import {
	AlertTriangle,
	CheckCircle2,
	FolderSearch,
	Gamepad2,
	Library,
	Loader2,
	RefreshCw,
	Save,
} from "lucide-react";
import { type ReactNode, useEffect, useState } from "react";
import {
	type Config,
	getConfig,
	putConfig,
	runSync,
	type Status,
	useStatusStream,
} from "./api.js";

const relTime = (ms?: number): string => {
	if (!ms) return "never";
	const s = Math.round((Date.now() - ms) / 1000);
	if (s < 60) return `${s}s ago`;
	if (s < 3600) return `${Math.round(s / 60)}m ago`;
	if (s < 86400) return `${Math.round(s / 3600)}h ago`;
	return `${Math.round(s / 86400)}d ago`;
};

function Card({
	title,
	icon,
	children,
	right,
}: {
	title: string;
	icon: ReactNode;
	children: ReactNode;
	right?: ReactNode;
}) {
	return (
		<section className="rounded-[var(--radius)] border border-border bg-card p-5">
			<header className="mb-4 flex items-center justify-between gap-3">
				<h2 className="flex items-center gap-2 text-sm font-semibold tracking-wide text-muted uppercase">
					<span className="text-brand">{icon}</span>
					{title}
				</h2>
				{right}
			</header>
			{children}
		</section>
	);
}

function Toggle({
	label,
	hint,
	checked,
	onChange,
}: {
	label: string;
	hint?: string;
	checked: boolean;
	onChange: (v: boolean) => void;
}) {
	return (
		<label className="flex cursor-pointer items-start justify-between gap-4 py-2">
			<span>
				<span className="block text-sm">{label}</span>
				{hint && <span className="block text-xs text-muted">{hint}</span>}
			</span>
			<button
				type="button"
				onClick={() => onChange(!checked)}
				className={`mt-0.5 h-6 w-11 shrink-0 rounded-full transition-colors ${checked ? "bg-brand" : "bg-elevated"}`}
			>
				<span
					className={`block h-5 w-5 rounded-full bg-white transition-transform ${checked ? "translate-x-5" : "translate-x-0.5"}`}
				/>
			</button>
		</label>
	);
}

const inputCls =
	"w-full rounded-lg border border-border bg-surface px-3 py-2 text-sm outline-none focus:border-brand";

export function App() {
	const status = useStatusStream();
	const [config, setConfig] = useState<Config>();
	const [saving, setSaving] = useState(false);
	const [syncing, setSyncing] = useState(false);
	const [msg, setMsg] = useState<string>();

	useEffect(() => {
		getConfig()
			.then(setConfig)
			.catch((e) => setMsg(String(e)));
	}, []);

	const patch = (p: Partial<Config>) =>
		setConfig((c) => (c ? { ...c, ...p } : c));

	const save = async () => {
		if (!config) return;
		setSaving(true);
		setMsg(undefined);
		try {
			setConfig(await putConfig(config));
			setMsg("Saved — re-syncing with the new settings.");
		} catch (e) {
			setMsg(String(e));
		} finally {
			setSaving(false);
		}
	};

	const sync = async () => {
		setSyncing(true);
		setMsg(undefined);
		try {
			await runSync();
			setMsg("Sync requested.");
		} catch (e) {
			setMsg(String(e));
		} finally {
			setSyncing(false);
		}
	};

	return (
		<div className="mx-auto max-w-3xl px-5 py-8">
			<header className="mb-6 flex items-center gap-3">
				<span className="grid h-10 w-10 place-items-center rounded-xl bg-brand text-brand-fg">
					<Gamepad2 size={22} />
				</span>
				<div>
					<h1 className="text-xl font-semibold">Playnite</h1>
					<p className="text-xs text-muted">
						Sync your Playnite library into the Punktfunk game library.
					</p>
				</div>
			</header>

			{status ? (
				<div className="grid gap-5">
					<Connection status={status} />
					<LibrarySummary status={status} onSync={sync} syncing={syncing} />
					{config && (
						<Settings
							config={config}
							patch={patch}
							onSave={save}
							saving={saving}
						/>
					)}
				</div>
			) : (
				<p className="text-sm text-muted">Loading…</p>
			)}

			{msg && (
				<p className="mt-5 rounded-lg border border-border bg-surface px-4 py-2 text-sm text-muted">
					{msg}
				</p>
			)}
		</div>
	);
}

function Connection({ status }: { status: Status }) {
	const found = Boolean(status.location.file);
	return (
		<Card title="Playnite connection" icon={<FolderSearch size={16} />}>
			{found ? (
				<div className="flex items-start gap-3">
					<CheckCircle2 className="mt-0.5 shrink-0 text-ok" size={18} />
					<div className="min-w-0 text-sm">
						<p>
							Exporter connected — updated{" "}
							<span className="text-fg">
								{relTime(status.location.mtime ?? undefined)}
							</span>
							.
						</p>
						<p className="mt-1 truncate font-mono text-xs text-muted">
							{status.location.file}
						</p>
					</div>
				</div>
			) : (
				<div className="flex items-start gap-3">
					<AlertTriangle className="mt-0.5 shrink-0 text-warn" size={18} />
					<div className="text-sm">
						<p>
							No exporter output found. Install the{" "}
							<span className="text-fg">Punktfunk Sync</span> extension in
							Playnite (then restart Playnite).
						</p>
						{status.exportError && (
							<p className="mt-1 text-xs text-muted">{status.exportError}</p>
						)}
						<p className="mt-2 text-xs text-muted">
							Looked under:{" "}
							{status.location.dir ?? "no Playnite data dir found"}
						</p>
					</div>
				</div>
			)}
		</Card>
	);
}

