"use client";

import { useActionState, useState } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import type { BackupActionState } from "@/server/actions/backup-admin";

/**
 * Client-Formulare des Betreiber-Portals für Datensicherung/DSGVO. Rendern in
 * den <Modal>-Popups der Mandantenseite (?restore=1 / ?dsgvo=1). Die Server-
 * Actions kommen als (gebundene) Props; die Sicherheitskontrollen (Voll-Admin,
 * MFA-Step-up, getippte Bestätigung) werden serverseitig erzwungen — die UI
 * spiegelt sie nur wider.
 */

type Action = (prev: BackupActionState, formData: FormData) => Promise<BackupActionState>;

export interface SnapshotOption {
  snapshotId: string;
  snapshotAt: string | null;
  totalRows: number | null;
  artifactTenantSlug: string | null;
  tenantMismatch: boolean;
  tables: { model: string; rows: number }[];
}

function Feedback({ state }: { state: BackupActionState }) {
  if (state.status === "error") {
    return <p className="rounded-lg border border-destructive/40 bg-destructive/10 px-3 py-2 text-[12.5px] text-destructive">{state.message}</p>;
  }
  if (state.status === "done") {
    return <p className="rounded-lg border border-emerald-500/40 bg-emerald-500/10 px-3 py-2 text-[12.5px] text-emerald-700 dark:text-emerald-300">{state.message}</p>;
  }
  return null;
}

/** Portal-Restore: Auswahl + Dry-run-Vorschau + TOTP + getippte Bestätigung. */
export function RestoreModalBody({
  tenantId,
  tenantSlug,
  snapshots,
  action,
  mfaEnrolled,
  storeError = false,
}: {
  tenantId: string;
  tenantSlug: string;
  snapshots: SnapshotOption[];
  action: Action;
  mfaEnrolled: boolean;
  /** true = Sicherungsspeicher (S3/MinIO) nicht erreichbar → anderer Hinweis als „keine Sicherung". */
  storeError?: boolean;
}) {
  const [state, formAction, pending] = useActionState<BackupActionState, FormData>(action, { status: "idle" });
  const [selected, setSelected] = useState<string>(snapshots[0]?.snapshotId ?? "");
  const preview = snapshots.find((s) => s.snapshotId === selected) ?? null;
  const expected = `RESTORE ${tenantSlug}`;

  return (
    <form action={formAction} className="space-y-4 p-5">
      <input type="hidden" name="tenantId" value={tenantId} />
      <div className="rounded-lg border border-amber-500/40 bg-amber-500/10 px-3 py-2 text-[12px] text-amber-800 dark:text-amber-200">
        <strong>Destruktiv:</strong> Der Mandant wird gesperrt, sein Datenbestand ersetzt (Wipe + Reinsert).
        Ein Pre-Restore-Sicherheitsschnappschuss wird automatisch erstellt (reversibel). Ausführung im Worker.
      </div>

      {storeError ? (
        <p className="rounded-lg border border-destructive/40 bg-destructive/10 px-3 py-2 text-[12.5px] text-destructive">
          Sicherungsspeicher nicht erreichbar (S3/MinIO nicht konfiguriert oder Bucket fehlt). Bitte die S3_*-Variablen und das Backup-Bucket prüfen.
        </p>
      ) : snapshots.length === 0 ? (
        <p className="text-[12.5px] text-muted-foreground">Kein Sicherungspunkt vorhanden. Zuerst &bdquo;Export jetzt&ldquo; ausf&uuml;hren.</p>
      ) : (
        <>
          <div className="space-y-1.5">
            <Label>Sicherungspunkt</Label>
            <div className="max-h-40 space-y-1 overflow-y-auto rounded-lg border p-1.5">
              {snapshots.map((s) => (
                <label key={s.snapshotId} className="flex cursor-pointer items-center gap-2 rounded-md px-2 py-1.5 text-[12.5px] hover:bg-muted">
                  <input type="radio" name="snapshotId" value={s.snapshotId} checked={selected === s.snapshotId} onChange={() => setSelected(s.snapshotId)} />
                  <span className="font-mono">{s.snapshotId}</span>
                  <span className="text-muted-foreground">{s.snapshotAt ? new Date(s.snapshotAt).toLocaleString() : "—"} · {s.totalRows ?? "?"} Zeilen</span>
                </label>
              ))}
            </div>
          </div>

          {/* Read-only Dry-run/Vorschau VOR der Bestätigung */}
          {preview && (
            <div className="rounded-lg border bg-muted/40 p-3 text-[12px]">
              <p className="mb-1 font-semibold">Vorschau (Dry-run)</p>
              <p className="text-muted-foreground">
                Zielmandant: <span className="font-mono">{tenantSlug}</span> · Artefakt-Mandant: <span className="font-mono">{preview.artifactTenantSlug ?? "?"}</span>
                {preview.tenantMismatch && <span className="ml-1 font-semibold text-destructive">(Mismatch — würde abgewiesen)</span>}
              </p>
              <p className="text-muted-foreground">Snapshot: {preview.snapshotAt ? new Date(preview.snapshotAt).toLocaleString() : "—"} · {preview.totalRows ?? "?"} Zeilen gesamt</p>
              {preview.tables.length > 0 && (
                <p className="mt-1 text-muted-foreground">
                  {preview.tables.slice(0, 8).map((t) => `${t.model}: ${t.rows}`).join(" · ")}
                  {preview.tables.length > 8 ? " …" : ""}
                </p>
              )}
            </div>
          )}

