import { useState } from 'react';
import { Link } from 'react-router';
import { Copy, ExternalLink, ImageOff, Link2, MoreVertical, Plus } from 'lucide-react';
import { toast } from 'sonner';
import { Button } from '@/components/ui/button';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import { useClient } from 'hooks/useClient';
import { copyToClipboard } from 'helpers/clipboard';
import type { SharedLink } from './shared';
import { ALBUM_PARAM, formatShortDate, photosSectionPath, shareUrl, thumbUrl } from './shared';
import { ShareLinkDialog, type ShareTarget } from './ShareLinkDialog';
import { useAlbums, useServerConfig, useSharedLinks } from './usePhotosData';
import { useAssetActions } from './useAssetActions';

// Sharing: shared albums, and the links that make them public.
//
// The link column shows a full URL, not a key. The address is Immich's own `externalDomain` read from
// `/server/config` — this plugin still stores no public address of its own, which is what the previous
// version of this file was protecting when it copied a bare key instead. The protection was never the
// point; the missing address was, and Immich already knows it.

export const SharingSection = () => {
  const { token } = useClient();
  const { data: links, isLoading } = useSharedLinks();
  const { data: albums } = useAlbums();
  const { data: config } = useServerConfig();
  const { deleteSharedLink } = useAssetActions();

  const [target, setTarget] = useState<ShareTarget | null>(null);
  const [editing, setEditing] = useState<SharedLink | null>(null);
  const [open, setOpen] = useState(false);

  const sharedAlbums = (albums ?? []).filter((album) => album.shared || album.hasSharedLink);

  const share = (next: ShareTarget) => {
    setEditing(null);
    setTarget(next);
    setOpen(true);
  };

  const edit = (link: SharedLink) => {
    setTarget(null);
    setEditing(link);
    setOpen(true);
  };

  return (
    <div className="flex h-full flex-col">
      <header className="flex items-center gap-2 border-b px-3 py-2">
        <h1 className="text-sm font-semibold">Sharing</h1>
        <div className="flex-1" />
        <DropdownMenu>
          <DropdownMenuTrigger asChild>
            <Button variant="ghost" size="sm" disabled={(albums ?? []).length === 0}>
              <Plus className="mr-1.5 h-4 w-4" />
              Share an album
            </Button>
          </DropdownMenuTrigger>
          <DropdownMenuContent align="end" className="max-h-80 overflow-y-auto">
            {albums?.map((album) => (
              <DropdownMenuItem
                key={album.id}
                onClick={() => share({ kind: 'album', albumId: album.id, albumName: album.albumName })}
              >
                {album.albumName}
              </DropdownMenuItem>
            ))}
          </DropdownMenuContent>
        </DropdownMenu>
      </header>

      <div className="min-h-0 flex-1 space-y-6 overflow-y-auto p-3">
        <section>
          <h2 className="mb-2 text-sm font-semibold">Shared albums</h2>
          {sharedAlbums.length === 0 ? (
            <p className="text-sm text-muted-foreground">No shared albums.</p>
          ) : (
            <div className="grid grid-cols-[repeat(auto-fill,minmax(160px,1fr))] gap-4">
              {sharedAlbums.map((album) => (
                <Link key={album.id} to={`${photosSectionPath('albums')}?${ALBUM_PARAM}=${album.id}`}>
                  <div className="aspect-square overflow-hidden rounded-lg bg-white/5">
                    {album.albumThumbnailAssetId ? (
                      <img
                        src={thumbUrl(album.albumThumbnailAssetId, token)}
                        alt=""
                        loading="lazy"
                        className="h-full w-full object-cover"
                      />
                    ) : (
                      <div className="flex h-full items-center justify-center text-muted-foreground">
                        <ImageOff className="h-8 w-8" />
                      </div>
                    )}
                  </div>
                  <p className="mt-2 truncate text-sm font-medium">{album.albumName}</p>
                  <p className="truncate text-xs text-muted-foreground">
                    {album.assetCount} items · {album.albumUsers.length} people
                  </p>
                </Link>
              ))}
            </div>
          )}
        </section>

