"use client";

import Link from "next/link";
import { signIn } from "next-auth/react";
import { useTranslations } from "next-intl";
import { type FormEvent, useState } from "react";
import { precheckLogin } from "@/actions/auth-precheck";
import { ContentCard } from "@/components/public/ui";

export default function LoginPage() {
	const t = useTranslations("pages.login");
	const [username, setUsername] = useState("");
	const [password, setPassword] = useState("");
	const [code, setCode] = useState("");
	const [needs2fa, setNeeds2fa] = useState(false);
	const [error, setError] = useState<string | null>(null);
	const [pending, setPending] = useState(false);

	async function onSubmit(e: FormEvent) {
		e.preventDefault();
		setError(null);
		setPending(true);
		try {
			if (!needs2fa) {
				const pre = await precheckLogin(username, password);
				if (pre === "invalid") {
					setError(t("errorInvalidCredentials"));
					return;
				}
				if (pre === "twofactor") {
					setNeeds2fa(true);
					return;
				}
			}
			const res = await signIn("credentials", {
				username,
				password,
				code,
				redirect: false,
			});
			if (!res || res.error) {
				setError(
					needs2fa ? t("errorInvalid2fa") : t("errorInvalidCredentials"),
				);
				return;
			}
			window.location.href = "/";
		} finally {
			setPending(false);
		}
	}

	return (
		<main style={{ maxWidth: 420, margin: "2rem auto" }}>
			<ContentCard
				icon={needs2fa ? "🔒" : "🔑"}
				title={t("title")}
				subtitle={needs2fa ? t("subtitle2fa") : t("subtitle")}
			>
				<form onSubmit={onSubmit} style={{ display: "grid", gap: "0.7rem" }}>
					<input
						value={username}
						onChange={(e) => setUsername(e.target.value)}
						placeholder={t("usernamePlaceholder")}
						autoComplete="username"
						disabled={needs2fa}
					/>
					<input
						type="password"
						value={password}
						onChange={(e) => setPassword(e.target.value)}
						placeholder={t("passwordPlaceholder")}
						autoComplete="current-password"
						disabled={needs2fa}
					/>
					{needs2fa ? (
						<input
							value={code}
							onChange={(e) => setCode(e.target.value)}
							placeholder={t("codePlaceholder")}
							inputMode="numeric"
							autoComplete="one-time-code"
							// biome-ignore lint/a11y/noAutofocus: focus the only relevant field in the 2FA step
							autoFocus
						/>
					) : null}
					<button type="submit" className="btn btn-primary" disabled={pending}>
						{pending ? t("pleaseWait") : needs2fa ? t("verify") : t("signIn")}
					</button>
				</form>

				{!needs2fa ? (
					<>
						<div
							style={{
								display: "flex",
								alignItems: "center",
								gap: "0.5rem",
								margin: "1rem 0",
							}}
						>
							<span
								style={{
									flex: 1,
									height: 1,
									background: "var(--border-color)",
								}}
							/>
							<span className="muted">{t("or")}</span>
							<span
								style={{
									flex: 1,
									height: 1,
									background: "var(--border-color)",
								}}
							/>
						</div>
						<div style={{ display: "grid", gap: "0.5rem" }}>
							<button
								type="button"
								className="btn btn-outline"
								onClick={() => signIn("discord", { callbackUrl: "/" })}
							>
								{t("continueWithDiscord")}
							</button>
							<button
								type="button"
								className="btn btn-outline"
								onClick={() => signIn("google", { callbackUrl: "/" })}
							>
								{t("continueWithGoogle")}
							</button>
						</div>
					</>
				) : null}

				{error ? (
					<p
						style={{
							color: "var(--color-danger)",
							textAlign: "center",
							marginBottom: 0,
						}}
					>
						{error}
					</p>
				) : null}
				<p
					className="muted"
					style={{ textAlign: "center", marginBottom: 0, marginTop: "1rem" }}
				>
					{t("noAccount")} <Link href="/register">{t("createOne")}</Link> ·{" "}
					<Link href="/forgot">{t("forgotPassword")}</Link>
				</p>
			</ContentCard>
		</main>
	);
}