import { RotateCorner, toDomPrecision } from '@tldraw/primitives'
import classNames from 'classnames'
import { useRef } from 'react'
import { track } from 'signia-react'
import { useApp } from '../hooks/useApp'
import { getCursor } from '../hooks/useCursor'
import { useSelectionEvents } from '../hooks/useSelectionEvents'
import { useTransform } from '../hooks/useTransform'
import { CropHandles } from './CropHandles'

const IS_FIREFOX =
	typeof navigator !== 'undefined' &&
	navigator.userAgent &&
	navigator.userAgent.toLowerCase().indexOf('firefox') > -1

export const SelectionFg = track(function SelectionFg() {
	const app = useApp()
	const rSvg = useRef<SVGSVGElement>(null)

	const isReadonlyMode = app.isReadOnly
	const topEvents = useSelectionEvents('top')
	const rightEvents = useSelectionEvents('right')
	const bottomEvents = useSelectionEvents('bottom')
	const leftEvents = useSelectionEvents('left')
	const topLeftEvents = useSelectionEvents('top_left')
	const topRightEvents = useSelectionEvents('top_right')
	const bottomRightEvents = useSelectionEvents('bottom_right')
	const bottomLeftEvents = useSelectionEvents('bottom_left')

	const isDefaultCursor = !app.isMenuOpen && app.cursor.type === 'default'
	const isCoarsePointer = app.isCoarsePointer

	let bounds = app.selectionBounds
	const shapes = app.selectedShapes
	const onlyShape = shapes.length === 1 ? shapes[0] : null

	// if all shapes have an expandBy for the selection outline, we can expand by the l
	const expandOutlineBy = onlyShape
		? app.getShapeUtil(onlyShape).expandSelectionOutlinePx(onlyShape)
		: 0

	useTransform(rSvg, bounds?.x, bounds?.y, 1, app.selectionRotation, {
		x: -expandOutlineBy,
		y: -expandOutlineBy,
	})

	if (!bounds) return null
	bounds = bounds.clone().expandBy(expandOutlineBy)

	const zoom = app.zoomLevel
	const rotation = app.selectionRotation
	const isChangingStyles = app.isChangingStyle

	const width = Math.max(1, bounds.width)
	const height = Math.max(1, bounds.height)

	const size = 8 / zoom
	const isTinyX = width < size * 2
	const isTinyY = height < size * 2

	const isSmallX = width < size * 4
	const isSmallY = height < size * 4
	const isSmallCropX = width < size * 5
	const isSmallCropY = height < size * 5

	const mobileHandleMultiplier = isCoarsePointer ? 1.75 : 1
	const targetSize = (6 / zoom) * mobileHandleMultiplier

	const targetSizeX = (isSmallX ? targetSize / 2 : targetSize) * (mobileHandleMultiplier * 0.75)
	const targetSizeY = (isSmallY ? targetSize / 2 : targetSize) * (mobileHandleMultiplier * 0.75)

	const showSelectionBounds =
		(onlyShape ? !app.getShapeUtil(onlyShape).hideSelectionBoundsFg(onlyShape) : true) &&
		!isChangingStyles

	let shouldDisplayBox =
		(showSelectionBounds &&
			app.isInAny(
				'select.idle',
				'select.brushing',
				'select.scribble_brushing',
				'select.pointing_canvas',
				'select.pointing_selection',
				'select.pointing_shape',
				'select.crop.idle',
				'select.crop.pointing_crop',
				'select.pointing_resize_handle',
				'select.pointing_crop_handle',
				'select.editing_shape'
			)) ||
		(showSelectionBounds && app.isIn('select.resizing') && onlyShape && shapes[0].type === 'text')

	if (IS_FIREFOX && shouldDisplayBox) {
		if (app.onlySelectedShape?.type === 'embed') {
			shouldDisplayBox = false
		}
	}

	const showCropHandles =
		app.isInAny('select.pointing_crop_handle', 'select.crop.idle', 'select.crop.pointing_crop') &&
		!isChangingStyles &&
		!isReadonlyMode

	const shouldDisplayControls =
		app.isInAny(
			'select.idle',
			'select.pointing_selection',
			'select.pointing_shape',
			'select.crop.idle'
		) &&
		!isChangingStyles &&
		!isReadonlyMode

	const showCornerRotateHandles =
		!isCoarsePointer &&
		!(isTinyX || isTinyY) &&
		(shouldDisplayControls || showCropHandles) &&
		(onlyShape ? !app.getShapeUtil(onlyShape).hideRotateHandle(onlyShape) : true)

	const showMobileRotateHandle =
		isCoarsePointer &&
		(!isSmallX || !isSmallY) &&
		(shouldDisplayControls || showCropHandles) &&
		(onlyShape ? !app.getShapeUtil(onlyShape).hideRotateHandle(onlyShape) : true)

