import React from 'react';
import { useTranslation } from 'react-i18next';
import { Download, Loader2, Plus, Printer, RotateCcw, Save, UploadCloud } from 'lucide-react';
import { Rnd } from 'react-rnd';

import { Badge } from '@/components/ui/badge';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
import { Sheet, SheetContent, SheetHeader, SheetTitle, SheetTrigger } from '@/components/ui/sheet';
import { Textarea } from '@/components/ui/textarea';
import { ToggleGroup, ToggleGroupItem } from '@/components/ui/toggle-group';
import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
import { cn } from '@/lib/utils';

import type { EventQrInvite, EventQrInviteLayout } from '../../api';
import { authorizedFetch, isAuthError } from '../../auth/tokens';

export type QrLayoutCustomization = {
  layout_id?: string;
  headline?: string;
  subtitle?: string;
  description?: string;
  badge_label?: string;
  instructions_heading?: string;
  instructions?: string[];
  link_heading?: string;
  link_label?: string;
  cta_label?: string;
  accent_color?: string;
  text_color?: string;
  background_color?: string;
  secondary_color?: string;
  badge_color?: string;
  background_gradient?: { angle?: number; stops?: string[] } | null;
  logo_data_url?: string | null;
  logo_url?: string | null;
  mode?: 'standard' | 'advanced';
  elements?: AdvancedLayoutElementPayload[];
};

type AdvancedLayoutElement = {
  id: string;
  type: 'qr' | 'headline' | 'subtitle' | 'description' | 'link' | 'badge' | 'logo';
  x: number;
  y: number;
  width: number;
  height: number;
  fontSize?: number;
  align?: 'left' | 'center' | 'right';
  content?: string | null;
};

type AdvancedLayoutElementPayload = {
  id: string;
  type: AdvancedLayoutElement['type'];
  x: number;
  y: number;
  width: number;
  height: number;
  font_size?: number;
  align?: 'left' | 'center' | 'right';
  content?: string | null;
};

type AdvancedSerializationContext = {
  form: QrLayoutCustomization;
  eventName: string;
  inviteUrl: string;
  instructions: string[];
  qrSize: number;
  badgeFallback: string;
  logoUrl: string | null;
};

const ADVANCED_CANVAS_WIDTH = 1080;
const ADVANCED_CANVAS_HEIGHT = 1520;
const ADVANCED_MIN_QR = 240;
const ADVANCED_MAX_QR = 720;
const ADVANCED_MIN_TEXT_WIDTH = 160;
const ADVANCED_MIN_TEXT_HEIGHT = 80;

function clamp(value: number, min: number, max: number): number {
  if (Number.isNaN(value)) {
    return min;
  }
  return Math.min(Math.max(value, min), max);
}

function buildDefaultAdvancedElements(
  layout: EventQrInviteLayout | null,
  form: QrLayoutCustomization,
  eventName: string,
  qrSize: number
): AdvancedLayoutElement[] {
  const resolvedQrSize = Math.min(Math.max(qrSize, ADVANCED_MIN_QR), ADVANCED_MAX_QR);
  return [
    {
      id: 'headline',
      type: 'headline',
      x: 80,
      y: 120,
      width: 520,
      height: 160,
      fontSize: 60,
      content: form.headline ?? eventName,
    },
    {
      id: 'description',
      type: 'description',
      x: 80,
      y: 320,
      width: 520,
      height: 240,
      fontSize: 28,
      content: form.description ?? layout?.description ?? '',
    },
    {
      id: 'qr',
      type: 'qr',
      x: 640,
      y: 320,
      width: resolvedQrSize,
      height: resolvedQrSize,
    },
    {
      id: 'link',
      type: 'link',
      x: 640,
      y: 320 + resolvedQrSize + 40,
      width: 360,
      height: 140,
      fontSize: 26,
      content: form.link_label ?? '',
    },
    {
      id: 'badge',
      type: 'badge',
      x: 80,
      y: 60,
      width: 260,
      height: 70,
      fontSize: 28,
      content: form.badge_label ?? 'Digitale Gästebox',
    },
  ];
}

function normalizeAdvancedElements(elements: AdvancedLayoutElement[]): AdvancedLayoutElement[] {
  return (elements ?? []).map((element) => ({
    ...element,
    x: Number(element.x ?? 0),
    y: Number(element.y ?? 0),
    width: Number(element.width ?? 0),
    height: Number(element.height ?? 0),
    fontSize: element.fontSize ? Number(element.fontSize) : undefined,
  }));
}

function convertPayloadToElements(payload: AdvancedLayoutElementPayload[] | undefined | null): AdvancedLayoutElement[] {
  if (!Array.isArray(payload)) {
    return [];
  }

  return payload.map((item) => ({
    id: item.id,
    type: item.type,
    x: Number(item.x ?? 0),
    y: Number(item.y ?? 0),
    width: Number(item.width ?? 0),
    height: Number(item.height ?? 0),
    fontSize: item.font_size ? Number(item.font_size) : undefined,
    align: item.align ?? 'left',
    content: item.content ?? null,
  }));
}

function clampElementToCanvas(element: AdvancedLayoutElement): AdvancedLayoutElement {
  const minWidth = element.type === 'qr' ? ADVANCED_MIN_QR : ADVANCED_MIN_TEXT_WIDTH;
  const minHeight = element.type === 'qr' ? ADVANCED_MIN_QR : ADVANCED_MIN_TEXT_HEIGHT;
  const width = clamp(element.width, minWidth, ADVANCED_CANVAS_WIDTH);
  const height = clamp(element.height, minHeight, ADVANCED_CANVAS_HEIGHT);
  const maxX = Math.max(ADVANCED_CANVAS_WIDTH - width, 0);
  const maxY = Math.max(ADVANCED_CANVAS_HEIGHT - height, 0);

  return {
    ...element,
    width,
    height,
    x: clamp(element.x, 0, maxX),
    y: clamp(element.y, 0, maxY),
  };
}

function serializeAdvancedElements(
  elements: AdvancedLayoutElement[],
  context: AdvancedSerializationContext
): AdvancedLayoutElementPayload[] {
  return normalizeAdvancedElements(elements).map((element) => {
    const base = clampElementToCanvas(element);
    let content: string | null = base.content ?? null;

    switch (base.type) {
      case 'headline':
        content = context.form.headline ?? context.eventName;
        break;
      case 'subtitle':
        content = context.form.subtitle ?? '';
        break;
      case 'description':
        content = context.form.description ?? '';
        break;
      case 'link':
        content = context.form.link_label ?? context.inviteUrl;
        break;
      case 'badge':
        content = context.form.badge_label ?? context.badgeFallback;
        break;
      case 'logo':
        content = context.logoUrl ?? context.form.logo_url ?? null;
        break;
      default:
        break;
    }

