fofos-admin/web/CarouselPicker.tsx

import { useEffect, useRef, useState } from 'react';
import { Images, Loader2 } from 'lucide-react';
import { useClient } from 'hooks/useClient';
import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog';
import { readableError } from './errors';

/**
 * Choose WHICH carousel a block shows.
 *
 * ── A reference, not a copy ──
 *
 * `carousels` is a named, ordered set built to be shown in more than one place — the old home carousel
 * already read one by id. So a carousel block stores that id and owns nothing else: reordering the set
 * reorders every block pointing at it, and a photograph swapped there is swapped everywhere. That is
 * the whole reason the set has a name instead of being a list of files on a page.
 *
 * It follows that this picker chooses a SET, and editing what is IN the set happens where the set
 * lives — under Carousels. A block that could also rearrange its own pictures would be a second place
 * to do the same job, and the two would disagree.
 *
 * ── No thumbnails, deliberately ──
 *
 * The plugin has no way to address a rendition: `MediaPicker` hands that job to the platform's file
 * browser, and every path stored here names an ORIGINAL that a browser cannot display. Rather than
 * build a second, worse image pipeline for a dialog, this shows the name and the count — which is what
 * tells two carousels apart, since the name is the thing somebody chose.
 */

export type CarouselSummary = {
  id: number;
  name: string;
  slug: string;
  items: unknown[];
};

export const CarouselPicker = ({
  open,
  onClose,
  onPick,
  selected,
}: {
  open: boolean;
  onClose: () => void;
  onPick: (carouselId: number) => void;
  /** The one this block already shows, so reopening the picker says where it stands. */
  selected?: number | null;
}) => {
  const client = useClient();
  const clientRef = useRef(client);
  clientRef.current = client;

  const [carousels, setCarousels] = useState<CarouselSummary[] | null>(null);
  const [error, setError] = useState<string | null>(null);

  // Re-read on every open rather than once. A carousel created in the other panel while this session
  // has been running would otherwise be missing from a list that looks complete.
  useEffect(() => {
    if (!open) return;
    setCarousels(null);
    setError(null);
    void (async () => {
      try {
        const response = await clientRef.current.get<{ data: CarouselSummary[] }>('/fofos-admin/carousels');
        setCarousels(response.data);
      } catch (failure) {
        setError(readableError(failure));
      }
    })();
  }, [open]);

  return (
    <Dialog open={open} onOpenChange={(next) => !next && onClose()}>
      <DialogContent className="sm:max-w-lg">
        <DialogHeader>
          <DialogTitle>Choose a carousel</DialogTitle>
        </DialogHeader>

        {error && <p className="text-xs text-destructive">{error}</p>}

        {!carousels && !error && (
          <p className="flex items-center gap-2 p-4 text-xs text-muted-foreground">
            <Loader2 className="size-3.5 animate-spin" />
            Loading…
          </p>
        )}

        {/* Nothing to choose is a real state and says what to do about it, rather than an empty box.
            Creating one belongs under Carousels — see the note above about one place per job. */}
        {carousels?.length === 0 && (
          <p className="p-4 text-xs text-muted-foreground">
            No carousels yet. Make one under Carousels, then come back.
          </p>
        )}

        <div className="flex flex-col gap-1.5">
          {carousels?.map((carousel) => {
            const count = Array.isArray(carousel.items) ? carousel.items.length : 0;
            const current = carousel.id === selected;
            return (
              <button
                key={carousel.id}
                type="button"
                onClick={() => onPick(carousel.id)}
                className={`flex items-center gap-3 rounded-lg border p-3 text-left transition-colors ${
                  current ? 'border-primary bg-primary/10' : 'border-border hover:border-primary hover:bg-muted/50'
                }`}
              >
                <Images className="size-4 shrink-0 text-muted-foreground" />
                <span className="min-w-0 flex-1">
                  <span className="block truncate text-sm">{carousel.name}</span>
                  <span className="text-[11px] text-muted-foreground">
                    {count === 1 ? '1 item' : `${count} items`}
                  </span>
                </span>
                {current && <span className="text-[10px] tracking-wide text-primary uppercase">showing</span>}
              </button>
            );
          })}
        </div>
      </DialogContent>
    </Dialog>
  );
};