//Make sure canvasses are in the correct positionG
var maincanvas= document.querySelector("MainCanvas");

var MainCanvas = document.getElementById("MainCanvas");
var MainCanvas_ctx = MainCanvas.getContext("2d");
var maincanvasBackground="lightgrey";
var mouseIsDown=false;
var mouseDownLocation;
var mouseDidMovement=false;
var imageSize=40;
var small_button_size = 20;
var uiDeviceInfoLevel = 1; //What do we display when we look at the network

//The user interface mode.  0=network, 1=network information, 2=puzzle-selection menu
var uiMode=1;


const imageCollection = loadImages(
	["ArrowUp", "ArrowDown", "animations",
		"burnmark", "cellphone", "circle",
		"copier", "firewall", "fluorescent",
		"hub", "ip_phone", "laptop",
		"link", "microwave", "pc", "printer",
		"router", "select", "server",
		"shapes", "square", "switch",
		"tablet", "tree", "vidimage",
		"wap", "wbridge", "wrepeater",
		"wrouter", "x", "info", "menu"],
	["img/ArrowUp.png", "img/ArrowDown.png", "img/Animations.png",
		"img/BurnMark.png", "img/cellphone.png", "img/Circle.png",
		"img/Copier.png", "img/firewall.png", "img/fluorescent.png",
		"img/Hub.png", "img/ip_phone.png", "img/Laptop.png",
		"img/link.png", "img/microwave.png", "img/PC.png",
		"img/Printer.png", "img/Router.png", "img/select.png",
		"img/Server.png", "img/Shapes.png", "img/Square.png",
		"img/Switch.png", "img/tablet.png", "img/tree.png",
		"img/VidImage.png", "img/WAP.png", "img/WBridge.png",
		"img/WRepeater.png", "img/WRouter.png", "img/X.png",
		"img/info.png", "img/menu.png"],
    InitializeGameMenu  // this is called when all images have loaded.
);

var menuItemSize=50;


function loadImages(names, files, onAllLoaded) {
    var i = 0, numLoading = names.length;
    const onload = () => --numLoading === 0 && onAllLoaded();
    const images = {};
    while (i < names.length) {
        const img = images[names[i]] = new Image;
        img.src = files[i++];
        img.onload = onload;
    }
    return images;
}

function imageFromName(name)
{
    return imageCollection[name];
}

function InitializeGameMenu()
{
    console.log("Initializing");
    MainCanvas.addEventListener("touchstart", handleTouchStart);
    MainCanvas.addEventListener("touchend", handleTouchEnd);
    MainCanvas.addEventListener("touchcancel", handleTouchCancel);
    MainCanvas.addEventListener("touchmove", handleTouchMove);
    MainCanvas.addEventListener('mousedown',handleMouseDown);
    MainCanvas.addEventListener('mouseup',handleMouseUp);
    MainCanvas.addEventListener('mousemove',handleMouseMove);

    //MainCanvas_ctx.drawImage(imageCollection['router'],100,100,50,50);
    //MainCanvas_ctx.drawImage(imageCollection['firewall'],150,150,50,50);

	InitializeSelectMenu();
    //It should be printed
    PrintScreen();
}

//Print the screen.  Figure out what needs to be printed based on the mode
function PrintScreen(WhatPassedIn=-1)
{
//allow us to override what is printed
    var what=uiMode;
    if(WhatPassedIn >=0) what=WhatPassedIn;

	console.log("PrintingScreen for mode: " + what);

    if(what == 0)
    {
	//The network drawing mode.  Print the network
	//Clear the old screen
	MainCanvas_ctx.fillStyle = maincanvasBackground;
    MainCanvas_ctx.fillRect(0,0, MainCanvas.width, MainCanvas.height);
	
	//Draw the puzzle-select button
		//Put the X there so we can click on it
	MainCanvas_ctx.drawImage(imageFromName("menu"),MainCanvas.width - small_button_size,0,small_button_size,small_button_size);

