import 'dart:async';
import 'package:flutter_riverpod/flutter_riverpod.dart';

enum ElectricalHealthStatus {
  normal,
  lowVoltageWarning,
  overchargingWarning,
  chargingSystemAnomaly,
  disconnected,
}

class ElectricalTelemetry {
  final DateTime timestamp;
  final double batteryVoltage; // Volts (e.g. 12.6V resting, 14.2V charging)
  final double? chargingCurrent; // Amps (if sensor supported)
  final ElectricalHealthStatus healthStatus;
  final String? diagnosticMessage;

  const ElectricalTelemetry({
    required this.timestamp,
    required this.batteryVoltage,
    this.chargingCurrent,
    required this.healthStatus,
    this.diagnosticMessage,
  });

  bool get isCharging => batteryVoltage >= 13.5;
  bool get isUnderVoltage => batteryVoltage < 11.8;
  bool get isOverVoltage => batteryVoltage > 15.2;
}

abstract class MotorcycleElectricalService {
  Stream<ElectricalTelemetry> get electricalStream;
  ElectricalTelemetry? get latestReading;
  bool get isConnected;

  Future<bool> connectBleSensor(String deviceAddress);
  Future<void> disconnect();
}

/// Production stub / Mock implementation for pre-sensor readiness
class MockMotorcycleElectricalService implements MotorcycleElectricalService {
  final _controller = StreamController<ElectricalTelemetry>.broadcast();
  ElectricalTelemetry? _latest;
  bool _connected = false;

  @override
  Stream<ElectricalTelemetry> get electricalStream => _controller.stream;

  @override
  ElectricalTelemetry? get latestReading => _latest;

  @override
  bool get isConnected => _connected;

  @override
  Future<bool> connectBleSensor(String deviceAddress) async {
    _connected = true;
    _latest = ElectricalTelemetry(
      timestamp: DateTime.now(),
      batteryVoltage: 14.2,
      healthStatus: ElectricalHealthStatus.normal,
      diagnosticMessage: 'Regulator/Rectifier active (14.2V nominal charging)',
    );
    _controller.add(_latest!);
    return true;
  }

  @override
  Future<void> disconnect() async {
    _connected = false;
    _latest = null;
  }

  void dispose() {
    _controller.close();
  }
}

final motorcycleElectricalServiceProvider = Provider<MotorcycleElectricalService>((ref) {
  return MockMotorcycleElectricalService();
});