var graphs, 
	variables,
	currentEditor,
	maxSquareCount, 
	minSquareCount, 
	padding, 
	paddingFactor,
	tickFactor,
	textHeight,
	paddingDivider, 
	scrollFactor, 
	squareCount,
	axisDispo,
	axisDispoPI,
	origin,
	distance,
	valid, 
	editing;


function setup(){
	frameRate(0);
	assignGlobalVariables();
	restoreSettings();
	//restoreStandard();
	prepareVisibilites();
	updateAll();
	updateScroll();
}

function assignGlobalVariables(){
	graphs = [],
	variables = [],
	currentEditor = null,
	maxSquareCount = {x: 20, y: 15},
	minSquareCount = {x: 15, y: 10},
	squareCount = {x: 0, y: 0},
	padding = {x: 50, y: 50},
	paddingFactor = {x: 1, y: 1},
	paddingDivider = {x: 0, y: 0},
	axisDispoPI = {x: false, y: false},
	axisDispo = 2,
	tickFactor = 1,
	origin = {x: 0, y: 0},
	distance = {x: 0, y: 0},
	textHeight = 15;
}


function addGraph(){
	var newGraph = new Graph($("#input").val());
	var same = false;
	if (newGraph.getName().length == 0) return;
	graphs.forEach(function(g){
		if (g.getName() == newGraph.getName()){
			newGraph.setColor(g.getColor());
			newGraph.setThickness(g.getThickness());
			graphs[graphs.indexOf(g)] = newGraph;
			same = true;
		}
	});
	if (!same){
		graphs.push(newGraph);
		$("#input").val(newGraph.getFullDescription());
	}
	updateAll();
}


function updateAll(){
	updateInterface();
	updateDisplay();
	safeSettings();
}

function updateDisplay(){
	prepareGridValues();
	drawGrid();
	drawGraphs();
}

function updateInterface(){
	$("#functions").html("");
	graphs.forEach(function(g){
		var bc = g.getColor();
		var c = g.visible ? g.getColor() : "none";
		$("#functions").append("<tr><td><div style=\"background-color: " + c + "; border-color: " + bc + "\" onclick=\"toggleGraph(this)\""
		+ "></div></td><td><button onclick=\"editGraph(this)\">" + g.getFullDescription() 
		+ "</button></td><td><button onclick=\"deleteGraph(this)\">X</button></td></tr>");
	});
}

function prepareGridValues(){
	squareCount.x = width / padding.x;
	squareCount.y = height / padding.y;
	while (squareCount.x > maxSquareCount.x){
		squareCount.x = round(squareCount.x / axisDispo);
		paddingFactor.x *= axisDispo;
		padding.x *= axisDispo;
	}
	while (squareCount.y > maxSquareCount.y){
		squareCount.y = round(squareCount.y / axisDispo);
		paddingFactor.y *= axisDispo;
		padding.y *= axisDispo;
	}
	while (squareCount.x < minSquareCount.x){
		squareCount.x *= axisDispo;
		paddingFactor.x /= axisDispo;
		padding.x = round(padding.x / axisDispo);
	}
	while (squareCount.y < minSquareCount.y){
		squareCount.y *= axisDispo;
		paddingFactor.y /= axisDispo;
		padding.y = round(padding.y / axisDispo);
	}
	squareCount.x = round(squareCount.x);
	squareCount.y = round(squareCount.y);
	paddingDivider.x = padding.x / paddingFactor.x;
	paddingDivider.y = padding.y / paddingFactor.y;
}

function drawGrid(){
	clear();
	
	stroke("#000");
	strokeWeight(2);
	
	line(0, origin.y, width, origin.y);
	line(origin.x, height, origin.x, 0);
	
	strokeWeight(0.25);
	
	var centerX = (origin.x - width / 2) % padding.x + width / 2;
	var centerY = (origin.y - height / 2) % padding.y + height / 2;
	var x, y, numX, numY, textWidthX, textWidthY, i;

	for (i = 0; i < squareCount.x * 2; i++){
		x = centerX - squareCount.x * padding.x + padding.x * i;
		if (axisDispoPI.x) numX = round((x - origin.x) / padding.x * paddingFactor.x / PI * 100) / 100 + "π";
		if (!axisDispoPI.x) numX = round((x - origin.x) / padding.x) * paddingFactor.x;
		if (numX == 0 || numX == "0π") numX = "";
		line(x, 0, x, height);
		textWidthX = textWidth(str(numX));
		text(numX, x - textWidthX / 2, origin.y + textHeight / 2, textWidthX, textHeight);
	}
	for (i = 0; i < squareCount.y * 2; i++){
		y = centerY - squareCount.y * padding.y + padding.y * i;
		if (axisDispoPI.y) numY = -round((y - origin.y) / padding.y * paddingFactor.y / PI * 100) / 100 + "π";
		if (!axisDispoPI.y) numY = -round((y - origin.y) / padding.y) * paddingFactor.y;
		if (numY == 0 || numY == "0π") numY = "";
		line(0, y, width, y);
		textWidthY = textWidth(str(numY));
		text(numY, origin.x - textWidthY - textHeight / 2, y - textHeight / 2, textWidthY, textHeight);
	}
}

