import 'package:flutter/services.dart';

/// Thin Dart wrapper over the native DJI Mobile SDK bridge.
///
/// Mirrors the channels defined in `DjiSdkBridge.kt`:
///  * method channel `dji_msdk/methods` for imperative calls
///  * event  channel `dji_msdk/events`  for the SDK's async updates
class DjiService {
  static const MethodChannel _methods = MethodChannel('dji_msdk/methods');
  static const EventChannel _events = EventChannel('dji_msdk/events');

  /// Broadcast stream of SDK events. Each event is a map with a `type` key:
  /// `registration`, `connection`, `telemetry`, `battery`, `database`, `init`.
  Stream<Map<String, dynamic>> events() {
    return _events
        .receiveBroadcastStream()
        .map((dynamic e) => Map<String, dynamic>.from(e as Map));
  }

  Future<String> getSdkVersion() async {
    return await _methods.invokeMethod<String>('getSdkVersion') ?? 'unknown';
  }

  /// Kicks off DJI app registration (requires a valid App Key + internet).
  Future<void> registerApp() => _methods.invokeMethod<void>('registerApp');

  /// Starts scanning for a connected product (USB remote controller / Wi-Fi).
  Future<bool> startConnection() async {
    return await _methods.invokeMethod<bool>('startConnection') ?? false;
  }

  Future<void> stopConnection() =>
      _methods.invokeMethod<void>('stopConnection');

  Future<Map<String, dynamic>> getProductInfo() async {
    final dynamic info = await _methods.invokeMethod('getProductInfo');
    return Map<String, dynamic>.from(info as Map);
  }
}