// Android only: binding the process to the USB (NCM) Ethernet link to the Orin.
// See MainActivity.kt for why Android needs telling.

import 'dart:io';

import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';

class UsbLink extends ChangeNotifier {
  static const _ch = MethodChannel('yukart/net');

  bool supported = Platform.isAndroid;
  bool up = false;
  bool bound = false;

  /// Development hook: a link test requested by launch intent (see MainActivity.kt).
  void Function(String label)? onLinkTest;

  UsbLink() {
    if (!supported) return;
    _ch.setMethodCallHandler((call) async {
      if (call.method == 'ethernet') {
        final a = Map<String, dynamic>.from(call.arguments as Map);
        up = a['up'] == true;
        bound = a['bound'] == true;
        notifyListeners();
      } else if (call.method == 'linktest') {
        onLinkTest?.call(call.arguments as String);
      }
    });
  }

  /// A link test requested by the intent that launched the app, once.
  Future<String?> takeLinkTest() async => supported ? _ch.invokeMethod<String>('takeLinkTest') : null;

  /// Bind only when the target is on the USB link; a workstation over WiFi must stay reachable.
  Future<void> bindFor(Uri target) async {
    if (!supported) return;
    final want = target.host.startsWith('192.168.55.');
    await _ch.invokeMethod<bool>('bindEthernet', want);
  }
}