import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:image/image.dart' as img;
import 'package:imajviewer/widgets/image_canvas.dart';

/// Aynalama uygulandiginda render zincirinde negatif x olcekli bir Transform bulunur.
bool _mirrored(WidgetTester tester) => tester
    .widgetList<Transform>(find.byType(Transform))
    .any((t) => t.transform.entry(0, 0) < 0);

Future<void> _pressR(WidgetTester tester) async {
  await tester.sendKeyDownEvent(LogicalKeyboardKey.keyR);
  await tester.sendKeyUpEvent(LogicalKeyboardKey.keyR);
  await tester.pump();
  await tester.pump();
}

void main() {
  late Directory tmp;
  late String pngPath;

  setUpAll(() {
    tmp = Directory.systemTemp.createTempSync('flip_test');
    pngPath = '${tmp.path}/a.png';
    File(pngPath).writeAsBytesSync(img.encodePng(img.Image(width: 4, height: 2))!);
  });

  tearDownAll(() => tmp.deleteSync(recursive: true));

  testWidgets('R yatay aynalamayi acar, tekrar basinca kapatir', (tester) async {
    await tester.pumpWidget(MaterialApp(
      home: SizedBox(
        width: 400,
        height: 300,
        child: ImageCanvas(filePath: pngPath),
      ),
    ));
    await tester.pump();

    expect(_mirrored(tester), isFalse, reason: 'baslangicta aynalama olmamali');

    await _pressR(tester);
    expect(_mirrored(tester), isTrue, reason: 'R sonrasi aynalama acik olmali');

    await _pressR(tester);
    expect(_mirrored(tester), isFalse, reason: 'ikinci R sonrasi eski haline donmeli');
  });
}