        <section>
          <h2 className="mb-2 text-sm font-semibold">Shared links</h2>
          {isLoading && <p className="text-sm text-muted-foreground">Loading…</p>}
          {!isLoading && (links ?? []).length === 0 && (
            <p className="text-sm text-muted-foreground">No shared links.</p>
          )}

          {!isLoading && (links ?? []).length > 0 && !config?.externalDomain && (
            /*
             Worth saying once, at the top, rather than per row: every link here works, and none of them can
             be written as a URL until Immich knows the address it answers on.
            */
            <p className="mb-2 text-xs text-muted-foreground">
              Immich has no <span className="font-medium">External Domain</span> set, so these show as keys
              rather than URLs. Set it in Immich&rsquo;s admin settings.
            </p>
          )}

          {(links ?? []).length > 0 && (
            <ul className="divide-y rounded-lg border">
              {(links ?? []).map((link) => (
                <LinkRow
                  key={link.id}
                  link={link}
                  externalDomain={config?.externalDomain}
                  onEdit={() => edit(link)}
                  onRevoke={() => deleteSharedLink.mutate(link.id)}
                />
              ))}
            </ul>
          )}
        </section>
      </div>

      <ShareLinkDialog open={open} onOpenChange={setOpen} target={target} link={editing} />
    </div>
  );
};

const LinkRow = ({
  link,
  externalDomain,
  onEdit,
  onRevoke,
}: {
  link: SharedLink;
  externalDomain: string | undefined;
  onEdit: () => void;
  onRevoke: () => void;
}) => {
  const url = shareUrl(externalDomain, link);
  const expired = !!link.expiresAt && new Date(link.expiresAt).getTime() < Date.now();

  return (
    <li className="flex items-center gap-3 px-3 py-2">
      <Link2 className={`h-4 w-4 shrink-0 ${expired ? 'text-destructive' : 'text-muted-foreground'}`} />
      <div className="min-w-0 flex-1">
        <p className="truncate text-sm">
          {link.album?.albumName ?? link.description ?? `${link.assets.length} items`}
        </p>
        <p className="truncate text-xs text-muted-foreground">
          {link.expiresAt
            ? `${expired ? 'Expired' : 'Expires'} ${formatShortDate(link.expiresAt)}`
            : 'No expiry'}
          {link.password ? ' · password' : ''}
          {link.allowDownload ? ' · download' : ''}
          {link.allowUpload ? ' · upload' : ''}
          {link.showMetadata ? '' : ' · no metadata'}
        </p>
      </div>

      <Button
        variant="ghost"
        size="icon"
        title={url ? 'Copy link' : 'Copy share key — Immich has no public address set'}
        onClick={() => {
          void copyToClipboard(url ?? link.key);
          toast.success(url ? 'Link copied' : 'Share key copied');
        }}
      >
        <Copy className="h-4 w-4" />
      </Button>

      {url && (
        <Button variant="ghost" size="icon" title="Open" asChild>
          <a href={url} target="_blank" rel="noreferrer">
            <ExternalLink className="h-4 w-4" />
          </a>
        </Button>
      )}

      <DropdownMenu>
        <DropdownMenuTrigger asChild>
          <Button variant="ghost" size="icon" title="More">
            <MoreVertical className="h-4 w-4" />
          </Button>
        </DropdownMenuTrigger>
        <DropdownMenuContent align="end">
          <DropdownMenuItem onClick={onEdit}>Edit</DropdownMenuItem>
          <DropdownMenuItem
            onClick={() => window.confirm('Revoke this link? Anyone holding it loses access.') && onRevoke()}
          >
            Revoke
          </DropdownMenuItem>
        </DropdownMenuContent>
      </DropdownMenu>
    </li>
  );
};