import { useEffect, useMemo } from 'react';
import {
  ArrowUpRight,
  Clapperboard,
  LayoutGrid,
  ShoppingBag,
} from 'lucide-react';
import { useTranslation } from 'react-i18next';
import { useNavigate } from 'react-router-dom';
import {
  YinianPageHeader,
  YinianPageShell,
  YinianPanel,
} from '@/components/yinian/ui';
import { cn } from '@/lib/utils';
import { useAppCenterStore } from '@/stores/app-center';
import type { AppCenterItem } from '@/types/app-center';

const APP_ICONS = {
  Clapperboard,
  LayoutGrid,
  ShoppingBag,
};

function getAppIcon(icon: string) {
  return APP_ICONS[icon as keyof typeof APP_ICONS] ?? LayoutGrid;
}

export function AppCenter() {
  const { t } = useTranslation('appCenter');
  const navigate = useNavigate();
  const init = useAppCenterStore((state) => state.init);
  const items = useAppCenterStore((state) => state.items);
  const selectedTagKey = useAppCenterStore((state) => state.selectedTagKey);
  const selectTag = useAppCenterStore((state) => state.selectTag);

  useEffect(() => {
    init();
  }, [init]);

  const categoryCounts = useMemo(() => {
    const counts = new Map<string, number>();
    for (const item of items) {
      counts.set(item.categoryKey, (counts.get(item.categoryKey) ?? 0) + 1);
    }
    return [...counts.entries()];
  }, [items]);
  const filteredItems = useMemo(() => (
    selectedTagKey === 'all'
      ? items
      : items.filter((item) => item.tagKeys.includes(selectedTagKey))
  ), [items, selectedTagKey]);

  const openItem = (item: AppCenterItem) => {
    if (item.type === 'external' && item.url) {
      void window.electron.openExternal(item.url);
      return;
    }
    if ((item.type === 'native' || item.type === 'webview') && item.route) {
      navigate(item.route);
      return;
    }
    if (item.type === 'webview' && item.url) {
      void window.electron.openExternal(item.url);
    }
  };

  return (
    <YinianPageShell data-testid="app-center-page" className="h-full max-w-none overflow-hidden">
      <YinianPageHeader className="shrink-0 border-b-0 pb-0">
        <div>
          <h1 className="text-2xl font-semibold tracking-normal text-slate-950 dark:text-slate-50 md:text-3xl">
            {t('title')}
          </h1>
          <p className="mt-2 max-w-xl text-sm leading-6 text-muted-foreground">
            {t('subtitle')}
          </p>
        </div>
      </YinianPageHeader>

      <section className="min-h-0 flex-1 overflow-hidden">
        <YinianPanel className="min-h-0 overflow-hidden p-4">
          <div className="flex h-full min-h-0 flex-col gap-4">
            <div className="flex shrink-0 flex-col items-start gap-3">
              <div className="flex max-w-[720px] flex-wrap justify-start gap-2">
                <button
                  type="button"
                  onClick={() => selectTag('all')}
                  className={cn(
                    'rounded-lg border px-2.5 py-1 text-xs font-medium transition-colors',
                    selectedTagKey === 'all'
                      ? 'border-[#7DBADB] bg-white text-[#075985] shadow-sm'
                      : 'border-slate-200/80 bg-white/60 text-slate-600 hover:bg-white dark:border-white/10 dark:bg-white/5 dark:text-slate-300 dark:hover:bg-white/20',
                  )}
                >
                  {t('tags.all')} · {items.length}
                </button>
                {categoryCounts.map(([categoryKey, count]) => {
                  const tagKey = categoryKey.replace('categories.', 'tags.');
                  return (
                    <button
                      key={categoryKey}
                      type="button"
                      onClick={() => selectTag(tagKey)}
                      className={cn(
                        'rounded-lg border px-2.5 py-1 text-xs font-medium transition-colors',
                        selectedTagKey === tagKey
                          ? 'border-[#7DBADB] bg-white text-[#075985] shadow-sm'
                          : 'border-slate-200/80 bg-white/60 text-slate-600 hover:bg-white dark:border-white/10 dark:bg-white/5 dark:text-slate-300 dark:hover:bg-white/20',
                      )}
                    >
                      {t(categoryKey)} · {count}
                    </button>
                  );
                })}
              </div>
            </div>

            <div className="min-h-0 overflow-y-auto px-2 py-2">
              {filteredItems.length === 0 ? (
                <div className="flex min-h-[320px] items-center justify-center rounded-lg border border-dashed border-slate-200 bg-white/60 text-sm text-muted-foreground dark:border-white/10 dark:bg-white/5">
                  {t('empty')}
                </div>
              ) : (
                <div className="grid grid-cols-[repeat(auto-fill,minmax(220px,260px))] justify-center gap-4 pb-2 sm:justify-start">
                  {filteredItems.map((item) => {
                    const Icon = getAppIcon(item.icon);
                    return (
                      <button
                        key={item.id}
                        type="button"
                        onClick={(event) => {
                          event.currentTarget.blur();
                          openItem(item);
                        }}
                        data-testid={`app-center-item-${item.id}`}
                        className={cn(
                          'group relative flex min-h-[216px] w-full flex-col items-center overflow-hidden rounded-lg border bg-white px-4 pb-4 pt-5 text-center shadow-none transition-all duration-200',
                          'hover:border-[#7DBADB] hover:bg-white hover:shadow-[0_18px_42px_rgba(15,23,42,0.09)]',
                          'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#1E3A8A]/30',
                          'dark:border-white/10 dark:bg-slate-950/75 dark:hover:shadow-[0_10px_24px_rgba(0,0,0,0.24)]',
                          'border-slate-200/80',
                        )}
                      >
                        <div className="pointer-events-none absolute inset-x-0 top-0 h-20 bg-[linear-gradient(180deg,rgba(229,244,250,0.85),rgba(255,255,255,0))] dark:bg-[linear-gradient(180deg,rgba(30,58,138,0.18),rgba(15,23,42,0))]" />
                        <div className="relative flex h-16 w-16 shrink-0 items-center justify-center rounded-lg bg-[#0369A1] text-white shadow-[0_12px_24px_rgba(3,105,161,0.18)]">
                          <Icon className="h-7 w-7" />
                        </div>
                        <div className="relative mt-4 min-w-0">
                          <div className="truncate text-base font-semibold tracking-normal text-slate-950 dark:text-slate-50">
                            {t(item.nameKey)}
                          </div>
                          <p className="mx-auto mt-2 line-clamp-3 max-w-[13rem] text-xs leading-5 text-muted-foreground">
                            {t(item.descriptionKey)}
                          </p>
                        </div>
                        <span className="relative mt-auto inline-flex h-8 items-center gap-1.5 rounded-lg border border-[#D5E8F3] bg-[#F4FAFD] px-3 text-xs font-medium text-[#075985] opacity-0 transition-all duration-200 group-hover:opacity-100 group-focus-visible:opacity-100 dark:border-white/10 dark:bg-white/5 dark:text-blue-200">
                          {t('actions.open')}
                          <ArrowUpRight className="h-3.5 w-3.5" />
                        </span>
                      </button>
                    );
                  })}
                </div>
              )}
            </div>
          </div>
        </YinianPanel>
      </section>
    </YinianPageShell>
  );
}

export default AppCenter;