// Copyright (c) 2012 The Chromium 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 "chromeos/network/network_state_handler.h"

#include <map>
#include <set>
#include <string>

#include "base/bind.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop.h"
#include "base/values.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "chromeos/dbus/shill_device_client.h"
#include "chromeos/dbus/shill_manager_client.h"
#include "chromeos/dbus/shill_service_client.h"
#include "chromeos/network/network_state.h"
#include "chromeos/network/network_state_handler_observer.h"
#include "dbus/object_path.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/cros_system_api/dbus/service_constants.h"

namespace {

void ErrorCallbackFunction(const std::string& error_name,
                           const std::string& error_message) {
  LOG(ERROR) << "Shill Error: " << error_name << " : " << error_message;
}

const std::string kShillManagerClientStubDefaultService = "stub_ethernet";
const std::string kShillManagerClientStubDefaultWireless = "stub_wifi1";
const std::string kShillManagerClientStubWireless2 = "stub_wifi2";
const std::string kShillManagerClientStubCellular = "stub_cellular";

using chromeos::NetworkState;
using chromeos::NetworkStateHandler;

class TestObserver : public chromeos::NetworkStateHandlerObserver {
 public:
  explicit TestObserver(NetworkStateHandler* handler)
      : handler_(handler),
        manager_changed_count_(0),
        network_count_(0),
        default_network_change_count_(0) {
  }

  virtual ~TestObserver() {
  }

  virtual void NetworkManagerChanged() OVERRIDE {
    ++manager_changed_count_;
  }

  virtual void NetworkListChanged() OVERRIDE {
    NetworkStateHandler::NetworkStateList networks;
    handler_->GetNetworkList(&networks);
    network_count_ = networks.size();
    if (network_count_ == 0) {
      default_network_ = "";
      default_network_connection_state_ = "";
    }
  }

  virtual void DefaultNetworkChanged(const NetworkState* network) OVERRIDE {
    ++default_network_change_count_;
    default_network_ = network ? network->path() : "";
    default_network_connection_state_ =
        network ?  network->connection_state() : "";
  }

  virtual void NetworkConnectionStateChanged(
      const NetworkState* network) OVERRIDE {
    network_connection_state_[network->path()] = network->connection_state();
    connection_state_changes_[network->path()]++;
  }

  virtual void NetworkPropertiesUpdated(const NetworkState* network) OVERRIDE {
    DCHECK(network);
    property_updates_[network->path()]++;
  }

  size_t manager_changed_count() { return manager_changed_count_; }
  size_t network_count() { return network_count_; }
  size_t default_network_change_count() {
    return default_network_change_count_;
  }
  std::string default_network() { return default_network_; }
  std::string default_network_connection_state() {
    return default_network_connection_state_;
  }

  int PropertyUpdatesForService(const std::string& service_path) {
    return property_updates_[service_path];
  }

  int ConnectionStateChangesForService(const std::string& service_path) {
    return connection_state_changes_[service_path];
  }

  std::string NetworkConnectionStateForService(
      const std::string& service_path) {
    return network_connection_state_[service_path];
  }

 private:
  NetworkStateHandler* handler_;
  size_t manager_changed_count_;
  size_t network_count_;
  size_t default_network_change_count_;
  std::string default_network_;
  std::string default_network_connection_state_;
  std::map<std::string, int> property_updates_;
  std::map<std::string, int> connection_state_changes_;
  std::map<std::string, std::string> network_connection_state_;

  DISALLOW_COPY_AND_ASSIGN(TestObserver);
};

}  // namespace

namespace chromeos {

class NetworkStateHandlerTest : public testing::Test {
 public:
  NetworkStateHandlerTest() {}
  virtual ~NetworkStateHandlerTest() {}

  virtual void SetUp() OVERRIDE {
    // Initialize DBusThreadManager with a stub implementation.
    DBusThreadManager::InitializeWithStub();
    SetupNetworkStateHandler();
    message_loop_.RunUntilIdle();
  }

  virtual void TearDown() OVERRIDE {
    network_state_handler_.reset();
    test_observer_.reset();
    DBusThreadManager::Shutdown();
  }

  void SetupNetworkStateHandler() {
    SetupDefaultShillState();
    network_state_handler_.reset(new NetworkStateHandler);
    test_observer_.reset(new TestObserver(network_state_handler_.get()));
    network_state_handler_->AddObserver(test_observer_.get());
    network_state_handler_->InitShillPropertyHandler();
  }

 protected:
  void SetupDefaultShillState() {
    message_loop_.RunUntilIdle();  // Process any pending updates
    ShillDeviceClient::TestInterface* device_test =
        DBusThreadManager::Get()->GetShillDeviceClient()->GetTestInterface();
    device_test->ClearDevices();
    device_test->AddDevice("/device/stub_wifi_device1",
                           flimflam::kTypeWifi, "stub_wifi_device1");
    device_test->AddDevice("/device/stub_cellular_device1",
                           flimflam::kTypeCellular, "stub_cellular_device1");

