import Button from '@material-ui/core/Button';
import { CSSProperties, useEffect, useRef } from 'react';
import { animated, SpringRef, useSpring } from 'react-spring';
import { useDrag } from 'react-use-gesture';

import MenuRoundedIcon from '@material-ui/icons/MenuRounded';
import NavigateBeforeRoundedIcon from '@material-ui/icons/NavigateBeforeRounded';
import NavigateNextRoundedIcon from '@material-ui/icons/NavigateNextRounded';

interface controlsPropsType {
	next: () => void;
	previous: () => void;
	menu: () => void;
}

export function FullScreenControls({ next, previous, menu }: controlsPropsType) {
	return <div className='fullscreenControls posabs a0'>
		<div className='control previous' onClick={previous} />
		<div className='control menu' onClick={menu} />
		<div className='control next' onClick={next} />
	</div>;
}

interface menuBarSpringProps {
	x: number;
	y: number;
	vertical: number;
}
var menuBarPosApi: SpringRef<menuBarSpringProps>;
var mouseX = 0;
var mouseY = 0;
var windowWidth = typeof window !== 'undefined' ? window.innerWidth : 0;
var windowHeight = typeof window !== 'undefined' ? window.innerHeight : 0;
var mouseDown = false;
var positionHistory: [number, number][] = [];
var slopeAverage: [number, number][] = [];
var options = {
	margin: 48, // screen margin
	friction: 0.2, // friction
	edgeForce: 0.4, // force outside margin (inwards to edges)
	centerForce: 0.4, // force inside margin (outwards to edges)
	maxForce: 10, // limit force to not go over this value
	doneTolerance: 0.5, // if movement per frame goes below this value the animation is considered done
	releaseSlopeAverageCount: 3,
};
var lastDrag = 0;
var preventDragClick = (fn: () => void) => Date.now() > lastDrag + 10 && fn();

export function MenuBarControls({ next, previous, menu }: controlsPropsType) {
	var menuBarRef = useRef(null);
	var [menuBarSpring, api] = useSpring(() => ({
		x: windowWidth / 2,
		y: 0,
		vertical: 0,
		config: { mass: 1.6, tension: 300, friction: 20 },
	}));

	useDrag(({ xy: [x, y], last }) => {
		mouseX = x;
		mouseY = y;
		mouseDown = true;
		if (last) {
			mouseDown = false;
			lastDrag = Date.now();
		}
	}, { domTarget: menuBarRef, eventOptions: { passive: false }, threshold: 10 });

	menuBarPosApi = api;

	useEffect(() => {
		var physicsObject = {
			velocity: [0, 0],
			position: [windowWidth / 2, windowHeight],
		};

		function draw() {
			positionHistory.push([mouseX, mouseY]);
			if (positionHistory.length >= options.releaseSlopeAverageCount + 1) positionHistory.shift();

			var box = {
				outer: {
					x: 0,
					y: 0,
					width: windowWidth,
					height: windowHeight,
				},
				inner: {
					x: options.margin,
					y: options.margin,
					width: Math.max(0, windowWidth - 2 * options.margin),
					height: Math.max(0, windowHeight - 2 * options.margin),
				},
			};

			function findCenter(x: number, y: number): [number, number] {
				var ratio = box.inner.width / box.inner.height;
				var coolZone = (Math.abs(ratio - 1) * box.inner.height) / 2;
				var hw = box.inner.width / 2;
				var hh = box.inner.height / 2;

				if (ratio > 1) {
					if (x < hw - coolZone) {
						return [hw - coolZone, hh];
					} else if (x > hw + coolZone) {
						return [hw + coolZone, hh];
					} else {
						return [x, hh];
					}
				} else if (ratio < 1) {
					if (y < hh - coolZone) {
						return [hw, hh - coolZone];
					} else if (y > hh + coolZone) {
						return [hw, hh + coolZone];
					} else {
						return [hw, y];
					}
				} else {
					return [hw, hh];
				}
			}

			var center = findCenter(physicsObject.position[0], physicsObject.position[1]);
			var position = physicsObject.position;

			var slope = (position[1] - center[1]) / (position[0] - center[0]);
			if (Math.abs(slope) < 1) {
				var right = position[0] > center[0];
				if (right) {
					var x = box.inner.x + box.inner.width;
					var y = (x - position[0]) * slope + position[1];
				} else {
					var x = box.inner.x;
					var y = (position[0] - x) * -slope + position[1];
				}
			} else {
				var slope = (position[0] - center[0]) / (position[1] - center[1]);
				var bottom = position[1] > center[1];
				if (bottom) {
					var y = box.inner.y + box.inner.height;
					var x = (y - position[1]) * slope + position[0];
				} else {
					var y = box.inner.y;
					var x = (position[1] - y) * -slope + position[0];
				}
			}
			var offset = [position[0] - x, position[1] - y];
			var outside = position[0] < box.inner.x
				|| position[0] > box.inner.x + box.inner.width
				|| position[1] < box.inner.y
				|| position[1] > box.inner.y + box.inner.height;
			offset = offset.map(o => o * options[outside ? 'edgeForce' : 'centerForce']);
			var distance = Math.sqrt(offset[0] ** 2 + offset[1] ** 2);
			offset = offset.map(o => o * -Math.min(1, options.maxForce / distance));

			if (mouseDown) {
				physicsObject.position = [mouseX, mouseY];
				for (let i = 1; i < positionHistory.length; i++) {
					slopeAverage[i - 1] = [
						positionHistory[i][0] - positionHistory[i - 1][0],
						positionHistory[i][1] - positionHistory[i - 1][1],
					];
				}
				physicsObject.velocity[0] = slopeAverage.reduce((a, b) => a + b[0], 0) / slopeAverage.length;
				physicsObject.velocity[1] = slopeAverage.reduce((a, b) => a + b[1], 0) / slopeAverage.length;
			} else {
				physicsObject.velocity[0] += offset[0];
				physicsObject.velocity[1] += offset[1];
			}

			physicsObject.velocity[0] *= 1 - options.friction;
			physicsObject.velocity[1] *= 1 - options.friction;
			physicsObject.position[0] += physicsObject.velocity[0];
			physicsObject.position[1] += physicsObject.velocity[1];

			var verticalThreshold = 25;
			menuBarPosApi.start({
				x: physicsObject.position[0],
				y: physicsObject.position[1],
				vertical: physicsObject.position[0] <= box.inner.x + verticalThreshold
						|| physicsObject.position[0] >= box.inner.x + box.inner.width - verticalThreshold
					? 1
					: 0,
			});

			requestAnimationFrame(draw);
		}
		draw();
	}, []);

	useEffect(() => {
		function onresize() {
			windowWidth = window.innerWidth;
			windowHeight = window.innerHeight;
		}
		onresize();
		window.addEventListener('resize', onresize);
	}, []);

	return <div className='fullscreenControls posabs a0'>
		<animated.div
			ref={menuBarRef}
			className='menuBar'
			style={{
				'--x': menuBarSpring.x,
				'--y': menuBarSpring.y,
				'--vertical': menuBarSpring.vertical,
			} as CSSProperties}
		>
			<Button
				children={<MenuRoundedIcon />}
				onClick={() => preventDragClick(menu)}
			/>
			<div className='spacing big' />
			<Button
				children={<NavigateBeforeRoundedIcon />}
				onClick={() => preventDragClick(previous)}
			/>
			<div className='spacing small' />
			<Button
				className='big'
				children={<NavigateNextRoundedIcon />}
				onClick={() => preventDragClick(next)}
			/>
		</animated.div>
	</div>;
}