function LibrarySummary({
	status,
	onSync,
	syncing,
}: {
	status: Status;
	onSync: () => void;
	syncing: boolean;
}) {
	const report = status.lastReport;
	const busy = syncing || status.syncing;
	const sources = report
		? Object.entries(report.perSource).sort((a, b) => b[1] - a[1])
		: [];
	return (
		<Card
			title="Library"
			icon={<Library size={16} />}
			right={
				<button
					type="button"
					onClick={onSync}
					disabled={busy}
					className="flex items-center gap-2 rounded-lg bg-brand px-3 py-1.5 text-sm font-medium text-brand-fg hover:bg-brand-hover disabled:opacity-50"
				>
					{busy ? (
						<Loader2 className="animate-spin" size={15} />
					) : (
						<RefreshCw size={15} />
					)}
					Sync now
				</button>
			}
		>
			<div className="flex items-baseline gap-2">
				<span className="text-3xl font-semibold">
					{status.lastSync?.count ?? 0}
				</span>
				<span className="text-sm text-muted">
					title(s) synced · last {relTime(status.lastSync?.at)}
				</span>
			</div>
			{sources.length > 0 && (
				<div className="mt-3 flex flex-wrap gap-2">
					{sources.map(([src, n]) => (
						<span
							key={src}
							className="rounded-full border border-border bg-surface px-2.5 py-1 text-xs"
						>
							{src} <span className="text-muted">{n}</span>
						</span>
					))}
				</div>
			)}
			{report && report.skipped.length > 0 && (
				<p className="mt-3 text-xs text-muted">
					{report.skipped.length} skipped (e.g. {report.skipped[0]?.title}:{" "}
					{report.skipped[0]?.reason})
				</p>
			)}
			{report?.warnings.map((w) => (
				<p key={w} className="mt-2 text-xs text-warn">
					{w}
				</p>
			))}
		</Card>
	);
}

function Settings({
	config,
	patch,
	onSave,
	saving,
}: {
	config: Config;
	patch: (p: Partial<Config>) => void;
	onSave: () => void;
	saving: boolean;
}) {
	const csv = (a: string[]) => a.join(", ");
	const parseCsv = (s: string) =>
		s
			.split(",")
			.map((x) => x.trim())
			.filter(Boolean);

	return (
		<Card
			title="Settings"
			icon={<Gamepad2 size={16} />}
			right={
				<button
					type="button"
					onClick={onSave}
					disabled={saving}
					className="flex items-center gap-2 rounded-lg border border-border bg-surface px-3 py-1.5 text-sm hover:bg-elevated disabled:opacity-50"
				>
					{saving ? (
						<Loader2 className="animate-spin" size={15} />
					) : (
						<Save size={15} />
					)}
					Save
				</button>
			}
		>
			<div className="divide-y divide-border">
				<Toggle
					label="Installed games only"
					hint="Uncheck to also sync games Playnite hasn't installed yet."
					checked={config.filter.installedOnly}
					onChange={(v) =>
						patch({ filter: { ...config.filter, installedOnly: v } })
					}
				/>
				<Toggle
					label="Include hidden games"
					checked={config.filter.includeHidden}
					onChange={(v) =>
						patch({ filter: { ...config.filter, includeHidden: v } })
					}
				/>
				<Toggle
					label="Embed cover art"
					hint="Inlines each cover as a data URL. Turn off for a lighter library payload."
					checked={config.art.mode === "dataurl"}
					onChange={(v) =>
						patch({ art: { ...config.art, mode: v ? "dataurl" : "off" } })
					}
				/>
				<Toggle
					label="Embed background art too"
					hint="Backgrounds are large — off by default."
					checked={config.art.includeBackground}
					onChange={(v) =>
						patch({ art: { ...config.art, includeBackground: v } })
					}
				/>
			</div>

			<div className="mt-4 grid gap-3">
				<label className="block">
					<span className="mb-1 block text-xs text-muted">
						Only these sources (comma-separated, blank = all)
					</span>
					<input
						className={inputCls}
						placeholder="Steam, GOG, Epic"
						defaultValue={csv(config.filter.sources)}
						onBlur={(e) =>
							patch({
								filter: { ...config.filter, sources: parseCsv(e.target.value) },
							})
						}
					/>
				</label>
				<label className="block">
					<span className="mb-1 block text-xs text-muted">Exclude sources</span>
					<input
						className={inputCls}
						placeholder="Xbox"
						defaultValue={csv(config.filter.excludeSources)}
						onBlur={(e) =>
							patch({
								filter: {
									...config.filter,
									excludeSources: parseCsv(e.target.value),
								},
							})
						}
					/>
				</label>
				<div className="grid grid-cols-2 gap-3">
					<label className="block">
						<span className="mb-1 block text-xs text-muted">
							Poll every (min)
						</span>
						<input
							type="number"
							min={1}
							className={inputCls}
							defaultValue={config.sync.pollMinutes}
							onBlur={(e) =>
								patch({
									sync: {
										...config.sync,
										pollMinutes: Math.max(1, Number(e.target.value) || 5),
									},
								})
							}
						/>
					</label>
					<label className="block">
						<span className="mb-1 block text-xs text-muted">
							Playnite dir override
						</span>
						<input
							className={inputCls}
							placeholder="(auto-detect)"
							defaultValue={config.playniteDir ?? ""}
							onBlur={(e) =>
								patch({ playniteDir: e.target.value.trim() || undefined })
							}
						/>
					</label>
				</div>
			</div>
		</Card>
	);
}