// 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 "storage/browser/file_system/file_system_usage_cache.h"

#include <stdint.h>

#include <limits>

#include "base/files/scoped_temp_dir.h"
#include "base/test/task_environment.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace storage {

class FileSystemUsageCacheTest : public testing::Test,
                                 public ::testing::WithParamInterface<bool> {
 public:
  FileSystemUsageCacheTest() : usage_cache_(is_incognito()) {}

  FileSystemUsageCacheTest(const FileSystemUsageCacheTest&) = delete;
  FileSystemUsageCacheTest& operator=(const FileSystemUsageCacheTest&) = delete;

  void SetUp() override { ASSERT_TRUE(data_dir_.CreateUniqueTempDir()); }

  bool is_incognito() { return GetParam(); }

 protected:
  base::FilePath GetUsageFilePath() {
    return data_dir_.GetPath().Append(FileSystemUsageCache::kUsageFileName);
  }

  FileSystemUsageCache* usage_cache() { return &usage_cache_; }

 private:
  base::test::SingleThreadTaskEnvironment task_environment_;
  base::ScopedTempDir data_dir_;
  FileSystemUsageCache usage_cache_;
};

INSTANTIATE_TEST_SUITE_P(All, FileSystemUsageCacheTest, testing::Bool());

TEST_P(FileSystemUsageCacheTest, CreateTest) {
  base::FilePath usage_file_path = GetUsageFilePath();
  EXPECT_TRUE(usage_cache()->UpdateUsage(usage_file_path, 0));
}

TEST_P(FileSystemUsageCacheTest, SetSizeTest) {
  static const int64_t size = 240122;
  base::FilePath usage_file_path = GetUsageFilePath();
  int64_t usage = 0;
  ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, size));
  EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
  EXPECT_EQ(size, usage);
}

TEST_P(FileSystemUsageCacheTest, SetLargeSizeTest) {
  static const int64_t size = std::numeric_limits<int64_t>::max();
  base::FilePath usage_file_path = GetUsageFilePath();
  int64_t usage = 0;
  ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, size));
  EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
  EXPECT_EQ(size, usage);
}

TEST_P(FileSystemUsageCacheTest, IncAndGetSizeTest) {
  base::FilePath usage_file_path = GetUsageFilePath();
  uint32_t dirty = 0;
  int64_t usage = 0;
  ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, 98214));
  ASSERT_TRUE(usage_cache()->IncrementDirty(usage_file_path));
  EXPECT_TRUE(usage_cache()->GetDirty(usage_file_path, &dirty));
  EXPECT_EQ(1u, dirty);
  EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
  EXPECT_EQ(98214, usage);
}

TEST_P(FileSystemUsageCacheTest, DecAndGetSizeTest) {
  static const int64_t size = 71839;
  base::FilePath usage_file_path = GetUsageFilePath();
  int64_t usage = 0;
  ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, size));
  // DecrementDirty for dirty = 0 is invalid. It returns false.
  ASSERT_FALSE(usage_cache()->DecrementDirty(usage_file_path));
  EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
  EXPECT_EQ(size, usage);
}

TEST_P(FileSystemUsageCacheTest, IncDecAndGetSizeTest) {
  static const int64_t size = 198491;
  base::FilePath usage_file_path = GetUsageFilePath();
  int64_t usage = 0;
  ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, size));
  ASSERT_TRUE(usage_cache()->IncrementDirty(usage_file_path));
  ASSERT_TRUE(usage_cache()->DecrementDirty(usage_file_path));
  EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
  EXPECT_EQ(size, usage);
}

TEST_P(FileSystemUsageCacheTest, DecIncAndGetSizeTest) {
  base::FilePath usage_file_path = GetUsageFilePath();
  uint32_t dirty = 0;
  int64_t usage = 0;
  ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, 854238));
  // DecrementDirty for dirty = 0 is invalid. It returns false.
  ASSERT_FALSE(usage_cache()->DecrementDirty(usage_file_path));
  ASSERT_TRUE(usage_cache()->IncrementDirty(usage_file_path));
  // It tests DecrementDirty (which returns false) has no effect, i.e
  // does not make dirty = -1 after DecrementDirty.
  EXPECT_TRUE(usage_cache()->GetDirty(usage_file_path, &dirty));
  EXPECT_EQ(1u, dirty);
  EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
  EXPECT_EQ(854238, usage);
}

TEST_P(FileSystemUsageCacheTest, ManyIncsSameDecsAndGetSizeTest) {
  static const int64_t size = 82412;
  base::FilePath usage_file_path = GetUsageFilePath();
  int64_t usage = 0;
  ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, size));
  for (int i = 0; i < 20; i++)
    ASSERT_TRUE(usage_cache()->IncrementDirty(usage_file_path));
  for (int i = 0; i < 20; i++)
    ASSERT_TRUE(usage_cache()->DecrementDirty(usage_file_path));
  EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
  EXPECT_EQ(size, usage);
}

TEST_P(FileSystemUsageCacheTest, ManyIncsLessDecsAndGetSizeTest) {
  uint32_t dirty = 0;
  int64_t usage = 0;
  base::FilePath usage_file_path = GetUsageFilePath();
  ASSERT_TRUE(usage_cache()->UpdateUsage(usage_file_path, 19319));
  for (int i = 0; i < 20; i++)
    ASSERT_TRUE(usage_cache()->IncrementDirty(usage_file_path));
  for (int i = 0; i < 19; i++)
    ASSERT_TRUE(usage_cache()->DecrementDirty(usage_file_path));
  EXPECT_TRUE(usage_cache()->GetDirty(usage_file_path, &dirty));
  EXPECT_EQ(1u, dirty);
  EXPECT_TRUE(usage_cache()->GetUsage(usage_file_path, &usage));
  EXPECT_EQ(19319, usage);
}

TEST_P(FileSystemUsageCacheTest, GetSizeWithoutCacheFileTest) {
  int64_t usage = 0;
  base::FilePath usage_file_path = GetUsageFilePath();
  EXPECT_FALSE(usage_cache()->GetUsage(usage_file_path, &usage));
}

TEST_P(FileSystemUsageCacheTest, IncrementDirtyWithoutCacheFileTest) {
  base::FilePath usage_file_path = GetUsageFilePath();
  EXPECT_FALSE(usage_cache()->IncrementDirty(usage_file_path));
}

TEST_P(FileSystemUsageCacheTest, DecrementDirtyWithoutCacheFileTest) {
  base::FilePath usage_file_path = GetUsageFilePath();
  EXPECT_FALSE(usage_cache()->IncrementDirty(usage_file_path));
}

}  // namespace storage