import { unwrap } from '@pipu/core';
import { useQuery } from '@tanstack/react-query';
import { Link, Outlet, useNavigate } from '@tanstack/react-router';
import { useTranslation } from 'react-i18next';

import { useAuthState, useSession, useUser } from '../app/session';
import { useCollectionCounts } from '../entities/collection';
import {
  auditFillIcon,
  auditIcon,
  groupFillIcon,
  groupIcon,
  homeFillIcon,
  homeIcon,
  libraryFillIcon,
  libraryIcon,
  logoutIcon,
  historyFillIcon,
  historyIcon,
  likeFillIcon,
  likeIcon,
  dislikeFillIcon,
  dislikeIcon,
  settingsIcon,
  storageFillIcon,
  storageIcon, inboxFillIcon, inboxIcon, myUploadsFillIcon, myUploadsIcon, uploadFillIcon, uploadIcon, tuneFillIcon, tuneIcon} from '../shared/ui/icons';
import { Avatar, cx, Icon, Logo, Menu } from '../shared/ui/ui';
import { LanguageSwitch } from './LanguageSwitch';
import { PlayerProvider, usePlayerState } from '../player/context';
import { Ambient } from './Ambient';
import { PlayerBar } from './PlayerBar';
import { SearchBox } from './SearchBox';
import s from './AppShell.module.css';

type NavPath =
  | '/'
  | '/admin/users'
  | '/admin/audit'
  | '/admin/sources'
  | '/admin/library'
  | '/admin/uploads'
  | '/uploads/new'
  | '/uploads/mine'
  | '/admin/settings'
  | '/collection/history'
  | '/collection/likes'
  | '/collection/dislikes';

function NavLink({
  to,
  label,
  icon,
  activeIcon,
  count,
  badge,
}: {
  to: NavPath;
  label: string;
  icon: string;
  activeIcon: string;
  count?: number; // счётчик справа (лайки, дизлайки)
  badge?: number; // яркий бейдж (ждут решения)
}) {
  return (
    <Link to={to} className={s.navItem} activeOptions={{ exact: to === '/' }}>
      {({ isActive }) => (
        <>
          <Icon src={isActive ? activeIcon : icon} className={s.navIcon} />
          <span className={s.navLabel}>{label}</span>
          {badge ? <span className={s.navBadge}>{badge > 99 ? '99+' : badge}</span> : null}
          {!badge && count ? <span className={s.navCount}>{count}</span> : null}
        </>
      )}
    </Link>
  );
}

/** Между выходом и редиректом на /login каркас не рисуется: пользователя уже нет. */
export function AppShell() {
  return useAuthState().status === 'signed_in' ? (
    <PlayerProvider>
      <Shell />
    </PlayerProvider>
  ) : null;
}

function Shell() {
  const { t } = useTranslation();
  const user = useUser();
  const session = useSession();
  const navigate = useNavigate();
  const name = user.display_name ?? user.username;
  const staff = user.role !== 'user';
  const island = user.ui_prefs.web_player === 'island';
  const counts = useCollectionCounts();
  const pending = usePendingUploads(user.role === 'admin');

  return (
    <div className={cx(s.shell, island && s.island)}>
      {user.ui_prefs.ambient !== false && <ShellAmbient />}
      <header className={s.top}>
        <Link to="/" className={s.logoLink}>
          <Logo />
        </Link>
        <SearchBox />
        <div className={s.topRight}>
          <Menu
            label={t('profile.menu')}
            triggerClassName={s.profileButton}
            trigger={<Avatar name={name} />}
            header={
              <div className={s.profileHead}>
                <Avatar name={name} size={40} />
                <div>
                  <div className={s.profileName}>{name}</div>
                  <div className={s.profileMeta}>
                    @{user.username} · {t(`roles.${user.role}`)}
                  </div>
                </div>
                <LanguageSwitch />
              </div>
            }
            items={[
              { label: t('profile.settings'), icon: settingsIcon, onSelect: () => void navigate({ to: '/settings' }) },
              { label: t('profile.logout'), icon: logoutIcon, danger: true, onSelect: () => void session.logout() },
            ]}
          />
        </div>
      </header>

      <nav className={s.side} aria-label={t('nav.main')}>
        <NavLink to="/" label={t('nav.home')} icon={homeIcon} activeIcon={homeFillIcon} />
        <div className={s.navSection}>{t('nav.collection')}</div>
        <NavLink to="/collection/history" label={t('nav.history')} icon={historyIcon} activeIcon={historyFillIcon} />
        <NavLink to="/collection/likes" label={t('nav.likes')} icon={likeIcon} activeIcon={likeFillIcon} count={counts.likes} />
        <NavLink
          to="/collection/dislikes"
          label={t('nav.dislikes')}
          icon={dislikeIcon}
          activeIcon={dislikeFillIcon}
          count={counts.dislikes}
        />
        {staff && (
          <>
            <div className={s.navSection}>{t('nav.admin')}</div>
            <NavLink to="/admin/users" label={t('nav.users')} icon={groupIcon} activeIcon={groupFillIcon} />
            {user.role === 'admin' && (
              <NavLink to="/admin/sources" label={t('nav.sources')} icon={storageIcon} activeIcon={storageFillIcon} />
            )}
            <NavLink to="/admin/library" label={t('nav.library')} icon={libraryIcon} activeIcon={libraryFillIcon} />
            <NavLink to="/uploads/new" label={t('nav.suggest')} icon={uploadIcon} activeIcon={uploadFillIcon} />
            <NavLink to="/uploads/mine" label={t('nav.my_uploads')} icon={myUploadsIcon} activeIcon={myUploadsFillIcon} />
            {user.role === 'admin' && (
              <>
                <NavLink
                  to="/admin/uploads"
                  label={t('nav.upload_queue')}
                  icon={inboxIcon}
                  activeIcon={inboxFillIcon}
                  badge={pending}
                />
                <NavLink to="/admin/settings" label={t('nav.admin_settings')} icon={tuneIcon} activeIcon={tuneFillIcon} />
                <NavLink to="/admin/audit" label={t('nav.audit')} icon={auditIcon} activeIcon={auditFillIcon} />
              </>
            )}
          </>
        )}
      </nav>

      <main className={s.content}>
        <Outlet />
      </main>

      <PlayerBar variant={island ? 'island' : 'bar'} />
    </div>
  );
}

/** Третье пятно фона — в цвете обложки текущего трека. */
function ShellAmbient() {
  const track = usePlayerState().track;
  return <Ambient color={track?.album.cover_colors[0] ?? '#35D3FF'} />;
}

/** Файлов на рассмотрении — бейдж «Очереди» у админа (docs/uploads.md#10). */
function usePendingUploads(enabled: boolean) {
  const session = useSession();
  const q = useQuery({
    queryKey: ['admin-uploads-pending'],
    enabled,
    queryFn: async () =>
      unwrap(
        await session.client.GET('/api/v1/admin/uploads', { params: { query: { status: ['pending_review'], limit: 100 } } }),
      ).items.length,
    refetchInterval: 60_000,
  });
  return q.data;
}