import 'package:flutter_test/flutter_test.dart';
import 'package:supabase_flutter/supabase_flutter.dart';
import 'package:tasq/providers/realtime_controller.dart';
import 'package:tasq/providers/stream_recovery.dart';

// ---------------------------------------------------------------------------
// RealtimeController only accesses `_client.auth.onAuthStateChange` during
// `_init()`, which wraps the subscription in a try-catch. We use a minimal
// SupabaseClient pointed at localhost — the auth stream subscription will
// either return an empty stream or throw (caught internally), so no network
// activity occurs during tests.
// ---------------------------------------------------------------------------

void main() {
  group('RealtimeController', () {
    late RealtimeController controller;

    setUp(() {
      // SupabaseClient constructor does not connect eagerly; _init() catches
      // any exception thrown when accessing auth.onAuthStateChange.
      controller = RealtimeController(
        SupabaseClient('http://localhost', 'test-anon-key',
            authOptions: const AuthClientOptions(autoRefreshToken: false)),
      );
    });

    tearDown(() {
      controller.dispose();
    });

    // ── Initial state ───────────────────────────────────────────────────

    test('starts with no recovering channels', () {
      expect(controller.recoveringChannels, isEmpty);
      expect(controller.isAnyStreamRecovering, isFalse);
    });

    test('isChannelRecovering returns false for unknown channel', () {
      expect(controller.isChannelRecovering('tasks'), isFalse);
    });

    // ── markChannelRecovering ───────────────────────────────────────────

    test('markChannelRecovering adds channel to the set', () {
      controller.markChannelRecovering('tasks');

      expect(controller.isChannelRecovering('tasks'), isTrue);
      expect(controller.isAnyStreamRecovering, isTrue);
    });

    test('markChannelRecovering with multiple channels tracks all of them', () {
      controller.markChannelRecovering('tasks');
      controller.markChannelRecovering('tickets');

      expect(controller.isChannelRecovering('tasks'), isTrue);
      expect(controller.isChannelRecovering('tickets'), isTrue);
      expect(controller.recoveringChannels.length, 2);
    });

    test('markChannelRecovering notifies listeners exactly once per new channel',
        () {
      int notifyCount = 0;
      controller.addListener(() => notifyCount++);

      controller.markChannelRecovering('tasks');
      expect(notifyCount, 1);

      // Adding the same channel again must NOT trigger a second notification.
      controller.markChannelRecovering('tasks');
      expect(notifyCount, 1);
    });

    // ── markChannelRecovered ────────────────────────────────────────────

    test('markChannelRecovered removes channel from the set', () {
      controller.markChannelRecovering('tasks');
      controller.markChannelRecovered('tasks');

      expect(controller.isChannelRecovering('tasks'), isFalse);
      expect(controller.isAnyStreamRecovering, isFalse);
    });

    test('markChannelRecovered on unknown channel does not notify', () {
      int notifyCount = 0;
      controller.addListener(() => notifyCount++);

      // Recovering a channel that was never marked recovering is a no-op.
      controller.markChannelRecovered('nonexistent');
      expect(notifyCount, 0);
    });

    test('markChannelRecovered notifies listeners when channel is removed', () {
      controller.markChannelRecovering('tasks');

      int notifyCount = 0;
      controller.addListener(() => notifyCount++);

      controller.markChannelRecovered('tasks');
      expect(notifyCount, 1);
    });

    test('recovering two channels and recovering one leaves the other active',
        () {
      controller.markChannelRecovering('tasks');
      controller.markChannelRecovering('tickets');
      controller.markChannelRecovered('tasks');

      expect(controller.isChannelRecovering('tasks'), isFalse);
      expect(controller.isChannelRecovering('tickets'), isTrue);
      expect(controller.isAnyStreamRecovering, isTrue);
    });

    // ── recoveringChannels unmodifiable view ────────────────────────────

    test('recoveringChannels returns an unmodifiable set', () {
      controller.markChannelRecovering('tasks');
      final view = controller.recoveringChannels;

      expect(() => (view as dynamic).add('other'), throwsUnsupportedError);
    });

    // ── handleChannelStatus ─────────────────────────────────────────────

    test('handleChannelStatus with connected marks channel as recovered', () {
      controller.markChannelRecovering('tasks');
      controller.handleChannelStatus('tasks', StreamConnectionStatus.connected);

      expect(controller.isChannelRecovering('tasks'), isFalse);
    });

    test('handleChannelStatus with polling marks channel as recovered', () {
      controller.markChannelRecovering('tasks');
      controller.handleChannelStatus('tasks', StreamConnectionStatus.polling);

      expect(controller.isChannelRecovering('tasks'), isFalse);
    });

    test('handleChannelStatus with recovering marks channel as recovering', () {
      controller.handleChannelStatus(
          'tasks', StreamConnectionStatus.recovering);

      expect(controller.isChannelRecovering('tasks'), isTrue);
    });

    test('handleChannelStatus with stale marks channel as recovering', () {
      controller.handleChannelStatus('tasks', StreamConnectionStatus.stale);

      expect(controller.isChannelRecovering('tasks'), isTrue);
    });

    test('handleChannelStatus with failed marks channel as recovering', () {
      controller.handleChannelStatus('tasks', StreamConnectionStatus.failed);

      expect(controller.isChannelRecovering('tasks'), isTrue);
    });

    test('handleChannelStatus connected after recovering clears it', () {
      controller.handleChannelStatus(
          'tasks', StreamConnectionStatus.recovering);
      expect(controller.isAnyStreamRecovering, isTrue);

      controller.handleChannelStatus('tasks', StreamConnectionStatus.connected);
      expect(controller.isAnyStreamRecovering, isFalse);
    });

    // ── Legacy compat ───────────────────────────────────────────────────

    test('markStreamRecovering maps to _global channel', () {
      controller.markStreamRecovering();

      expect(controller.isChannelRecovering('_global'), isTrue);
      expect(controller.isAnyStreamRecovering, isTrue);
    });

    test('markStreamRecovered clears _global channel', () {
      controller.markStreamRecovering();
      controller.markStreamRecovered();

      expect(controller.isChannelRecovering('_global'), isFalse);
      expect(controller.isAnyStreamRecovering, isFalse);
    });

    // ── isAnyStreamRecovering aggregate ────────────────────────────────

    test('isAnyStreamRecovering is false only when all channels are recovered',
        () {
      controller.markChannelRecovering('a');
      controller.markChannelRecovering('b');
      controller.markChannelRecovered('a');

      expect(controller.isAnyStreamRecovering, isTrue);

      controller.markChannelRecovered('b');
      expect(controller.isAnyStreamRecovering, isFalse);
    });
  });
}