function drawGraphs(){
	graphs.forEach(function(g){
		if (!g.visible) return;
		var rdyFunc = g.getExecuteFunction();
		var r = g.getReference();
		function f(value){
			var y;
			var execFunc = rdyFunc.replace(new RegExp(r, "g"), value);
			try{y = eval(execFunc);} catch(e){y = null;}
			return y;
		}
		var pointsRange = [], x, y;
		for (var px = 0; px <= width; px += tickFactor){
			x = (px - origin.x) / paddingDivider.x;
			y = f(x);
			pointsRange[px / tickFactor] = {x: x, y: y};
		}
		g.setPoints(pointsRange);
	});
	graphs.forEach(function(g){
		if (!g.visible) return;
		var t = g.getThickness(), x, y;
		stroke(g.getColor());
		strokeWeight(t);
		
		
		g.getPoints().forEach(function(p){
			x = origin.x + p.x * paddingDivider.x;
			y = origin.y - p.y * paddingDivider.y;
			if (x != null && y != null) line(x, y, x + t / 4, y);
		});
		
		//Straight lines instead of points:
		
		/*for (var i = 0; i < g.getPoints().length; i++){
			p = g.getPoints()[i];
			x1 = origin.x + p.x * paddingDivider.x;
			y1 = origin.y - p.y * paddingDivider.y;
			try{
				x2 = origin.x + g.getPoints()[i + 1].x * paddingDivider.x;
				y2 = origin.y - g.getPoints()[i + 1].y * paddingDivider.y;
				line(x1, y1, x2, y2);
			}catch(e){}
		}*/
		
	});
}



function editGraph(obj){
	var i = $(obj).parent().parent().index();
	obj.blur();
	currentEditor = new Editor(obj, i);
}

function deleteGraph(obj){
	var i = $(obj).parent().parent().index();
	obj.blur();
	graphs.splice(i, 1);
	updateAll();
}

function toggleGraph(obj){
	var i = $(obj).parent().parent().index();
	obj.blur();
	graphs[i].visible = !graphs[i].visible;
	updateAll();
}



function mouseWheel(event){
	if (mouseX > 0 && mouseY < height && !editing){
		var oldPaddingX = padding.x;
		var oldPaddingY = padding.y;
		var oldPaddingFactorX = paddingFactor.x;
		var oldPaddingFactorY = paddingFactor.y;
		padding.x *= (scrollFactor - (event.delta > 0 ? 3 : -3)) / scrollFactor;
		padding.y *= (scrollFactor - (event.delta > 0 ? 3 : -3)) / scrollFactor;
		padding.x = round(padding.x);
		padding.y = round(padding.y);
		
		prepareGridValues();
		
		origin.x = -(mouseX - origin.x) / (oldPaddingX / oldPaddingFactorX) * (padding.x / paddingFactor.x) + mouseX;
		origin.y = -(mouseY - origin.y) / (oldPaddingY / oldPaddingFactorY) * (padding.y / paddingFactor.y) + mouseY;
		
		updateDisplay();
	}
}

function updateScroll(){
	scrollFactor = round((500 - $("#scroll_input").val() * 0.95) / 5);
}

function updateDisposition(obj, xAxis){
	obj.blur();
	var dispo = $(obj).val();
	if (xAxis){
		if (dispo == "PI" && !axisDispoPI.x){
			paddingFactor.x *= PI;
			padding.x *= PI;
			axisDispoPI.x = true;
		}
		if (dispo == "1" && axisDispoPI.x){
			paddingFactor.x /= PI;
			padding.x /= PI;
			axisDispoPI.x = false;
		}
	}
	if (!xAxis){
		if (dispo == "PI" && !axisDispoPI.y){
			paddingFactor.y *= PI;
			padding.y *= PI;
			axisDispoPI.y = true;
		}
		if (dispo == "1" && axisDispoPI.y){
			paddingFactor.y /= PI;
			padding.y /= PI;
			axisDispoPI.y = false;
		}
	}
	updateAll();
}

function mouseDragged(){
	if (editing){currentEditor.colorPicker.mouseDragged();}
	else if (valid){
		origin.x = round(mouseX - distance.x);
		origin.y = round(mouseY - distance.y);
		updateDisplay();
	}
}

function mousePressed(){
	if (editing){currentEditor.colorPicker.mousePressed();}
	else if (mouseX > 0 && mouseY < height){
		valid = true;
		distance.x = mouseX - origin.x;
		distance.y = mouseY - origin.y;
		$("#defaultCanvas0").css("cursor", "all-scroll");
	} else {valid = false;}
}

function mouseReleased(){
	if (editing){currentEditor.colorPicker.mouseReleased();}
	$("#defaultCanvas0").css("cursor", "auto");
}


function prepareVisibilites(){
	if (!editing) $("#graph_editor_wrapper").hide();
	$("#canvas_holder").css("height", windowHeight - $("#input_holder").outerHeight() + "px");
    var canvas = createCanvas(windowWidth - $("#displayer").outerWidth(), windowHeight - $("#input_holder").outerHeight());
	canvas.parent("canvas_holder");
	$(".holder:not(#settings_holder)").css("height", windowHeight * 0.7 * 0.5 + "px");
	$("#settings_holder").css("height", $("#displayer").outerHeight() - $("#function_holder").outerHeight() - $("#variable_holder").outerHeight() - 80 + "px");
	origin.x = width / 2;
	origin.y = height / 2;
	textFont("Arial", textHeight);
	$("body").css("background-color", "#FFF");
}