// 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 <string>

#include "ash/magnifier/magnifier_constants.h"
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/command_line.h"
#include "base/compiler_specific.h"
#include "base/files/scoped_temp_dir.h"
#include "base/location.h"
#include "base/message_loop.h"
#include "base/prefs/pref_change_registrar.h"
#include "base/prefs/pref_service.h"
#include "base/run_loop.h"
#include "base/values.h"
#include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
#include "chrome/browser/chromeos/accessibility/magnification_manager.h"
#include "chrome/browser/chromeos/policy/device_policy_builder.h"
#include "chrome/browser/chromeos/policy/device_policy_cros_browser_test.h"
#include "chrome/browser/chromeos/profiles/profile_helper.h"
#include "chrome/browser/chromeos/settings/device_settings_service.h"
#include "chrome/browser/lifetime/application_lifetime.h"
#include "chrome/browser/policy/proto/chromeos/chrome_device_policy.pb.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/common/pref_names.h"
#include "chromeos/chromeos_switches.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace em = enterprise_management;

namespace policy {

namespace {

const em::AccessibilitySettingsProto_ScreenMagnifierType kFullScreenMagnifier =
    em::AccessibilitySettingsProto_ScreenMagnifierType_SCREEN_MAGNIFIER_TYPE_FULL;

// Spins the loop until a notification is received from |prefs| that the value
// of |pref_name| has changed. If the notification is received before Wait()
// has been called, Wait() returns immediately and no loop is spun.
class PrefChangeWatcher {
 public:
  PrefChangeWatcher(const char* pref_name, PrefService* prefs);

  void Wait();

  void OnPrefChange();

 private:
  bool pref_changed_;

  base::RunLoop run_loop_;
  PrefChangeRegistrar registrar_;

  DISALLOW_COPY_AND_ASSIGN(PrefChangeWatcher);
};

PrefChangeWatcher::PrefChangeWatcher(const char* pref_name,
                                     PrefService* prefs)
    : pref_changed_(false) {
  registrar_.Init(prefs);
  registrar_.Add(pref_name, base::Bind(&PrefChangeWatcher::OnPrefChange,
                                       base::Unretained(this)));
}

void PrefChangeWatcher::Wait() {
  if (!pref_changed_)
    run_loop_.Run();
}

void PrefChangeWatcher::OnPrefChange() {
  pref_changed_ = true;
  run_loop_.Quit();
}

}  // namespace

class LoginScreenDefaultPolicyBrowsertestBase
    : public DevicePolicyCrosBrowserTest {
 protected:
  LoginScreenDefaultPolicyBrowsertestBase();
  virtual ~LoginScreenDefaultPolicyBrowsertestBase();

  // DevicePolicyCrosBrowserTest:
  virtual void SetUpInProcessBrowserTestFixture() OVERRIDE;
  virtual void SetUpOnMainThread() OVERRIDE;

  void RefreshDevicePolicyAndWaitForPrefChange(const char* pref_name);

  Profile* login_profile_;

 private:
  DISALLOW_COPY_AND_ASSIGN(LoginScreenDefaultPolicyBrowsertestBase);
};

class LoginScreenDefaultPolicyLoginScreenBrowsertest
    : public LoginScreenDefaultPolicyBrowsertestBase {
 protected:
  LoginScreenDefaultPolicyLoginScreenBrowsertest();
  virtual ~LoginScreenDefaultPolicyLoginScreenBrowsertest();

  // LoginScreenDefaultPolicyBrowsertestBase:
  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE;
  virtual void SetUpOnMainThread() OVERRIDE;
  virtual void CleanUpOnMainThread() OVERRIDE;

  void VerifyPrefFollowsRecommendation(const char* pref_name,
                                       const base::Value& recommended_value);

 private:
  DISALLOW_COPY_AND_ASSIGN(LoginScreenDefaultPolicyLoginScreenBrowsertest);
};

class LoginScreenDefaultPolicyInSessionBrowsertest
    : public LoginScreenDefaultPolicyBrowsertestBase {
 protected:
  LoginScreenDefaultPolicyInSessionBrowsertest();
  virtual ~LoginScreenDefaultPolicyInSessionBrowsertest();

