// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "extensions/browser/image_loader.h"

#include <stddef.h>

#include <memory>
#include <set>
#include <string>
#include <utility>
#include <vector>

#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/json/json_file_value_serializer.h"
#include "base/path_service.h"
#include "base/run_loop.h"
#include "base/strings/string_util.h"
#include "content/public/test/test_browser_context.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/browser/extensions_browser_client.h"
#include "extensions/browser/extensions_test.h"
#include "extensions/browser/unloaded_extension_reason.h"
#include "extensions/common/constants.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_paths.h"
#include "extensions/common/extension_resource.h"
#include "extensions/common/icons/extension_icon_set.h"
#include "extensions/common/manifest.h"
#include "extensions/common/manifest_handlers/icons_handler.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/image/image_family.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_rep.h"

using extensions::mojom::ManifestLocation;

namespace extensions {

class ImageLoaderTest : public ExtensionsTest {
 public:
  ImageLoaderTest() : image_loaded_count_(0), quit_in_image_loaded_(false) {}

  void OnImageLoaded(const gfx::Image& image) {
    image_loaded_count_++;
    if (quit_in_image_loaded_) {
      loop_.QuitWhenIdle();
    }
    image_ = image;
  }

  void OnImageFamilyLoaded(gfx::ImageFamily image_family) {
    image_loaded_count_++;
    if (quit_in_image_loaded_) {
      loop_.QuitWhenIdle();
    }
    image_family_ = std::move(image_family);
  }

  void WaitForImageLoad() {
    quit_in_image_loaded_ = true;
    loop_.Run();
    quit_in_image_loaded_ = false;
  }

  int image_loaded_count() {
    int result = image_loaded_count_;
    image_loaded_count_ = 0;
    return result;
  }

  scoped_refptr<Extension> CreateExtension(const char* dir_name,
                                           ManifestLocation location) {
    // Create and load an extension.
    base::FilePath extension_dir;
    if (!base::PathService::Get(DIR_TEST_DATA, &extension_dir)) {
      EXPECT_FALSE(true);
      return nullptr;
    }
    extension_dir = extension_dir.AppendASCII(dir_name);
    int error_code = 0;
    std::string error;
    JSONFileValueDeserializer deserializer(
        extension_dir.AppendASCII("manifest.json"));
    std::unique_ptr<base::Value> valid_value =
        deserializer.Deserialize(&error_code, &error);
    EXPECT_EQ(0, error_code) << error;
    if (error_code != 0) {
      return nullptr;
    }

    EXPECT_TRUE(valid_value.get());
    EXPECT_TRUE(valid_value->is_dict());
    if (!valid_value || !valid_value->is_dict()) {
      return nullptr;
    }

    std::u16string utf16_error;
    return Extension::Create(extension_dir, location, valid_value->GetDict(),
                             Extension::NO_FLAGS, &utf16_error);
  }

  gfx::Image image_;
  gfx::ImageFamily image_family_;

 private:
  int image_loaded_count_;
  bool quit_in_image_loaded_;
  base::RunLoop loop_;
};

// Tests loading an image works correctly.
TEST_F(ImageLoaderTest, LoadImage) {
  scoped_refptr<Extension> extension(
      CreateExtension("image_loader", ManifestLocation::kInvalidLocation));
  ASSERT_TRUE(extension.get() != nullptr);

  ExtensionResource image_resource = IconsInfo::GetIconResource(
      extension.get(), extension_misc::EXTENSION_ICON_SMALLISH,
      ExtensionIconSet::Match::kExactly);
  gfx::Size max_size(extension_misc::EXTENSION_ICON_SMALLISH,
                     extension_misc::EXTENSION_ICON_SMALLISH);
  ImageLoader loader;
  loader.LoadImageAsync(
      extension.get(), image_resource, max_size,
      base::BindOnce(&ImageLoaderTest::OnImageLoaded, base::Unretained(this)));

  // The image isn't cached, so we should not have received notification.
  EXPECT_EQ(0, image_loaded_count());

  WaitForImageLoad();

  // We should have gotten the image.
  EXPECT_FALSE(image_.IsEmpty());
  EXPECT_EQ(1, image_loaded_count());

  // Check that the image was loaded.
  EXPECT_EQ(extension_misc::EXTENSION_ICON_SMALLISH,
            image_.ToSkBitmap()->width());
}

// Tests deleting an extension while waiting for the image to load doesn't cause
// problems.
TEST_F(ImageLoaderTest, DeleteExtensionWhileWaitingForCache) {
  scoped_refptr<Extension> extension(
      CreateExtension("image_loader", ManifestLocation::kInvalidLocation));
  ASSERT_TRUE(extension.get() != nullptr);

  ExtensionResource image_resource = IconsInfo::GetIconResource(
      extension.get(), extension_misc::EXTENSION_ICON_SMALLISH,
      ExtensionIconSet::Match::kExactly);
  gfx::Size max_size(extension_misc::EXTENSION_ICON_SMALLISH,
                     extension_misc::EXTENSION_ICON_SMALLISH);
  ImageLoader loader;
  std::set<int> sizes;
  sizes.insert(extension_misc::EXTENSION_ICON_SMALLISH);
  loader.LoadImageAsync(
      extension.get(), image_resource, max_size,
      base::BindOnce(&ImageLoaderTest::OnImageLoaded, base::Unretained(this)));

  // The image isn't cached, so we should not have received notification.
  EXPECT_EQ(0, image_loaded_count());

