// Copyright 2014 The Chromium OS 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 "update_engine/fake_prefs.h"

#include <gtest/gtest.h>

using std::map;
using std::string;

using chromeos_update_engine::FakePrefs;

namespace {

void CheckNotNull(const string& key, void* ptr) {
  EXPECT_NE(nullptr, ptr)
      << "Called Get*() for key \"" << key << "\" with a null parameter.";
}

}  // namespace

namespace chromeos_update_engine {

// Compile-time type-dependent constants definitions.
template<>
FakePrefs::PrefType const FakePrefs::PrefConsts<string>::type =
    FakePrefs::PrefType::kString;
template<>
string FakePrefs::PrefValue::* const  // NOLINT(runtime/string), not static str.
    FakePrefs::PrefConsts<string>::member = &FakePrefs::PrefValue::as_str;

template<>
FakePrefs::PrefType const FakePrefs::PrefConsts<int64_t>::type =
    FakePrefs::PrefType::kInt64;
template<>
int64_t FakePrefs::PrefValue::* const FakePrefs::PrefConsts<int64_t>::member =
    &FakePrefs::PrefValue::as_int64;

template<>
FakePrefs::PrefType const FakePrefs::PrefConsts<bool>::type =
    FakePrefs::PrefType::kBool;
template<>
bool FakePrefs::PrefValue::* const FakePrefs::PrefConsts<bool>::member =
    &FakePrefs::PrefValue::as_bool;


bool FakePrefs::GetString(const string& key, string* value) {
  return GetValue(key, value);
}

bool FakePrefs::SetString(const std::string& key, const std::string& value) {
  SetValue(key, value);
  return true;
}

bool FakePrefs::GetInt64(const string& key, int64_t* value) {
  return GetValue(key, value);
}

bool FakePrefs::SetInt64(const string& key, const int64_t value) {
  SetValue(key, value);
  return true;
}

bool FakePrefs::GetBoolean(const std::string& key, bool* value) {
  return GetValue(key, value);
}

bool FakePrefs::SetBoolean(const string& key, const bool value) {
  SetValue(key, value);
  return true;
}

bool FakePrefs::Exists(const string& key) {
  return values_.find(key) != values_.end();
}

bool FakePrefs::Delete(const string& key) {
  if (values_.find(key) == values_.end())
    return false;
  values_.erase(key);
  return true;
}

string FakePrefs::GetTypeName(PrefType type) {
  switch (type) {
    case PrefType::kString:
      return "string";
    case PrefType::kInt64:
      return "int64_t";
    case PrefType::kBool:
      return "bool";
  }
  return "Unknown";
}

void FakePrefs::CheckKeyType(const string& key, PrefType type) const {
  auto it = values_.find(key);
  EXPECT_TRUE(it == values_.end() || it->second.type == type)
      << "Key \"" << key << "\" if defined as " << GetTypeName(it->second.type)
      << " but is accessed as a " << GetTypeName(type);
}

template<typename T>
void FakePrefs::SetValue(const string& key, const T& value) {
  CheckKeyType(key, PrefConsts<T>::type);
  values_[key].type = PrefConsts<T>::type;
  values_[key].value.*(PrefConsts<T>::member) = value;
}

template<typename T>
bool FakePrefs::GetValue(const string& key, T* value) const {
  CheckKeyType(key, PrefConsts<T>::type);
  auto it = values_.find(key);
  if (it == values_.end())
    return false;
  CheckNotNull(key, value);
  *value = it->second.value.*(PrefConsts<T>::member);
  return true;
}

}  // namespace chromeos_update_engine