import {
	createRootRoute,
	type ErrorComponentProps,
	Outlet,
	useLocation,
	useMatchRoute,
	useNavigate,
	useRouter,
} from "@tanstack/react-router";
import { useEffect, useState } from "react";
import { useTranslation } from "react-i18next";
import { Toaster } from "sonner";
import "../app.css";
import { AddToCollectionModal } from "../components/AddToCollectionModal";
import { AddToThreadModal } from "../components/AddToThreadModal";
import { AuthPromptModal } from "../components/AuthPromptModal";
import { BottomTabBar } from "../components/BottomTabBar";
import { CatalogSearchOverlay } from "../components/CatalogSearchOverlay";
import { ConfirmDialog } from "../components/ConfirmDialog";
import { ExternalLinkDialog } from "../components/ExternalLinkDialog";
import { FabMenu } from "../components/FabMenu";
import { OnboardingFlow } from "../components/onboarding/OnboardingFlow";
import { TopNav } from "../components/TopNav";
import { useAuth } from "../hooks/useAuth";
import { useDeleteCandidate } from "../hooks/useCandidates";
import { useLanguage } from "../hooks/useLanguage";
import { useOnboardingComplete } from "../hooks/useSettings";
import { useResolveThread, useThread } from "../hooks/useThreads";
import { useUIStore } from "../stores/uiStore";

export const Route = createRootRoute({
	component: RootLayout,
	errorComponent: RootErrorBoundary,
});

function RootErrorBoundary({ error, reset }: ErrorComponentProps) {
	const router = useRouter();
	const { t } = useTranslation();

	return (
		<div className="min-h-screen bg-gray-50 flex items-center justify-center">
			<div className="max-w-md mx-auto text-center px-4">
				<div className="w-12 h-12 bg-red-100 rounded-full flex items-center justify-center mx-auto mb-4">
					<svg
						className="w-6 h-6 text-red-600"
						fill="none"
						stroke="currentColor"
						viewBox="0 0 24 24"
					>
						<path
							strokeLinecap="round"
							strokeLinejoin="round"
							strokeWidth={2}
							d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.964-.833-2.732 0L4.082 16.5c-.77.833.192 2.5 1.732 2.5z"
						/>
					</svg>
				</div>
				<h1 className="text-xl font-semibold text-gray-900 mb-2">
					{t("errors.somethingWentWrong")}
				</h1>
				<p className="text-sm text-gray-500 mb-6">
					{error instanceof Error ? error.message : t("errors.unexpectedError")}
				</p>
				<button
					type="button"
					onClick={() => {
						reset();
						router.invalidate();
					}}
					className="px-5 py-2.5 bg-gray-700 hover:bg-gray-800 text-white text-sm font-medium rounded-lg transition-colors"
				>
					{t("actions.tryAgain")}
				</button>
			</div>
		</div>
	);
}

function RootLayout() {
	const navigate = useNavigate();
	const location = useLocation();
	const { data: auth, isLoading: authLoading } = useAuth();
	const isAuthenticated = !!auth?.user;
	const language = useLanguage();
	const { i18n } = useTranslation();

	// Sync i18n language with persisted setting
	useEffect(() => {
		if (language && i18n.language !== language) {
			i18n.changeLanguage(language);
		}
	}, [language, i18n]);

	// Candidate delete state
	const confirmDeleteCandidateId = useUIStore(
		(s) => s.confirmDeleteCandidateId,
	);
	const closeConfirmDeleteCandidate = useUIStore(
		(s) => s.closeConfirmDeleteCandidate,
	);

	// Resolution dialog state
	const resolveThreadId = useUIStore((s) => s.resolveThreadId);
	const resolveCandidateId = useUIStore((s) => s.resolveCandidateId);
	const closeResolveDialog = useUIStore((s) => s.closeResolveDialog);

	// Onboarding — only check when authenticated (endpoint requires auth)
	const { data: onboardingComplete, isLoading: onboardingLoading } =
		useOnboardingComplete(isAuthenticated);
	const [wizardDismissed, setWizardDismissed] = useState(false);

	// Don't show onboarding wizard until user has created an account
	const showWizard =
		!onboardingLoading &&
		onboardingComplete !== "true" &&
		!wizardDismissed &&
		isAuthenticated;

	// Route matching for contextual behavior
	const matchRoute = useMatchRoute();

	const threadMatch = matchRoute({
		to: "/threads/$threadId",
		fuzzy: true,
	}) as { threadId?: string } | false;
	const currentThreadId = threadMatch ? Number(threadMatch.threadId) : null;

	// Allow public routes through without auth
	const isPublicRoute =
		location.pathname === "/" ||
		location.pathname.startsWith("/users/") ||
		location.pathname.startsWith("/global-items") ||
		location.pathname === "/setups" ||
		location.pathname.startsWith("/setups/") ||
		location.pathname === "/login";

	// FAB visibility: show on all authenticated, non-public routes
	const isSetupsPage = !!matchRoute({ to: "/setups", fuzzy: true });
	const showFab = isAuthenticated && !isPublicRoute;

	if (!isAuthenticated && !isPublicRoute && !authLoading) {
		navigate({ to: "/login" });
		return null;
	}

	return (
		<div className="min-h-screen bg-gray-50 pb-16 md:pb-0">
			<TopNav />
			<Outlet />