    return {
      id: base.id,
      type: base.type,
      x: Math.round(base.x),
      y: Math.round(base.y),
      width: Math.round(base.width),
      height: Math.round(base.height),
      font_size: base.fontSize ? Math.round(base.fontSize) : undefined,
      align: base.align,
      content,
    };
  });
}

type InviteLayoutCustomizerPanelProps = {
  invite: EventQrInvite | null;
  eventName: string;
  saving: boolean;
  resetting: boolean;
  onSave: (customization: QrLayoutCustomization) => Promise<void>;
  onReset: () => Promise<void>;
  initialCustomization: QrLayoutCustomization | null;
  mode: 'standard' | 'advanced';
};

const MAX_INSTRUCTIONS = 5;

export function InviteLayoutCustomizerPanel({
  invite,
  eventName,
  saving,
  resetting,
  onSave,
  onReset,
  initialCustomization,
  mode,
}: InviteLayoutCustomizerPanelProps): React.JSX.Element {
  const { t } = useTranslation('management');

  const inviteUrl = invite?.url ?? '';
  const qrCodeDataUrl = invite?.qr_code_data_url ?? null;
  const defaultInstructions = React.useMemo(() => {
    const value = t('tasks.customizer.defaults.instructions', { returnObjects: true }) as unknown;
    return Array.isArray(value) ? (value as string[]) : ['QR-Code scannen', 'Profil anlegen', 'Fotos teilen'];
  }, [t]);

  const [availableLayouts, setAvailableLayouts] = React.useState<EventQrInviteLayout[]>(invite?.layouts ?? []);
  const [layoutsLoading, setLayoutsLoading] = React.useState(false);
  const [layoutsError, setLayoutsError] = React.useState<string | null>(null);
  const [selectedLayoutId, setSelectedLayoutId] = React.useState<string | undefined>(initialCustomization?.layout_id ?? invite?.layouts?.[0]?.id);
  const [form, setForm] = React.useState<QrLayoutCustomization>({});
  const [instructions, setInstructions] = React.useState<string[]>([]);
  const [error, setError] = React.useState<string | null>(null);
  const formRef = React.useRef<HTMLFormElement | null>(null);
  const [downloadBusy, setDownloadBusy] = React.useState<string | null>(null);
  const [printBusy, setPrintBusy] = React.useState(false);
  const [activeLayoutIndex, setActiveLayoutIndex] = React.useState(() => {
    if (!availableLayouts.length) {
      return 0;
    }
    const initialIndex = availableLayouts.findIndex((layout) => layout.id === selectedLayoutId);
    return initialIndex >= 0 ? initialIndex : 0;
  });
  const isAdvanced = mode === 'advanced';
  const [elements, setElements] = React.useState<AdvancedLayoutElement[]>([]);
  const [activeElementId, setActiveElementId] = React.useState<string | null>(null);
  const [canvasScale, setCanvasScale] = React.useState(0.52);
  const [mobilePreviewOpen, setMobilePreviewOpen] = React.useState(false);
  const [showFloatingActions, setShowFloatingActions] = React.useState(false);
  const actionsSentinelRef = React.useRef<HTMLDivElement | null>(null);

  const activeLayout = React.useMemo(() => {
    if (!availableLayouts.length) {
      return null;
    }

    if (selectedLayoutId) {
      const match = availableLayouts.find((layout) => layout.id === selectedLayoutId);
      if (match) {
        return match;
      }
    }

    return availableLayouts[activeLayoutIndex] ?? availableLayouts[0];
  }, [availableLayouts, selectedLayoutId, activeLayoutIndex]);

  const activeLayoutQrSize = React.useMemo(() => {
    if (initialCustomization?.mode === 'advanced' && Array.isArray(initialCustomization.elements)) {
      const qrElement = initialCustomization.elements.find((element) => element?.type === 'qr');
      if (qrElement && typeof qrElement.width === 'number' && qrElement.width > 0) {
        return qrElement.width;
      }
    }

    return activeLayout?.preview?.qr_size_px ?? 500;
  }, [initialCustomization?.mode, initialCustomization?.elements, activeLayout?.preview?.qr_size_px]);

  const updateElement = React.useCallback(
    (
      id: string,
      updater: Partial<AdvancedLayoutElement> | ((element: AdvancedLayoutElement) => Partial<AdvancedLayoutElement>)
    ) => {
      setElements((current) =>
        current.map((element) => {
          if (element.id !== id) {
            return element;
          }
          const patch = typeof updater === 'function' ? updater(element) : updater;
          return clampElementToCanvas({ ...element, ...patch });
        })
      );
    },
    []
  );

  const handleResetAdvanced = React.useCallback(() => {
    if (!activeLayout) {
      setElements([]);
      return;
    }

    setElements(buildDefaultAdvancedElements(activeLayout, form, eventName, activeLayoutQrSize));
    setActiveElementId(null);
  }, [activeLayout, form, eventName, activeLayoutQrSize]);

  React.useEffect(() => {
    if (!invite) {
      setAvailableLayouts([]);
      setSelectedLayoutId(undefined);
      return;
    }

    const layouts = invite.layouts ?? [];
    setAvailableLayouts(layouts);
    setLayoutsError(null);
    setSelectedLayoutId((current) => {
      if (current && layouts.some((layout) => layout.id === current)) {
        return current;
      }
      if (initialCustomization?.layout_id && layouts.some((layout) => layout.id === initialCustomization.layout_id)) {
        return initialCustomization.layout_id;
      }
      return layouts[0]?.id;
    });
  }, [invite?.id, initialCustomization?.layout_id]);

