/* vim:set ts=2 sw=2 sts=2 et: */
/* Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

#include "gfxPrefs.h"
#include "gfxUtils.h"
#include "gtest/gtest.h"
#include "TestLayers.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/RefPtr.h"
#include "mozilla/layers/BasicCompositor.h"  // for BasicCompositor
#include "mozilla/layers/Compositor.h"  // for Compositor
#include "mozilla/layers/CompositorOGL.h"  // for CompositorOGL
#include "mozilla/layers/CompositorTypes.h"
#include "mozilla/layers/LayerManagerComposite.h"
#include "MockWidget.h"
#include "nsBaseWidget.h"
#include <vector>

const int gCompWidth = 256;
const int gCompHeight = 256;

using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::gl;

struct LayerManagerData {
  RefPtr<MockWidget> mWidget;
  RefPtr<Compositor> mCompositor;
  RefPtr<widget::CompositorWidget> mCompositorWidget;
  RefPtr<LayerManagerComposite> mLayerManager;

  LayerManagerData(Compositor* compositor,
                   MockWidget* widget,
                   widget::CompositorWidget* aWidget,
                   LayerManagerComposite* layerManager)
    : mWidget(widget)
    , mCompositor(compositor)
    , mCompositorWidget(aWidget)
    , mLayerManager(layerManager)
  {}
};

static already_AddRefed<Compositor> CreateTestCompositor(LayersBackend backend, widget::CompositorWidget* widget)
{
  gfxPlatform::GetPlatform();

  RefPtr<Compositor> compositor;

  if (backend == LayersBackend::LAYERS_OPENGL) {
    compositor = new CompositorOGL(nullptr,
                                   widget,
                                   gCompWidth,
                                   gCompHeight,
                                   true);
    compositor->SetDestinationSurfaceSize(IntSize(gCompWidth, gCompHeight));
  } else if (backend == LayersBackend::LAYERS_BASIC) {
    compositor = new BasicCompositor(nullptr, widget);
#ifdef XP_WIN
  } else if (backend == LayersBackend::LAYERS_D3D11) {
    //compositor = new CompositorD3D11();
    MOZ_CRASH(); // No support yet
#endif
  }
  nsCString failureReason;
  if (!compositor || !compositor->Initialize(&failureReason)) {
    printf_stderr("Failed to construct layer manager for the requested backend\n");
    abort();
  }

  return compositor.forget();
}

/**
 * Get a list of layers managers for the platform to run the test on.
 */
static std::vector<LayerManagerData> GetLayerManagers(std::vector<LayersBackend> aBackends)
{
  std::vector<LayerManagerData> managers;

  for (size_t i = 0; i < aBackends.size(); i++) {
    auto backend = aBackends[i];

    RefPtr<MockWidget> widget = new MockWidget(gCompWidth, gCompHeight);
    CompositorOptions options;
    RefPtr<widget::CompositorWidget> proxy = new widget::InProcessCompositorWidget(options, widget);
    RefPtr<Compositor> compositor = CreateTestCompositor(backend, proxy);

    RefPtr<LayerManagerComposite> layerManager = new LayerManagerComposite(compositor);

    managers.push_back(LayerManagerData(compositor, widget, proxy, layerManager));
  }

  return managers;
}

/**
 * This will return the default list of backends that
 * units test should run against.
 */
static std::vector<LayersBackend> GetPlatformBackends()
{
  std::vector<LayersBackend> backends;

  // For now we only support Basic for gtest
  backends.push_back(LayersBackend::LAYERS_BASIC);

#ifdef XP_MACOSX
  backends.push_back(LayersBackend::LAYERS_OPENGL);
#endif

  // TODO Support OGL/D3D backends with unit test
  return backends;
}

static already_AddRefed<DrawTarget> CreateDT()
{
  return gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
    IntSize(gCompWidth, gCompHeight), SurfaceFormat::B8G8R8A8);
}

static bool CompositeAndCompare(RefPtr<LayerManagerComposite> layerManager, DrawTarget* refDT)
{
  RefPtr<DrawTarget> drawTarget = CreateDT();

  layerManager->BeginTransactionWithDrawTarget(drawTarget, IntRect(0, 0, gCompWidth, gCompHeight));
  layerManager->EndTransaction(TimeStamp::Now());