	//Draw the info button
	MainCanvas_ctx.drawImage(imageFromName("info"),MainCanvas.width - small_button_size,small_button_size,small_button_size,small_button_size);
	
	drawSelectMenu();
	PrintAllNetworkLinks();
	PrintAllNetworkDevices();
    }
    else if(what == 1) //PuzzleDescription/Info
    {
	//Display the text about the puzzle
	textMenuPrint(puzzle.en_message);
    }
    else if(what == 2) //PuzzleSelect
    {
	//TextMenuSelection
	PrintPuzzleSelectMenu(0);
    }
	
}

function handleTouchStart(evt)
{
    handleMouseDown(copyLocation(evt));
}
function handleTouchEnd(evt)
{
    handleMouseUp(copyLocation(evt));
}
function handleTouchCancel(evt)
{
    evt.preventDefault();
    console.log("canceling touch");
}
function handleTouchMove(evt)
{
    //evt.preventDefault();
    if(evt.touches.length > 0)
    {
    handleMouseMove(copyLocation(evt.touches[0]));
    } else{
    //console.log("not enough touches");
    }
    //console.log("moving touch");
}
function handleMouseDown(evt)
{
    mouseDownLocation = copyLocation(evt);
    mouseIsDown=true;
    //console.log("mousedown");
	if(uiMode==0) SelectMenu_handleMouseDown(mouseDownLocation);
}

function handleMouseUp(evt)
{
    //evt.preventDefault();
    mouseIsDown=false;
    //See if we have a mouse click
    let deltaX = Math.abs(evt.pageX - mouseDownLocation.pageX);
    let deltaY = Math.abs(evt.pageY - mouseDownLocation.pageY);
    //console.log("delta " + deltaX + "," + deltaY);
    if(deltaY < 3 && deltaX <3)
    {
		//We did not move much.  Assume click
		if(evt.pageX <= menuItemSize && !mouseDidMovement)
		{
			if(uiMode==0) SelectMenu_handleMouseUp(evt);

		 //We are in the item select menu.
		}
		if(!mouseDidMovement)
		{ //If we are not dragging, it is a click
			if(uiMode==1) TextWindow_handleMouseUp(evt);
			else if(uiMode==2) TextWindow_handleMouseUp(evt);
			else if(uiMode==0 && evt.pageX >= MainCanvas.width - small_button_size)
			{
					console.log("clicked far enough x wise");
				//We may be clicking on one of the small buttons
				if(evt.pageY < small_button_size) 
				{
					//We clicked on the puzzle-select menu
					console.log("PuzzleSelect pressed");
					uiMode=2;
					PrintScreen();
				} else if(evt.pageY < small_button_size *2)
				{
					console.log("Selected info button");
					//It is the info button
					uiMode=1;
					PrintScreen();
				}
			}
		}
		
    }
    mouseDidMovement=false; //reset it after we raise the button
}


function handleMouseMove(evt)
{
    //evt.preventDefault();
    if(mouseIsDown)
    {
	let deltaX = evt.pageX - mouseDownLocation.pageX;
	let deltaY = evt.pageY - mouseDownLocation.pageY;
	if(isNaN(deltaY)) deltaY=0;
	if(isNaN(deltaX)) deltaX=0;
	//we are dragging
	//console.log('mousemove ' + evt.pageX + " " + evt.pageY + "  delta " + deltaY );
	if(uiMode == 0)
	{
		SelectMenu_handleMouseMove(evt);
	}
		
	mouseDidMovement=true;
    }
	else //Mouse is not down.  Not dragging
	{
		if(uiMode==2)
		{
			textMenu_HandleMouseMove(evt);
		}

	}
}

function copyLocation({ pageX, pageY }) {
  return { pageX, pageY };
}

function PrintNetworkLink(linkToPrint)
{
    //We should have passed in a working link, make sure it exists
    if(linkToPrint !== null)
    {
	if(linkToPrint.SrcNic !== null && linkToPrint.DestNic !== null)
	{
	    //console.log("printing link from " + linkToPrint.SrcNic.hostname);
	    sdevice = deviceFromID(linkToPrint.SrcNic.hostid);
	    ddevice = deviceFromID(linkToPrint.DstNic.hostid);
	    if(sdevice !== null && ddevice !== null)
	    {
		//We have an existing link with two devices.  Find the device locations and print
		var spoint = convertXYPointToActual(newPointFromString(sdevice.location));
		var dpoint = convertXYPointToActual(newPointFromString(ddevice.location));

