import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:go_router/go_router.dart';
import 'package:random_avatar/random_avatar.dart';

import '../../../../core/theme/app_theme.dart';
import '../../../../core/widgets/game_ui.dart';
import '../../../../core/widgets/rank_badge.dart';
import '../../domain/entities/leaderboard.dart';
import '../bloc/leaderboard_bloc.dart';

/// جدولِ رتبه‌بندیِ فصل: برترین بازیکنان بر اساس امتیازِ رتبه.
class LeaderboardScreen extends StatelessWidget {
  const LeaderboardScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: GameBackground(
        child: SafeArea(
          child: Column(
            children: [
              Row(children: [
                IconButton(
                  onPressed: () => context.pop(),
                  icon: const Icon(Icons.arrow_back, color: AppColors.gold),
                ),
                const Spacer(),
                const GlowText('رتبه‌بندی فصل', size: 22),
                const Spacer(),
                const SizedBox(width: 48),
              ]),
              Expanded(
                child: BlocBuilder<LeaderboardBloc, LeaderboardState>(
                  builder: (context, state) {
                    if (state is LeaderboardError) {
                      return Center(
                        child: Column(mainAxisSize: MainAxisSize.min, children: [
                          Text(state.message,
                              style: const TextStyle(color: Colors.white70)),
                          TextButton(
                            onPressed: () => context
                                .read<LeaderboardBloc>()
                                .add(LoadLeaderboardEvent()),
                            child: const Text('تلاش مجدد'),
                          ),
                        ]),
                      );
                    }
                    if (state is! LeaderboardLoaded) {
                      return const Center(
                          child:
                              CircularProgressIndicator(color: AppColors.gold));
                    }
                    final lb = state.data;
                    if (lb.entries.isEmpty) {
                      return const Center(
                        child: Text('هنوز کسی در این فصل امتیاز نگرفته است',
                            style: TextStyle(color: Colors.white54)),
                      );
                    }
                    return Column(
                      children: [
                        Padding(
                          padding: const EdgeInsets.symmetric(vertical: 6),
                          child: Text('فصل ${lb.season}',
                              style: const TextStyle(
                                  color: AppColors.gold, fontSize: 14)),
                        ),
                        Expanded(
                          child: ListView.separated(
                            padding: const EdgeInsets.fromLTRB(12, 4, 12, 20),
                            itemCount: lb.entries.length,
                            separatorBuilder: (_, __) =>
                                const SizedBox(height: 8),
                            itemBuilder: (_, i) => _row(lb.entries[i]),
                          ),
                        ),
                      ],
                    );
                  },
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  Widget _row(RankEntry e) {
    final medal = e.rank <= 3;
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
      decoration: BoxDecoration(
        gradient: const LinearGradient(
          colors: [Color(0xFF4A0C16), Color(0xFF2A0710)],
        ),
        borderRadius: BorderRadius.circular(12),
        border: Border.all(
            color: medal ? AppColors.gold : AppColors.goldDark,
            width: medal ? 1.6 : 1),
      ),
      child: Row(children: [
        SizedBox(
          width: 28,
          child: Text('${e.rank}',
              textAlign: TextAlign.center,
              style: TextStyle(
                  color: medal ? AppColors.gold : Colors.white70,
                  fontWeight: FontWeight.bold,
                  fontSize: 16)),
        ),
        const SizedBox(width: 8),
        SizedBox(
          width: 40,
          height: 40,
          child: ClipOval(
              child: RandomAvatar(e.avatar.isEmpty ? e.name : e.avatar)),
        ),
        const SizedBox(width: 10),
        Expanded(
          child: Text(e.name,
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
              style: const TextStyle(color: Colors.white, fontSize: 15)),
        ),
        RankBadge(tier: e.tier, points: e.rankPoints, size: 13),
      ]),
    );
  }
}