import { useDesktopNavPreferences, type NavTab } from '@/hooks/useNavPreferences';
import { useTranslation } from '@/contexts/language';
import { Button } from '@/components/ui/button';
import { cn } from '@/lib/utils';
import { ArrowUp, ArrowDown, Eye, EyeOff, Lock, RotateCcw, Monitor } from 'lucide-react';

/**
 * Desktop top-nav customizer (Settings).
 *
 * A lightweight list: reorder the primary top-nav tabs with up/down controls
 * and toggle items shown/hidden. Map is the fixed first tab (locked). Hidden
 * items still live in the header's "More" dropdown, so nothing is ever lost.
 * Persists via useDesktopNavPreferences (localStorage).
 */
export function DesktopNavManager() {
  const { primaryIds, hiddenIds, setPrimaryIds, reset, catalog, fixedMapTab } =
    useDesktopNavPreferences();
  const { t } = useTranslation();

  const label = (tab: NavTab) => (tab.labelKey ? t(tab.labelKey) : tab.label);
  const byId = (id: string) => catalog.find((c) => c.id === id);

  const move = (id: string, dir: -1 | 1) => {
    const idx = primaryIds.indexOf(id);
    const next = idx + dir;
    if (idx < 0 || next < 0 || next >= primaryIds.length) return;
    const copy = [...primaryIds];
    [copy[idx], copy[next]] = [copy[next], copy[idx]];
    setPrimaryIds(copy);
  };

  const hide = (id: string) => setPrimaryIds(primaryIds.filter((x) => x !== id));
  const show = (id: string) => setPrimaryIds([...primaryIds, id]);

  return (
    <div className="space-y-5">
      <div className="flex items-start gap-3">
        <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-xl bg-red-500/10 text-red-400">
          <Monitor className="h-5 w-5" />
        </div>
        <div className="min-w-0">
          <h3 className="text-base font-bold text-white">{t('desktopNav.title')}</h3>
          <p className="text-sm text-muted-foreground">
            {t('desktopNav.desc')}
          </p>
        </div>
      </div>

      {/* Fixed Map tab */}
      <div className="flex items-center gap-3 rounded-xl border border-red-500/25 bg-red-500/[0.06] p-3">
        <fixedMapTab.icon className="h-4 w-4 text-red-400" />
        <span className="flex-1 text-sm font-bold text-white">{label(fixedMapTab)}</span>
        <span className="flex items-center gap-1 text-[10px] font-bold uppercase tracking-wider text-gray-500">
          <Lock className="h-3 w-3" /> {t('desktopNav.fixed')}
        </span>
      </div>

      {/* Shown (primary) tabs — reorderable */}
      <div className="space-y-1.5">
        <p className="text-[10px] font-bold uppercase tracking-widest text-gray-500">
          {t('desktopNav.shownInTopBar', { count: primaryIds.length })}
        </p>
        {primaryIds.length === 0 && (
          <p className="rounded-lg border border-dashed border-white/10 p-3 text-xs text-gray-500">
            {t('desktopNav.noExtraTabs')}
          </p>
        )}
        {primaryIds.map((id, i) => {
          const tab = byId(id);
          if (!tab) return null;
          return (
            <div
              key={id}
              className="flex items-center gap-3 rounded-xl border border-white/10 bg-white/[0.03] p-2.5"
            >
              <tab.icon className="h-4 w-4 text-red-400" />
              <span className="flex-1 truncate text-sm font-bold text-white">{label(tab)}</span>
              <button
                type="button"
                onClick={() => move(id, -1)}
                disabled={i === 0}
                aria-label={t('desktopNav.moveUp', { name: label(tab) })}
                className="rounded-lg p-1.5 text-gray-400 transition-colors hover:bg-white/5 hover:text-white disabled:opacity-30"
              >
                <ArrowUp className="h-4 w-4" />
              </button>
              <button
                type="button"
                onClick={() => move(id, 1)}
                disabled={i === primaryIds.length - 1}
                aria-label={t('desktopNav.moveDown', { name: label(tab) })}
                className="rounded-lg p-1.5 text-gray-400 transition-colors hover:bg-white/5 hover:text-white disabled:opacity-30"
              >
                <ArrowDown className="h-4 w-4" />
              </button>
              <button
                type="button"
                onClick={() => hide(id)}
                aria-label={t('desktopNav.hide', { name: label(tab) })}
                title={t('desktopNav.moveToMore')}
                className="rounded-lg p-1.5 text-gray-400 transition-colors hover:bg-white/5 hover:text-amber-400"
              >
                <EyeOff className="h-4 w-4" />
              </button>
            </div>
          );
        })}
      </div>

      {/* Hidden tabs — available to add */}
      {hiddenIds.length > 0 && (
        <div className="space-y-1.5">
          <p className="text-[10px] font-bold uppercase tracking-widest text-gray-500">
            {t('desktopNav.inMoreMenu', { count: hiddenIds.length })}
          </p>
          {hiddenIds.map((id) => {
            const tab = byId(id);
            if (!tab) return null;
            return (
              <div
                key={id}
                className={cn(
                  'flex items-center gap-3 rounded-xl border border-white/5 bg-black/30 p-2.5 opacity-70',
                )}
              >
                <tab.icon className="h-4 w-4 text-gray-500" />
                <span className="flex-1 truncate text-sm font-semibold text-gray-400">
                  {label(tab)}
                </span>
                <button
                  type="button"
                  onClick={() => show(id)}
                  aria-label={t('desktopNav.showInTopBar', { name: label(tab) })}
                  title={t('desktopNav.showInTopBarTitle')}
                  className="flex items-center gap-1.5 rounded-lg border border-white/10 px-2.5 py-1 text-xs font-bold text-gray-300 transition-colors hover:border-red-500/40 hover:text-red-400"
                >
                  <Eye className="h-3.5 w-3.5" /> {t('desktopNav.show')}
                </button>
              </div>
            );
          })}
        </div>
      )}

      <div className="pt-1">
        <Button
          variant="outline"
          onClick={reset}
          className="gap-2 border-white/15 text-gray-300 hover:text-white"
        >
          <RotateCcw className="h-4 w-4" /> {t('desktopNav.reset')}
        </Button>
      </div>
    </div>
  );
}