import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:tsnet_flutter/tsnet_flutter.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  test('status exposes stable node ID and chooses IPv4', () {
    final status = TailscaleStatus.fromJson({
      'BackendState': 'Running',
      'Self': {
        'ID': 'node-stable-id',
        'TailscaleIPs': ['fd7a:115c:a1e0::1', '100.100.10.20'],
      },
    });

    expect(status.isRunning, isTrue);
    expect(status.selfNodeId, 'node-stable-id');
    expect(status.selfIP, '100.100.10.20');
  });

  test('status does not expose IPv6 as the enrollment address', () {
    final status = TailscaleStatus.fromJson({
      'BackendState': 'Running',
      'Self': {
        'ID': 'node-stable-id',
        'TailscaleIPs': ['fd7a:115c:a1e0::1'],
      },
    });

    expect(status.selfIP, isNull);
  });

  group('proxy handles over the method channel', () {
    const channel = MethodChannel('tsnet_flutter');
    late TsnetFlutter tsnet;
    late List<MethodCall> calls;
    late int nextHandle;

    setUp(() {
      tsnet = TsnetFlutter();
      calls = [];
      nextHandle = 0;
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(channel, (call) async {
            calls.add(call);
            switch (call.method) {
              case 'startProxyHandle':
                nextHandle++;
                return {'handle': nextHandle, 'localPort': 50000 + nextHandle};
              case 'stopProxyHandle':
                return null;
              case 'startProxy':
                return 61000;
              case 'stopProxy':
                return null;
            }
            throw MissingPluginException(call.method);
          });
    });

    tearDown(() {
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(channel, null);
    });

    test(
      'startProxyHandle passes the remote and returns handle plus port',
      () async {
        final proxy = await tsnet.startProxyHandle('100.64.0.5', port: 5050);

        expect(proxy.id, 1);
        expect(proxy.localPort, 50001);
        expect(calls, hasLength(1));
        expect(calls.single.method, 'startProxyHandle');
        expect(calls.single.arguments, {'ip': '100.64.0.5', 'port': 5050});
      },
    );

    test('concurrent starts return independent handles', () async {
      final a = await tsnet.startProxyHandle('100.64.0.5');
      final b = await tsnet.startProxyHandle('100.64.0.6');
      final c = await tsnet.startProxyHandle('100.64.0.7');

      expect({a.id, b.id, c.id}, hasLength(3));
      expect({a.localPort, b.localPort, c.localPort}, hasLength(3));
      expect(calls.map((c) => c.method), everyElement('startProxyHandle'));
    });

    test('stopProxyHandle stops exactly the given handle', () async {
      final a = await tsnet.startProxyHandle('100.64.0.5');
      final b = await tsnet.startProxyHandle('100.64.0.6');

      await tsnet.stopProxyHandle(a);

      final stops = calls.where((c) => c.method == 'stopProxyHandle');
      expect(stops, hasLength(1));
      expect(stops.single.arguments, {'handle': a.id});
      expect(b.id, isNot(a.id));
    });

    test('legacy startProxy and stopProxy keep their wire contract', () async {
      final port = await tsnet.startProxy('100.64.0.5', port: 5050);
      await tsnet.stopProxy();

      expect(port, 61000);
      expect(calls, hasLength(2));
      expect(calls[0].method, 'startProxy');
      expect(calls[0].arguments, {'ip': '100.64.0.5', 'port': 5050});
      expect(calls[1].method, 'stopProxy');
      expect(calls[1].arguments, isNull);
    });

    test('proxy handles compare by value', () {
      const a = TsnetProxyHandle(id: 3, localPort: 50003);
      const b = TsnetProxyHandle(id: 3, localPort: 50003);
      const c = TsnetProxyHandle(id: 4, localPort: 50004);

      expect(a, b);
      expect(a.hashCode, b.hashCode);
      expect(a, isNot(c));
    });
  });

  group('pingPeer over the method channel', () {
    const channel = MethodChannel('tsnet_flutter');
    late TsnetFlutter tsnet;
    late List<MethodCall> calls;
    Object? pingError;

    setUp(() {
      tsnet = TsnetFlutter();
      calls = [];
      pingError = null;
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(channel, (call) async {
            calls.add(call);
            if (call.method == 'pingPeer') {
              if (pingError != null) throw pingError!;
              return null;
            }
            throw MissingPluginException(call.method);
          });
    });

    tearDown(() {
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(channel, null);
    });

    test('passes the peer IP and reports success as true', () async {
      final ok = await tsnet.pingPeer('100.64.0.5');

      expect(ok, isTrue);
      expect(calls, hasLength(1));
      expect(calls.single.method, 'pingPeer');
      expect(calls.single.arguments, {'ip': '100.64.0.5'});
    });

    test('a native error (node not up, timeout) becomes false', () async {
      pingError = PlatformException(
        code: 'PING_FAILED',
        message: 'not started, call TailscaleStart() first',
      );

      final ok = await tsnet.pingPeer('100.64.0.5');

      expect(ok, isFalse);
      expect(calls.single.method, 'pingPeer');
    });
  });

  group('recoverPaths over the method channel', () {
    const channel = MethodChannel('tsnet_flutter');
    late TsnetFlutter tsnet;
    late List<MethodCall> calls;
    Object? recoverError;

    setUp(() {
      tsnet = TsnetFlutter();
      calls = [];
      recoverError = null;
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(channel, (call) async {
            calls.add(call);
            if (call.method == 'recoverPaths') {
              if (recoverError != null) throw recoverError!;
              return null;
            }
            throw MissingPluginException(call.method);
          });
    });

    tearDown(() {
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(channel, null);
    });

    test('invokes recoverPaths with no arguments', () async {
      await tsnet.recoverPaths();

      expect(calls, hasLength(1));
      expect(calls.single.method, 'recoverPaths');
      expect(calls.single.arguments, isNull);
    });

    test('a stopped node surfaces as a PlatformException', () async {
      recoverError = PlatformException(
        code: 'RECOVER_FAILED',
        message: 'not started, call TailscaleStart() first',
      );

      expect(
        () => tsnet.recoverPaths(),
        throwsA(
          isA<PlatformException>().having(
            (e) => e.code,
            'code',
            'RECOVER_FAILED',
          ),
        ),
      );
    });
  });

  group('start over the method channel', () {
    const channel = MethodChannel('tsnet_flutter');
    late TsnetFlutter tsnet;
    late List<MethodCall> calls;

    setUp(() {
      tsnet = TsnetFlutter();
      calls = [];
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(channel, (call) async {
            calls.add(call);
            if (call.method == 'start') return null;
            throw MissingPluginException(call.method);
          });
    });

    tearDown(() {
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(channel, null);
    });

    test('debugNetLogging defaults to off', () async {
      await tsnet.start(hostname: 'bench');

      expect(calls.single.method, 'start');
      expect(calls.single.arguments, {
        'authKey': '',
        'hostname': 'bench',
        'debugNetLogging': false,
      });
    });

    test('debugNetLogging is passed through when requested', () async {
      await tsnet.start(hostname: 'bench', debugNetLogging: true);

      expect(calls.single.arguments, {
        'authKey': '',
        'hostname': 'bench',
        'debugNetLogging': true,
      });
    });
  });
}