/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "android-base/file.h"
#include "androidfw/ApkAssets.h"
#include "androidfw/AssetManager2.h"
#include "androidfw/ResourceTypes.h"

#include "utils/String16.h"
#include "utils/String8.h"

#include "TestHelpers.h"
#include "data/overlay/R.h"
#include "data/overlayable/R.h"
#include "data/system/R.h"

using ::testing::NotNull;

namespace overlay = com::android::overlay;
namespace overlayable = com::android::overlayable;

namespace android {

namespace {

class IdmapTest : public ::testing::Test {
 protected:
  void SetUp() override {
    // Move to the test data directory so the idmap can locate the overlay APK.
    original_path = base::GetExecutableDirectory();
    chdir(GetTestDataPath().c_str());

    system_assets_ = ApkAssets::Load("system/system.apk");
    ASSERT_NE(nullptr, system_assets_);

    overlay_assets_ = ApkAssets::LoadOverlay("overlay/overlay.idmap");
    ASSERT_NE(nullptr, overlay_assets_);

    overlayable_assets_ = ApkAssets::Load("overlayable/overlayable.apk");
    ASSERT_NE(nullptr, overlayable_assets_);
  }

  void TearDown() override {
    chdir(original_path.c_str());
  }

 protected:
  std::string original_path;
  std::unique_ptr<const ApkAssets> system_assets_;
  std::unique_ptr<const ApkAssets> overlay_assets_;
  std::unique_ptr<const ApkAssets> overlayable_assets_;
};

std::string GetStringFromApkAssets(const AssetManager2& asset_manager,
                                   const AssetManager2::SelectedValue& value) {
  auto assets = asset_manager.GetApkAssets();
  const ResStringPool* string_pool = assets[value.cookie]->GetLoadedArsc()->GetStringPool();
  return GetStringFromPool(string_pool, value.data);
}

}

TEST_F(IdmapTest, OverlayOverridesResourceValue) {
  AssetManager2 asset_manager;
  asset_manager.SetApkAssets({system_assets_.get(), overlayable_assets_.get(),
                              overlay_assets_.get()});

  auto value = asset_manager.GetResource(overlayable::R::string::overlayable5);
  ASSERT_TRUE(value.has_value());
  ASSERT_EQ(value->cookie, 2U);
  ASSERT_EQ(value->type, Res_value::TYPE_STRING);
  ASSERT_EQ("Overlay One", GetStringFromApkAssets(asset_manager, *value));
}

TEST_F(IdmapTest, OverlayOverridesResourceValueUsingDifferentPackage) {
  AssetManager2 asset_manager;
  asset_manager.SetApkAssets({system_assets_.get(), overlayable_assets_.get(),
                              overlay_assets_.get()});

  auto value = asset_manager.GetResource(overlayable::R::string::overlayable10);
  ASSERT_TRUE(value.has_value());
  ASSERT_EQ(value->cookie, 0U);
  ASSERT_EQ(value->type, Res_value::TYPE_STRING);
  ASSERT_EQ("yes", GetStringFromApkAssets(asset_manager, *value));
}

TEST_F(IdmapTest, OverlayOverridesResourceValueUsingInternalResource) {
  AssetManager2 asset_manager;
  asset_manager.SetApkAssets({system_assets_.get(), overlayable_assets_.get(),
                              overlay_assets_.get()});

  auto value = asset_manager.GetResource(overlayable::R::string::overlayable8);
  ASSERT_TRUE(value.has_value());
  ASSERT_EQ(value->cookie, 2U);
  ASSERT_EQ(value->type, Res_value::TYPE_REFERENCE);
  ASSERT_EQ(value->data, (overlay::R::string::internal & 0x00ffffffU) | (0x02U << 24));
}

TEST_F(IdmapTest, OverlayOverridesResourceValueUsingInlineInteger) {
  AssetManager2 asset_manager;
  asset_manager.SetApkAssets({system_assets_.get(), overlayable_assets_.get(),
                              overlay_assets_.get()});

  auto value = asset_manager.GetResource(overlayable::R::integer::config_integer);
  ASSERT_TRUE(value.has_value());
  ASSERT_EQ(value->cookie, 2U);
  ASSERT_EQ(value->type, Res_value::TYPE_INT_DEC);
  ASSERT_EQ(value->data, 42);
}

TEST_F(IdmapTest, OverlayOverridesResourceValueUsingInlineString) {
  AssetManager2 asset_manager;
  asset_manager.SetApkAssets({system_assets_.get(), overlayable_assets_.get(),
                              overlay_assets_.get()});

  auto value = asset_manager.GetResource(overlayable::R::string::overlayable11);
  ASSERT_TRUE(value.has_value());
  ASSERT_EQ(value->cookie, 2U);
  ASSERT_EQ(value->type, Res_value::TYPE_STRING);
  ASSERT_EQ("Hardcoded string", GetStringFromApkAssets(asset_manager, *value));
}