  // LoginScreenDefaultPolicyBrowsertestBase:
  virtual void SetUpOnMainThread() OVERRIDE;

  void VerifyPrefFollowsDefault(const char* pref_name);

 private:
  DISALLOW_COPY_AND_ASSIGN(LoginScreenDefaultPolicyInSessionBrowsertest);
};

LoginScreenDefaultPolicyBrowsertestBase::
    LoginScreenDefaultPolicyBrowsertestBase() : login_profile_(NULL) {
}

LoginScreenDefaultPolicyBrowsertestBase::
    ~LoginScreenDefaultPolicyBrowsertestBase() {
}

void LoginScreenDefaultPolicyBrowsertestBase::
    SetUpInProcessBrowserTestFixture() {
  InstallOwnerKey();
  MarkAsEnterpriseOwned(&temp_dir_);
  DevicePolicyCrosBrowserTest::SetUpInProcessBrowserTestFixture();
}

void LoginScreenDefaultPolicyBrowsertestBase::SetUpOnMainThread() {
  DevicePolicyCrosBrowserTest::SetUpOnMainThread();
  login_profile_ = chromeos::ProfileHelper::GetSigninProfile();
  ASSERT_TRUE(login_profile_);
}

void LoginScreenDefaultPolicyBrowsertestBase::
    RefreshDevicePolicyAndWaitForPrefChange(const char* pref_name) {
  PrefChangeWatcher watcher(pref_name, login_profile_->GetPrefs());
  RefreshDevicePolicy();
  watcher.Wait();
}

LoginScreenDefaultPolicyLoginScreenBrowsertest::
    LoginScreenDefaultPolicyLoginScreenBrowsertest() {
}

LoginScreenDefaultPolicyLoginScreenBrowsertest::
    ~LoginScreenDefaultPolicyLoginScreenBrowsertest() {
}

void LoginScreenDefaultPolicyLoginScreenBrowsertest::SetUpCommandLine(
    CommandLine* command_line) {
  LoginScreenDefaultPolicyBrowsertestBase::SetUpCommandLine(command_line);
  command_line->AppendSwitch(chromeos::switches::kLoginManager);
  command_line->AppendSwitch(chromeos::switches::kForceLoginManagerInTests);
}

void LoginScreenDefaultPolicyLoginScreenBrowsertest::SetUpOnMainThread() {
  LoginScreenDefaultPolicyBrowsertestBase::SetUpOnMainThread();

  // Set the login screen profile.
  chromeos::AccessibilityManager* accessibility_manager =
      chromeos::AccessibilityManager::Get();
  ASSERT_TRUE(accessibility_manager);
  accessibility_manager->SetProfileForTest(
      chromeos::ProfileHelper::GetSigninProfile());

  chromeos::MagnificationManager* magnification_manager =
      chromeos::MagnificationManager::Get();
  ASSERT_TRUE(magnification_manager);
  magnification_manager->SetProfileForTest(
      chromeos::ProfileHelper::GetSigninProfile());
}

void LoginScreenDefaultPolicyLoginScreenBrowsertest::CleanUpOnMainThread() {
  base::MessageLoop::current()->PostTask(FROM_HERE,
                                         base::Bind(&chrome::AttemptExit));
  base::RunLoop().RunUntilIdle();
  LoginScreenDefaultPolicyBrowsertestBase::CleanUpOnMainThread();
}

void LoginScreenDefaultPolicyLoginScreenBrowsertest::
    VerifyPrefFollowsRecommendation(const char* pref_name,
                                    const base::Value& recommended_value) {
  const PrefService::Preference* pref =
      login_profile_->GetPrefs()->FindPreference(pref_name);
  ASSERT_TRUE(pref);
  EXPECT_FALSE(pref->IsManaged());
  EXPECT_FALSE(pref->IsDefaultValue());
  EXPECT_TRUE(base::Value::Equals(&recommended_value, pref->GetValue()));
  EXPECT_TRUE(base::Value::Equals(&recommended_value,
                                  pref->GetRecommendedValue()));
}

LoginScreenDefaultPolicyInSessionBrowsertest::
    LoginScreenDefaultPolicyInSessionBrowsertest() {
}

