import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../../core/protocol/dtc_map.dart';
import '../../../core/providers/sensor_provider.dart';
import '../../../core/providers/settings_provider.dart';
import '../../../core/bluetooth/bt_poller.dart';
import 'widgets/dtc_row.dart';

class DtcScreen extends ConsumerWidget {
  const DtcScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final state = ref.watch(latestSensorProvider);
    final ecuType = ref.watch(settingsProvider).ecuType;

    final dtcMap =
        ecuType == EcuType.s300 ? s300DtcMap : kproDtcMap;
    final active = decodeDtcs(state.errBytes, dtcMap);

    return Column(
      children: [
        // Header bar
        Container(
          color: const Color(0xFF1A1A1A),
          padding:
              const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
          child: Row(
            children: [
              Icon(
                active.isEmpty
                    ? Icons.check_circle_outline
                    : Icons.warning_amber_rounded,
                color: active.isEmpty ? Colors.green : Colors.amber,
                size: 18,
              ),
              const SizedBox(width: 8),
              Text(
                active.isEmpty
                    ? 'No active fault codes'
                    : '${active.length} active DTC${active.length > 1 ? "s" : ""}',
                style: TextStyle(
                  color: active.isEmpty ? Colors.green : Colors.amber,
                  fontSize: 13,
                  fontWeight: FontWeight.w600,
                ),
              ),
              const Spacer(),
              Text(
                ecuType == EcuType.s300 ? 'S300' : 'KPro',
                style:
                    const TextStyle(color: Colors.grey, fontSize: 12),
              ),
            ],
          ),
        ),
        const Divider(height: 1, color: Colors.white10),

        // DTC list
        Expanded(
          child: active.isEmpty
              ? const Center(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Icon(Icons.check_circle_outline,
                          size: 56, color: Colors.green),
                      SizedBox(height: 12),
                      Text('All clear — no fault codes',
                          style: TextStyle(
                              color: Colors.grey, fontSize: 15)),
                    ],
                  ),
                )
              : ListView.separated(
                  itemCount: active.length,
                  separatorBuilder: (_, __) =>
                      const Divider(height: 1, color: Colors.white10),
                  itemBuilder: (context, i) {
                    final full = active[i]; // "P0130 — O2 Sensor (front)"
                    final parts = full.split(' — ');
                    final code = parts.first.trim();
                    final desc =
                        parts.length > 1 ? parts.sublist(1).join(' — ') : '';
                    return DtcRow(code: code, description: desc);
                  },
                ),
        ),
      ],
    );
  }
}