	const showResizeHandles =
		shouldDisplayControls &&
		(onlyShape
			? app.getShapeUtil(onlyShape).canResize(onlyShape) &&
			  !app.getShapeUtil(onlyShape).hideResizeHandles(onlyShape)
			: true) &&
		!showCropHandles

	const hideAlternateCornerHandles = isTinyX || isTinyY
	const showOnlyOneHandle = isTinyX && isTinyY
	const hideAlternateCropHandles = isSmallCropX || isSmallCropY

	const showHandles = showResizeHandles || showCropHandles
	const hideRotateCornerHandles = !showCornerRotateHandles
	const hideMobileRotateHandle = !shouldDisplayControls || !showMobileRotateHandle
	const hideTopLeftCorner = !shouldDisplayControls || !showHandles
	const hideTopRightCorner = !shouldDisplayControls || !showHandles || hideAlternateCornerHandles
	const hideBottomLeftCorner = !shouldDisplayControls || !showHandles || hideAlternateCornerHandles
	const hideBottomRightCorner =
		!shouldDisplayControls || !showHandles || (showOnlyOneHandle && !showCropHandles)

	let hideEdgeTargetsDueToCoarsePointer = isCoarsePointer

	if (
		hideEdgeTargetsDueToCoarsePointer &&
		shapes.every((shape) => app.getShapeUtil(shape).isAspectRatioLocked(shape))
	) {
		hideEdgeTargetsDueToCoarsePointer = false
	}

	// If we're showing crop handles, then show the edges too.
	// If we're showing resize handles, then show the edges only
	// if we're not hiding them for some other reason
	let hideEdgeTargets = true

	if (showCropHandles) {
		hideEdgeTargets = hideAlternateCropHandles
	} else if (showResizeHandles) {
		hideEdgeTargets =
			hideAlternateCornerHandles || showOnlyOneHandle || hideEdgeTargetsDueToCoarsePointer
	}

	const textHandleHeight = Math.min(24 / zoom, height - targetSizeY * 3)
	const showTextResizeHandles =
		shouldDisplayControls &&
		isCoarsePointer &&
		onlyShape?.type === 'text' &&
		textHandleHeight * zoom >= 4

