import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../core/providers/bt_provider.dart';

/// Thin banner under the app bar that tells the driver when the numbers on
/// screen are NOT live, instead of silently showing stale or default values.
class DataStatusBanner extends ConsumerWidget {
  const DataStatusBanner({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final status = ref.watch(btProvider.select((s) => s.status));
    final data = ref.watch(btProvider.select((s) => s.dataStatus));
    final error = ref.watch(btProvider.select((s) => s.error));

    final String? msg;
    Color color = const Color(0xFF8A5A00);
    if (status == BtStatus.reconnecting) {
      msg = 'Connection interrupted — reconnecting…';
    } else if (status == BtStatus.error) {
      msg = error ?? 'Connection lost';
      color = const Color(0xFF7A0000);
    } else if (status == BtStatus.disconnected) {
      msg = 'Not connected';
      color = const Color(0xFF444444);
    } else if (status != BtStatus.connected) {
      msg = null;
    } else {
      msg = switch (data) {
        EcuDataStatus.live => null,
        EcuDataStatus.none => 'Connected — waiting for data…',
        EcuDataStatus.adapterDefaults =>
          'Adapter connected, but no data from the ECU (ignition on?)',
        EcuDataStatus.noResponse => 'Adapter is not responding',
      };
    }

    if (msg == null) return const SizedBox.shrink();
    return Material(
      color: color,
      child: SizedBox(
        width: double.infinity,
        child: Padding(
          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
          child: Text(
            msg,
            style: const TextStyle(color: Colors.white, fontSize: 12),
          ),
        ),
      ),
    );
  }
}