		//Now we draw a line between them
		MainCanvas_ctx.beginPath();
		MainCanvas_ctx.moveTo(spoint.x,spoint.y);
		MainCanvas_ctx.lineTo(dpoint.x,dpoint.y);
		MainCanvas_ctx.stroke();
	    }
	}
    }
}

function PrintAllNetworkLinks()
{
    if (puzzle == null) return; //If the puzzle has not been set, exit

    let index=0;
	if(puzzle.link !== null && typeof(puzzle.link) === "object")
	{
		while (index < puzzle.link.length) {
		PrintNetworkLink(puzzle.link[index]);
			index++;
		}
	}
}

function PrintNetworkDevice(ToPrint)
{
    //We should have passed in a working device, make sure it exists
    if(ToPrint !== null)
    {
		var rect = deviceRectangle(ToPrint);
		var dname = ToPrint.mytype;
		if(dname=="net_switch") dname="switch";	
		if(dname=="net_hub") dname="hub";	
		//console.log("printing device " + dname);
		MainCanvas_ctx.drawImage(imageFromName(dname), rect.spoint.x, rect.spoint.y, rect.width, rect.height);
		//Now, we see if we need to print the name, or a list of IPs..
		var xpoint = rect.center.x;
		var ystart = rect.epoint.y; //the bottom-most Y point
		var gap = 3;
		switch (uiDeviceInfoLevel) {
			case 0:
				//Do not print anything
				break;
			case 1:
				//Print the name
				printCenteredText(MainCanvas_ctx, ToPrint.hostname, xpoint, ystart);
				break;
			case 2:
				//Print both the name and the IP addresses
				break;
			case 3:
				//print just the ip addresses
				break;
        }
    }
}

function PrintAllNetworkDevices()
{
    if (puzzle == null) return; //If the puzzle has not been set, exit

    let index=0;
    while (index < puzzle.device.length) {
	PrintNetworkDevice(puzzle.device[index]);
        index++;
    }
}

//print centered text.  We use y as the top-most y position.  But we center around the x position
function printCenteredText(canvas_context, text, centerx, top_y, font = "15px serif", textcolor="black") {
	var metrics = canvas_context.measureText(text);
	var yHeight = metrics.fontBoundingBoxAscent + metrics.fontBoundingBoxDescent + tmTextYGap;
	var xWidth = metrics.width;

	var oldfill = canvas_context.fillStyle;
	var oldstroke = canvas_context.strokeStyle;

	canvas_context.font = font;
	canvas_context.fillStyle = textcolor;
	canvas_context.strokeStyle = textcolor;

	canvas_context.fillText(text, centerx - (xWidth / 2), top_y + (yHeight / 3));

	//reset stuff when done
	canvas_context.fillStyle = oldfill;
	canvas_context.strokeStyle = oldstroke;

	return yHeight; //report back how much space we used.  Just in case they want it.
}

function convertXYPointToActual(point)
{
    //We have an x and y coordinate which needs to be converted to the canvas size
    var deltax = (MainCanvas.width - menuItemSize) / puzzle.width;
    var deltay = MainCanvas.height / puzzle.height;
    
   return newPointFromPair((point.x * deltax) + menuItemSize, point.y * deltay);
}

function convertXYpairToActual(x,y)
{
    return convertXYPointToActual(newPointFromPair(x,y));
}

function newPointFromPair(x,y)
{
    var point = { 
	'x' : Math.floor(x),
	'y' : Math.floor(y)
	}
    return point;
}

function newPointFromString(pointasstring)
{
    if(typeof(pointasstring) == "string")
    {
	var tarray=pointasstring.split(",");
	return newPointFromPair(Number(tarray[0]),Number(tarray[1]));
    }
}

//return a rectangle for the device
function deviceRectangle(theDevice)
{
    var centerpoint = convertXYPointToActual(newPointFromString(theDevice.location));
    var delta = imageSize / 2;

    var rect = { 
		spoint : newPointFromPair(centerpoint.x-delta, centerpoint.y-delta),
		height : imageSize,
		width : imageSize,
		epoint : newPointFromPair(centerpoint.x + delta, centerpoint.y + delta),
		center: centerpoint,
	}
    return rect;
}