var orderIndex = 1000;

export class WindowController {

	win					= null;
	titlebar			= null;
	canvas				= null;
	resizers			= null;
	btnClose			= null;
	btnMaximize			= null;

	isSnapped			= false;
	isMaximized			= false;
	isDragging			= false;
	dragType			= null;
	currentResizer		= null;

	savedPosition		= null;
	savedBeforeMaximize	= null;

	order				= orderIndex++;

	startX				= 0;
	startY				= 0;
	startLeft			= 100;
	startTop			= 100;
	startWidth			= 500;
	startHeight			= 500;

	width				= this.startWidth;

	height				= this.startHeight;

	constructor() {


		

	}

	setElement( element ) {

		this.canvas = element;

		console.log("set element",element);

	}

	create( element ) {

		var windowFrame = document.createElement( "div" );

		windowFrame.id = "win"

		windowFrame.style.width		= this.startWidth + "px";

		windowFrame.style.height	= this.startHeight + "px";


		windowFrame.style.left		= this.startLeft + "px";

		windowFrame.style.top		= this.startTop + "px";


		// Title bar
		var titleBar = document.createElement( "div" );
		titleBar.className = "titlebar";
		titleBar.textContent = "Source Code Graph";

		var buttons = document.createElement( "div" );
		buttons.className = "buttons";

		var btnMaximize = document.createElement( "button" );
		btnMaximize.id = "btnMaximize";
		btnMaximize.title = "Maximize";
		btnMaximize.textContent = "m";

		var btnClose = document.createElement( "button" );
		btnClose.id = "btnClose";
		btnClose.title = "Close";
		btnClose.textContent = "×";

		buttons.appendChild( btnMaximize );
		buttons.appendChild( btnClose );
		titleBar.appendChild( buttons );
		windowFrame.appendChild( titleBar );

		// Content
		var content = document.createElement( "div" );
		content.className = "content";


		console.log(this.canvas);

		content.appendChild( this.canvas );



		windowFrame.appendChild( content );

		// Resizers
		var resizerClasses = [
			"top-left", "top", "top-right", "right",
			"bottom-right", "bottom", "bottom-left", "left"
		];

		this.resizers = new Array();

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

			var resizer = document.createElement( "div" );

			resizer.className = "resizer " + resizerClasses[i];

			windowFrame.appendChild( resizer );

			this.resizers.push(resizer)

		}

		this.win			= windowFrame;
		this.titlebar		= titleBar;

		this.btnClose		= btnClose;
		this.btnMaximize	= btnMaximize;

		this.titlebar.addEventListener("mousedown", this.onTitlebarMouseDown.bind(this));

		this.resizers.forEach(this.bindResizer.bind(this));

		this.btnClose.addEventListener("click", this.onCloseClick.bind(this));
		this.btnMaximize.addEventListener("click", this.onMaximizeClick.bind(this));

		document.body.appendChild( windowFrame );

		this.win.addEventListener("mousedown", this.reOrder.bind( this ) );

	}

	setup() {

		this.create();

	}

	setGraphExplorer( graphExplorer ) {

		this.graphExplorer = graphExplorer;

	}

	saveWindowState() {

		this.savedPosition = {
			left:	this.win.offsetLeft,
			top:	this.win.offsetTop,
			width:	this.win.offsetWidth,
			height:	this.win.offsetHeight
		};

	}

	hide() {

		this.win.style.display = "none"

	}

	show() {

		this.win.style.display = "flex"

	}

	restoreWindowState() {

		if (!this.savedPosition) return;

		this.win.style.left		= this.savedPosition.left + "px";
		this.win.style.top		= this.savedPosition.top + "px";
		this.win.style.width	= this.savedPosition.width + "px";
		this.win.style.height	= this.savedPosition.height + "px";

		this.savedPosition		= null;
		this.isSnapped			= false;