	return (
		<svg
			ref={rSvg}
			className="tl-overlays__item tl-selection__fg"
			data-testid="selection-foreground"
		>
			{shouldDisplayBox && (
				<rect
					className={classNames('tl-selection__fg__outline')}
					width={toDomPrecision(width)}
					height={toDomPrecision(height)}
				/>
			)}
			<RotateCornerHandle
				data-testid="selection.rotate.top-left"
				cx={0}
				cy={0}
				targetSize={targetSize}
				corner="top_left_rotate"
				cursor={isDefaultCursor ? getCursor('nwse-rotate', rotation) : undefined}
				isHidden={hideRotateCornerHandles}
			/>
			<RotateCornerHandle
				data-testid="selection.rotate.top-right"
				cx={width + targetSize * 3}
				cy={0}
				targetSize={targetSize}
				corner="top_right_rotate"
				cursor={isDefaultCursor ? getCursor('nesw-rotate', rotation) : undefined}
				isHidden={hideRotateCornerHandles}
			/>
			<RotateCornerHandle
				data-testid="selection.rotate.bottom-left"
				cx={0}
				cy={height + targetSize * 3}
				targetSize={targetSize}
				corner="bottom_left_rotate"
				cursor={isDefaultCursor ? getCursor('swne-rotate', rotation) : undefined}
				isHidden={hideRotateCornerHandles}
			/>
			<RotateCornerHandle
				data-testid="selection.rotate.bottom-right"
				cx={width + targetSize * 3}
				cy={height + targetSize * 3}
				targetSize={targetSize}
				corner="bottom_right_rotate"
				cursor={isDefaultCursor ? getCursor('senw-rotate', rotation) : undefined}
				isHidden={hideRotateCornerHandles}
			/>{' '}
			<MobileRotateHandle
				data-testid="selection.rotate.mobile"
				cx={isSmallX ? -targetSize * 1.5 : width / 2}
				cy={isSmallX ? height / 2 : -targetSize * 1.5}
				size={size}
				isHidden={hideMobileRotateHandle}
			/>
			{/* Targets */}
			<rect
				className={classNames('tl-transparent', {
					'tl-hidden': hideEdgeTargets,
				})}
				data-testid="selection.resize.top"
				aria-label="top target"
				pointerEvents="all"
				x={0}
				y={toDomPrecision(0 - (isSmallY ? targetSizeY * 2 : targetSizeY))}
				width={toDomPrecision(Math.max(1, width))}
				height={toDomPrecision(Math.max(1, targetSizeY * 2))}
				style={isDefaultCursor ? { cursor: getCursor('ns-resize', rotation) } : undefined}
				{...topEvents}
			/>
			<rect
				className={classNames('tl-transparent', {
					'tl-hidden': hideEdgeTargets,
				})}
				data-testid="selection.resize.right"
				aria-label="right target"
				pointerEvents="all"
				x={toDomPrecision(width - (isSmallX ? 0 : targetSizeX))}
				y={0}
				height={toDomPrecision(Math.max(1, height))}
				width={toDomPrecision(Math.max(1, targetSizeX * 2))}
				style={isDefaultCursor ? { cursor: getCursor('ew-resize', rotation) } : undefined}
				{...rightEvents}
			/>
			<rect
				className={classNames('tl-transparent', {
					'tl-hidden': hideEdgeTargets,
				})}
				data-testid="selection.resize.bottom"
				aria-label="bottom target"
				pointerEvents="all"
				x={0}
				y={toDomPrecision(height - (isSmallY ? 0 : targetSizeY))}
				width={toDomPrecision(Math.max(1, width))}
				height={toDomPrecision(Math.max(1, targetSizeY * 2))}
				style={isDefaultCursor ? { cursor: getCursor('ns-resize', rotation) } : undefined}
				{...bottomEvents}
			/>
			<rect
				className={classNames('tl-transparent', {
					'tl-hidden': hideEdgeTargets,
				})}
				data-testid="selection.resize.left"
				aria-label="left target"
				pointerEvents="all"
				x={toDomPrecision(0 - (isSmallX ? targetSizeX * 2 : targetSizeX))}
				y={0}
				height={toDomPrecision(Math.max(1, height))}
				width={toDomPrecision(Math.max(1, targetSizeX * 2))}
				style={isDefaultCursor ? { cursor: getCursor('ew-resize', rotation) } : undefined}
				{...leftEvents}
			/>
			{/* Corner Targets */}
			<rect
				className={classNames('tl-transparent', {
					'tl-hidden': hideTopLeftCorner,
				})}
				data-testid="selection.target.top-left"
				aria-label="top-left target"
				pointerEvents="all"
				x={toDomPrecision(0 - (isSmallX ? targetSizeX * 2 : targetSizeX * 1.5))}
				y={toDomPrecision(0 - (isSmallY ? targetSizeY * 2 : targetSizeY * 1.5))}
				width={toDomPrecision(targetSizeX * 3)}
				height={toDomPrecision(targetSizeY * 3)}
				style={isDefaultCursor ? { cursor: getCursor('nwse-resize', rotation) } : undefined}
				{...topLeftEvents}
			/>
			<rect
				className={classNames('tl-transparent', {
					'tl-hidden': hideTopRightCorner,
				})}
				data-testid="selection.target.top-right"
				aria-label="top-right target"
				pointerEvents="all"
				x={toDomPrecision(width - (isSmallX ? 0 : targetSizeX * 1.5))}
				y={toDomPrecision(0 - (isSmallY ? targetSizeY * 2 : targetSizeY * 1.5))}
				width={toDomPrecision(targetSizeX * 3)}
				height={toDomPrecision(targetSizeY * 3)}
				style={isDefaultCursor ? { cursor: getCursor('nesw-resize', rotation) } : undefined}
				{...topRightEvents}
			/>
			<rect
				className={classNames('tl-transparent', {
					'tl-hidden': hideBottomRightCorner,
				})}
				data-testid="selection.target.bottom-right"
				aria-label="bottom-right target"
				pointerEvents="all"
				x={toDomPrecision(width - (isSmallX ? targetSizeX : targetSizeX * 1.5))}
				y={toDomPrecision(height - (isSmallY ? targetSizeY : targetSizeY * 1.5))}
				width={toDomPrecision(targetSizeX * 3)}
				height={toDomPrecision(targetSizeY * 3)}
				style={isDefaultCursor ? { cursor: getCursor('nwse-resize', rotation) } : undefined}
				{...bottomRightEvents}
			/>
			<rect
				className={classNames('tl-transparent', {
					'tl-hidden': hideBottomLeftCorner,
				})}
				data-testid="selection.target.bottom-left"
				aria-label="bottom-left target"
				pointerEvents="all"
				x={toDomPrecision(0 - (isSmallX ? targetSizeX * 3 : targetSizeX * 1.5))}
				y={toDomPrecision(height - (isSmallY ? 0 : targetSizeY * 1.5))}
				width={toDomPrecision(targetSizeX * 3)}
				height={toDomPrecision(targetSizeY * 3)}
				style={isDefaultCursor ? { cursor: getCursor('nesw-resize', rotation) } : undefined}
				{...bottomLeftEvents}
			/>
			{/* Resize Handles */}
			{showResizeHandles && (
				<>
					<rect
						data-testid="selection.resize.top-left"
						className={classNames('tl-corner-handle', {
							'tl-hidden': hideTopLeftCorner,
						})}
						aria-label="top_left handle"
						x={toDomPrecision(0 - size / 2)}
						y={toDomPrecision(0 - size / 2)}
						width={toDomPrecision(size)}
						height={toDomPrecision(size)}
					/>
					<rect
						data-testid="selection.resize.top-right"
						className={classNames('tl-corner-handle', {
							'tl-hidden': hideTopRightCorner,
						})}
						aria-label="top_right handle"
						x={toDomPrecision(width - size / 2)}
						y={toDomPrecision(0 - size / 2)}
						width={toDomPrecision(size)}
						height={toDomPrecision(size)}
					/>
					<rect
						data-testid="selection.resize.bottom-right"
						className={classNames('tl-corner-handle', {
							'tl-hidden': hideBottomRightCorner,
						})}
						aria-label="bottom_right handle"
						x={toDomPrecision(width - size / 2)}
						y={toDomPrecision(height - size / 2)}
						width={toDomPrecision(size)}
						height={toDomPrecision(size)}
					/>
					<rect
						data-testid="selection.resize.bottom-left"
						className={classNames('tl-corner-handle', {
							'tl-hidden': hideBottomLeftCorner,
						})}
						aria-label="bottom_left handle"
						x={toDomPrecision(0 - size / 2)}
						y={toDomPrecision(height - size / 2)}
						width={toDomPrecision(size)}
						height={toDomPrecision(size)}
					/>
				</>
			)}
			{showTextResizeHandles && (
				<>
					<rect
						data-testid="selection.text-resize.left.handle"
						className="tl-text-handle"
						aria-label="bottom_left handle"
						x={toDomPrecision(0 - size / 4)}
						y={toDomPrecision(height / 2 - textHandleHeight / 2)}
						rx={size / 4}
						width={toDomPrecision(size / 2)}
						height={toDomPrecision(textHandleHeight)}
					/>
					<rect
						data-testid="selection.text-resize.right.handle"
						className="tl-text-handle"
						aria-label="bottom_left handle"
						rx={size / 4}
						x={toDomPrecision(width - size / 4)}
						y={toDomPrecision(height / 2 - textHandleHeight / 2)}
						width={toDomPrecision(size / 2)}
						height={toDomPrecision(textHandleHeight)}
					/>
				</>
			)}
			{/* Crop Handles */}
			{showCropHandles && (
				<CropHandles
					{...{
						size,
						width,
						height,
						hideAlternateHandles: hideAlternateCropHandles,
					}}
				/>
			)}
		</svg>
	)
})