  React.useEffect(() => {
    let cancelled = false;

    async function loadLayouts(url: string) {
      try {
        setLayoutsLoading(true);
        setLayoutsError(null);
        const target = (() => {
          try {
            if (url.startsWith('http://') || url.startsWith('https://')) {
              const parsed = new URL(url);
              return parsed.pathname + parsed.search;
            }
          } catch (parseError) {
            console.warn('[Invites] Failed to parse layout URL', parseError);
          }
          return url;
        })();
        const response = await authorizedFetch(target, {
          method: 'GET',
          headers: { Accept: 'application/json' },
        });

        if (!response.ok) {
          console.error('[Invites] Layout request failed', response.status, response.statusText);
          throw new Error(`Failed with status ${response.status}`);
        }

        const json = await response.json();
        const items = Array.isArray(json?.data) ? (json.data as EventQrInviteLayout[]) : [];

        if (!cancelled) {
          setAvailableLayouts(items);
          setSelectedLayoutId((current) => {
            if (current && items.some((layout) => layout.id === current)) {
              return current;
            }
            if (initialCustomization?.layout_id && items.some((layout) => layout.id === initialCustomization.layout_id)) {
              return initialCustomization.layout_id;
            }
            return items[0]?.id;
          });
        }
      } catch (err) {
        if (!cancelled) {
          console.error('[Invites] Failed to load layouts', err);
          setLayoutsError(t('invites.customizer.loadingError', 'Layouts konnten nicht geladen werden.'));
        }
      } finally {
        if (!cancelled) {
          setLayoutsLoading(false);
        }
      }
    }

    if (!invite || availableLayouts.length > 0 || !invite.layouts_url) {
      return () => {
        cancelled = true;
      };
    }

    void loadLayouts(invite.layouts_url);

    return () => {
      cancelled = true;
    };
  }, [invite, availableLayouts.length, initialCustomization?.layout_id, t]);

  React.useEffect(() => {
    if (!availableLayouts.length) {
      return;
    }

    setSelectedLayoutId((current) => {
      if (current && availableLayouts.some((layout) => layout.id === current)) {
        return current;
      }
      if (initialCustomization?.layout_id && availableLayouts.some((layout) => layout.id === initialCustomization.layout_id)) {
        return initialCustomization.layout_id;
      }
      return availableLayouts[0].id;
    });
  }, [availableLayouts, initialCustomization?.layout_id]);

  React.useEffect(() => {
    if (!invite || !activeLayout) {
      setForm({});
      setInstructions([]);
      return;
    }

    const baseInstructions = Array.isArray(initialCustomization?.instructions) && initialCustomization.instructions?.length
      ? [...(initialCustomization.instructions as string[])]
      : [...defaultInstructions];

    setInstructions(baseInstructions);

    setForm({
      layout_id: activeLayout.id,
      headline: initialCustomization?.headline ?? eventName,
      subtitle: initialCustomization?.subtitle ?? activeLayout.subtitle ?? '',
      description: initialCustomization?.description ?? activeLayout.description ?? '',
      badge_label: initialCustomization?.badge_label ?? t('tasks.customizer.defaults.badgeLabel'),
      instructions_heading: initialCustomization?.instructions_heading ?? t('tasks.customizer.defaults.instructionsHeading'),
      link_heading: initialCustomization?.link_heading ?? t('tasks.customizer.defaults.linkHeading'),
      link_label: initialCustomization?.link_label ?? inviteUrl,
      cta_label: initialCustomization?.cta_label ?? t('tasks.customizer.defaults.ctaLabel'),
      accent_color: initialCustomization?.accent_color ?? activeLayout.preview?.accent ?? '#6366F1',
      text_color: initialCustomization?.text_color ?? activeLayout.preview?.text ?? '#111827',
      background_color: initialCustomization?.background_color ?? activeLayout.preview?.background ?? '#FFFFFF',
      secondary_color: initialCustomization?.secondary_color ?? 'rgba(15,23,42,0.08)',
      badge_color: initialCustomization?.badge_color ?? activeLayout.preview?.accent ?? '#2563EB',
      background_gradient: initialCustomization?.background_gradient ?? activeLayout.preview?.background_gradient ?? null,
      logo_data_url: initialCustomization?.logo_data_url ?? initialCustomization?.logo_url ?? null,
    });
    setError(null);
  }, [invite?.id, activeLayout?.id, defaultInstructions, initialCustomization, eventName, inviteUrl, t]);

  React.useEffect(() => {
    if (!isAdvanced) {
      setActiveElementId(null);
      return;
    }

    if (!activeLayout) {
      setElements([]);
      return;
    }

    if (initialCustomization?.mode === 'advanced' && Array.isArray(initialCustomization.elements) && initialCustomization.elements.length) {
      setElements(normalizeAdvancedElements(convertPayloadToElements(initialCustomization.elements)));
      return;
    }

    setElements(buildDefaultAdvancedElements(activeLayout, form, eventName, activeLayoutQrSize));
  }, [isAdvanced, activeLayout?.id, invite?.id, activeLayoutQrSize]);

  React.useEffect(() => {
    if (typeof IntersectionObserver === 'undefined') {
      setShowFloatingActions(false);
      return;
    }

    const node = actionsSentinelRef.current;
    if (!node) {
      setShowFloatingActions(false);
      return;
    }

    const observer = new IntersectionObserver(([entry]) => {
      setShowFloatingActions(!entry.isIntersecting);
    });

    observer.observe(node);

    return () => {
      observer.disconnect();
    };
  }, [invite?.id, activeLayout?.id]);

  const effectiveInstructions = instructions.filter((entry) => entry.trim().length > 0);

  const advancedPreview = React.useMemo(() => ({
    headline: form.headline ?? eventName,
    subtitle: form.subtitle ?? '',
    description: form.description ?? activeLayout?.description ?? '',
    link: form.link_label ?? inviteUrl,
    badge: form.badge_label ?? t('tasks.customizer.defaults.badgeLabel'),
    background: form.background_color ?? activeLayout?.preview?.background ?? '#FFFFFF',
    text: form.text_color ?? activeLayout?.preview?.text ?? '#111827',
    accent: form.accent_color ?? activeLayout?.preview?.accent ?? '#6366F1',
    logo: form.logo_data_url ?? form.logo_url ?? null,
    instructions: effectiveInstructions,
  }), [form.headline, form.subtitle, form.description, form.link_label, form.badge_label, form.background_color, form.text_color, form.accent_color, form.logo_data_url, form.logo_url, eventName, activeLayout?.description, activeLayout?.preview?.background, activeLayout?.preview?.text, activeLayout?.preview?.accent, effectiveInstructions, inviteUrl, t]);

