/*
 *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include "api/units/data_size.h"

#include <cstdint>
#include <limits>

#include "test/gtest.h"

namespace webrtc {
namespace test {

TEST(DataSizeTest, ConstExpr) {
  constexpr int64_t kValue = 12345;
  constexpr DataSize kDataSizeZero = DataSize::Zero();
  constexpr DataSize kDataSizeInf = DataSize::Infinity();
  static_assert(DataSize() == kDataSizeZero);
  static_assert(kDataSizeZero.IsZero(), "");
  static_assert(kDataSizeInf.IsInfinite(), "");
  static_assert(kDataSizeInf.bytes_or(-1) == -1, "");
  static_assert(kDataSizeInf > kDataSizeZero, "");

  constexpr DataSize kDataSize = DataSize::Bytes(kValue);
  static_assert(kDataSize.bytes_or(-1) == kValue, "");

  EXPECT_EQ(kDataSize.bytes(), kValue);
}

TEST(DataSizeTest, GetBackSameValues) {
  const int64_t kValue = 123 * 8;
  EXPECT_EQ(DataSize::Bytes(kValue).bytes(), kValue);
}

TEST(DataSizeTest, IdentityChecks) {
  const int64_t kValue = 3000;
  EXPECT_TRUE(DataSize::Zero().IsZero());
  EXPECT_FALSE(DataSize::Bytes(kValue).IsZero());

  EXPECT_TRUE(DataSize::Infinity().IsInfinite());
  EXPECT_FALSE(DataSize::Zero().IsInfinite());
  EXPECT_FALSE(DataSize::Bytes(kValue).IsInfinite());

  EXPECT_FALSE(DataSize::Infinity().IsFinite());
  EXPECT_TRUE(DataSize::Bytes(kValue).IsFinite());
  EXPECT_TRUE(DataSize::Zero().IsFinite());
}

TEST(DataSizeTest, ComparisonOperators) {
  const int64_t kSmall = 450;
  const int64_t kLarge = 451;
  const DataSize small = DataSize::Bytes(kSmall);
  const DataSize large = DataSize::Bytes(kLarge);

  EXPECT_EQ(DataSize::Zero(), DataSize::Bytes(0));
  EXPECT_EQ(DataSize::Infinity(), DataSize::Infinity());
  EXPECT_EQ(small, small);
  EXPECT_LE(small, small);
  EXPECT_GE(small, small);
  EXPECT_NE(small, large);
  EXPECT_LE(small, large);
  EXPECT_LT(small, large);
  EXPECT_GE(large, small);
  EXPECT_GT(large, small);
  EXPECT_LT(DataSize::Zero(), small);
  EXPECT_GT(DataSize::Infinity(), large);
}

TEST(DataSizeTest, ConvertsToAndFromDouble) {
  const int64_t kValue = 128;
  const double kDoubleValue = static_cast<double>(kValue);

  EXPECT_EQ(DataSize::Bytes(kValue).bytes<double>(), kDoubleValue);
  EXPECT_EQ(DataSize::Bytes(kDoubleValue).bytes(), kValue);

  const double kInfinity = std::numeric_limits<double>::infinity();
  EXPECT_EQ(DataSize::Infinity().bytes<double>(), kInfinity);
  EXPECT_TRUE(DataSize::Bytes(kInfinity).IsInfinite());
}

TEST(DataSizeTest, MathOperations) {
  const int64_t kValueA = 450;
  const int64_t kValueB = 267;
  const DataSize size_a = DataSize::Bytes(kValueA);
  const DataSize size_b = DataSize::Bytes(kValueB);
  EXPECT_EQ((size_a + size_b).bytes(), kValueA + kValueB);
  EXPECT_EQ((size_a - size_b).bytes(), kValueA - kValueB);

  const int32_t kInt32Value = 123;
  const double kFloatValue = 123.0;
  EXPECT_EQ((size_a * kValueB).bytes(), kValueA * kValueB);
  EXPECT_EQ((size_a * kInt32Value).bytes(), kValueA * kInt32Value);
  EXPECT_EQ((size_a * kFloatValue).bytes(), kValueA * kFloatValue);

  EXPECT_EQ((size_a / 10).bytes(), kValueA / 10);
  EXPECT_EQ(size_a / size_b, static_cast<double>(kValueA) / kValueB);

  DataSize mutable_size = DataSize::Bytes(kValueA);
  mutable_size += size_b;
  EXPECT_EQ(mutable_size.bytes(), kValueA + kValueB);
  mutable_size -= size_a;
  EXPECT_EQ(mutable_size.bytes(), kValueB);
}
}  // namespace test
}  // namespace webrtc