// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:convert' show utf8, json;
import 'dart:isolate';
import 'dart:typed_data';
import 'dart:ui';

void main() {}

void nativeReportTimingsCallback(List<int> timings) native 'NativeReportTimingsCallback';
void nativeOnBeginFrame(int microseconds) native 'NativeOnBeginFrame';
void nativeOnPointerDataPacket(List<int> sequences) native 'NativeOnPointerDataPacket';

@pragma('vm:entry-point')
void onErrorA() {
  PlatformDispatcher.instance.onError = (Object error, StackTrace? stack) {
    notifyErrorA(error.toString());
    return true;
  };
  Future<void>.delayed(const Duration(seconds: 2)).then((_) {
    throw Exception('I should be coming from A');
  });
}

@pragma('vm:entry-point')
void onErrorB() {
  PlatformDispatcher.instance.onError = (Object error, StackTrace? stack) {
    notifyErrorB(error.toString());
    return true;
  };
  throw Exception('I should be coming from B');
}

void notifyErrorA(String message) native 'NotifyErrorA';
void notifyErrorB(String message) native 'NotifyErrorB';

@pragma('vm:entry-point')
void drawFrames() {
  // Wait for native to tell us to start going.
  notifyNative();

  PlatformDispatcher.instance.onBeginFrame = (Duration beginTime) {
    final SceneBuilder builder = SceneBuilder();
    final PictureRecorder recorder = PictureRecorder();
    final Canvas canvas = Canvas(recorder);
    canvas.drawPaint(Paint()..color = const Color(0xFFABCDEF));
    final Picture picture = recorder.endRecording();
    builder.addPicture(Offset.zero, picture);

    final Scene scene = builder.build();
    window.render(scene);

    scene.dispose();
    picture.dispose();
  };
  PlatformDispatcher.instance.scheduleFrame();
}

@pragma('vm:entry-point')
void reportTimingsMain() {
  PlatformDispatcher.instance.onReportTimings = (List<FrameTiming> timings) {
    List<int> timestamps = [];
    for (FrameTiming t in timings) {
      for (FramePhase phase in FramePhase.values) {
        timestamps.add(t.timestampInMicroseconds(phase));
      }
    }
    nativeReportTimingsCallback(timestamps);
    PlatformDispatcher.instance.onReportTimings = (List<FrameTiming> timings) {};
  };
}

@pragma('vm:entry-point')
void onBeginFrameMain() {
  PlatformDispatcher.instance.onBeginFrame = (Duration beginTime) {
    nativeOnBeginFrame(beginTime.inMicroseconds);
  };
  PlatformDispatcher.instance.scheduleFrame();
}

@pragma('vm:entry-point')
void onPointerDataPacketMain() {
  PlatformDispatcher.instance.onPointerDataPacket = (PointerDataPacket packet) {
    List<int> sequence = <int>[];
    for (PointerData data in packet.data) {
      sequence.add(PointerChange.values.indexOf(data.change));
    }
    nativeOnPointerDataPacket(sequence);
  };
}

@pragma('vm:entry-point')
void emptyMain() {}

@pragma('vm:entry-point')
void reportMetrics() {
  window.onMetricsChanged = () {
    _reportMetrics(
      window.devicePixelRatio,
      window.physicalSize.width,
      window.physicalSize.height,
    );
  };
}

void _reportMetrics(double devicePixelRatio, double width, double height) native 'ReportMetrics';

@pragma('vm:entry-point')
void dummyReportTimingsMain() {
  PlatformDispatcher.instance.onReportTimings = (List<FrameTiming> timings) {};
}

@pragma('vm:entry-point')
void fixturesAreFunctionalMain() {
  sayHiFromFixturesAreFunctionalMain();
}

void sayHiFromFixturesAreFunctionalMain() native 'SayHiFromFixturesAreFunctionalMain';

@pragma('vm:entry-point')
void notifyNative() native 'NotifyNative';

