// Copyright 2018 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 "shill/dhcp/dhcp_provider.h"

#include <base/files/file_util.h>
#include <base/files/scoped_temp_dir.h>
#include <base/strings/stringprintf.h>

#include "shill/dhcp/dhcp_config.h"
#include "shill/dhcp/mock_dhcp_properties.h"
#include "shill/mock_control.h"
#include "shill/mock_event_dispatcher.h"

using base::FilePath;
using base::ScopedTempDir;
using testing::_;
using testing::StrictMock;
using testing::Test;

namespace shill {

namespace {
const char kDeviceName[] = "testdevicename";
const char kStorageIdentifier[] = "teststorageidentifier";
const bool kArpGateway = false;
}  // namespace

class DHCPProviderTest : public Test {
 public:
  DHCPProviderTest() : provider_(DHCPProvider::GetInstance()) {
    provider_->control_interface_ = &control_;
    provider_->dispatcher_ = &dispatcher_;
  }

  void SetUp() {
    // DHCPProvider is a singleton, there is no guarentee that it is
    // not setup/used elsewhere, so reset its state before running our
    // tests.
    provider_->configs_.clear();
    provider_->recently_unbound_pids_.clear();
  }

 protected:
  void RetireUnboundPID(int pid) { provider_->RetireUnboundPID(pid); }

  MockControl control_;
  DHCPProvider* provider_;
  StrictMock<MockEventDispatcher> dispatcher_;
};

TEST_F(DHCPProviderTest, CreateIPv4Config) {
  DhcpProperties dhcp_props(/*manager=*/nullptr);

  DHCPConfigRefPtr config = provider_->CreateIPv4Config(
      kDeviceName, kStorageIdentifier, kArpGateway, dhcp_props);
  EXPECT_NE(nullptr, config);
  EXPECT_EQ(kDeviceName, config->device_name());
  EXPECT_TRUE(provider_->configs_.empty());
}

TEST_F(DHCPProviderTest, DestroyLease) {
  ScopedTempDir temp_dir;
  FilePath lease_file;
  EXPECT_TRUE(temp_dir.CreateUniqueTempDir());
  provider_->root_ = temp_dir.GetPath();
  lease_file = provider_->root_.Append(
      base::StringPrintf(DHCPProvider::kDHCPCDPathFormatLease, kDeviceName));
  EXPECT_TRUE(base::CreateDirectory(lease_file.DirName()));
  EXPECT_EQ(0, base::WriteFile(lease_file, "", 0));
  EXPECT_TRUE(base::PathExists(lease_file));
  provider_->DestroyLease(kDeviceName);
  EXPECT_FALSE(base::PathExists(lease_file));
}

TEST_F(DHCPProviderTest, BindAndUnbind) {
  int kPid = 999;
  EXPECT_EQ(nullptr, provider_->GetConfig(kPid));
  EXPECT_FALSE(provider_->IsRecentlyUnbound(kPid));
  DhcpProperties dhcp_props(/*manager=*/nullptr);

  DHCPConfigRefPtr config = provider_->CreateIPv4Config(
      kDeviceName, kStorageIdentifier, kArpGateway, dhcp_props);
  provider_->BindPID(kPid, config);
  EXPECT_NE(nullptr, provider_->GetConfig(kPid));
  EXPECT_FALSE(provider_->IsRecentlyUnbound(kPid));

  base::Closure task;
  // TODO(pstew): crbug.com/502320
  EXPECT_CALL(dispatcher_, PostDelayedTask(_, _, _));
  provider_->UnbindPID(kPid);
  EXPECT_EQ(nullptr, provider_->GetConfig(kPid));
  EXPECT_TRUE(provider_->IsRecentlyUnbound(kPid));

  RetireUnboundPID(kPid);  // Execute as if the PostDelayedTask() timer expired.
  EXPECT_EQ(nullptr, provider_->GetConfig(kPid));
  EXPECT_FALSE(provider_->IsRecentlyUnbound(kPid));
}

}  // namespace shill