  const renderActionButtons = (mode: 'inline' | 'floating') => (
    <>
      <Button
        type="button"
        variant="outline"
        onClick={() => void handleResetClick()}
        disabled={resetting || saving}
        className={cn('w-full sm:w-auto', mode === 'floating' ? 'sm:w-auto' : '')}
      >
        {resetting ? <Loader2 className="mr-2 h-4 w-4 animate-spin" /> : <RotateCcw className="mr-2 h-4 w-4" />}
        {t('invites.customizer.actions.reset', 'Zurücksetzen')}
      </Button>
      <Button
        type="button"
        disabled={saving || resetting}
        onClick={() => {
          if (formRef.current) {
            if (typeof formRef.current.requestSubmit === 'function') {
              formRef.current.requestSubmit();
            } else {
              formRef.current.submit();
            }
          }
        }}
        className={cn('w-full bg-gradient-to-r from-amber-500 via-orange-500 to-rose-500 text-white sm:w-auto', mode === 'floating' ? 'sm:w-auto' : '')}
      >
        {saving ? <Loader2 className="mr-2 h-4 w-4 animate-spin" /> : <Save className="mr-2 h-4 w-4" />}
        {t('invites.customizer.actions.save', 'Layout speichern')}
      </Button>
    </>
  );

  const previewStyles = React.useMemo(() => {
    const gradient = form.background_gradient ?? activeLayout?.preview?.background_gradient ?? null;
    if (gradient?.stops && gradient.stops.length > 0) {
      const angle = gradient.angle ?? 180;
      const stops = gradient.stops.join(', ');
      return { backgroundImage: `linear-gradient(${angle}deg, ${stops})` };
    }
    return { backgroundColor: form.background_color ?? activeLayout?.preview?.background ?? '#F8FAFC' };
  }, [form.background_color, form.background_gradient, activeLayout]);

  const previewStack = (
    <div className="space-y-4">
      <div className="flex items-center justify-between">
        <div>
          <h3 className="text-sm font-semibold uppercase tracking-wide text-muted-foreground">{t('invites.customizer.preview.title', 'Live-Vorschau')}</h3>
          <p className="text-xs text-muted-foreground">{t('invites.customizer.preview.subtitle', 'So sieht dein Layout beim Export aus.')}</p>
        </div>
        <div className="flex gap-2">
          <Button
            type="button"
            variant="outline"
            size="sm"
            onClick={() => void handlePrint(activeLayout?.download_urls?.pdf ?? activeLayout?.download_urls?.a4)}
            disabled={printBusy || Boolean(downloadBusy)}
          >
            {printBusy ? <Loader2 className="mr-1 h-4 w-4 animate-spin" /> : <Printer className="mr-1 h-4 w-4" />}
            {t('invites.customizer.actions.print', 'Drucken')}
          </Button>
          {activeLayout?.formats?.map((format) => {
            const key = String(format ?? '').toLowerCase();
            const url = activeLayout.download_urls?.[key];
            if (!url) return null;
            return (
              <Button
                key={`${activeLayout.id}-${key}`}
                type="button"
                variant="outline"
                size="sm"
                disabled={printBusy || downloadBusy !== null}
                onClick={() => void handleDownload(key, url)}
              >
                {downloadBusy === key ? <Loader2 className="mr-1 h-4 w-4 animate-spin" /> : <Download className="mr-1 h-4 w-4" />}
                {key.toUpperCase()}
              </Button>
            );
          })}
        </div>
      </div>

      <div className="space-y-4 rounded-xl border border-[var(--tenant-border-strong)] bg-[var(--tenant-surface-strong)] p-5 shadow-inner transition-colors">
        <div className="rounded-xl p-5 text-foreground" style={previewStyles}>
          <div className="flex items-start justify-between">
            <span
              className="rounded-full px-3 py-1 text-xs font-semibold uppercase tracking-wide"
              style={{ backgroundColor: form.badge_color ?? form.accent_color ?? '#2563EB', color: '#ffffff' }}
            >
              {form.badge_label || t('tasks.customizer.defaults.badgeLabel')}
            </span>
            <div className="flex h-14 w-14 items-center justify-center rounded-full bg-[var(--tenant-layer)] shadow" style={{ color: form.accent_color ?? '#2563EB' }}>
              <SmileIcon />
            </div>
          </div>
          <div className="mt-6 space-y-2">
            <h4 className="text-lg font-semibold leading-tight" style={{ color: form.text_color ?? '#111827' }}>
              {form.headline || eventName}
            </h4>
            {form.subtitle ? (
              <p className="text-sm" style={{ color: form.text_color ?? '#111827', opacity: 0.75 }}>
                {form.subtitle}
              </p>
            ) : null}
          </div>
          {form.description ? (
            <p className="mt-4 text-sm" style={{ color: form.text_color ?? '#111827' }}>
              {form.description}
            </p>
          ) : null}
          <div className="mt-5 grid gap-3 rounded-xl border border-[var(--tenant-border-strong)] bg-[var(--tenant-layer)] p-4 shadow-sm">
            <div className="text-xs font-semibold uppercase tracking-wide text-[var(--tenant-foreground-soft)]">{form.instructions_heading}</div>
            <ol className="grid gap-2 text-sm text-muted-foreground">
              {effectiveInstructions.slice(0, 4).map((item, index) => (
                <li key={`preview-instruction-${index}`} className="flex gap-2">
                  <span className="font-semibold" style={{ color: form.accent_color ?? '#2563EB' }}>{index + 1}.</span>
                  <span>{item}</span>
                </li>
              ))}
            </ol>
          </div>
          <div className="mt-5 rounded-2xl border border-[var(--tenant-border-strong)] bg-[var(--tenant-layer-strong)] p-5 text-sm text-[var(--tenant-foreground-soft)] shadow-sm">
            <div className="flex items-center justify-between gap-3">
              <span className="text-xs font-semibold uppercase tracking-wide text-[var(--tenant-foreground-soft)]">{form.link_heading}</span>
              <Badge variant="outline" className="rounded-full border border-[var(--tenant-border-strong)] bg-[var(--tenant-layer)] px-2 py-0.5 text-[10px] font-semibold uppercase tracking-wide">
                {t('invites.customizer.preview.readyForGuests', 'Bereit für Gäste')}
              </Badge>
            </div>
            <div className="mt-4 grid gap-4 lg:grid-cols-[auto,minmax(0,1fr)] lg:items-center">
              <div className="flex justify-center">
                {qrCodeDataUrl ? (
                  <img
                    src={qrCodeDataUrl}
                    alt={t('invites.customizer.preview.qrAlt', 'QR-Code der Einladung')}
                    className="h-44 w-44 rounded-3xl border border-[var(--tenant-border-strong)] bg-[var(--tenant-layer)] p-4 shadow-md md:h-64 md:w-64"
                  />
                ) : (
                  <div className="flex h-44 w-44 items-center justify-center rounded-3xl border border-dashed border-[var(--tenant-border-strong)] bg-[var(--tenant-surface-muted)] p-4 text-center text-xs text-muted-foreground md:h-64 md:w-64">
                    {t('invites.customizer.preview.qrPlaceholder', 'QR-Code folgt nach dem Speichern')}
                  </div>
                )}
              </div>
              <div className="flex flex-col gap-3">
                <div className="rounded-xl border border-[var(--tenant-border-strong)] bg-[var(--tenant-layer)] px-3 py-2">
                  <span className="block truncate font-medium" style={{ color: form.accent_color ?? '#2563EB' }}>
                    {form.link_label || inviteUrl}
                  </span>
                </div>
                <p className="text-xs leading-relaxed text-muted-foreground">
                  {t('invites.customizer.preview.instructions', 'Dieser Link führt Gäste direkt zur Galerie und funktioniert zusammen mit dem QR-Code auf dem Ausdruck.')}
                </p>
                <Button size="sm" className="w-full bg-gradient-to-r from-amber-500 via-orange-500 to-rose-500 text-white sm:w-auto">
                  {form.cta_label || t('tasks.customizer.defaults.ctaLabel')}
                </Button>
              </div>
            </div>
          </div>
        </div>
        {form.logo_data_url ? (
          <div className="flex items-center justify-center rounded-lg border border-dashed border-[var(--tenant-border-strong)] bg-[var(--tenant-surface-muted)] py-4">
            <img src={form.logo_data_url} alt="Logo preview" className="max-h-16 object-contain" />
          </div>
        ) : null}
      </div>
    </div>
  );