@pragma('vm:entry-point')
void thousandCallsToNative() {
  for (int i = 0; i < 1000; i++) {
    notifyNative();
  }
}

void secondaryIsolateMain(String message) {
  print('Secondary isolate got message: ' + message);
  notifyNative();
}

@pragma('vm:entry-point')
void testCanLaunchSecondaryIsolate() {
  Isolate.spawn(secondaryIsolateMain, 'Hello from root isolate.');
  notifyNative();
}

@pragma('vm:entry-point')
void testSkiaResourceCacheSendsResponse() {
  final PlatformMessageResponseCallback callback = (ByteData? data) {
    if (data == null) {
      throw 'Response must not be null.';
    }
    final String response = utf8.decode(data.buffer.asUint8List());
    final List<bool> jsonResponse = json.decode(response).cast<bool>();
    if (jsonResponse[0] != true) {
      throw 'Response was not true';
    }
    notifyNative();
  };
  const String jsonRequest = '''{
                            "method": "Skia.setResourceCacheMaxBytes",
                            "args": 10000
                          }''';
  PlatformDispatcher.instance.sendPlatformMessage(
    'flutter/skia',
    Uint8List.fromList(utf8.encode(jsonRequest)).buffer.asByteData(),
    callback,
  );
}

void notifyWidthHeight(int width, int height) native 'NotifyWidthHeight';

@pragma('vm:entry-point')
void canCreateImageFromDecompressedData() {
  const int imageWidth = 10;
  const int imageHeight = 10;
  final Uint8List pixels = Uint8List.fromList(List<int>.generate(
    imageWidth * imageHeight * 4,
    (int i) => i % 4 < 2 ? 0x00 : 0xFF,
  ));

  decodeImageFromPixels(
    pixels,
    imageWidth,
    imageHeight,
    PixelFormat.rgba8888,
    (Image image) {
      notifyWidthHeight(image.width, image.height);
    },
  );
}

@pragma('vm:entry-point')
void canAccessIsolateLaunchData() {
  notifyMessage(
    utf8.decode(
      PlatformDispatcher.instance.getPersistentIsolateData()!.buffer.asUint8List(),
    ),
  );
}

void notifyMessage(String string) native 'NotifyMessage';

@pragma('vm:entry-point')
void canConvertMappings() {
  sendFixtureMapping(getFixtureMapping());
}

List<int> getFixtureMapping() native 'GetFixtureMapping';
void sendFixtureMapping(List<int> list) native 'SendFixtureMapping';

@pragma('vm:entry-point')
void canDecompressImageFromAsset() {
  decodeImageFromList(
    Uint8List.fromList(getFixtureImage()),
    (Image result) {
      notifyWidthHeight(result.width, result.height);
    },
  );
}

List<int> getFixtureImage() native 'GetFixtureImage';

@pragma('vm:entry-point')
void canRegisterImageDecoders() {
  decodeImageFromList(
    // The test ImageGenerator will always behave the same regardless of input.
    Uint8List(1),
    (Image result) {
      notifyWidthHeight(result.width, result.height);
    },
  );
}

void notifyLocalTime(String string) native 'NotifyLocalTime';

bool waitFixture() native 'WaitFixture';

// Return local date-time as a string, to an hour resolution.  So, "2020-07-23
// 14:03:22" will become "2020-07-23 14".
String localTimeAsString() {
   final now = DateTime.now().toLocal();
   // This is: "$y-$m-$d $h:$min:$sec.$ms$us";
   final timeStr = now.toString();
   // Forward only "$y-$m-$d $h" for timestamp comparison.  Not using DateTime
   // formatting since package:intl is not available.
  return timeStr.split(":")[0];
}

@pragma('vm:entry-point')
void localtimesMatch() {
  notifyLocalTime(localTimeAsString());
}

@pragma('vm:entry-point')
void timezonesChange() {
  do {
    notifyLocalTime(localTimeAsString());
  } while (waitFixture());
}

void notifyCanAccessResource(bool success) native 'NotifyCanAccessResource';

void notifySetAssetBundlePath() native 'NotifySetAssetBundlePath';

