouse.y + 1);

	// Query the world for overlapping shapes.

	var k_maxCount = 10;

	var shapes = new Array();

	var count = world.Query(aabb, shapes, k_maxCount);

	var body = null;

	for (var i = 0; i < count; ++i) {

		if (shapes[i].m_body.IsStatic() == false) {

			if ( shapes[i].TestPoint(mousePVec) ) {

				body = shapes[i].m_body;

				break;

			}

		}

	}

	return body;

}

function setWalls() {

	if (wallsSetted) {

		world.DestroyBody(walls[0]);

		world.DestroyBody(walls[1]);

		world.DestroyBody(walls[2]);

		world.DestroyBody(walls[3]);

		walls[0] = null; 

		walls[1] = null;

		walls[2] = null;

		walls[3] = null;

	} else {

  }

}

function  createBallTweetForce(t) {

	var xpos = 40;

  var ypos = 70;

	var element = document.createElement( 'div' );

	element.style.position = 'absolute';

	element.style.left = -200 + 'px';

	element.style.top = -200 + 'px';

	element.style.cursor = "default";

  element.style.hover = "red";

	element.id = t.id_str;

  var id = "tweet_"+bodies.length;

	canvas.appendChild(element);

	elements.push( element );

  BALL_SIZE = 150;

  var circle = document.createElement('canvas');

  var offset = (48 - BALL_SIZE)/2;

  var graphics = circle.getContext('2d');

  		graphics.fillStyle = "white";

		graphics.beginPath();

		graphics.arc(BALL_SIZE* .25+10, BALL_SIZE* .25, BALL_SIZE* .25, 0, PI2, true); 

		graphics.closePath();

		graphics.fill();

  graphics.fillStyle = "#E2F0D6";

  graphics.beginPath();

  graphics.arc(BALL_SIZE * .5 +offset+24, BALL_SIZE * .5+offset+14, BALL_SIZE * .20, 0, PI2, true);

  graphics.closePath();

  graphics.fill();