  function updateForm<T extends keyof QrLayoutCustomization>(key: T, value: QrLayoutCustomization[T]) {
    setForm((prev) => ({ ...prev, [key]: value }));
  }

  function handleLayoutSelect(layout: EventQrInviteLayout) {
    setSelectedLayoutId(layout.id);
    updateForm('layout_id', layout.id);
    setForm((prev) => ({
      ...prev,
      accent_color: prev.accent_color ?? layout.preview?.accent ?? '#6366F1',
      text_color: prev.text_color ?? layout.preview?.text ?? '#111827',
      background_color: prev.background_color ?? layout.preview?.background ?? '#FFFFFF',
      background_gradient: prev.background_gradient ?? layout.preview?.background_gradient ?? null,
    }));
    if (isAdvanced) {
      setElements(buildDefaultAdvancedElements(layout, form, eventName, layout.preview?.qr_size_px ?? activeLayoutQrSize));
      setActiveElementId(null);
    }
  }

  React.useEffect(() => {
    if (!availableLayouts.length) {
      return;
    }
    const index = availableLayouts.findIndex((layout) => layout.id === selectedLayoutId);
    if (index >= 0 && index !== activeLayoutIndex) {
      setActiveLayoutIndex(index);
    }
  }, [availableLayouts, selectedLayoutId, activeLayoutIndex]);

  function rotateLayout(delta: number) {
    if (!availableLayouts.length) {
      return;
    }
    const nextIndex = (activeLayoutIndex + delta + availableLayouts.length) % availableLayouts.length;
    setActiveLayoutIndex(nextIndex);
    handleLayoutSelect(availableLayouts[nextIndex]!);
  }

  function selectLayoutAt(index: number) {
    if (index < 0 || index >= availableLayouts.length) {
      return;
    }
    setActiveLayoutIndex(index);
    handleLayoutSelect(availableLayouts[index]!);
  }

  function handleInstructionChange(index: number, value: string) {
    setInstructions((prev) => {
      const next = [...prev];
      next[index] = value;
      return next;
    });
  }

  function handleAddInstruction() {
    setInstructions((prev) => (prev.length < MAX_INSTRUCTIONS ? [...prev, ''] : prev));
  }

  function handleRemoveInstruction(index: number) {
    setInstructions((prev) => prev.filter((_, idx) => idx !== index));
  }

  function handleLogoUpload(event: React.ChangeEvent<HTMLInputElement>) {
    const file = event.target.files?.[0];
    if (!file) {
      return;
    }

    if (file.size > 1024 * 1024) {
      setError(t('tasks.customizer.errors.logoTooLarge', 'Das Logo darf maximal 1 MB groß sein.'));
      return;
    }

    const reader = new FileReader();
    reader.onload = () => {
      updateForm('logo_data_url', typeof reader.result === 'string' ? reader.result : null);
      setError(null);
    };
    reader.readAsDataURL(file);
  }

  function handleLogoRemove() {
    updateForm('logo_data_url', null);
  }

  async function handleSubmit(event: React.FormEvent<HTMLFormElement>) {
    event.preventDefault();
    if (!invite || !activeLayout) {
      return;
    }

    const payload: QrLayoutCustomization = {
      ...form,
      layout_id: activeLayout.id,
      instructions: effectiveInstructions,
    };

    if (isAdvanced) {
      const serializationContext: AdvancedSerializationContext = {
        form,
        eventName,
        inviteUrl,
        instructions: effectiveInstructions,
        qrSize: activeLayoutQrSize,
        badgeFallback: t('tasks.customizer.defaults.badgeLabel'),
        logoUrl: form.logo_url ?? null,
      };
      payload.mode = 'advanced';
      payload.elements = serializeAdvancedElements(elements.length ? elements : buildDefaultAdvancedElements(activeLayout, form, eventName, activeLayoutQrSize), serializationContext);
    } else {
      payload.mode = 'standard';
      payload.elements = undefined;
    }

    await onSave(payload);
  }

  async function handleResetClick() {
    await onReset();
  }

  function resolveInternalUrl(rawUrl: string): string {
    try {
      const parsed = new URL(rawUrl, window.location.origin);
      if (parsed.origin === window.location.origin) {
        return parsed.pathname + parsed.search;
      }
    } catch (resolveError) {
      console.warn('[Invites] Unable to resolve download url', resolveError);
    }
    return rawUrl;
  }

  async function handleDownload(format: string, rawUrl: string): Promise<void> {
    if (!rawUrl || !invite) {
      return;
    }

    const normalizedFormat = format.toLowerCase();
    const filenameStem = invite.token || 'invite';
    setDownloadBusy(normalizedFormat);
    setError(null);

    try {
      const response = await authorizedFetch(resolveInternalUrl(rawUrl), {
        headers: {
          Accept: normalizedFormat === 'pdf' ? 'application/pdf' : 'image/svg+xml',
        },
      });

      if (!response.ok) {
        throw new Error(`Unexpected status ${response.status}`);
      }