	}

	resizeCanvas() {

		const style		= getComputedStyle(this.win);
		const width		= parseInt(style.width);
		const height	= parseInt(style.height);

		//this.canvas.width			= width;
		//this.canvas.height			= height;
		//this.canvas.style.width		= width + "px";
		//this.canvas.style.height	= height + "px";

		//console.log(this.graphExplorer);

		if(this.graphExplorer)
		this.graphExplorer.onResize( width, height );
		//this.draw();

	}



	snapWindow(mouseX, mouseY) {

		if (this.isMaximized) return;

		const snapMargin	= 30;
		const vw			= window.innerWidth;
		const vh			= window.innerHeight;

		const nearLeft		= mouseX <= snapMargin;
		const nearRight		= mouseX >= vw - snapMargin;
		const nearTop		= mouseY <= snapMargin;
		const nearBottom	= mouseY >= vh - snapMargin;

		if (!this.isSnapped && (nearLeft || nearRight || nearTop || nearBottom)) {

			this.saveWindowState();
			this.isSnapped = true;

		} else if (!nearLeft && !nearRight && !nearTop && !nearBottom && this.isSnapped) {

			this.restoreWindowState();
			return;

		}

		if (!this.isSnapped) return;

		if (nearTop && nearLeft) {

			this.setWindowRect(0, 0, vw / 2, vh / 2);

		} else if (nearTop && nearRight) {

			this.setWindowRect(vw / 2, 0, vw / 2, vh / 2);

		} else if (nearBottom && nearLeft) {

			this.setWindowRect(0, vh / 2, vw / 2, vh / 2);

		} else if (nearBottom && nearRight) {

			this.setWindowRect(vw / 2, vh / 2, vw / 2, vh / 2);

		} else if (nearTop) {

			this.setWindowRect(0, 0, vw, vh / 2);

		} else if (nearBottom) {

			this.setWindowRect(0, vh / 2, vw, vh / 2);

		} else if (nearLeft) {

			this.setWindowRect(0, 0, vw / 2, vh);

		} else if (nearRight) {

			this.setWindowRect(vw / 2, 0, vw / 2, vh);

		}

		this.resizeCanvas();

	}

	setWindowRect(left, top, width, height) {

		this.win.style.left		= Math.floor(left) + "px";
		this.win.style.top		= Math.floor(top) + "px";
		this.win.style.width	= Math.floor(width) + "px";
		this.win.style.height	= Math.floor(height) + "px";

	}

	onTitlebarMouseDown(event) {

		event.preventDefault();

		this.dragType = "move";

		const offsetX = event.clientX - this.win.offsetLeft;
		const offsetY = event.clientY - this.win.offsetTop;

		if (this.isSnapped) {

			this.restoreWindowState();

			this.startX		= event.clientX;
			this.startY		= event.clientY;
			this.startLeft	= event.clientX - 100;
			this.startTop	= event.clientY - offsetY;

			this.win.style.left = this.startLeft + "px";
			this.win.style.top	= this.startTop + "px";

		} else {

			this.startX		= event.clientX;
			this.startY		= event.clientY;
			this.startLeft	= this.win.offsetLeft;
			this.startTop	= this.win.offsetTop;

		}

		this.isDragging = true;

		document.addEventListener("mousemove", this.onDragMove);
		document.addEventListener("mouseup", this.onDragEnd);

	}

	onDragMove = (event) => {




		event.preventDefault();

		if (!this.isDragging) return;

		const dx = event.clientX - this.startX;
		const dy = event.clientY - this.startY;

		if (this.dragType === "move") {

			let newLeft	= this.startLeft + dx;
			let newTop	= this.startTop + dy;

			newLeft	= Math.max(0, Math.min(window.innerWidth - this.win.offsetWidth, newLeft));
			newTop	= Math.max(0, Math.min(window.innerHeight - this.win.offsetHeight, newTop));

			this.win.style.left	= newLeft + "px";
			this.win.style.top	= newTop + "px";

			this.snapWindow(event.clientX, event.clientY);