			{/* Item Confirm Delete Dialog */}
			<ConfirmDialog />

			{/* External Link Confirmation Dialog */}
			<ExternalLinkDialog />

			{/* Candidate Delete Confirm Dialog */}
			{confirmDeleteCandidateId != null && currentThreadId != null && (
				<CandidateDeleteDialog
					candidateId={confirmDeleteCandidateId}
					threadId={currentThreadId}
					onClose={closeConfirmDeleteCandidate}
				/>
			)}

			{/* Resolution Confirm Dialog */}
			{resolveThreadId != null && resolveCandidateId != null && (
				<ResolveDialog
					threadId={resolveThreadId}
					candidateId={resolveCandidateId}
					onClose={closeResolveDialog}
					onResolved={() => {
						closeResolveDialog();
						navigate({ to: "/collection", search: { tab: "planning" } });
					}}
				/>
			)}

			{/* Floating Action Button */}
			{showFab && (
				<div className="hidden md:block">
					<FabMenu isSetupsPage={isSetupsPage} />
				</div>
			)}

			{/* Bottom Tab Bar (mobile only) */}
			<BottomTabBar />

			{/* Catalog Search Overlay */}
			<CatalogSearchOverlay />

			{/* Add to Collection Modal */}
			<AddToCollectionModal />
			{/* Add to Thread Modal */}
			<AddToThreadModal />
			<Toaster position="bottom-right" richColors />

			{/* Auth Prompt Modal */}
			<AuthPromptModal />

			{/* Onboarding Flow */}
			{showWizard && (
				<OnboardingFlow onComplete={() => setWizardDismissed(true)} />
			)}
		</div>
	);
}

function CandidateDeleteDialog({
	candidateId,
	threadId,
	onClose,
}: {
	candidateId: number;
	threadId: number;
	onClose: () => void;
}) {
	const { t } = useTranslation();
	const deleteCandidate = useDeleteCandidate(threadId);
	const { data: thread } = useThread(threadId);
	const candidate = thread?.candidates.find((c) => c.id === candidateId);
	const candidateName = candidate?.name ?? "this candidate";

	function handleDelete() {
		deleteCandidate.mutate(candidateId, {
			onSuccess: () => onClose(),
		});
	}

	return (
		<div className="fixed inset-0 z-50 flex items-center justify-center">
			<div
				className="absolute inset-0 bg-black/30"
				onClick={onClose}
				onKeyDown={(e) => {
					if (e.key === "Escape") onClose();
				}}
			/>
			<div className="relative bg-white rounded-xl shadow-lg p-6 max-w-sm mx-4 w-full">
				<h3 className="text-lg font-semibold text-gray-900 mb-2">
					{t("confirm.deleteCandidate")}
				</h3>
				<p className="text-sm text-gray-600 mb-6">
					{t("confirm.deleteCandidateMessage", { name: candidateName })}
				</p>
				<div className="flex justify-end gap-3">
					<button
						type="button"
						onClick={onClose}
						className="px-4 py-2 text-sm font-medium text-gray-700 bg-gray-100 hover:bg-gray-200 rounded-lg transition-colors"
					>
						{t("actions.cancel")}
					</button>
					<button
						type="button"
						onClick={handleDelete}
						disabled={deleteCandidate.isPending}
						className="px-4 py-2 text-sm font-medium text-white bg-red-600 hover:bg-red-700 disabled:opacity-50 rounded-lg transition-colors"
					>
						{deleteCandidate.isPending
							? t("actions.deleting")
							: t("actions.delete")}
					</button>
				</div>
			</div>
		</div>
	);
}

function ResolveDialog({
	threadId,
	candidateId,
	onClose,
	onResolved,
}: {
	threadId: number;
	candidateId: number;
	onClose: () => void;
	onResolved: () => void;
}) {
	const { t } = useTranslation();
	const resolveThread = useResolveThread();
	const { data: thread } = useThread(threadId);
	const candidate = thread?.candidates.find((c) => c.id === candidateId);
	const candidateName = candidate?.name ?? "this candidate";

	function handleResolve() {
		resolveThread.mutate(
			{ threadId, candidateId },
			{ onSuccess: () => onResolved() },
		);
	}

	return (
		<div className="fixed inset-0 z-50 flex items-center justify-center">
			<div
				className="absolute inset-0 bg-black/30"
				onClick={onClose}
				onKeyDown={(e) => {
					if (e.key === "Escape") onClose();
				}}
			/>
			<div className="relative bg-white rounded-xl shadow-lg p-6 max-w-sm mx-4 w-full">
				<h3 className="text-lg font-semibold text-gray-900 mb-2">
					{t("confirm.pickWinner")}
				</h3>
				<p className="text-sm text-gray-600 mb-6">
					{t("confirm.pickWinnerMessage", { name: candidateName })}
				</p>
				<div className="flex justify-end gap-3">
					<button
						type="button"
						onClick={onClose}
						className="px-4 py-2 text-sm font-medium text-gray-700 bg-gray-100 hover:bg-gray-200 rounded-lg transition-colors"
					>
						{t("actions.cancel")}
					</button>
					<button
						type="button"
						onClick={handleResolve}
						disabled={resolveThread.isPending}
						className="px-4 py-2 text-sm font-medium text-white bg-amber-600 hover:bg-amber-700 disabled:opacity-50 rounded-lg transition-colors"
					>
						{resolveThread.isPending
							? t("actions.saving")
							: t("confirm.pickWinner")}
					</button>
				</div>
			</div>
		</div>
	);
}