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

import '../../../common/theme/theme.dart';
import '../../../sample/reward_sample_data.dart';

/// Reward aktif dengan sisa masa berlaku segini dianggap segera berakhir.
const int rewardExpiringSoonDays = 7;

extension RewardStatusUi on RewardStatus {
  String get label => switch (this) {
    RewardStatus.active => 'Aktif',
    RewardStatus.used => 'Terpakai',
    RewardStatus.expired => 'Kedaluwarsa',
  };

  Color get color => switch (this) {
    RewardStatus.active => AppColor.success,
    RewardStatus.used => AppColor.textSecondary,
    RewardStatus.expired => AppColor.error,
  };
}

/// Tanggal pendek: "1 Okt 2026".
String formatRewardDate(DateTime date) =>
    DateFormat('d MMM yyyy', 'id_ID').format(date);

/// Sisa hari kalender sampai [Reward.validUntil]; 0 berarti berakhir hari ini.
int rewardDaysLeft(Reward reward) {
  final now = DateTime.now();
  final today = DateTime(now.year, now.month, now.day);
  final end = DateTime(
    reward.validUntil.year,
    reward.validUntil.month,
    reward.validUntil.day,
  );
  return end.difference(today).inDays;
}

bool isRewardExpiringSoon(Reward reward) =>
    reward.status == RewardStatus.active &&
    rewardDaysLeft(reward) <= rewardExpiringSoonDays;

/// "Berakhir hari ini" / "Berakhir 3 hari lagi" / "Berlaku s/d 25 Okt 2026".
String rewardValidityLabel(Reward reward) {
  final daysLeft = rewardDaysLeft(reward);
  if (daysLeft <= 0) return 'Berakhir hari ini';
  if (daysLeft <= rewardExpiringSoonDays) {
    return 'Berakhir $daysLeft hari lagi';
  }
  return 'Berlaku s/d ${formatRewardDate(reward.validUntil)}';
}

class RewardStatusBadge extends StatelessWidget {
  const RewardStatusBadge({super.key, required this.status});

  final RewardStatus status;

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
      decoration: BoxDecoration(
        color: status.color.withOpacity(0.1),
        borderRadius: BorderRadius.circular(20),
      ),
      child: Text(
        status.label,
        style: AppStyle.xs.copyWith(
          color: status.color,
          fontWeight: FontWeight.w700,
        ),
      ),
    );
  }
}

/// Emoji reward; abu-abu untuk reward yang sudah tidak bisa dipakai.
class RewardEmoji extends StatelessWidget {
  const RewardEmoji({super.key, required this.reward, required this.size});

  final Reward reward;
  final double size;

  static const ColorFilter _greyscale = ColorFilter.matrix([
    0.2126, 0.7152, 0.0722, 0, 0, //
    0.2126, 0.7152, 0.0722, 0, 0, //
    0.2126, 0.7152, 0.0722, 0, 0, //
    0, 0, 0, 0.5, 0, //
  ]);

  @override
  Widget build(BuildContext context) {
    final emoji = Text(reward.emoji, style: TextStyle(fontSize: size));
    if (reward.status == RewardStatus.active) return emoji;
    return ColorFiltered(colorFilter: _greyscale, child: emoji);
  }
}