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/shortcuts/app_shortcuts.dart';
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> _pressCtrlR(WidgetTester tester) async {
  await tester.sendKeyDownEvent(LogicalKeyboardKey.controlLeft);
  await tester.sendKeyDownEvent(LogicalKeyboardKey.keyR);
  await tester.pump();
  await tester.sendKeyUpEvent(LogicalKeyboardKey.keyR);
  await tester.sendKeyUpEvent(LogicalKeyboardKey.controlLeft);
  await tester.pump();
  await tester.pump();
}

Future<void> _pressCtrlRWrongLayout(WidgetTester tester) async {
  await tester.sendKeyDownEvent(LogicalKeyboardKey.controlLeft);
  await tester.sendKeyDownEvent(LogicalKeyboardKey.keyT,
      physicalKey: PhysicalKeyboardKey.keyR);
  await tester.pump();
  await tester.sendKeyUpEvent(LogicalKeyboardKey.keyT,
      physicalKey: PhysicalKeyboardKey.keyR);
  await tester.sendKeyUpEvent(LogicalKeyboardKey.controlLeft);
  await tester.pump();
  await tester.pump();
}

Widget _app(GlobalKey<ImageCanvasState> key, String path, double w, double h) {
  return MaterialApp(
    home: AppShortcuts(
      onFlipH: () => key.currentState?.toggleFlipH(),
      child: SizedBox(width: w, height: h, child: ImageCanvas(key: key, filePath: path)),
    ),
  );
}

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('Ctrl+R yatay aynalamayi acar, tekrar basinca kapatir', (tester) async {
    final key = GlobalKey<ImageCanvasState>();
    await tester.pumpWidget(_app(key, pngPath, 400, 300));
    await tester.pump();

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

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

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

  testWidgets('Ctrl+R crop-save parametrelerine aynalamayi tasir', (tester) async {
    final key = GlobalKey<ImageCanvasState>();
    await tester.pumpWidget(_app(key, pngPath, 100, 50));
    await tester.pump();
    await _pressCtrlR(tester);
    final vp = key.currentState!.cropViewParams(4, 2);
    expect(vp?.flipH, isTrue, reason: 'crop-save aynalamayi almali');
  });

  testWidgets('fiziksel R tusu mantiksal T olarak gelse de Ctrl+R calisir', (tester) async {
    final key = GlobalKey<ImageCanvasState>();
    await tester.pumpWidget(_app(key, pngPath, 400, 300));
    await tester.pump();

    await _pressCtrlRWrongLayout(tester);
    expect(_mirrored(tester), isTrue,
        reason: 'klavye haritasi R tusunu T olarak cozse bile aynalama acilmali');

    await _pressCtrlRWrongLayout(tester);
    expect(_mirrored(tester), isFalse, reason: 'tekrar basinca geri donmeli');
  });
}