      const blob = await response.blob();
      const objectUrl = URL.createObjectURL(blob);
      const link = document.createElement('a');
      link.href = objectUrl;
      link.download = `${filenameStem}-${normalizedFormat}.${normalizedFormat}`;
      document.body.appendChild(link);
      link.click();
      document.body.removeChild(link);
      setTimeout(() => URL.revokeObjectURL(objectUrl), 1000);
    } catch (downloadError) {
      console.error('[Invites] Download failed', downloadError);
      const message = isAuthError(downloadError)
        ? t('invites.customizer.errors.auth', 'Deine Sitzung ist abgelaufen. Bitte melde dich erneut an.')
        : t('invites.customizer.errors.downloadFailed', 'Download fehlgeschlagen. Bitte versuche es erneut.');
      setError(message);
    } finally {
      setDownloadBusy(null);
    }
  }

  async function handlePrint(preferredUrl?: string | null): Promise<void> {
    const rawUrl = preferredUrl ?? activeLayout?.download_urls?.pdf ?? activeLayout?.download_urls?.a4 ?? null;
    if (!rawUrl) {
      setError(t('invites.labels.noPrintSource', 'Keine druckbare Version verfügbar.'));
      return;
    }

    setPrintBusy(true);
    setError(null);

    try {
      const response = await authorizedFetch(resolveInternalUrl(rawUrl), {
        headers: { Accept: 'application/pdf' },
      });

      if (!response.ok) {
        throw new Error(`Unexpected status ${response.status}`);
      }

      const blob = await response.blob();
      const blobUrl = URL.createObjectURL(blob);
      const printWindow = window.open(blobUrl, '_blank', 'noopener,noreferrer');

      if (!printWindow) {
        throw new Error('window-blocked');
      }

      printWindow.onload = () => {
        try {
          printWindow.focus();
          printWindow.print();
        } catch (printError) {
          console.error('[Invites] Browser print failed', printError);
        }
      };

      setTimeout(() => URL.revokeObjectURL(blobUrl), 60_000);
    } catch (printError) {
      console.error('[Invites] Print failed', printError);
      const message = isAuthError(printError)
        ? t('invites.customizer.errors.auth', 'Deine Sitzung ist abgelaufen. Bitte melde dich erneut an.')
        : t('invites.customizer.errors.printFailed', 'Druck konnte nicht gestartet werden.');
      setError(message);
    } finally {
      setPrintBusy(false);
    }
  }

  if (!invite) {
    return (
      <CardPlaceholder
        title={t('invites.customizer.placeholderTitle', 'Kein Layout verfügbar')}
        description={t('invites.customizer.placeholderCopy', 'Erstelle eine Einladung, damit du Texte, Farben und Drucklayouts bearbeiten kannst.')}
      />
    );
  }

  if (!availableLayouts.length) {
    if (layoutsLoading) {
      return (
        <CardPlaceholder
          title={t('invites.customizer.loadingTitle', 'Layouts werden geladen')}
          description={t('invites.customizer.loadingDescription', 'Bitte warte einen Moment, wir bereiten die Drucklayouts vor.')}
        />
      );
    }

    return (
      <CardPlaceholder
        title={layoutsError ?? t('invites.customizer.placeholderTitle', 'Kein Layout verfügbar')}
        description={layoutsError ?? t('invites.customizer.placeholderCopy', 'Erstelle eine Einladung, damit du Texte, Farben und Drucklayouts bearbeiten kannst.')}
      />
    );
  }

  if (!activeLayout) {
    return (
      <CardPlaceholder
        title={t('invites.customizer.placeholderTitle', 'Kein Layout verfügbar')}
        description={t('invites.customizer.placeholderCopy', 'Erstelle eine Einladung, damit du Texte, Farben und Drucklayouts bearbeiten kannst.')}
      />
    );
  }

  return (
    <div className="space-y-4">
      <div className="flex flex-col gap-4 lg:flex-row lg:items-center lg:justify-between">
        <div>
          <h2 className="text-xl font-semibold text-foreground">{t('invites.customizer.heading', 'Layout anpassen')}</h2>
          <p className="text-sm text-muted-foreground">{t('invites.customizer.copy', 'Verleihe der Einladung euren Ton: Texte, Farben und Logo lassen sich live bearbeiten.')}</p>
        </div>
        <div className="flex flex-wrap gap-2">
          <Button variant="outline" onClick={handleResetClick} disabled={resetting || saving}>
            {resetting ? <Loader2 className="mr-2 h-4 w-4 animate-spin" /> : <RotateCcw className="mr-2 h-4 w-4" />}
            {t('invites.customizer.actions.reset', 'Zurücksetzen')}
          </Button>
          <Button
            type="button"
            onClick={() => {
              if (formRef.current) {
                if (typeof formRef.current.requestSubmit === 'function') {
                  formRef.current.requestSubmit();
                } else {
                  formRef.current.submit();
                }
              }
            }}
            className="bg-gradient-to-r from-amber-500 via-orange-500 to-rose-500 text-white shadow-lg shadow-rose-500/20"
            disabled={saving || resetting}
          >
            {saving ? <Loader2 className="mr-2 h-4 w-4 animate-spin" /> : <Save className="mr-2 h-4 w-4" />}
            {t('invites.customizer.actions.save', 'Layout speichern')}
          </Button>
        </div>
      </div>

      {error ? (
        <div className="rounded-lg border border-rose-200 bg-rose-50 px-4 py-3 text-sm text-rose-700">{error}</div>
      ) : null}

      {invite ? (
        <div className="lg:hidden">
          <Sheet open={mobilePreviewOpen} onOpenChange={setMobilePreviewOpen}>
            <SheetTrigger asChild>
              <Button variant="outline" className="w-full justify-between">
                <span>{t('invites.customizer.preview.mobileOpen', 'Vorschau anzeigen')}</span>
                <span className="text-xs text-muted-foreground">{t('invites.customizer.preview.mobileHint', 'Öffnet eine Vorschau in einem Overlay')}</span>
              </Button>
            </SheetTrigger>
            <SheetContent side="bottom" className="lg:hidden max-h-[85vh] overflow-y-auto border-t bg-[var(--tenant-surface)] p-0">
              <SheetHeader className="px-6 pt-6 pb-2">
                <SheetTitle>{t('invites.customizer.preview.mobileTitle', 'Einladungsvorschau')}</SheetTitle>
              </SheetHeader>
              <div className="space-y-4 overflow-y-auto px-6 pb-8">
                {previewStack}
              </div>
            </SheetContent>
          </Sheet>
        </div>
      ) : null}