  RefPtr<SourceSurface> ss = drawTarget->Snapshot();
  RefPtr<DataSourceSurface> dss = ss->GetDataSurface();
  DataSourceSurface::ScopedMap dssMap(dss, DataSourceSurface::READ);
  uint8_t* bitmap = dssMap.GetData();

  RefPtr<SourceSurface> ssRef = refDT->Snapshot();
  RefPtr<DataSourceSurface> dssRef = ssRef->GetDataSurface();
  DataSourceSurface::ScopedMap dssRefMap(dssRef, DataSourceSurface::READ);
  uint8_t* bitmapRef = dssRefMap.GetData();

  for (int y = 0; y < gCompHeight; y++) {
    for (int x = 0; x < gCompWidth; x++) {
      for (size_t channel = 0; channel < 4; channel++) {
        uint8_t bit = bitmap[y * dssMap.GetStride() + x * 4 + channel];
        uint8_t bitRef = bitmapRef[y * dssRefMap.GetStride() + x * 4 + channel];
        if (bit != bitRef) {
          printf("Layer Tree:\n");
          layerManager->Dump();
          printf("Original:\n");
          gfxUtils::DumpAsDataURI(drawTarget);
          printf("\n\n");

          printf("Reference:\n");
          gfxUtils::DumpAsDataURI(refDT);
          printf("\n\n");

          return false;
        }
      }
    }
  }

  return true;
}

TEST(Gfx, CompositorConstruct)
{
  auto layerManagers = GetLayerManagers(GetPlatformBackends());
}

TEST(Gfx, CompositorSimpleTree)
{
  auto layerManagers = GetLayerManagers(GetPlatformBackends());
  for (size_t i = 0; i < layerManagers.size(); i++) {
    RefPtr<LayerManagerComposite> layerManager = layerManagers[i].mLayerManager;
    RefPtr<LayerManager> lmBase = layerManager.get();
    nsTArray<RefPtr<Layer>> layers;
    nsIntRegion layerVisibleRegion[] = {
      nsIntRegion(IntRect(0, 0, gCompWidth, gCompHeight)),
      nsIntRegion(IntRect(0, 0, gCompWidth, gCompHeight)),
      nsIntRegion(IntRect(0, 0, 100, 100)),
      nsIntRegion(IntRect(0, 50, 100, 100)),
    };
    RefPtr<Layer> root = CreateLayerTree("c(ooo)", layerVisibleRegion, nullptr, lmBase, layers);

    { // background
      ColorLayer* colorLayer = layers[1]->AsColorLayer();
      colorLayer->SetColor(Color(1.f, 0.f, 1.f, 1.f));
      colorLayer->SetBounds(colorLayer->GetVisibleRegion().ToUnknownRegion().GetBounds());
    }

    {
      ColorLayer* colorLayer = layers[2]->AsColorLayer();
      colorLayer->SetColor(Color(1.f, 0.f, 0.f, 1.f));
      colorLayer->SetBounds(colorLayer->GetVisibleRegion().ToUnknownRegion().GetBounds());
    }

    {
      ColorLayer* colorLayer = layers[3]->AsColorLayer();
      colorLayer->SetColor(Color(0.f, 0.f, 1.f, 1.f));
      colorLayer->SetBounds(colorLayer->GetVisibleRegion().ToUnknownRegion().GetBounds());
    }

    RefPtr<DrawTarget> refDT = CreateDT();
    refDT->FillRect(Rect(0, 0, gCompWidth, gCompHeight), ColorPattern(Color(1.f, 0.f, 1.f, 1.f)));
    refDT->FillRect(Rect(0, 0, 100, 100), ColorPattern(Color(1.f, 0.f, 0.f, 1.f)));
    refDT->FillRect(Rect(0, 50, 100, 100), ColorPattern(Color(0.f, 0.f, 1.f, 1.f)));
    EXPECT_TRUE(CompositeAndCompare(layerManager, refDT));
  }
}