@pragma('vm:entry-point')
void canAccessResourceFromAssetDir() async {
  notifySetAssetBundlePath();
  window.sendPlatformMessage(
    'flutter/assets',
    Uint8List.fromList(utf8.encode('kernel_blob.bin')).buffer.asByteData(),
    (ByteData? byteData) {
      notifyCanAccessResource(byteData != null);
    },
  );
}

void notifyNativeWhenEngineRun(bool success) native 'NotifyNativeWhenEngineRun';

void notifyNativeWhenEngineSpawn(bool success) native 'NotifyNativeWhenEngineSpawn';

@pragma('vm:entry-point')
void canReceiveArgumentsWhenEngineRun(List<String> args) {
  notifyNativeWhenEngineRun(args.length == 2 && args[0] == 'foo' && args[1] == 'bar');
}

@pragma('vm:entry-point')
void canReceiveArgumentsWhenEngineSpawn(List<String> args) {
  notifyNativeWhenEngineSpawn(args.length == 2 && args[0] == 'arg1' && args[1] == 'arg2');
}

@pragma('vm:entry-point')
void onBeginFrameWithNotifyNativeMain() {
  PlatformDispatcher.instance.onBeginFrame = (Duration beginTime) {
    nativeOnBeginFrame(beginTime.inMicroseconds);
  };
  notifyNative();
}

@pragma('vm:entry-point')
void frameCallback(_Image, int) {
  // It is used as the frame callback of 'MultiFrameCodec' in the test
  // 'ItDoesNotCrashThatSkiaUnrefQueueDrainAfterIOManagerReset'.
  // The test is a regression test and doesn't care about images, so it is empty.
}

Picture CreateRedBox(Size size) {
  Paint paint = Paint()
    ..color = Color.fromARGB(255, 255, 0, 0)
    ..style = PaintingStyle.fill;
  PictureRecorder baseRecorder = PictureRecorder();
  Canvas canvas = Canvas(baseRecorder);
  canvas.drawRect(Rect.fromLTRB(0.0, 0.0, size.width, size.height), paint);
  return baseRecorder.endRecording();
}

@pragma('vm:entry-point')
void scene_with_red_box() {
  PlatformDispatcher.instance.onBeginFrame = (Duration duration) {
    SceneBuilder builder = SceneBuilder();
    builder.pushOffset(0.0, 0.0);
    builder.addPicture(Offset(0.0, 0.0), CreateRedBox(Size(2.0, 2.0)));
    builder.pop();
    PlatformDispatcher.instance.views.first.render(builder.build());
  };
  PlatformDispatcher.instance.scheduleFrame();
}


@pragma('vm:entry-point')
Future<void> toImageSync() async {
  final PictureRecorder recorder = PictureRecorder();
  final Canvas canvas = Canvas(recorder);
  canvas.drawPaint(Paint()..color = const Color(0xFFAAAAAA));
  final Picture picture = recorder.endRecording();

  final Image image = picture.toImageSync(20, 25);
  void expect(Object? a, Object? b) {
    if (a != b) {
      throw 'Expected $a to == $b';
    }
  }
  expect(image.width, 20);
  expect(image.height, 25);

  final ByteData dataBefore = (await image.toByteData())!;
  expect(dataBefore.lengthInBytes, 20 * 25 * 4);
  for (final int byte in dataBefore.buffer.asUint32List()) {
    expect(byte, 0xFFAAAAAA);
  }

  // Cause the rasterizer to get torn down.
  notifyNative();

  final ByteData dataAfter = (await image.toByteData())!;
  expect(dataAfter.lengthInBytes, 20 * 25 * 4);
  for (final int byte in dataAfter.buffer.asUint32List()) {
    expect(byte, 0xFFAAAAAA);
  }

  // Verify that the image can be drawn successfully.
  final PictureRecorder recorder2 = PictureRecorder();
  final Canvas canvas2 = Canvas(recorder2);
  canvas2.drawImage(image, Offset.zero, Paint());
  final Picture picture2 = recorder2.endRecording();

  picture.dispose();
  picture2.dispose();
  notifyNative();
}