      <div className="grid gap-6 lg:grid-cols-[minmax(0,1.05fr)_minmax(0,1fr)]">
        <form ref={formRef} onSubmit={handleSubmit} className="space-y-6">
          <section className="space-y-4 rounded-2xl border border-border bg-[var(--tenant-surface)] p-5 shadow-sm transition-colors">
            <header className="flex flex-col gap-1 sm:flex-row sm:items-center sm:justify-between">
              <div>
                <h3 className="text-sm font-semibold uppercase tracking-wide text-muted-foreground">{t('invites.customizer.sections.layouts', 'Layouts')}</h3>
                <p className="text-xs text-muted-foreground">{t('invites.customizer.sections.layoutsHint', 'Wähle eine Vorlage als Basis aus. Du kannst jederzeit wechseln.')}</p>
              </div>
              <div className="text-xs text-muted-foreground">
                {availableLayouts.length > 1
                  ? t('invites.customizer.carousel.hint', {
                      defaultValue: 'Nutze die Pfeile oder Pfeiltasten, um weitere Layouts zu entdecken.',
                    })
                  : null}
              </div>
            </header>
            
            <div className="space-y-3">
              <Select value={selectedLayoutId} onValueChange={(value) => handleLayoutSelect(availableLayouts.find(l => l.id === value)!)}>
                <SelectTrigger className="w-full">
                  <SelectValue placeholder="Layout auswählen">
                    {activeLayout && (
                      <div className="flex items-center gap-2">
                        <span className="font-medium">{activeLayout.name}</span>
                        {activeLayout.formats?.length ? (
                          <div className="flex gap-1">
                            {activeLayout.formats.slice(0, 2).map((format) => (
                              <span 
                                key={`${activeLayout.id}-${format}`} 
                                className="text-[10px] font-medium uppercase tracking-wide bg-amber-100 text-amber-700 px-1.5 py-0.5 rounded"
                              >
                                {String(format).toUpperCase()}
                              </span>
                            ))}
                          </div>
                        ) : null}
                      </div>
                    )}
                  </SelectValue>
                </SelectTrigger>
                <SelectContent>
                  {availableLayouts.map((layout) => (
                    <SelectItem key={layout.id} value={layout.id}>
                      <div className="flex items-center justify-between w-full">
                        <div className="flex-1">
                          <div className="font-medium">{layout.name}</div>
                          {layout.subtitle && (
                            <div className="text-xs text-muted-foreground">{layout.subtitle}</div>
                          )}
                        </div>
                        {layout.formats?.length ? (
                          <div className="flex gap-1 ml-2">
                            {layout.formats.slice(0, 3).map((format) => (
                              <span 
                                key={`${layout.id}-${format}`} 
                                className="text-[10px] font-medium uppercase tracking-wide bg-amber-100 text-amber-700 px-1.5 py-0.5 rounded"
                              >
                                {String(format).toUpperCase()}
                              </span>
                            ))}
                            {layout.formats.length > 3 && (
                              <span className="text-[10px] text-muted-foreground">+{layout.formats.length - 3}</span>
                            )}
                          </div>
                        ) : null}
                      </div>
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>

            <div className="rounded-xl border border-[var(--tenant-border-strong)] bg-[var(--tenant-surface-muted)] p-4 text-sm text-[var(--tenant-foreground-soft)] transition-colors mt-4">
              <p className="font-medium text-foreground">{activeLayout.name}</p>
              {activeLayout.subtitle ? <p className="mt-1 text-xs text-muted-foreground">{activeLayout.subtitle}</p> : null}
              {activeLayout.description ? <p className="mt-2 leading-relaxed text-muted-foreground">{activeLayout.description}</p> : null}
            </div>
          </section>

          <section className="space-y-4 rounded-2xl border border-border bg-[var(--tenant-surface)] p-5 shadow-sm transition-colors">
            <Tabs defaultValue="text" className="space-y-4">
              <TabsList className="grid w-full grid-cols-3">
                <TabsTrigger value="text">{t('invites.customizer.sections.text', 'Texte')}</TabsTrigger>
                <TabsTrigger value="instructions">{t('invites.customizer.sections.instructions', 'Schritt-für-Schritt')}</TabsTrigger>
                <TabsTrigger value="branding">{t('invites.customizer.sections.branding', 'Farbgebung')}</TabsTrigger>
              </TabsList>
              
              <TabsContent value="text" className="space-y-4">
                <div className="grid gap-4">
                  <div className="space-y-2">
                    <Label htmlFor="invite-headline">{t('invites.customizer.fields.headline', 'Überschrift')}</Label>
                    <Input
                      id="invite-headline"
                      value={form.headline ?? ''}
                      onChange={(event) => updateForm('headline', event.target.value)}
                    />
                  </div>
                  <div className="space-y-2">
                    <Label htmlFor="invite-subtitle">{t('invites.customizer.fields.subtitle', 'Unterzeile')}</Label>
                    <Input
                      id="invite-subtitle"
                      value={form.subtitle ?? ''}
                      onChange={(event) => updateForm('subtitle', event.target.value)}
                    />
                  </div>
                  <div className="space-y-2">
                    <Label htmlFor="invite-description">{t('invites.customizer.fields.description', 'Beschreibung')}</Label>
                    <Textarea
                      id="invite-description"
                      value={form.description ?? ''}
                      onChange={(event) => updateForm('description', event.target.value)}
                      className="min-h-[96px]"
                    />
                  </div>
                  <div className="grid gap-4 sm:grid-cols-2">
                    <div className="space-y-2">
                      <Label htmlFor="invite-badge">{t('invites.customizer.fields.badge', 'Badge-Label')}</Label>
                      <Input
                        id="invite-badge"
                        value={form.badge_label ?? ''}
                        onChange={(event) => updateForm('badge_label', event.target.value)}
                      />
                    </div>
                    <div className="space-y-2">
                      <Label htmlFor="invite-cta">{t('invites.customizer.fields.cta', 'Call-to-Action')}</Label>
                      <Input
                        id="invite-cta"
                        value={form.cta_label ?? ''}
                        onChange={(event) => updateForm('cta_label', event.target.value)}
                      />
                    </div>
                  </div>
                  <div className="grid gap-4 sm:grid-cols-2">
                    <div className="space-y-2">
                      <Label htmlFor="invite-link-heading">{t('invites.customizer.fields.linkHeading', 'Link-Überschrift')}</Label>
                      <Input
                        id="invite-link-heading"
                        value={form.link_heading ?? ''}
                        onChange={(event) => updateForm('link_heading', event.target.value)}
                      />
                    </div>
                    <div className="space-y-2">
                      <Label htmlFor="invite-link-label">{t('invites.customizer.fields.linkLabel', 'Link/Begleittext')}</Label>
                      <Input
                        id="invite-link-label"
                        value={form.link_label ?? ''}
                        onChange={(event) => updateForm('link_label', event.target.value)}
                      />
                    </div>
                  </div>
                </div>
              </TabsContent>