  // Send out notification the extension was uninstalled.
  ExtensionRegistry::Get(browser_context())
      ->TriggerOnUnloaded(extension.get(), UnloadedExtensionReason::UNINSTALL);

  // Chuck the extension, that way if anyone tries to access it we should crash
  // or get valgrind errors.
  extension = nullptr;

  WaitForImageLoad();

  // Even though we deleted the extension, we should still get the image.
  // We should still have gotten the image.
  EXPECT_EQ(1, image_loaded_count());

  // Check that the image was loaded.
  EXPECT_EQ(extension_misc::EXTENSION_ICON_SMALLISH,
            image_.ToSkBitmap()->width());
}

// Tests loading multiple dimensions of the same image.
TEST_F(ImageLoaderTest, MultipleImages) {
  scoped_refptr<Extension> extension(
      CreateExtension("image_loader", ManifestLocation::kInvalidLocation));
  ASSERT_TRUE(extension.get() != nullptr);

  std::vector<ImageLoader::ImageRepresentation> info_list;
  static constexpr int sizes[] = {
      extension_misc::EXTENSION_ICON_BITTY,
      extension_misc::EXTENSION_ICON_SMALLISH,
  };
  for (const auto& entry : sizes) {
    ExtensionResource resource = IconsInfo::GetIconResource(
        extension.get(), entry, ExtensionIconSet::Match::kExactly);
    info_list.push_back(ImageLoader::ImageRepresentation(
        resource, ImageLoader::ImageRepresentation::RESIZE_WHEN_LARGER,
        gfx::Size(entry, entry), 1.f));
  }

  ImageLoader loader;
  loader.LoadImagesAsync(
      extension.get(), info_list,
      base::BindOnce(&ImageLoaderTest::OnImageLoaded, base::Unretained(this)));

  // The image isn't cached, so we should not have received notification.
  EXPECT_EQ(0, image_loaded_count());

  WaitForImageLoad();

  // We should have gotten the image.
  EXPECT_EQ(1, image_loaded_count());

  // Check that all images were loaded.
  std::vector<gfx::ImageSkiaRep> image_reps =
      image_.ToImageSkia()->image_reps();
  ASSERT_EQ(2u, image_reps.size());

  const gfx::ImageSkiaRep* img_rep1 = &image_reps[0];
  const gfx::ImageSkiaRep* img_rep2 = &image_reps[1];
  EXPECT_EQ(extension_misc::EXTENSION_ICON_BITTY,
            img_rep1->pixel_width());
  EXPECT_EQ(extension_misc::EXTENSION_ICON_SMALLISH,
            img_rep2->pixel_width());
}

// Tests loading multiple dimensions of the same image into an image family.
TEST_F(ImageLoaderTest, LoadImageFamily) {
  scoped_refptr<Extension> extension(
      CreateExtension("image_loader", ManifestLocation::kInvalidLocation));
  ASSERT_TRUE(extension.get() != nullptr);

  std::vector<ImageLoader::ImageRepresentation> info_list;
  static constexpr int sizes[] = {extension_misc::EXTENSION_ICON_BITTY,
                                  extension_misc::EXTENSION_ICON_SMALLISH};
  for (int size : sizes) {
    ExtensionResource resource = IconsInfo::GetIconResource(
        extension.get(), size, ExtensionIconSet::Match::kExactly);
    info_list.push_back(ImageLoader::ImageRepresentation(
        resource, ImageLoader::ImageRepresentation::NEVER_RESIZE,
        gfx::Size(size, size), 1.f));
  }

  // Add a second icon of 200P which should get grouped with the smaller icon's
  // ImageSkia.
  ExtensionResource resource = IconsInfo::GetIconResource(
      extension.get(), extension_misc::EXTENSION_ICON_SMALLISH,
      ExtensionIconSet::Match::kExactly);
  info_list.push_back(ImageLoader::ImageRepresentation(
      resource, ImageLoader::ImageRepresentation::NEVER_RESIZE,
      gfx::Size(extension_misc::EXTENSION_ICON_BITTY,
                extension_misc::EXTENSION_ICON_BITTY),
      2.f));

  ImageLoader loader;
  loader.LoadImageFamilyAsync(
      extension.get(), info_list,
      base::BindOnce(&ImageLoaderTest::OnImageFamilyLoaded,
                     base::Unretained(this)));

  // The image isn't cached, so we should not have received notification.
  EXPECT_EQ(0, image_loaded_count());

  WaitForImageLoad();

  // We should have gotten the image.
  EXPECT_EQ(1, image_loaded_count());

  // Check that all images were loaded.
  for (int size : sizes) {
    const gfx::Image* image = image_family_.GetBest(size, size);
    EXPECT_EQ(size, image->Width());
  }

  // Check the smaller image has 2 representations of different scale factors.
  std::vector<gfx::ImageSkiaRep> image_reps =
      image_family_.GetBest(extension_misc::EXTENSION_ICON_BITTY,
                            extension_misc::EXTENSION_ICON_BITTY)
          ->ToImageSkia()
          ->image_reps();

  ASSERT_EQ(2u, image_reps.size());

  const gfx::ImageSkiaRep* img_rep1 = &image_reps[0];
  const gfx::ImageSkiaRep* img_rep2 = &image_reps[1];
  EXPECT_EQ(extension_misc::EXTENSION_ICON_BITTY, img_rep1->pixel_width());
  EXPECT_EQ(1.0f, img_rep1->scale());
  EXPECT_EQ(extension_misc::EXTENSION_ICON_SMALLISH, img_rep2->pixel_width());
  EXPECT_EQ(2.0f, img_rep2->scale());
}

}  // namespace extensions