		} else if (this.dragType === "resize") {

			let newWidth	= this.startWidth;
			let newHeight	= this.startHeight;
			let newLeft		= this.startLeft;
			let newTop		= this.startTop;

			switch (this.currentResizer) {
				case "top":
					newHeight	= this.startHeight - dy;
					newTop		= this.startTop + dy;
					break;
				case "bottom":
					newHeight	= this.startHeight + dy;
					break;
				case "left":
					newWidth	= this.startWidth - dx;
					newLeft		= this.startLeft + dx;
					break;
				case "right":
					newWidth	= this.startWidth + dx;
					break;
				case "top-left":
					newWidth	= this.startWidth - dx;
					newLeft		= this.startLeft + dx;
					newHeight	= this.startHeight - dy;
					newTop		= this.startTop + dy;
					break;
				case "top-right":
					newWidth	= this.startWidth + dx;
					newHeight	= this.startHeight - dy;
					newTop		= this.startTop + dy;
					break;
				case "bottom-left":
					newWidth	= this.startWidth - dx;
					newLeft		= this.startLeft + dx;
					newHeight	= this.startHeight + dy;
					break;
				case "bottom-right":
					newWidth	= this.startWidth + dx;
					newHeight	= this.startHeight + dy;
					break;
			}

			if (newWidth > 100) {
				this.win.style.width	= newWidth + "px";
				this.win.style.left		= newLeft + "px";
			}

			if (newHeight > 100) {
				this.win.style.height	= newHeight + "px";
				this.win.style.top		= newTop + "px";
			}

		}

		this.resizeCanvas();

	};

	onDragEnd = () => {

		this.isDragging		= false;
		this.dragType		= null;
		this.currentResizer	= null;

		document.removeEventListener("mousemove", this.onDragMove);
		document.removeEventListener("mouseup", this.onDragEnd);

	};

	reOrder() {

		orderIndex++;

		this.win.style['z-index'] = orderIndex;


		console.log("this.win.style['z-index']", this.win.style['z-index']);
	}

	onResizerMouseDown(event) {




		event.preventDefault();

		this.startX			= event.clientX;
		this.startY			= event.clientY;
		this.startLeft		= this.win.offsetLeft;
		this.startTop		= this.win.offsetTop;
		this.startWidth		= this.win.offsetWidth;
		this.startHeight	= this.win.offsetHeight;

		this.isDragging		= true;
		this.dragType		= "resize";
		this.currentResizer	= event.target.classList[1];

		document.addEventListener("mousemove", this.onDragMove);
		document.addEventListener("mouseup", this.onDragEnd);

	}

	bindResizer(resizerElement) {

		resizerElement.addEventListener("mousedown", this.onResizerMouseDown.bind(this));

	}

	maximizeWindow() {

		if (this.isMaximized) return;

		this.savedBeforeMaximize = {
			left:	this.win.offsetLeft,
			top:	this.win.offsetTop,
			width:	this.win.offsetWidth,
			height:	this.win.offsetHeight
		};

		this.setWindowRect(0, 0, window.innerWidth, window.innerHeight);

		this.resizeCanvas();

		this.isMaximized		= true;
		this.isSnapped			= false;
		this.savedPosition		= null;

	}

	restoreFromMaximize() {

		if (!this.isMaximized || !this.savedBeforeMaximize) return;

		this.setWindowRect(
			this.savedBeforeMaximize.left,
			this.savedBeforeMaximize.top,
			this.savedBeforeMaximize.width,
			this.savedBeforeMaximize.height
		);

		this.resizeCanvas();

		this.isMaximized			= false;
		this.savedBeforeMaximize	= null;

	}

	onMaximizeClick() {



		if (this.isMaximized) {

			this.restoreFromMaximize();

		} else {

			this.maximizeWindow();

		}

	}

	onCloseClick() {

		this.win.style.display = "none";

	}

}