// 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/power/power_state_override.h"

#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop.h"
#include "chromeos/dbus/mock_power_manager_client.h"
#include "chromeos/dbus/mock_dbus_thread_manager.h"
#include "testing/gtest/include/gtest/gtest.h"

using ::testing::_;
using ::testing::Mock;
using ::testing::SaveArg;

namespace chromeos {

class PowerStateOverrideTest : public testing::Test {
 protected:
  PowerStateOverrideTest() : dbus_thread_manager_shut_down_(false) {}
  virtual ~PowerStateOverrideTest() {}

  virtual void SetUp() {
    MockDBusThreadManager* dbus_manager = new MockDBusThreadManager;
    DBusThreadManager::InitializeForTesting(dbus_manager);
    power_manager_client_ = dbus_manager->mock_power_manager_client();
  }

  virtual void TearDown() {
    if (!dbus_thread_manager_shut_down_)
      DBusThreadManager::Shutdown();
  }

 protected:
  // Shuts down the DBusThreadManager prematurely.
  void ShutDownDBusThreadManager() {
    DBusThreadManager::Shutdown();
    dbus_thread_manager_shut_down_ = true;
  }

  // Needed for PowerStateOverride's timer.
  MessageLoop message_loop_;

  MockPowerManagerClient* power_manager_client_;  // not owned

  // Has the singleton DBusThreadManager already been manually shut down?
  bool dbus_thread_manager_shut_down_;
};

TEST_F(PowerStateOverrideTest, AddAndRemoveOverrides) {
  // An arbitrary ID to return in response to a request with ID 0.
  const uint32 kRequestId = 10;

  // Override bitmaps corresponding to different modes.
  const uint32 kDisplayOverrides =
      PowerManagerClient::DISABLE_IDLE_DIM |
      PowerManagerClient::DISABLE_IDLE_BLANK |
      PowerManagerClient::DISABLE_IDLE_SUSPEND |
      PowerManagerClient::DISABLE_IDLE_LID_SUSPEND;
  const uint32 kSystemOverrides =
      PowerManagerClient::DISABLE_IDLE_SUSPEND |
      PowerManagerClient::DISABLE_IDLE_LID_SUSPEND;

  // Block display sleep and pass a request ID to the callback.
  chromeos::PowerStateRequestIdCallback request_id_callback;
  EXPECT_CALL(*power_manager_client_,
              RequestPowerStateOverrides(0, _, kDisplayOverrides, _))
      .WillOnce(SaveArg<3>(&request_id_callback));
  scoped_refptr<PowerStateOverride> override(
      new PowerStateOverride(PowerStateOverride::BLOCK_DISPLAY_SLEEP));
  // Make sure our PostTask to the request power state overrides runs.
  message_loop_.RunUntilIdle();
  request_id_callback.Run(kRequestId);

  // The request should be canceled when the PowerStateOverride is destroyed.
  EXPECT_CALL(*power_manager_client_, CancelPowerStateOverrides(kRequestId));
  override = NULL;

  // Now send a request to just block the system from suspending.
  EXPECT_CALL(*power_manager_client_,
              RequestPowerStateOverrides(0, _, kSystemOverrides, _))
      .WillOnce(SaveArg<3>(&request_id_callback));
  override = new PowerStateOverride(PowerStateOverride::BLOCK_SYSTEM_SUSPEND);
  // Make sure our PostTask to the request power state overrides runs.
  message_loop_.RunUntilIdle();
  request_id_callback.Run(kRequestId);
  EXPECT_CALL(*power_manager_client_, CancelPowerStateOverrides(kRequestId));
  override = NULL;
}

TEST_F(PowerStateOverrideTest, DBusThreadManagerShutDown) {
  const uint32 kRequestId = 10;
  chromeos::PowerStateRequestIdCallback request_id_callback;
  EXPECT_CALL(*power_manager_client_, RequestPowerStateOverrides(0, _, _, _))
      .WillOnce(SaveArg<3>(&request_id_callback));
  scoped_refptr<PowerStateOverride> override(
      new PowerStateOverride(PowerStateOverride::BLOCK_DISPLAY_SLEEP));
  // Make sure our PostTask to the request power state overrides runs.
  message_loop_.RunUntilIdle();
  request_id_callback.Run(kRequestId);

  // When the DBusThreadManager is about to be shut down, PowerStateOverride
  // should cancel its request.
  EXPECT_CALL(*power_manager_client_, CancelPowerStateOverrides(kRequestId));
  ShutDownDBusThreadManager();
}

}  // namespace chromeos