/*
 * Copyright 2025 Rive
 */

#include "gm.hpp"
#include "gmutils.hpp"
#include "rive/renderer.hpp"

using namespace rivegm;
using namespace rive;

// Check that clockwise paths render & blend correctly with winding numbers much
// larger than 1.
// It's especially important to check that clockwise render modes with
// transparency don't corrupt the paint after coverage is fully saturated.
static void render_overdraw_paths(
    RenderPaintStyle style,
    ColorInt color0,
    BlendMode mode0,
    ColorInt color1,
    BlendMode mode1,
    ColorInt color2,
    BlendMode mode2,
    Renderer* renderer)
{
  {
    // Create a region of solid dstColor to make sure we also catch the
    // blend modes on a==1.
    Paint solidWhite;
    solidWhite->color(0xffffffff);
    Path path;
    path->fillRule(FillRule::evenOdd);
    path->moveTo(10, 70);
    path->lineTo(130, 70);
    path->lineTo(130, 190);
    path->lineTo(10, 190);
    renderer->drawPath(path.get(), solidWhite.get());
  }

  PathBuilder pathBuilder;
  pathBuilder.fillRule(FillRule::clockwise);
  for (float r : {10, 50, 40, 80, 90, 70, 60, 20, 50, 30})
  {
    pathBuilder.addCircle(100, 100, r);
  }
  auto path = pathBuilder.detach();

  Paint paint;
  paint->style(style);
  paint->thickness(20);
  paint->color(color0);
  paint->blendMode(mode0);
  renderer->translate(-30, -30);
  renderer->drawPath(path.get(), paint.get());

  paint->color(color1);
  paint->blendMode(mode1);
  renderer->translate(60, 0);
  renderer->drawPath(path.get(), paint.get());

  paint->color(color2);
  paint->blendMode(mode2);
  renderer->translate(0, 60);
  renderer->drawPath(path.get(), paint.get());
}

DEF_SIMPLE_GM(overfill_opaque, 200, 200, renderer)
{
  render_overdraw_paths(
      RenderPaintStyle::fill,
      0xff00ff00,
      BlendMode::srcOver,
      0xff0000ff,
      BlendMode::srcOver,
      0xffff0000,
      BlendMode::srcOver,
      renderer);
}

DEF_SIMPLE_GM(overfill_transparent, 200, 200, renderer)
{
  render_overdraw_paths(
      RenderPaintStyle::fill,
      0x6000ff00,
      BlendMode::srcOver,
      0x600000ff,
      BlendMode::srcOver,
      0x60ff0000,
      BlendMode::srcOver,
      renderer);
}

DEF_SIMPLE_GM_WITH_CLEAR_COLOR(
    overfill_blendmodes,
    0x20202020,
    200,
    200,
    renderer)
{
  render_overdraw_paths(
      RenderPaintStyle::fill,
      // Make one opaque so we catch early out
      // optimizations.
      0xff10f040,
      BlendMode::exclusion,
      0x70ee905a,
      BlendMode::saturation,
      0xb0905aee,
      BlendMode::luminosity,
      renderer);
}

DEF_SIMPLE_GM(overstroke_opaque, 200, 200, renderer)
{
  render_overdraw_paths(
      RenderPaintStyle::stroke,
      0xff00ff00,
      BlendMode::srcOver,
      0xff0000ff,
      BlendMode::srcOver,
      0xffff0000,
      BlendMode::srcOver,
      renderer);
}

DEF_SIMPLE_GM(overstroke_transparent, 200, 200, renderer)
{
  render_overdraw_paths(
      RenderPaintStyle::stroke,
      0x6000ff00,
      BlendMode::srcOver,
      0x600000ff,
      BlendMode::srcOver,
      0x60ff0000,
      BlendMode::srcOver,
      renderer);
}

DEF_SIMPLE_GM_WITH_CLEAR_COLOR(
    overstroke_blendmodes,
    0x20202020,
    200,
    200,
    renderer)
{
  render_overdraw_paths(
      RenderPaintStyle::stroke,
      // Make one opaque so we catch early out
      // optimizations.
      0xff10f040,
      BlendMode::exclusion,
      0x70ee905a,
      BlendMode::saturation,
      0xb0905aee,
      BlendMode::luminosity,
      renderer);
}