// 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.

#include <iostream>

#include "flutter/shell/platform/embedder/test_utils/proc_table_replacement.h"
#include "flutter/shell/platform/windows/flutter_windows_engine.h"
#include "flutter/shell/platform/windows/flutter_windows_texture_registrar.h"
#include "flutter/shell/platform/windows/testing/engine_modifier.h"
#include "gtest/gtest.h"

namespace flutter {
namespace testing {

namespace {
// Returns an engine instance configured with dummy project path values.
std::unique_ptr<FlutterWindowsEngine> GetTestEngine() {
  FlutterDesktopEngineProperties properties = {};
  properties.assets_path = L"C:\\foo\\flutter_assets";
  properties.icu_data_path = L"C:\\foo\\icudtl.dat";
  properties.aot_library_path = L"C:\\foo\\aot.so";
  FlutterProjectBundle project(properties);
  return std::make_unique<FlutterWindowsEngine>(project);
}
}  // namespace

TEST(FlutterWindowsTextureRegistrarTest, CreateDestroy) {
  std::unique_ptr<FlutterWindowsEngine> engine = GetTestEngine();

  FlutterWindowsTextureRegistrar registrar(engine.get());

  EXPECT_TRUE(true);
}

TEST(FlutterWindowsTextureRegistrarTest, RegisterUnregisterTexture) {
  std::unique_ptr<FlutterWindowsEngine> engine = GetTestEngine();
  EngineModifier modifier(engine.get());

  FlutterWindowsTextureRegistrar registrar(engine.get());

  FlutterDesktopTextureInfo texture_info = {};
  texture_info.type = kFlutterDesktopPixelBufferTexture;
  texture_info.pixel_buffer_config.callback =
      [](size_t width, size_t height,
         void* user_data) -> const FlutterDesktopPixelBuffer* {
    return nullptr;
  };

  int64_t registered_texture_id = 0;
  bool register_called = false;
  modifier.embedder_api().RegisterExternalTexture = MOCK_ENGINE_PROC(
      RegisterExternalTexture, ([&register_called, &registered_texture_id](
                                    auto engine, auto texture_id) {
        register_called = true;
        registered_texture_id = texture_id;
        return kSuccess;
      }));

  bool unregister_called = false;
  modifier.embedder_api().UnregisterExternalTexture = MOCK_ENGINE_PROC(
      UnregisterExternalTexture, ([&unregister_called, &registered_texture_id](
                                      auto engine, auto texture_id) {
        unregister_called = true;
        EXPECT_EQ(registered_texture_id, texture_id);
        return kSuccess;
      }));

  bool mark_frame_available_called = false;
  modifier.embedder_api().MarkExternalTextureFrameAvailable =
      MOCK_ENGINE_PROC(MarkExternalTextureFrameAvailable,
                       ([&mark_frame_available_called, &registered_texture_id](
                            auto engine, auto texture_id) {
                         mark_frame_available_called = true;
                         EXPECT_EQ(registered_texture_id, texture_id);
                         return kSuccess;
                       }));

  auto texture_id = registrar.RegisterTexture(&texture_info);
  EXPECT_TRUE(register_called);
  EXPECT_NE(texture_id, -1);
  EXPECT_EQ(texture_id, registered_texture_id);

  EXPECT_TRUE(registrar.MarkTextureFrameAvailable(texture_id));
  EXPECT_TRUE(mark_frame_available_called);

  EXPECT_TRUE(registrar.UnregisterTexture(texture_id));
  EXPECT_TRUE(unregister_called);
}

TEST(FlutterWindowsTextureRegistrarTest, RegisterUnknownTextureType) {
  std::unique_ptr<FlutterWindowsEngine> engine = GetTestEngine();
  EngineModifier modifier(engine.get());

  FlutterWindowsTextureRegistrar registrar(engine.get());

  FlutterDesktopTextureInfo texture_info = {};
  texture_info.type = static_cast<FlutterDesktopTextureType>(1234);

  auto texture_id = registrar.RegisterTexture(&texture_info);

  EXPECT_EQ(texture_id, -1);
}

TEST(FlutterWindowsTextureRegistrarTest, PopulateInvalidTexture) {
  std::unique_ptr<FlutterWindowsEngine> engine = GetTestEngine();

  FlutterWindowsTextureRegistrar registrar(engine.get());

  auto result = registrar.PopulateTexture(1, 640, 480, nullptr);
  EXPECT_FALSE(result);
}

// TODO Add additional tests for PopulateTexture() once we've mocked gl*
// functions used by ExternalTextureGL

}  // namespace testing
}  // namespace flutter