import Link from "next/link";
import { getTranslations } from "next-intl/server";
import { redirect } from "next/navigation";
import { beginTwoFactor, confirmTwoFactor, disableTwoFactor } from "@/actions/twofactor";
import { ContentCard } from "@/components/public/ui";
import { LaravelEncrypter } from "@/lib/auth/laravel-encrypter";
import { totpKeyUri } from "@/lib/auth/totp";
import { auth } from "@/lib/auth";
import { prisma } from "@/lib/prisma";
import { siteSettings } from "@/lib/services/site-settings";
import { env } from "@/env";

export const dynamic = "force-dynamic";

export default async function TwoFactorPage({
  searchParams,
}: {
  searchParams: Promise<{ error?: string; enabled?: string; disabled?: string }>;
}) {
  const t = await getTranslations("pages.settings2fa");
  const session = await auth();
  if (!session?.user?.id) redirect("/login");
  const sp = await searchParams;
  const id = Number(session.user.id);

  let user: {
    twoFactorSecret: string | null;
    twoFactorConfirmedAt: Date | null;
    twoFactorRecoveryCodes: string | null;
  } | null = null;
  try {
    user = await prisma.user.findUnique({
      where: { id },
      select: { twoFactorSecret: true, twoFactorConfirmedAt: true, twoFactorRecoveryCodes: true },
    });
  } catch {
    user = null;
  }

  const hasAppKey = Boolean(env.APP_KEY);
  const enabled = Boolean(user?.twoFactorConfirmedAt);
  const pending = Boolean(user?.twoFactorSecret && !user?.twoFactorConfirmedAt);
  const hotelName = (await siteSettings.get("hotel_name", "Atom")) ?? "Atom";

  let secret = "";
  let uri = "";
  let recoveryCodes: string[] = [];
  if (pending && hasAppKey && user?.twoFactorSecret) {
    try {
      secret = new LaravelEncrypter(env.APP_KEY as string).decrypt(user.twoFactorSecret);
      uri = totpKeyUri(secret, session.user.name ?? "user", hotelName);
      if (user.twoFactorRecoveryCodes) {
        recoveryCodes = JSON.parse(user.twoFactorRecoveryCodes) as string[];
      }
    } catch {
      secret = "";
    }
  }

  return (
    <main style={{ display: "grid", gap: "1.5rem", maxWidth: 560, margin: "0 auto" }}>
      <p className="muted" style={{ margin: 0 }}>
        <Link href="/settings">{t("backToSettings")}</Link>
      </p>

      <ContentCard icon="🔒" title={t("title")} subtitle={t("subtitle")}>
        {sp.enabled ? (
          <>
            <p style={{ color: "var(--color-accent)", marginTop: 0 }}>{t("nowEnabled")}</p>
            <div
              style={{
                background: "var(--color-surface)",
                border: "1px solid var(--color-border)",
                borderRadius: 8,
                padding: "1rem",
                marginTop: "0.5rem",
              }}
            >
              <h4 style={{ margin: "0 0 0.5rem" }}>Recovery Codes</h4>
              <p className="muted" style={{ fontSize: "0.85rem", margin: "0 0 0.75rem" }}>
                Store these one-time use codes in a safe place. Each can be used once if you lose access to
                your authenticator app.
              </p>
              <div
                style={{
                  display: "grid",
                  gridTemplateColumns: "1fr 1fr",
                  gap: "0.25rem",
                  fontFamily: "monospace",
                  fontSize: "0.9rem",
                }}
              >
                {recoveryCodes.map((code) => (
                  <code
                    key={code}
                    style={{
                      userSelect: "all",
                      padding: "0.25rem 0.5rem",
                      background: "var(--color-background)",
                      borderRadius: 4,
                    }}
                  >
                    {code}
                  </code>
                ))}
              </div>
            </div>
          </>
        ) : null}
        {sp.disabled ? (
          <p className="muted" style={{ marginTop: 0 }}>
            {t("disabledNotice")}
          </p>
        ) : null}
        {sp.error === "badcode" ? (
          <p style={{ color: "var(--color-danger)", marginTop: 0 }}>{t("badCode")}</p>
        ) : null}
        {sp.error === "ratelimit" ? (
          <p style={{ color: "var(--color-danger)", marginTop: 0 }}>{t("rateLimit")}</p>
        ) : null}

        {!hasAppKey ? (
          <p style={{ margin: 0 }}>
            {t("noAppKeyPrefix")} <code>APP_KEY</code> {t("noAppKeyMiddle")}
            <code> APP_KEY</code> {t("noAppKeySuffix")}
          </p>
        ) : enabled ? (
          <>
            <p style={{ marginTop: 0 }}>
              <strong>{t("isEnabled")}</strong> {t("onYourAccount")}
            </p>
            <form action={disableTwoFactor} style={{ display: "flex", gap: "0.5rem" }}>
              <input name="code" placeholder={t("codePlaceholder")} inputMode="numeric" required />
              <button type="submit" className="btn btn-danger">
                {t("disable")}
              </button>
            </form>
          </>
        ) : pending ? (
          <>
            <h3 style={{ marginTop: 0 }}>{t("scanOrEnter")}</h3>
            <p className="muted" style={{ marginTop: 0 }}>
              {t("scanInstructions")}
            </p>
            <p>
              {t("manualKey")} <code style={{ userSelect: "all" }}>{secret}</code>
            </p>
            <p className="muted" style={{ wordBreak: "break-all", fontSize: "0.8rem" }}>
              {uri}
            </p>
            <form action={confirmTwoFactor} style={{ display: "flex", gap: "0.5rem", marginTop: "0.5rem" }}>
              <input name="code" placeholder={t("codePlaceholder")} inputMode="numeric" required />
              <button type="submit" className="btn btn-primary">
                {t("confirm")}
              </button>
            </form>
          </>
        ) : (
          <>
            <p style={{ marginTop: 0 }}>{t("enableIntro")}</p>
            <form action={beginTwoFactor}>
              <button type="submit" className="btn btn-primary">
                {t("enable")}
              </button>
            </form>
          </>
        )}
      </ContentCard>
    </main>
  );
}