              <TabsContent value="instructions" className="space-y-4">
                <div className="space-y-2">
                  <Label htmlFor="invite-instruction-heading">{t('invites.customizer.fields.instructionsHeading', 'Abschnittsüberschrift')}</Label>
                  <Input
                    id="invite-instruction-heading"
                    value={form.instructions_heading ?? ''}
                    onChange={(event) => updateForm('instructions_heading', event.target.value)}
                  />
                </div>
                <div className="space-y-3">
                  {instructions.map((entry, index) => (
                    <div key={`instruction-${index}`} className="flex gap-2">
                      <Input
                        value={entry}
                        onChange={(event) => handleInstructionChange(index, event.target.value)}
                        placeholder={t('invites.customizer.fields.instructionPlaceholder', 'Beschreibung des Schritts')}
                      />
                      <Button
                        type="button"
                        variant="ghost"
                        className="text-muted-foreground hover:text-destructive"
                        onClick={() => handleRemoveInstruction(index)}
                      >
                        ×
                      </Button>
                    </div>
                  ))}
                </div>
                <Button type="button" variant="outline" size="sm" onClick={handleAddInstruction} disabled={instructions.length >= MAX_INSTRUCTIONS}>
                  <Plus className="mr-1 h-4 w-4" />
                  {t('invites.customizer.actions.addInstruction', 'Punkt hinzufügen')}
                </Button>
              </TabsContent>

              <TabsContent value="branding" className="space-y-4">
                <div className="grid gap-4 sm:grid-cols-2">
                  <div className="space-y-2">
                    <Label htmlFor="invite-accent">{t('invites.customizer.fields.accentColor', 'Akzentfarbe')}</Label>
                    <Input
                      id="invite-accent"
                      type="color"
                      value={form.accent_color ?? '#6366F1'}
                      onChange={(event) => updateForm('accent_color', event.target.value)}
                      className="h-11"
                    />
                  </div>
                  <div className="space-y-2">
                    <Label htmlFor="invite-text-color">{t('invites.customizer.fields.textColor', 'Textfarbe')}</Label>
                    <Input
                      id="invite-text-color"
                      type="color"
                      value={form.text_color ?? '#111827'}
                      onChange={(event) => updateForm('text_color', event.target.value)}
                      className="h-11"
                    />
                  </div>
                  <div className="space-y-2">
                    <Label htmlFor="invite-background-color">{t('invites.customizer.fields.backgroundColor', 'Hintergrund')}</Label>
                    <Input
                      id="invite-background-color"
                      type="color"
                      value={form.background_color ?? '#FFFFFF'}
                      onChange={(event) => updateForm('background_color', event.target.value)}
                      className="h-11"
                    />
                  </div>
                  <div className="space-y-2">
                    <Label htmlFor="invite-badge-color">{t('invites.customizer.fields.badgeColor', 'Badge')}</Label>
                    <Input
                      id="invite-badge-color"
                      type="color"
                      value={form.badge_color ?? '#2563EB'}
                      onChange={(event) => updateForm('badge_color', event.target.value)}
                      className="h-11"
                    />
                  </div>
                </div>

                <div className="space-y-2">
                  <Label>{t('invites.customizer.fields.logo', 'Logo')}</Label>
                  {form.logo_data_url ? (
                    <div className="flex items-center gap-4 rounded-lg border border-[var(--tenant-border-strong)] bg-[var(--tenant-surface-muted)] p-3 text-[var(--tenant-foreground-soft)]">
                      <img src={form.logo_data_url} alt="Logo" className="h-12 w-12 rounded border border-[var(--tenant-border-strong)] object-contain" />
                      <Button type="button" variant="ghost" onClick={handleLogoRemove} className="text-destructive hover:text-destructive/80">
                        {t('invites.customizer.actions.removeLogo', 'Logo entfernen')}
                      </Button>
                    </div>
                  ) : (
                    <label className="flex cursor-pointer items-center gap-3 rounded-lg border border-dashed border-[var(--tenant-border-strong)] bg-[var(--tenant-surface-muted)] px-4 py-3 text-sm text-muted-foreground hover:border-primary">
                      <UploadCloud className="h-4 w-4" />
                      <span>{t('invites.customizer.actions.uploadLogo', 'Logo hochladen (max. 1 MB)')}</span>
                      <input type="file" accept="image/*" className="hidden" onChange={handleLogoUpload} />
                    </label>
                  )}
                </div>
              </TabsContent>
            </Tabs>
          </section>

          <div className={cn('mt-6 flex flex-col gap-2 sm:flex-row sm:justify-end', showFloatingActions ? 'hidden' : 'flex')}>
            {renderActionButtons('inline')}
          </div>
          <div ref={actionsSentinelRef} className="h-1 w-full" />
        </form>
        <div className="hidden lg:block">
          {previewStack}
        </div>
      </div>
      {showFloatingActions ? (
        <div className="pointer-events-auto fixed inset-x-4 bottom-6 z-40 flex flex-col gap-2 rounded-2xl border border-[var(--tenant-border-strong)] bg-[var(--tenant-layer-strong)]/95 p-4 shadow-2xl backdrop-blur-sm sm:inset-x-auto sm:right-6 sm:w-auto sm:flex-row sm:items-center sm:gap-3">
          {renderActionButtons('floating')}
        </div>
      ) : null}
    </div>
  );
}

function CardPlaceholder({ title, description }: { title: string; description: string }) {
  return (
    <div className="rounded-2xl border border-dashed border-[var(--tenant-border-strong)] bg-[var(--tenant-surface-muted)] p-10 text-center text-sm text-[var(--tenant-foreground-soft)] transition-colors">
      <h3 className="text-base font-semibold text-foreground">{title}</h3>
      <p className="mt-2 text-sm text-muted-foreground">{description}</p>
    </div>
  );
}

function SmileIcon(): React.JSX.Element {
  return (
    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" className="h-5 w-5">
      <circle cx="12" cy="12" r="10" opacity="0.4" />
      <path d="M8 14s1.5 2 4 2 4-2 4-2" />
      <path d="M9 9h.01M15 9h.01" strokeLinecap="round" strokeLinejoin="round" />
    </svg>
  );
}