TEST_F(IdmapTest, OverlayOverridesResourceValueUsingOverlayingResource) {
  AssetManager2 asset_manager;
  asset_manager.SetApkAssets({system_assets_.get(), overlayable_assets_.get(),
                              overlay_assets_.get()});

  auto value = asset_manager.GetResource(overlayable::R::string::overlayable9);
  ASSERT_TRUE(value.has_value());
  ASSERT_EQ(value->cookie, 2U);
  ASSERT_EQ(value->type, Res_value::TYPE_REFERENCE);
  ASSERT_EQ(value->data, overlayable::R::string::overlayable7);
}

TEST_F(IdmapTest, OverlayOverridesXmlParser) {
  AssetManager2 asset_manager;
  asset_manager.SetApkAssets({system_assets_.get(), overlayable_assets_.get(),
                              overlay_assets_.get()});

  auto value = asset_manager.GetResource(overlayable::R::layout::hello_view);
  ASSERT_TRUE(value.has_value());
  ASSERT_EQ(value->cookie, 2U);
  ASSERT_EQ(value->type, Res_value::TYPE_STRING);
  ASSERT_EQ("res/layout/hello_view.xml", GetStringFromApkAssets(asset_manager, *value));

  auto asset = asset_manager.OpenNonAsset("res/layout/hello_view.xml", value->cookie,
                                          Asset::ACCESS_RANDOM);
  auto dynamic_ref_table = asset_manager.GetDynamicRefTableForCookie(value->cookie);
  auto xml_tree = util::make_unique<ResXMLTree>(std::move(dynamic_ref_table));
  status_t err = xml_tree->setTo(asset->getBuffer(true), asset->getLength(), false);
  ASSERT_EQ(err, NO_ERROR);

  while (xml_tree->next() != ResXMLParser::START_TAG) { }

  // The resource id of @id/hello_view should be rewritten to the resource id/hello_view within the
  // target.
  ASSERT_EQ(xml_tree->getAttributeNameResID(0), 0x010100d0 /* android:attr/id */);
  ASSERT_EQ(xml_tree->getAttributeDataType(0), Res_value::TYPE_REFERENCE);
  ASSERT_EQ(xml_tree->getAttributeData(0), overlayable::R::id::hello_view);

  // The resource id of @android:string/yes should not be rewritten even though it overlays
  // string/overlayable10 in the target.
  ASSERT_EQ(xml_tree->getAttributeNameResID(1), 0x0101014f /* android:attr/text */);
  ASSERT_EQ(xml_tree->getAttributeDataType(1), Res_value::TYPE_REFERENCE);
  ASSERT_EQ(xml_tree->getAttributeData(1), 0x01040013 /* android:string/yes */);

  // The resource id of the attribute within the overlay should be rewritten to the resource id of
  // the attribute in the target.
  ASSERT_EQ(xml_tree->getAttributeNameResID(2), overlayable::R::attr::max_lines);
  ASSERT_EQ(xml_tree->getAttributeDataType(2), Res_value::TYPE_INT_DEC);
  ASSERT_EQ(xml_tree->getAttributeData(2), 4);
}

TEST_F(IdmapTest, OverlaidResourceHasSameName) {
  AssetManager2 asset_manager;
  asset_manager.SetApkAssets({system_assets_.get(), overlayable_assets_.get(),
                              overlay_assets_.get()});

  auto name = asset_manager.GetResourceName(overlayable::R::string::overlayable9);
  ASSERT_TRUE(name.has_value());
  ASSERT_EQ("com.android.overlayable", std::string(name->package));
  ASSERT_EQ(std::u16string(u"string"), std::u16string(name->type16));
  ASSERT_EQ("overlayable9", std::string(name->entry));
}

TEST_F(IdmapTest, OverlayLoaderInterop) {
  auto asset = AssetsProvider::CreateAssetFromFile(GetTestDataPath() + "/loader/resources.arsc");
  ASSERT_THAT(asset, NotNull());

  auto loader_assets = ApkAssets::LoadTable(std::move(asset), EmptyAssetsProvider::Create(),
      PROPERTY_LOADER);
  AssetManager2 asset_manager;
  asset_manager.SetApkAssets({overlayable_assets_.get(), loader_assets.get(),
                              overlay_assets_.get()});

  auto value = asset_manager.GetResource(overlayable::R::string::overlayable11);
  ASSERT_TRUE(value.has_value());
  ASSERT_EQ(1U, value->cookie);
  ASSERT_EQ(Res_value::TYPE_STRING, value->type);
  ASSERT_EQ("loader", GetStringFromApkAssets(asset_manager, *value));
}

TEST_F(IdmapTest, OverlayAssetsIsUpToDate) {
  std::string idmap_contents;
  ASSERT_TRUE(base::ReadFileToString("overlay/overlay.idmap", &idmap_contents));

  TemporaryFile temp_file;
  ASSERT_TRUE(base::WriteStringToFile(idmap_contents, temp_file.path));

  auto apk_assets = ApkAssets::LoadOverlay(temp_file.path);
  ASSERT_NE(nullptr, apk_assets);
  ASSERT_TRUE(apk_assets->IsUpToDate());

  unlink(temp_file.path);
  ASSERT_FALSE(apk_assets->IsUpToDate());
  sleep(2);

  base::WriteStringToFile("hello", temp_file.path);
  sleep(2);

  ASSERT_FALSE(apk_assets->IsUpToDate());
}

}  // namespace