import 'dart:async';

import 'package:clide/builtin/graph/src/graph_panel.dart';
import 'package:clide/builtin/graph/src/graph_view.dart';
import 'package:clide/clide.dart';
import 'package:clide/widgets/widgets.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';

import '../../helpers/kernel_fixture.dart';
import '../../helpers/widget_harness.dart';

void main() {
  late KernelFixture f;
  setUp(() async => f = await KernelFixture.create());
  tearDown(() => f.dispose());

  IpcResponse ok(Map<String, Object?> data) => IpcResponse.ok(id: '1', data: data);

  /// Stubs `pql.files` (from the map's keys) and `pql.outlinks` (per path).
  void stubVault(Map<String, List<String>> vault) {
    f.ipc.stub(
      'pql.files',
      (_) async => ok({
        'files': [
          for (final p in vault.keys) {'path': p},
        ],
      }),
    );
    f.ipc.stub('pql.outlinks', (args) async {
      final links = vault[args['path'] as String?] ?? const [];
      return ok({
        'links': [
          for (final t in links) {'target': t},
        ],
      });
    });
  }

  Widget panel([Size size = const Size(400, 400)]) => anchoredHarness(f, SizedBox(width: size.width, height: size.height, child: const GraphPanel()));

  testWidgets('shows a spinner while the first load is in flight', (tester) async {
    // A never-completing pql.files keeps the panel in its loading state.
    f.ipc.stub('pql.files', (_) => Completer<IpcResponse>().future);
    await tester.pumpWidget(panel());
    await tester.pump();
    expect(find.byType(ClideSpinner), findsOneWidget);
    expect(find.byType(GraphView), findsNothing);
  });

  testWidgets('renders the graph once loaded', (tester) async {
    stubVault({
      'a.md': ['b.md'],
      'b.md': [],
    });
    await tester.pumpWidget(panel());
    await pumpAsync(tester);
    expect(find.byType(GraphView), findsOneWidget);
    expect(find.byType(ClideSpinner), findsNothing);
  });

  testWidgets('shows an empty message for a vault with no notes', (tester) async {
    stubVault(const {});
    await tester.pumpWidget(panel());
    await pumpAsync(tester);
    expect(find.text('No linked notes in this vault.'), findsOneWidget);
    expect(find.byType(GraphView), findsNothing);
  });

  testWidgets('surfaces a load error', (tester) async {
    f.ipc.stub(
      'pql.files',
      (_) async => IpcResponse.err(
        id: '1',
        error: IpcError(code: IpcExitCode.toolError, kind: IpcErrorKind.toolError, message: 'index locked'),
      ),
    );
    await tester.pumpWidget(panel());
    await pumpAsync(tester);
    expect(find.text('index locked'), findsOneWidget);
    expect(find.byType(GraphView), findsNothing);
  });

  testWidgets('clicking a node opens it in the editor', (tester) async {
    stubVault({'only.md': const []});
    String? opened;
    f.ipc.stub('editor.open', (args) async {
      opened = args['path'] as String?;
      return ok(const {});
    });
    await tester.pumpWidget(panel());
    await pumpAsync(tester);
    // A single node lays out at the layout centre → a square canvas maps it to
    // the view's centre, which is where a byType tap lands.
    await tester.tap(find.byType(GraphView));
    await pumpAsync(tester);
    expect(opened, 'only.md');
  });
}