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

import '../../../common/theme/theme.dart';
import '../../../domain/wallet/wallet.dart';
import '../../../sample/promo_sample_data.dart';
import '../../components/assets/assets.gen.dart';
import '../wallet/wallet_ui.dart';

/// Promo aktif dengan sisa hari segini dianggap segera berakhir.
const int promoEndingSoonDays = 3;

extension PromoTypeUi on PromoType {
  String get label => switch (this) {
    PromoType.point => 'EnakPoint',
    PromoType.coin => 'EnakCoin',
    PromoType.reward => 'Hadiah',
  };

  /// Warna aksen untuk teks dan latar tipis; cukup gelap di atas putih.
  Color get color => switch (this) {
    PromoType.point => AppColor.primary,
    PromoType.coin => const Color(0xFFC26A00),
    PromoType.reward => AppColor.secondaryDark,
  };

  /// Latar banner; teks putih di atasnya.
  List<Color> get gradient => switch (this) {
    PromoType.point => AppColor.primaryGradient,
    PromoType.coin => const [Color(0xFFF59E0B), Color(0xFFC2410C)],
    PromoType.reward => const [Color(0xFF43A047), Color(0xFF1B5E20)],
  };
}

bool isPromoUpcoming(Promo promo) => promo.startDate.isAfter(DateTime.now());

/// Sisa hari kalender sampai [Promo.endDate]; 0 berarti berakhir hari ini.
int promoDaysLeft(Promo promo) {
  final now = DateTime.now();
  final today = DateTime(now.year, now.month, now.day);
  final end = DateTime(
    promo.endDate.year,
    promo.endDate.month,
    promo.endDate.day,
  );
  return end.difference(today).inDays;
}

bool isPromoEndingSoon(Promo promo) =>
    !isPromoUpcoming(promo) && promoDaysLeft(promo) <= promoEndingSoonDays;

/// "12 Okt".
String formatPromoDate(DateTime date) =>
    DateFormat('d MMM', 'id_ID').format(date);

/// "1 Okt – 25 Okt 2026".
String promoPeriodLabel(Promo promo) =>
    '${formatPromoDate(promo.startDate)} – '
    '${DateFormat('d MMM yyyy', 'id_ID').format(promo.endDate)}';

String promoOutletLabel(Promo promo) =>
    promo.outlets.isEmpty ? 'Semua outlet' : promo.outlets.join(', ');

/// "Mulai 4 Okt" / "Berakhir 2 hari lagi" / "s/d 25 Okt".
String promoTimeLabel(Promo promo) {
  if (isPromoUpcoming(promo)) {
    return 'Mulai ${formatPromoDate(promo.startDate)}';
  }
  final daysLeft = promoDaysLeft(promo);
  if (daysLeft <= 0) return 'Berakhir hari ini';
  if (daysLeft <= promoEndingSoonDays) return 'Berakhir $daysLeft hari lagi';
  return 's/d ${formatPromoDate(promo.endDate)}';
}

/// Ikon 3D sesuai hadiah promo.
class PromoTypeIcon extends StatelessWidget {
  const PromoTypeIcon({super.key, required this.type, this.size = 32});

  final PromoType type;
  final double size;

  @override
  Widget build(BuildContext context) {
    return switch (type) {
      PromoType.point => WalletCurrencyIcon(
        currency: WalletCurrency.point,
        size: size,
      ),
      PromoType.coin => WalletCurrencyIcon(
        currency: WalletCurrency.coin,
        size: size,
      ),
      PromoType.reward => Assets.icons.enakrewardIcon.image(
        width: size,
        height: size,
        fit: BoxFit.contain,
        // Aset aslinya besar; decode seukuran tampilan saja.
        cacheWidth: (size * MediaQuery.devicePixelRatioOf(context)).round(),
      ),
    };
  }
}

/// Label waktu promo: biru bila belum mulai, oranye bila segera berakhir.
class PromoTimeBadge extends StatelessWidget {
  const PromoTimeBadge({super.key, required this.promo});

  final Promo promo;

  @override
  Widget build(BuildContext context) {
    final color = isPromoUpcoming(promo)
        ? AppColor.info
        : isPromoEndingSoon(promo)
        ? AppColor.warning
        : AppColor.textSecondary;

    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
      decoration: BoxDecoration(
        color: color.withOpacity(0.1),
        borderRadius: BorderRadius.circular(20),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(Icons.schedule, size: 12, color: color),
          const SizedBox(width: 4),
          Text(
            promoTimeLabel(promo),
            style: AppStyle.xs.copyWith(
              color: color,
              fontWeight: FontWeight.w700,
            ),
          ),
        ],
      ),
    );
  }
}