"use client"

import * as React from "react"
import * as SheetPrimitive from "@radix-ui/react-dialog"
import { atom, useAtom } from "jotai"
import { Sheet, SheetPortal, SheetOverlay, SheetTitle, sheetVariants, SheetDescription } from "@/components/ui/sheet"
import { LaIcon } from "../la-icon"
import { cn } from "@/lib/utils"
import { buttonVariants } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import { useKeyboardManager } from "@/hooks/use-keyboard-manager"

export const showShortcutAtom = atom(false)

type ShortcutItem = {
	label: string
	keys: string[]
	then?: string[]
}

type ShortcutSection = {
	title: string
	shortcuts: ShortcutItem[]
}

const SHORTCUTS: ShortcutSection[] = [
	{
		title: "General",
		shortcuts: [
			{ label: "Open command menu", keys: ["⌘", "k"] },
			{ label: "Log out", keys: ["⌥", "⇧", "q"] }
		]
	},
	{
		title: "Navigation",
		shortcuts: [
			{ label: "Go to link", keys: ["G"], then: ["L"] },
			{ label: "Go to page", keys: ["G"], then: ["P"] },
			{ label: "Go to topic", keys: ["G"], then: ["T"] }
		]
	},
	{
		title: "Links",
		shortcuts: [{ label: "Create new link", keys: ["c"] }]
	},
	{
		title: "Pages",
		shortcuts: [{ label: "Create new page", keys: ["p"] }]
	}
]

const ShortcutKey: React.FC<{ keyChar: string }> = ({ keyChar }) => (
	<kbd
		aria-hidden="true"
		className="inline-flex size-5 items-center justify-center rounded border font-sans text-xs capitalize"
	>
		{keyChar}
	</kbd>
)

const ShortcutItem: React.FC<ShortcutItem> = ({ label, keys, then }) => (
	<div className="flex flex-row items-center gap-2">
		<dt className="flex grow items-center">
			<span className="text-muted-foreground text-left text-sm">{label}</span>
		</dt>
		<dd className="flex items-end">
			<span className="text-left">
				<span
					aria-label={keys.join(" ") + (then ? ` then ${then.join(" ")}` : "")}
					className="inline-flex items-center gap-1"
				>
					{keys.map((key, index) => (
						<ShortcutKey key={index} keyChar={key} />
					))}
					{then && (
						<>
							<span className="text-muted-foreground text-xs">then</span>
							{then.map((key, index) => (
								<ShortcutKey key={`then-${index}`} keyChar={key} />
							))}
						</>
					)}
				</span>
			</span>
		</dd>
	</div>
)

const ShortcutSection: React.FC<ShortcutSection> = ({ title, shortcuts }) => (
	<section className="flex flex-col gap-2">
		<h2 className="inline-flex gap-1.5 text-sm">{title}</h2>
		<dl className="m-0 flex flex-col gap-2">
			{shortcuts.map((shortcut, index) => (
				<ShortcutItem key={index} {...shortcut} />
			))}
		</dl>
	</section>
)

export function Shortcut() {
	const [showShortcut, setShowShortcut] = useAtom(showShortcutAtom)
	const [searchQuery, setSearchQuery] = React.useState("")

	const { disableKeydown } = useKeyboardManager("shortcutSection")

	React.useEffect(() => {
		disableKeydown(showShortcut)
	}, [showShortcut, disableKeydown])

	const filteredShortcuts = React.useMemo(() => {
		if (!searchQuery) return SHORTCUTS

		return SHORTCUTS.map(section => ({
			...section,
			shortcuts: section.shortcuts.filter(shortcut => shortcut.label.toLowerCase().includes(searchQuery.toLowerCase()))
		})).filter(section => section.shortcuts.length > 0)
	}, [searchQuery])

	return (
		<Sheet open={showShortcut} onOpenChange={setShowShortcut}>
			<SheetPortal>
				<SheetOverlay className="bg-black/10" />
				<SheetPrimitive.Content
					className={cn(sheetVariants({ side: "right" }), "m-3 h-[calc(100vh-24px)] rounded-md p-0")}
				>
					<header className="flex flex-[0_0_auto] items-center gap-3 px-5 pb-4 pt-5">
						<SheetTitle className="text-base font-medium">Keyboard Shortcuts</SheetTitle>
						<SheetDescription className="sr-only">Quickly navigate around the app</SheetDescription>

						<div className="flex-auto"></div>

						<SheetPrimitive.Close className={cn(buttonVariants({ size: "icon", variant: "ghost" }), "size-6 p-0")}>
							<LaIcon name="X" className="text-muted-foreground size-5" />
							<span className="sr-only">Close</span>
						</SheetPrimitive.Close>
					</header>

					<div className="flex flex-col gap-1 px-5 pb-6">
						<form className="relative flex items-center">
							<LaIcon name="Search" className="text-muted-foreground absolute left-3 size-4" />
							<Input
								autoFocus
								placeholder="Search shortcuts"
								className="border-muted-foreground/50 focus-visible:border-muted-foreground h-10 pl-10 focus-visible:ring-0"
								value={searchQuery}
								onChange={e => setSearchQuery(e.target.value)}
							/>
						</form>
					</div>

					<main className="flex-auto overflow-y-auto overflow-x-hidden [scrollbar-gutter:auto]">
						<div className="px-5 pb-5">
							<div role="region" aria-live="polite" className="flex flex-col gap-7">
								{filteredShortcuts.map((section, index) => (
									<ShortcutSection key={index} {...section} />
								))}
							</div>
						</div>
					</main>
				</SheetPrimitive.Content>
			</SheetPortal>
		</Sheet>
	)
}