// 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:async';
import 'dart:js_util' as js_util;
import 'dart:typed_data';

import 'package:test/bootstrap/browser.dart';
import 'package:test/test.dart';
import 'package:ui/src/engine.dart';
import 'package:ui/ui.dart' hide ImageShader, TextStyle;

import '../screenshot.dart';

void main() {
  internalBootstrapBrowserTest(() => testMain);
}

Future<void> testMain() async {
  const double screenWidth = 600.0;
  const double screenHeight = 800.0;
  const Rect screenRect = Rect.fromLTWH(0, 0, screenWidth, screenHeight);

  setUpAll(() async {
    debugEmulateFlutterTesterEnvironment = true;
    await webOnlyInitializePlatform();
    await renderer.fontCollection.debugDownloadTestFonts();
    renderer.fontCollection.registerDownloadedFonts();
  });

  setUp(() {
    GlContextCache.dispose();
    glRenderer = null;
  });

  Future<void> testVertices(
      String fileName, Vertices vertices, BlendMode blendMode, Paint paint) async {
    final RecordingCanvas rc =
        RecordingCanvas(const Rect.fromLTRB(0, 0, 500, 500));
    rc.drawVertices(
        vertices as SurfaceVertices, blendMode, paint as SurfacePaint);
    await canvasScreenshot(rc, fileName, canvasRect: screenRect);
  }

  test('Should draw green hairline triangles when colors array is null.',
      () async {
    final Vertices vertices = Vertices.raw(
        VertexMode.triangles,
        Float32List.fromList(<double>[
          20.0,
          20.0,
          220.0,
          10.0,
          110.0,
          220.0,
          220.0,
          320.0,
          20.0,
          310.0,
          200.0,
          420.0
        ]));
    await testVertices('draw_vertices_hairline_triangle', vertices,
        BlendMode.srcOver, Paint()..color = const Color.fromARGB(255, 0, 128, 0));
  });

  test(
      'Should draw black hairline triangles when colors array is null'
      ' and Paint() has no color.', () async {
    // ignore: unused_local_variable
    final Int32List colors = Int32List.fromList(<int>[
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF,
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF,
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF,
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF
    ]);
    final Vertices vertices = Vertices.raw(
        VertexMode.triangles,
        Float32List.fromList(<double>[
          20.0,
          20.0,
          220.0,
          10.0,
          110.0,
          220.0,
          220.0,
          320.0,
          20.0,
          310.0,
          200.0,
          420.0
        ]));
    await testVertices('draw_vertices_hairline_triangle_black', vertices,
        BlendMode.srcOver, Paint());
  });

  /// Regression test for https://github.com/flutter/flutter/issues/71442.
  test(
      'Should draw filled triangles when colors array is null'
      ' and Paint() has color.', () async {
    // ignore: unused_local_variable
    final Int32List colors = Int32List.fromList(<int>[
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF,
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF,
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF,
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF
    ]);
    final Vertices vertices = Vertices.raw(
        VertexMode.triangles,
        Float32List.fromList(<double>[
          20.0,
          20.0,
          220.0,
          10.0,
          110.0,
          220.0,
          220.0,
          320.0,
          20.0,
          310.0,
          200.0,
          420.0
        ]));
    await testVertices(
        'draw_vertices_triangle_green_filled',
        vertices,
        BlendMode.srcOver,
        Paint()
          ..style = PaintingStyle.fill
          ..color = const Color(0xFF00FF00));
  },
  // TODO(yjbanov): https://github.com/flutter/flutter/issues/86623
  skip: isFirefox);

  test('Should draw hairline triangleFan.', () async {
    final Vertices vertices = Vertices.raw(
        VertexMode.triangleFan,
        Float32List.fromList(<double>[
          150.0,
          150.0,
          20.0,
          10.0,
          80.0,
          20.0,
          220.0,
          15.0,
          280.0,
          30.0,
          300.0,
          420.0
        ]));

    await testVertices('draw_vertices_hairline_triangle_fan', vertices,
        BlendMode.srcOver, Paint()..color = const Color.fromARGB(255, 0, 128, 0));
  });

  test('Should draw hairline triangleStrip.', () async {
    final Vertices vertices = Vertices.raw(
        VertexMode.triangleStrip,
        Float32List.fromList(<double>[
          20.0,
          20.0,
          220.0,
          10.0,
          110.0,
          220.0,
          220.0,
          320.0,
          20.0,
          310.0,
          200.0,
          420.0
        ]));
    await testVertices('draw_vertices_hairline_triangle_strip', vertices,
        BlendMode.srcOver, Paint()..color = const Color.fromARGB(255, 0, 128, 0));
  });

  test('Should draw triangles with colors.', () async {
    final Int32List colors = Int32List.fromList(<int>[
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF,
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF
    ]);
    final Vertices vertices = Vertices.raw(
        VertexMode.triangles,
        Float32List.fromList(<double>[
          150.0,
          150.0,
          20.0,
          10.0,
          80.0,
          20.0,
          220.0,
          15.0,
          280.0,
          30.0,
          300.0,
          420.0
        ]),
        colors: colors);

    await testVertices('draw_vertices_triangles', vertices, BlendMode.srcOver,
        Paint()..color = const Color.fromARGB(255, 0, 128, 0));
  },
  // TODO(yjbanov): https://github.com/flutter/flutter/issues/86623
  skip: isFirefox);

  test('Should draw triangles with colors and indices.', () async {
    final Int32List colors = Int32List.fromList(
        <int>[0xFFFF0000, 0xFF00FF00, 0xFF0000FF, 0xFFFF0000, 0xFF0000FF]);
    final Uint16List indices = Uint16List.fromList(<int>[0, 1, 2, 3, 4, 0]);

