// Copyright 2013 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 "base/test/power_monitor_test_base.h"
#include "content/browser/power_monitor_message_broadcaster.h"
#include "content/common/power_monitor_messages.h"
#include "ipc/ipc_sender.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace content {

class PowerMonitorMessageSender : public IPC::Sender {
 public:
  PowerMonitorMessageSender()
      : power_state_changes_(0),
        suspends_(0),
        resumes_(0) {
  }
  virtual ~PowerMonitorMessageSender() {}

  virtual bool Send(IPC::Message* msg) OVERRIDE {
    switch (msg->type()) {
      case PowerMonitorMsg_Suspend::ID:
        suspends_++;
        break;
      case PowerMonitorMsg_Resume::ID:
        resumes_++;
        break;
      case PowerMonitorMsg_PowerStateChange::ID:
        power_state_changes_++;
        break;
    }
    delete msg;
    return true;
  };

  // Test status counts.
  int power_state_changes() { return power_state_changes_; }
  int suspends() { return suspends_; }
  int resumes() { return resumes_; }

 private:
  int power_state_changes_;  // Count of OnPowerStateChange notifications.
  int suspends_;  // Count of OnSuspend notifications.
  int resumes_;  // Count of OnResume notifications.
};

class PowerMonitorMessageBroadcasterTest : public testing::Test {
 protected:
  PowerMonitorMessageBroadcasterTest() {
    power_monitor_source_ = new base::PowerMonitorTestSource();
    power_monitor_.reset(new base::PowerMonitor(
        scoped_ptr<base::PowerMonitorSource>(power_monitor_source_)));
  }
  virtual ~PowerMonitorMessageBroadcasterTest() {};

  base::PowerMonitorTestSource* source() { return power_monitor_source_; }
  base::PowerMonitor* monitor() { return power_monitor_.get(); }

 private:
  base::PowerMonitorTestSource* power_monitor_source_;
  scoped_ptr<base::PowerMonitor> power_monitor_;

  DISALLOW_COPY_AND_ASSIGN(PowerMonitorMessageBroadcasterTest);
};

TEST_F(PowerMonitorMessageBroadcasterTest, PowerMessageBroadcast) {
  PowerMonitorMessageSender sender;
  PowerMonitorMessageBroadcaster broadcaster(&sender);

  // Calling Init should invoke a power state change.
  broadcaster.Init();
  EXPECT_EQ(sender.power_state_changes(), 1);

  // Sending resume when not suspended should have no effect.
  source()->GenerateResumeEvent();
  EXPECT_EQ(sender.resumes(), 0);

  // Pretend we suspended.
  source()->GenerateSuspendEvent();
  EXPECT_EQ(sender.suspends(), 1);

  // Send a second suspend notification.  This should be suppressed.
  source()->GenerateSuspendEvent();
  EXPECT_EQ(sender.suspends(), 1);

  // Pretend we were awakened.
  source()->GenerateResumeEvent();
  EXPECT_EQ(sender.resumes(), 1);

  // Send a duplicate resume notification.  This should be suppressed.
  source()->GenerateResumeEvent();
  EXPECT_EQ(sender.resumes(), 1);

  // Pretend the device has gone on battery power
  source()->GeneratePowerStateEvent(true);
  EXPECT_EQ(sender.power_state_changes(), 2);

  // Repeated indications the device is on battery power should be suppressed.
  source()->GeneratePowerStateEvent(true);
  EXPECT_EQ(sender.power_state_changes(), 2);

  // Pretend the device has gone off battery power
  source()->GeneratePowerStateEvent(false);
  EXPECT_EQ(sender.power_state_changes(), 3);

  // Repeated indications the device is off battery power should be suppressed.
  source()->GeneratePowerStateEvent(false);
  EXPECT_EQ(sender.power_state_changes(), 3);
}

}  // namespace base