"use client";
import { RiFingerprintLine, RiLoader4Line } from "@remixicon/react";
import { useRouter } from "next/navigation";
import { type FormEvent, useEffect, useState } from "react";
import { toast } from "sonner";
import { Button } from "@/components/ui/button";
import { Card, CardContent } from "@/components/ui/card";
import {
	Field,
	FieldDescription,
	FieldGroup,
	FieldLabel,
	FieldSeparator,
} from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import { authClient, googleSignInAvailable } from "@/lib/auth/client";
import { cn } from "@/lib/utils/ui";
import { Logo } from "../logo";
import { AuthErrorAlert } from "./auth-error-alert";
import { AuthHeader } from "./auth-header";
import AuthSidebar from "./auth-sidebar";
import { GoogleAuthButton } from "./google-auth-button";

type DivProps = React.ComponentProps<"div">;

export function LoginForm({ className, ...props }: DivProps) {
	const router = useRouter();
	const isGoogleAvailable = googleSignInAvailable;

	const [email, setEmail] = useState("");
	const [password, setPassword] = useState("");

	const [error, setError] = useState("");
	const [loadingEmail, setLoadingEmail] = useState(false);
	const [loadingGoogle, setLoadingGoogle] = useState(false);
	const [loadingPasskey, setLoadingPasskey] = useState(false);
	const [passkeySupported, setPasskeySupported] = useState(false);

	useEffect(() => {
		if (typeof window === "undefined") return;
		if (typeof PublicKeyCredential === "undefined") return;

		setPasskeySupported(true);
	}, []);

	async function handleSubmit(e: FormEvent<HTMLFormElement>) {
		e.preventDefault();

		await authClient.signIn.email(
			{
				email,
				password,
				callbackURL: "/dashboard",
				rememberMe: false,
			},
			{
				onRequest: () => {
					setError("");
					setLoadingEmail(true);
				},
				onSuccess: () => {
					setLoadingEmail(false);
					toast.success("Login realizado com sucesso!");
					router.replace("/dashboard");
				},
				onError: (ctx) => {
					if (
						ctx.error.status === 500 &&
						ctx.error.statusText === "Internal Server Error"
					) {
						toast.error(
							"Ocorreu uma falha na requisição. Tente novamente mais tarde.",
						);
					}

					setError(ctx.error.message);
					setLoadingEmail(false);
				},
			},
		);
	}

	async function handleGoogle() {
		if (!isGoogleAvailable) {
			setError("Login com Google não está disponível no momento.");
			return;
		}

		// Ativa loading antes de iniciar o fluxo OAuth
		setError("");
		setLoadingGoogle(true);

		// OAuth redirect - o loading permanece até a página ser redirecionada
		await authClient.signIn.social(
			{
				provider: "google",
				callbackURL: "/dashboard",
			},
			{
				onError: (ctx) => {
					// Só desativa loading se houver erro
					setError(ctx.error.message);
					setLoadingGoogle(false);
				},
			},
		);
	}

	async function handlePasskey() {
		setError("");
		setLoadingPasskey(true);

		const { error: passkeyError } = await authClient.signIn.passkey({
			fetchOptions: {
				onSuccess: () => {
					setLoadingPasskey(false);
					router.replace("/dashboard");
				},
				onError: (ctx) => {
					setError(ctx.error.message);
					setLoadingPasskey(false);
				},
			},
		});

		if (passkeyError) {
			setError(passkeyError.message || "Erro ao entrar com passkey.");
			setLoadingPasskey(false);
		}
	}

	return (
		<div className={cn("flex flex-col gap-6", className)} {...props}>
			<Logo className="mb-2" />
			<Card className="overflow-hidden p-0">
				<CardContent className="grid gap-0 p-0 md:grid-cols-[1.05fr_0.95fr]">
					<form
						className="flex flex-col gap-6 p-6 md:p-8"
						onSubmit={handleSubmit}
						noValidate
					>
						<FieldGroup className="gap-4">
							<AuthHeader title="Entrar no OpenMonetis" />

							<AuthErrorAlert error={error} />

							<Field>
								<FieldLabel htmlFor="email">E-mail</FieldLabel>
								<Input
									id="email"
									type="email"
									placeholder="Digite seu e-mail"
									autoComplete="username webauthn"
									required
									value={email}
									onChange={(e) => setEmail(e.target.value)}
									aria-invalid={!!error}
								/>
							</Field>

							<Field>
								<div className="flex items-center">
									<FieldLabel htmlFor="password">Senha</FieldLabel>
								</div>
								<Input
									id="password"
									type="password"
									required
									placeholder="Digite sua senha"
									autoComplete="current-password"
									value={password}
									onChange={(e) => setPassword(e.target.value)}
									aria-invalid={!!error}
								/>
							</Field>

							<Field>
								<Button
									type="submit"
									disabled={loadingEmail || loadingGoogle || loadingPasskey}
									className="w-full"
								>
									{loadingEmail ? (
										<RiLoader4Line className="h-4 w-4 animate-spin" />
									) : (
										"Entrar"
									)}
								</Button>
							</Field>

							<FieldSeparator className="my-2 *:data-[slot=field-separator-content]:bg-card">
								Ou continue com
							</FieldSeparator>

							<Field>
								<GoogleAuthButton
									onClick={handleGoogle}
									loading={loadingGoogle}
									disabled={
										loadingEmail ||
										loadingGoogle ||
										loadingPasskey ||
										!isGoogleAvailable
									}
									text="Entrar com Google"
								/>
							</Field>

							{passkeySupported && (
								<Field>
									<Button
										variant="outline"
										type="button"
										onClick={handlePasskey}
										disabled={loadingEmail || loadingGoogle || loadingPasskey}
										className="w-full gap-2"
									>
										{loadingPasskey ? (
											<RiLoader4Line className="h-4 w-4 animate-spin" />
										) : (
											<RiFingerprintLine className="h-5 w-5" />
										)}
										<span>Entrar com passkey</span>
									</Button>
								</Field>
							)}

							<FieldDescription className="text-center">
								Não tem uma conta?{" "}
								<a href="/signup" className="underline underline-offset-4">
									Inscreva-se
								</a>
							</FieldDescription>
						</FieldGroup>
					</form>

					<AuthSidebar />
				</CardContent>
			</Card>

			<FieldDescription className="text-center">
				<a href="/" className="underline underline-offset-4">
					Voltar para o site
				</a>
			</FieldDescription>
		</div>
	);
}