import 'package:flutter/services.dart';

/// BatteryManager 实时数据（电池端：电压 / 电流 / 功率）
class BatteryManagerData {
  final int voltageMv;
  final int currentUa;
  final double powerW;
  final double temperatureC;
  final int plugged; // 0=未插, 1=AC, 2=USB, 4=WIRELESS
  final bool isCharging;

  const BatteryManagerData({
    required this.voltageMv,
    required this.currentUa,
    required this.powerW,
    required this.temperatureC,
    required this.plugged,
    required this.isCharging,
  });

  factory BatteryManagerData.empty() => const BatteryManagerData(
    voltageMv: 0,
    currentUa: 0,
    powerW: 0,
    temperatureC: 0,
    plugged: 0,
    isCharging: false,
  );

  factory BatteryManagerData.fromMap(dynamic raw) {
    if (raw is! Map) return BatteryManagerData.empty();
    return BatteryManagerData(
      voltageMv: (raw['voltageMv'] as num?)?.toInt() ?? 0,
      currentUa: (raw['currentUa'] as num?)?.toInt() ?? 0,
      powerW: (raw['powerW'] as num?)?.toDouble() ?? 0.0,
      temperatureC: (raw['temperatureC'] as num?)?.toDouble() ?? 0.0,
      plugged: (raw['plugged'] as num?)?.toInt() ?? 0,
      isCharging: raw['isCharging'] as bool? ?? false,
    );
  }

  /// 电压 V
  double get voltageV => voltageMv / 1000.0;

  /// 电流 A
  double get currentA => currentUa / 1_000_000.0;
}

class BatteryManagerService {
  static const _channel = MethodChannel('com.lxh.battery_health/charge');

  /// 主动拉取一次
  static Future<BatteryManagerData> fetch() async {
    final result = await _channel.invokeMethod('getBatteryManagerData');
    return BatteryManagerData.fromMap(result);
  }
}