          {mfaEnrolled && (
            <div className="space-y-1.5">
              <Label htmlFor="restore-token">MFA-Code (Step-up)</Label>
              <Input id="restore-token" name="token" inputMode="numeric" autoComplete="one-time-code" placeholder="6-stelliger Code" required />
            </div>
          )}

          <div className="space-y-1.5">
            <Label htmlFor="restore-confirm">Bestätigung — exakt <span className="font-mono">{expected}</span> eingeben</Label>
            <Input id="restore-confirm" name="confirm" placeholder={expected} autoComplete="off" required />
          </div>

          <Feedback state={state} />

          <div className="flex justify-end">
            <Button type="submit" variant="destructive" size="sm" disabled={pending || !selected || (preview?.tenantMismatch ?? false)}>
              {pending ? "Stelle ein…" : "Restore einstellen"}
            </Button>
          </div>
        </>
      )}
    </form>
  );
}

/** „Export jetzt" — On-demand-Sicherung. */
export function ExportModalBody({ tenantId, action, mfaEnrolled }: { tenantId: string; action: Action; mfaEnrolled: boolean }) {
  const [state, formAction, pending] = useActionState<BackupActionState, FormData>(action, { status: "idle" });
  return (
    <div className="space-y-5 p-5">
      <form action={formAction} className="space-y-4">
        <input type="hidden" name="tenantId" value={tenantId} />
        <p className="text-[12.5px] text-muted-foreground">Erstellt einen neuen, verschlüsselten Sicherungspunkt im <strong>Objektspeicher</strong> (Worker) — für Restore und regelmäßige Server-Backups.</p>
        {mfaEnrolled && (
          <div className="space-y-1.5">
            <Label htmlFor="export-token">MFA-Code (Step-up)</Label>
            <Input id="export-token" name="token" inputMode="numeric" autoComplete="one-time-code" placeholder="6-stelliger Code" required />
          </div>
        )}
        <Feedback state={state} />
        <div className="flex justify-end">
          <Button type="submit" size="sm" disabled={pending}>{pending ? "Stelle ein…" : "Export jetzt einstellen"}</Button>
        </div>
      </form>
      <div className="space-y-2 border-t pt-4">
        <p className="text-[12.5px] text-muted-foreground">Oder die Sicherung <strong>direkt auf deinen Rechner</strong> herunterladen — als verschlüsselte <code>.cvb</code>-Datei. Läuft inline (kein Worker/S3 nötig).</p>
        <a href={`/api/platform/backup/download?tenant=${tenantId}`} download className="inline-flex">
          <Button type="button" variant="outline" size="sm">Sicherung herunterladen</Button>
        </a>
      </div>
    </div>
  );
}

export interface SubjectOption { identityId: string; label: string }

/** DSGVO-Zustellung: Per-Mandant oder Per-Person, Ergebnis als signierter Link. */
export function DsgvoModalBody({
  tenantId,
  action,
  subjects,
  mfaEnrolled,
}: {
  tenantId: string;
  action: Action;
  subjects: SubjectOption[];
  mfaEnrolled: boolean;
}) {
  const [state, formAction, pending] = useActionState<BackupActionState, FormData>(action, { status: "idle" });
  const [scope, setScope] = useState<"tenant" | "person">("tenant");
  return (
    <form action={formAction} className="space-y-4 p-5">
      <input type="hidden" name="tenantId" value={tenantId} />
      <div className="space-y-1.5">
        <Label>Umfang</Label>
        <div className="flex gap-4 text-[12.5px]">
          <label className="flex items-center gap-2"><input type="radio" name="scope" value="tenant" checked={scope === "tenant"} onChange={() => setScope("tenant")} /> Gesamter Mandant (Art. 20)</label>
          <label className="flex items-center gap-2"><input type="radio" name="scope" value="person" checked={scope === "person"} onChange={() => setScope("person")} /> Einzelperson (Art. 15/20)</label>
        </div>
      </div>

      {scope === "person" && (
        <div className="space-y-1.5">
          <Label htmlFor="dsgvo-subject">Betroffene Person</Label>
          <select id="dsgvo-subject" name="subjectIdentityId" className="h-8 w-full rounded-lg border border-input bg-transparent px-2.5 text-[12.5px]" required={scope === "person"}>
            <option value="">— auswählen —</option>
            {subjects.map((s) => (
              <option key={s.identityId} value={s.identityId}>{s.label}</option>
            ))}
          </select>
        </div>
      )}

      {mfaEnrolled && (
        <div className="space-y-1.5">
          <Label htmlFor="dsgvo-token">MFA-Code (Step-up)</Label>
          <Input id="dsgvo-token" name="token" inputMode="numeric" autoComplete="one-time-code" placeholder="6-stelliger Code" required />
        </div>
      )}

      <p className="text-[11px] text-muted-foreground">Der Download-Link ist zeitlich begrenzt und nur im Betreiber-Portal (angemeldet) abrufbar.</p>
      <Feedback state={state} />
      <div className="flex justify-end">
        <Button type="submit" size="sm" disabled={pending}>{pending ? "Stelle ein…" : "DSGVO-Export einstellen"}</Button>
      </div>
    </form>
  );
}