export const RotateCornerHandle = function RotateCornerHandle({
	cx,
	cy,
	targetSize,
	corner,
	cursor,
	isHidden,
	'data-testid': testId,
}: {
	cx: number
	cy: number
	targetSize: number
	corner: RotateCorner
	cursor?: string
	isHidden: boolean
	'data-testid'?: string
}) {
	const events = useSelectionEvents(corner)
	return (
		<rect
			className={classNames('tl-transparent', 'tl-rotate-corner', { 'tl-hidden': isHidden })}
			data-testid={testId}
			aria-label={`${corner} target`}
			pointerEvents="all"
			x={toDomPrecision(cx - targetSize * 3)}
			y={toDomPrecision(cy - targetSize * 3)}
			width={toDomPrecision(Math.max(1, targetSize * 3))}
			height={toDomPrecision(Math.max(1, targetSize * 3))}
			cursor={cursor}
			{...events}
		/>
	)
}

const SQUARE_ROOT_PI = Math.sqrt(Math.PI)

export const MobileRotateHandle = function RotateHandle({
	cx,
	cy,
	size,
	isHidden,
	'data-testid': testId,
}: {
	cx: number
	cy: number
	size: number
	isHidden: boolean
	'data-testid'?: string
}) {
	const events = useSelectionEvents('mobile_rotate')

	return (
		<g>
			<circle
				data-testid={testId}
				pointerEvents="all"
				className={classNames('tl-transparent', 'tl-mobile-rotate__bg', { 'tl-hidden': isHidden })}
				cx={cx}
				cy={cy}
				{...events}
			/>
			<circle
				className={classNames('tl-mobile-rotate__fg', { 'tl-hidden': isHidden })}
				cx={cx}
				cy={cy}
				r={size / SQUARE_ROOT_PI}
			/>
		</g>
	)
}
