import 'package:flutter/material.dart';
import 'package:url_launcher/url_launcher.dart';

import '../data/home_banners.dart';
import '../state/app_state.dart';
import 'common.dart';

/// Independent of home metadata loading/error UI so the official channel stays
/// visible and usable even before configuration has arrived.
class HomeBanners extends StatelessWidget {
  const HomeBanners({super.key, required this.future});
  final Future<List<HomeBanner>> future;

  Future<void> _open(BuildContext context, Uri target) async {
    try {
      if (await launchUrl(target, mode: LaunchMode.externalApplication)) return;
    } catch (_) {
      // Do not expose platform exceptions, configuration values or URLs.
    }
    if (context.mounted) {
      toast(
        context,
        tr(context, 'Could not open this link', 'باز کردن پیوند ممکن نشد'),
        kind: ToastKind.error,
      );
    }
  }

  @override
  Widget build(BuildContext context) => FutureBuilder<List<HomeBanner>>(
    future: future,
    builder: (context, snapshot) {
      final banners = [
        HomeBanner.telegram,
        if (!snapshot.hasError)
          ...?snapshot.data?.where((item) => item.isAdvertisement).take(5),
      ];
      return Padding(
        padding: const EdgeInsets.fromLTRB(20, 12, 20, 0),
        child: Column(
          children: [
            for (var i = 0; i < banners.length; i++)
              Padding(
                padding: EdgeInsets.only(
                  bottom: i == banners.length - 1 ? 0 : 12,
                ),
                child: _BannerCard(
                  banner: banners[i],
                  tapKey: Key(
                    banners[i].isAdvertisement
                        ? 'home-banner-ad-$i'
                        : 'home-banner-telegram',
                  ),
                  onTap: () => _open(context, banners[i].target),
                ),
              ),
          ],
        ),
      );
    },
  );
}

class _BannerCard extends StatelessWidget {
  const _BannerCard({
    required this.banner,
    required this.tapKey,
    required this.onTap,
  });
  final HomeBanner banner;
  final Key tapKey;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    final state = AppScope.of(context);
    final persian = state.locale == 'fa';
    final colors = Theme.of(context).colorScheme;
    final subtitle = banner.subtitle(persian);
    return Material(
      color: colors.primary.withValues(alpha: .08),
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(16),
        side: BorderSide(color: colors.primary.withValues(alpha: .22)),
      ),
      clipBehavior: Clip.antiAlias,
      child: InkWell(
        key: tapKey,
        onTap: onTap,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            if (banner.image != null && !state.prefs.dataSaver)
              Image.network(
                banner.image.toString(),
                height: 112,
                fit: BoxFit.cover,
                cacheWidth: 700,
                excludeFromSemantics: true,
                errorBuilder: (_, _, _) => const SizedBox.shrink(),
              ),
            Padding(
              padding: const EdgeInsets.all(16),
              child: Row(
                children: [
                  Icon(
                    banner.isAdvertisement
                        ? Icons.ad_units_outlined
                        : Icons.campaign_outlined,
                    color: colors.primary,
                    size: 18,
                  ),
                  const SizedBox(width: 12),
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        if (banner.isAdvertisement) ...[
                          Text(
                            tr(context, 'Advertisement', 'تبلیغات'),
                            style: Theme.of(context).textTheme.labelSmall
                                ?.copyWith(
                                  color: colors.primary,
                                  fontWeight: FontWeight.w500,
                                ),
                          ),
                          const SizedBox(height: 4),
                        ],
                        Text(
                          banner.title(persian),
                          style: Theme.of(context).textTheme.titleSmall
                              ?.copyWith(fontWeight: FontWeight.w600),
                        ),
                        if (subtitle.isNotEmpty) ...[
                          const SizedBox(height: 4),
                          Text(
                            subtitle,
                            style: Theme.of(context).textTheme.bodySmall
                                ?.copyWith(color: colors.onSurfaceVariant),
                          ),
                        ],
                      ],
                    ),
                  ),
                  const SizedBox(width: 8),
                  Icon(
                    Icons.open_in_new_rounded,
                    color: colors.primary,
                    size: 18,
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}