"use client";

import { useActionState } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  changePasswordSelf,
  redeemInvitation,
  redeemPasswordReset,
  requestEmailChange,
  requestPasswordReset,
  type EmailChangeState,
  type RedeemResetState,
  type RequestResetState,
  type SelfChangeState,
} from "@/server/actions/auth-recovery";

/**
 * SEC2 — Formulare des Passwort-Self-Service.
 *
 * Alle Rückmeldungen sind bewusst generisch gehalten (Enumeration-Schutz): das
 * Formular zeigt genau den Text, den die Server-Action liefert, und ergänzt ihn
 * nicht um Hinweise auf die Existenz eines Kontos.
 */

const OK = "mt-4 rounded-lg bg-[rgba(57,192,127,0.14)] px-3 py-2 text-sm text-[var(--ok)]";
const ERR = "mt-4 rounded-lg bg-[rgba(255,107,107,0.16)] px-3 py-2 text-sm text-[var(--risk)]";

export function ForgotPasswordForm({ domain }: { domain: "tenant" | "platform" }) {
  const [state, action, pending] = useActionState<RequestResetState, FormData>(
    requestPasswordReset,
    { status: "idle" },
  );

  if (state.status === "done") {
    return (
      <p role="status" className={OK}>
        {state.message}
      </p>
    );
  }

  return (
    <form action={action} className="mt-6 space-y-4">
      <input type="hidden" name="domain" value={domain} />
      <div>
        <Label htmlFor="email">E-Mail-Adresse</Label>
        <Input id="email" name="email" type="email" required autoComplete="email" className="mt-1" />
      </div>
      {state.status === "error" && (
        <p role="alert" className={ERR}>
          {state.message}
        </p>
      )}
      <Button type="submit" className="w-full" disabled={pending}>
        {pending ? "Sende…" : "Link anfordern"}
      </Button>
    </form>
  );
}

export function ResetPasswordForm({
  token,
  domain,
  policyHint,
  loginPath,
  variant = "reset",
}: {
  token: string;
  domain: "tenant" | "platform";
  policyHint: string;
  loginPath: string;
  /** "invite" nutzt den Einladungs-Flow (Option C, WS3) statt des Reset-Flows. */
  variant?: "reset" | "invite";
}) {
  const [state, action, pending] = useActionState<RedeemResetState, FormData>(
    variant === "invite" ? redeemInvitation : redeemPasswordReset,
    { status: "idle" },
  );

  if (state.status === "done") {
    return (
      <div className="mt-4">
        <p role="status" className={OK}>
          {variant === "invite"
            ? "Ihr Konto ist eingerichtet. Sie können sich jetzt anmelden."
            : "Ihr Passwort wurde gesetzt. Alle bisherigen Sitzungen sind abgemeldet."}
        </p>
        {/* Bewusst kein Auto-Login: der Nutzer meldet sich neu an (SEC2 §6). */}
        <Button nativeButton={false} render={<a href={loginPath} />} className="mt-4 w-full justify-center">
          Zur Anmeldung
        </Button>
      </div>
    );
  }

  return (
    <form action={action} className="mt-6 space-y-4">
      <input type="hidden" name="token" value={token} />
      <input type="hidden" name="domain" value={domain} />
      <div>
        <Label htmlFor="password">Neues Passwort</Label>
        <Input id="password" name="password" type="password" required autoComplete="new-password" className="mt-1" />
        <p className="mt-1 text-xs text-muted-foreground">{policyHint}</p>
      </div>
      <div>
        <Label htmlFor="confirm">Wiederholen</Label>
        <Input id="confirm" name="confirm" type="password" required autoComplete="new-password" className="mt-1" />
      </div>
      {state.status === "error" && (
        <p role="alert" className={ERR}>
          {state.message}
        </p>
      )}
      <Button type="submit" className="w-full" disabled={pending}>
        {pending ? "Speichere…" : variant === "invite" ? "Konto einrichten" : "Passwort setzen"}
      </Button>
    </form>
  );
}

export function ChangePasswordSelfForm({
  domain,
  policyHint,
}: {
  domain: "tenant" | "platform";
  policyHint: string;
}) {
  const [state, action, pending] = useActionState<SelfChangeState, FormData>(changePasswordSelf, {
    status: "idle",
  });

  return (
    <form action={action} className="space-y-3">
      <input type="hidden" name="domain" value={domain} />
      <div>
        <Label htmlFor="current">Aktuelles Passwort</Label>
        <Input id="current" name="current" type="password" required autoComplete="current-password" className="mt-1" />
      </div>
      <div>
        <Label htmlFor="new-password">Neues Passwort</Label>
        <Input id="new-password" name="password" type="password" required autoComplete="new-password" className="mt-1" />
        <p className="mt-1 text-xs text-muted-foreground">{policyHint}</p>
      </div>
      <div>
        <Label htmlFor="new-confirm">Wiederholen</Label>
        <Input id="new-confirm" name="confirm" type="password" required autoComplete="new-password" className="mt-1" />
      </div>
      {state.status !== "idle" && (
        <p role="status" className={state.status === "ok" ? OK : ERR}>
          {state.message}
        </p>
      )}
      <Button type="submit" disabled={pending}>
        {pending ? "Speichere…" : "Passwort ändern"}
      </Button>
    </form>
  );
}

export function ChangeEmailForm({
  domain,
  currentEmail,
}: {
  domain: "tenant" | "platform";
  currentEmail: string;
}) {
  const [state, action, pending] = useActionState<EmailChangeState, FormData>(requestEmailChange, {
    status: "idle",
  });

  return (
    <form action={action} className="space-y-3">
      <input type="hidden" name="domain" value={domain} />
      <div>
        <Label htmlFor="newEmail">Neue E-Mail-Adresse</Label>
        <Input id="newEmail" name="newEmail" type="email" required className="mt-1" placeholder={currentEmail} />
        <p className="mt-1 text-xs text-muted-foreground">
          Die Änderung wird erst wirksam, wenn Sie den Link in der neuen Adresse bestätigen.
        </p>
      </div>
      <div>
        <Label htmlFor="email-current">Aktuelles Passwort zur Bestätigung</Label>
        <Input id="email-current" name="current" type="password" required autoComplete="current-password" className="mt-1" />
      </div>
      {state.status !== "idle" && (
        <p role="status" className={state.status === "ok" ? OK : ERR}>
          {state.message}
        </p>
      )}
      <Button type="submit" variant="outline" disabled={pending}>
        {pending ? "Sende…" : "Bestätigungslink senden"}
      </Button>
    </form>
  );
}