    final RecordingCanvas rc =
        RecordingCanvas(const Rect.fromLTRB(0, 0, 500, 500));

    final Vertices vertices = Vertices.raw(
        VertexMode.triangles,
        Float32List.fromList(<double>[
          210.0,
          150.0,
          30.0,
          110.0,
          80.0,
          30.0,
          220.0,
          15.0,
          280.0,
          30.0,
        ]),
        colors: colors,
        indices: indices);

    rc.drawVertices(
        vertices as SurfaceVertices, BlendMode.srcOver, SurfacePaint());

    await canvasScreenshot(rc, 'draw_vertices_triangles_indexed', canvasRect: screenRect);
  },
  // TODO(yjbanov): https://github.com/flutter/flutter/issues/86623
  skip: isFirefox);

  test('Should draw triangleFan with colors.', () async {
    final Int32List colors = Int32List.fromList(<int>[
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF,
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF
    ]);
    final Vertices vertices = Vertices.raw(
        VertexMode.triangleFan,
        Float32List.fromList(<double>[
          150.0,
          150.0,
          20.0,
          10.0,
          80.0,
          20.0,
          220.0,
          15.0,
          280.0,
          30.0,
          300.0,
          420.0
        ]),
        colors: colors);

    await testVertices('draw_vertices_triangle_fan', vertices,
        BlendMode.srcOver, Paint()..color = const Color.fromARGB(255, 0, 128, 0));
  },
  // TODO(yjbanov): https://github.com/flutter/flutter/issues/86623
  skip: isFirefox);

  test('Should draw triangleStrip with colors.', () async {
    final Int32List colors = Int32List.fromList(<int>[
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF,
      0xFFFF0000,
      0xFF00FF00,
      0xFF0000FF
    ]);
    final Vertices vertices = Vertices.raw(
        VertexMode.triangleStrip,
        Float32List.fromList(<double>[
          20.0,
          20.0,
          220.0,
          10.0,
          110.0,
          220.0,
          220.0,
          320.0,
          20.0,
          310.0,
          200.0,
          420.0
        ]),
        colors: colors);
    await testVertices('draw_vertices_triangle_strip', vertices,
        BlendMode.srcOver, Paint()..color = const Color.fromARGB(255, 0, 128, 0));
  },
  // TODO(yjbanov): https://github.com/flutter/flutter/issues/86623
  skip: isFirefox);

  Future<void> testTexture(TileMode tileMode, String filename) async {
    final Uint16List indices = Uint16List.fromList(<int>[0, 1, 2, 3, 4, 0]);

    final RecordingCanvas rc =
        RecordingCanvas(const Rect.fromLTRB(0, 0, 500, 500));

    final Vertices vertices = Vertices.raw(
        VertexMode.triangles,
        Float32List.fromList(<double>[
          210.0,
          150.0,
          0.0,
          0.0,
          80.0,
          30.0,
          220.0,
          15.0,
          280.0,
          30.0,
        ]),
        indices: indices);

    final Float32List matrix4 = Matrix4.identity().storage;

    final HtmlImage img = await createTestImage();
    final SurfacePaint paint = SurfacePaint();

    final EngineImageShader imgShader = EngineImageShader(img, tileMode, tileMode,
        Float64List.fromList(matrix4), FilterQuality.high);

    paint.shader = imgShader;

    rc.drawVertices(vertices as SurfaceVertices, BlendMode.srcOver, paint);
    await canvasScreenshot(rc, filename, canvasRect: screenRect);

    expect(imgShader.debugDisposed, false);
    imgShader.dispose();
    expect(imgShader.debugDisposed, true);
  }

  test('Should draw triangle with texture and indices', () async {
    await testTexture(TileMode.clamp, 'draw_vertices_texture');
  },
  // TODO(yjbanov): https://github.com/flutter/flutter/issues/86623
  skip: isFirefox);

  test('Should draw triangle with texture and indices', () async {
    await testTexture(TileMode.mirror, 'draw_vertices_texture_mirror');
  },
  // TODO(yjbanov): https://github.com/flutter/flutter/issues/86623
  skip: isFirefox);

  test('Should draw triangle with texture and indices', () async {
    await testTexture(TileMode.repeated, 'draw_vertices_texture_repeated');
  },
  // TODO(yjbanov): https://github.com/flutter/flutter/issues/86623
  skip: isFirefox);
}

Future<HtmlImage> createTestImage({int width = 50, int height = 40}) {
  final DomCanvasElement canvas =
      createDomCanvasElement(width: width, height: height);
  final DomCanvasRenderingContext2D ctx = canvas.context2D;
  ctx.fillStyle = '#E04040';
  ctx.fillRect(0, 0, width / 3, height);
  ctx.fill();
  ctx.fillStyle = '#40E080';
  ctx.fillRect(width / 3, 0, width / 3, height);
  ctx.fill();
  ctx.fillStyle = '#2040E0';
  ctx.fillRect(2 * width / 3, 0, width / 3, height);
  ctx.fill();
  final DomHTMLImageElement imageElement = createDomHTMLImageElement();
  final Completer<HtmlImage> completer = Completer<HtmlImage>();
  imageElement.addEventListener('load', allowInterop((DomEvent event) {
    completer.complete(HtmlImage(imageElement, width, height));
  }));
  imageElement.src = js_util.callMethod<String>(canvas, 'toDataURL', <dynamic>[]);
  return completer.future;
}