import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:muzzle_velocity/note_editor.dart';
import 'note_list_harness.dart';

Future<void> _press(WidgetTester tester, LogicalKeyboardKey key) async {
  await tester.sendKeyEvent(key);
  await tester.pumpAndSettle();
}

void main() {
  setUp(() => setUpNotes({
        for (final name in ['alpha', 'beta', 'gamma']) '$name.md': '# $name\n',
      }));

  bool searchHasFocus(WidgetTester tester) =>
      tester.widget<TextField>(find.byType(TextField)).focusNode!.hasFocus;

  List<String> highlighted(WidgetTester tester) => [
        for (final tile in tester.widgetList<ListTile>(find.byType(ListTile)))
          if (tile.selected) (tile.title as Text).data!,
      ];

  testWidgets('Down enters the list, Up and Left return to the search field',
      (tester) async {
    await pumpList(tester);
    expect(searchHasFocus(tester), isTrue);

    await _press(tester, LogicalKeyboardKey.arrowDown);
    expect(searchHasFocus(tester), isFalse);
    expect(highlighted(tester), hasLength(1));
    final first = highlighted(tester).single;

    await _press(tester, LogicalKeyboardKey.arrowDown);
    expect(highlighted(tester).single, isNot(first));

    await _press(tester, LogicalKeyboardKey.arrowUp);
    expect(highlighted(tester).single, first);

    await _press(tester, LogicalKeyboardKey.arrowUp);
    expect(searchHasFocus(tester), isTrue);
    expect(highlighted(tester), isEmpty);

    await _press(tester, LogicalKeyboardKey.arrowDown);
    await _press(tester, LogicalKeyboardKey.arrowLeft);
    expect(searchHasFocus(tester), isTrue);
    expect(highlighted(tester), isEmpty);
  });

  testWidgets('Right clears the search text, then opens the menu',
      (tester) async {
    await pumpList(tester);
    await tester.enterText(find.byType(TextField), 'alp');
    await tester.pumpAndSettle();

    await _press(tester, LogicalKeyboardKey.arrowRight);
    expect(find.text('alp'), findsNothing);

    await _press(tester, LogicalKeyboardKey.arrowRight);
    expect(find.text('About'), findsOneWidget);
  });

  testWidgets('Right in the list opens the menu with D-pad navigation',
      (tester) async {
    await pumpList(tester);
    await _press(tester, LogicalKeyboardKey.arrowDown);
    await _press(tester, LogicalKeyboardKey.arrowRight);
    expect(find.text('About'), findsOneWidget);

    // The first item has focus, so moving down and selecting picks the second.
    await _press(tester, LogicalKeyboardKey.arrowDown);
    await _press(tester, LogicalKeyboardKey.select);
    expect(find.text('About'), findsNothing);
  });

  testWidgets('center opens the highlighted note', (tester) async {
    await pumpList(tester);
    await _press(tester, LogicalKeyboardKey.arrowDown);
    // The note reads its file with real I/O, so let it finish between frames.
    await tester.runAsync(() async {
      await tester.sendKeyEvent(LogicalKeyboardKey.select);
      for (var i = 0; i < 10; i++) {
        await tester.pump(const Duration(milliseconds: 50));
        await Future<void>.delayed(const Duration(milliseconds: 20));
      }
    });
    expect(find.byType(NoteEditorScreen), findsOneWidget);
    final editor = tester.widget<TextField>(find.descendant(
        of: find.byType(NoteEditorScreen), matching: find.byType(TextField)));
    expect(editor.controller!.text, matches(r'^# (alpha|beta|gamma)\n$'));
  });
}