    ShillServiceClient::TestInterface* service_test =
        DBusThreadManager::Get()->GetShillServiceClient()->GetTestInterface();
    service_test->ClearServices();
    const bool add_to_watchlist = true;
    service_test->AddService(kShillManagerClientStubDefaultService,
                             kShillManagerClientStubDefaultService,
                             flimflam::kTypeEthernet, flimflam::kStateOnline,
                             add_to_watchlist);
    service_test->AddService(kShillManagerClientStubDefaultWireless,
                             kShillManagerClientStubDefaultWireless,
                             flimflam::kTypeWifi, flimflam::kStateOnline,
                             add_to_watchlist);
    service_test->AddService(kShillManagerClientStubWireless2,
                             kShillManagerClientStubWireless2,
                             flimflam::kTypeWifi, flimflam::kStateIdle,
                             add_to_watchlist);
    service_test->AddService(kShillManagerClientStubCellular,
                             kShillManagerClientStubCellular,
                             flimflam::kTypeCellular, flimflam::kStateIdle,
                             add_to_watchlist);
  }

  MessageLoopForUI message_loop_;
  scoped_ptr<NetworkStateHandler> network_state_handler_;
  scoped_ptr<TestObserver> test_observer_;

 private:
  DISALLOW_COPY_AND_ASSIGN(NetworkStateHandlerTest);
};

TEST_F(NetworkStateHandlerTest, NetworkStateHandlerStub) {
  EXPECT_EQ(1u, test_observer_->manager_changed_count());
  // Ensure that the network list is the expected size.
  const size_t kNumShillManagerClientStubImplServices = 4;
  EXPECT_EQ(kNumShillManagerClientStubImplServices,
            test_observer_->network_count());
  // Ensure that the first stub network is the default network.
  EXPECT_EQ(kShillManagerClientStubDefaultService,
            test_observer_->default_network());
  EXPECT_EQ(kShillManagerClientStubDefaultService,
            network_state_handler_->ConnectedNetworkByType(
                NetworkStateHandler::kMatchTypeDefault)->path());
  EXPECT_EQ(kShillManagerClientStubDefaultService,
            network_state_handler_->ConnectedNetworkByType(
                flimflam::kTypeEthernet)->path());
  EXPECT_EQ(kShillManagerClientStubDefaultWireless,
            network_state_handler_->ConnectedNetworkByType(
                NetworkStateHandler::kMatchTypeWireless)->path());
  EXPECT_EQ(flimflam::kStateOnline,
            test_observer_->default_network_connection_state());
}

TEST_F(NetworkStateHandlerTest, TechnologyChanged) {
  EXPECT_EQ(1u, test_observer_->manager_changed_count());
  // Enable a technology.
  EXPECT_NE(NetworkStateHandler::TECHNOLOGY_ENABLED,
            network_state_handler_->GetTechnologyState(flimflam::kTypeWimax));
  network_state_handler_->SetTechnologyEnabled(
      flimflam::kTypeWimax, true, network_handler::ErrorCallback());
  // The technology state should immediately change to ENABLING and we should
  // receive a manager changed callback.
  EXPECT_EQ(2u, test_observer_->manager_changed_count());
  EXPECT_EQ(NetworkStateHandler::TECHNOLOGY_ENABLING,
            network_state_handler_->GetTechnologyState(flimflam::kTypeWimax));
  message_loop_.RunUntilIdle();
  // Ensure we receive another manager changed callbacks when the technology
  // becomes enabled.
  EXPECT_EQ(3u, test_observer_->manager_changed_count());
  EXPECT_EQ(NetworkStateHandler::TECHNOLOGY_ENABLED,
            network_state_handler_->GetTechnologyState(flimflam::kTypeWimax));
}

TEST_F(NetworkStateHandlerTest, TechnologyState) {
  ShillManagerClient::TestInterface* manager_test =
      DBusThreadManager::Get()->GetShillManagerClient()->GetTestInterface();
  EXPECT_EQ(NetworkStateHandler::TECHNOLOGY_UNAVAILABLE,
            network_state_handler_->GetTechnologyState(flimflam::kTypeWimax));

  manager_test->AddTechnology(flimflam::kTypeWimax, false);
  message_loop_.RunUntilIdle();
  EXPECT_EQ(NetworkStateHandler::TECHNOLOGY_AVAILABLE,
            network_state_handler_->GetTechnologyState(flimflam::kTypeWimax));

  manager_test->SetTechnologyInitializing(flimflam::kTypeWimax, true);
  message_loop_.RunUntilIdle();
  EXPECT_EQ(NetworkStateHandler::TECHNOLOGY_UNINITIALIZED,
            network_state_handler_->GetTechnologyState(flimflam::kTypeWimax));

  manager_test->SetTechnologyInitializing(flimflam::kTypeWimax, false);
  network_state_handler_->SetTechnologyEnabled(
      flimflam::kTypeWimax, true, network_handler::ErrorCallback());
  message_loop_.RunUntilIdle();
  EXPECT_EQ(NetworkStateHandler::TECHNOLOGY_ENABLED,
            network_state_handler_->GetTechnologyState(flimflam::kTypeWimax));

  manager_test->RemoveTechnology(flimflam::kTypeWimax);
  message_loop_.RunUntilIdle();
  EXPECT_EQ(NetworkStateHandler::TECHNOLOGY_UNAVAILABLE,
            network_state_handler_->GetTechnologyState(flimflam::kTypeWimax));
}

TEST_F(NetworkStateHandlerTest, ServicePropertyChanged) {
  // Set a service property.
  const std::string eth0 = "stub_ethernet";
  EXPECT_EQ("", network_state_handler_->GetNetworkState(eth0)->security());
  EXPECT_EQ(1, test_observer_->PropertyUpdatesForService(eth0));
  base::StringValue security_value("TestSecurity");
  DBusThreadManager::Get()->GetShillServiceClient()->SetProperty(
      dbus::ObjectPath(eth0),
      flimflam::kSecurityProperty, security_value,
      base::Bind(&base::DoNothing), base::Bind(&ErrorCallbackFunction));
  message_loop_.RunUntilIdle();
  EXPECT_EQ("TestSecurity",
            network_state_handler_->GetNetworkState(eth0)->security());
  EXPECT_EQ(2, test_observer_->PropertyUpdatesForService(eth0));
}

TEST_F(NetworkStateHandlerTest, NetworkConnectionStateChanged) {
  // Change a network state.
  ShillServiceClient::TestInterface* service_test =
      DBusThreadManager::Get()->GetShillServiceClient()->GetTestInterface();
  const std::string eth0 = "stub_ethernet";
  base::StringValue connection_state_idle_value(flimflam::kStateIdle);
  service_test->SetServiceProperty(eth0, flimflam::kStateProperty,
                                   connection_state_idle_value);
  message_loop_.RunUntilIdle();
  EXPECT_EQ(flimflam::kStateIdle,
            test_observer_->NetworkConnectionStateForService(eth0));
  EXPECT_EQ(2, test_observer_->ConnectionStateChangesForService(eth0));
  // Confirm that changing the connection state to the same value does *not*
  // signal the observer.
  service_test->SetServiceProperty(eth0, flimflam::kStateProperty,
                                   connection_state_idle_value);
  message_loop_.RunUntilIdle();
  EXPECT_EQ(2, test_observer_->ConnectionStateChangesForService(eth0));
}

TEST_F(NetworkStateHandlerTest, DefaultServiceChanged) {
  ShillManagerClient::TestInterface* manager_test =
      DBusThreadManager::Get()->GetShillManagerClient()->GetTestInterface();
  ASSERT_TRUE(manager_test);
  ShillServiceClient::TestInterface* service_test =
      DBusThreadManager::Get()->GetShillServiceClient()->GetTestInterface();
  ASSERT_TRUE(service_test);

  // Change the default network by inserting wifi1 at the front of the list
  // and changing the state of stub_ethernet to Idle.
  const std::string wifi1 = "stub_wifi1";
  manager_test->AddServiceAtIndex(wifi1, 0, true);
  const std::string eth0 = "stub_ethernet";
  base::StringValue connection_state_idle_value(flimflam::kStateIdle);
  service_test->SetServiceProperty(eth0, flimflam::kStateProperty,
                                   connection_state_idle_value);
  message_loop_.RunUntilIdle();
  EXPECT_EQ(wifi1, test_observer_->default_network());
  EXPECT_EQ(flimflam::kStateOnline,
            test_observer_->default_network_connection_state());
  // We should have seen 2 default network updates - for the default
  // service change, and for the state change.
  EXPECT_EQ(2u, test_observer_->default_network_change_count());

  // Updating a property on the default network should trigger
  // a default network change.
  DBusThreadManager::Get()->GetShillServiceClient()->SetProperty(
      dbus::ObjectPath(wifi1),
      flimflam::kSecurityProperty, base::StringValue("TestSecurity"),
      base::Bind(&base::DoNothing), base::Bind(&ErrorCallbackFunction));
  message_loop_.RunUntilIdle();
  EXPECT_EQ(3u, test_observer_->default_network_change_count());

  // No default network updates for signal strength changes.
  DBusThreadManager::Get()->GetShillServiceClient()->SetProperty(
      dbus::ObjectPath(wifi1),
      flimflam::kSignalStrengthProperty, base::FundamentalValue(32),
      base::Bind(&base::DoNothing), base::Bind(&ErrorCallbackFunction));
  message_loop_.RunUntilIdle();
  EXPECT_EQ(3u, test_observer_->default_network_change_count());
}

}  // namespace chromeos