LoginScreenDefaultPolicyInSessionBrowsertest::
    ~LoginScreenDefaultPolicyInSessionBrowsertest() {
}

void LoginScreenDefaultPolicyInSessionBrowsertest::SetUpOnMainThread() {
  LoginScreenDefaultPolicyBrowsertestBase::SetUpOnMainThread();

  // Tell the DeviceSettingsService that there is no local owner.
  chromeos::DeviceSettingsService::Get()->SetUsername(std::string());
}

void LoginScreenDefaultPolicyInSessionBrowsertest::VerifyPrefFollowsDefault(
    const char* pref_name) {
  Profile* profile = ProfileManager::GetDefaultProfile();
  ASSERT_TRUE(profile);
  const PrefService::Preference* pref =
      profile->GetPrefs()->FindPreference(pref_name);
  ASSERT_TRUE(pref);
  EXPECT_FALSE(pref->IsManaged());
  EXPECT_TRUE(pref->IsDefaultValue());
  EXPECT_FALSE(pref->GetRecommendedValue());
}

IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyLoginScreenBrowsertest,
                       DeviceLoginScreenDefaultLargeCursorEnabled) {
  // Verifies that the default state of the large cursor accessibility feature
  // on the login screen can be controlled through device policy.

  // Enable the large cursor through device policy and wait for the change to
  // take effect.
  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
  proto.mutable_accessibility_settings()->
      set_login_screen_default_large_cursor_enabled(true);
  RefreshDevicePolicyAndWaitForPrefChange(prefs::kLargeCursorEnabled);

  // Verify that the pref which controls the large cursor in the login profile
  // has changed to the policy-supplied default.
  VerifyPrefFollowsRecommendation(prefs::kLargeCursorEnabled,
                                  base::FundamentalValue(true));

  // Verify that the large cursor is enabled.
  chromeos::AccessibilityManager* accessibility_manager =
      chromeos::AccessibilityManager::Get();
  ASSERT_TRUE(accessibility_manager);
  EXPECT_TRUE(accessibility_manager->IsLargeCursorEnabled());
}

IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyLoginScreenBrowsertest,
                       DeviceLoginScreenDefaultSpokenFeedbackEnabled) {
  // Verifies that the default state of the spoken feedback accessibility
  // feature on the login screen can be controlled through device policy.

  // Enable spoken feedback through device policy and wait for the change to
  // take effect.
  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
  proto.mutable_accessibility_settings()->
      set_login_screen_default_spoken_feedback_enabled(true);
  RefreshDevicePolicyAndWaitForPrefChange(prefs::kSpokenFeedbackEnabled);

  // Verify that the pref which controls spoken feedback in the login profile
  // has changed to the policy-supplied default.
  VerifyPrefFollowsRecommendation(prefs::kSpokenFeedbackEnabled,
                                  base::FundamentalValue(true));

  // Verify that spoken feedback is enabled.
  chromeos::AccessibilityManager* accessibility_manager =
      chromeos::AccessibilityManager::Get();
  ASSERT_TRUE(accessibility_manager);
  EXPECT_TRUE(accessibility_manager->IsSpokenFeedbackEnabled());
}

IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyLoginScreenBrowsertest,
                       DeviceLoginScreenDefaultHighContrastEnabled) {
  // Verifies that the default state of the high contrast mode accessibility
  // feature on the login screen can be controlled through device policy.

  // Enable high contrast mode through device policy and wait for the change to
  // take effect.
  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
  proto.mutable_accessibility_settings()->
      set_login_screen_default_high_contrast_enabled(true);
  RefreshDevicePolicyAndWaitForPrefChange(prefs::kHighContrastEnabled);

  // Verify that the pref which controls high contrast mode in the login profile
  // has changed to the policy-supplied default.
  VerifyPrefFollowsRecommendation(prefs::kHighContrastEnabled,
                                  base::FundamentalValue(true));

  // Verify that high contrast mode is enabled.
  chromeos::AccessibilityManager* accessibility_manager =
      chromeos::AccessibilityManager::Get();
  ASSERT_TRUE(accessibility_manager);
  EXPECT_TRUE(accessibility_manager->IsHighContrastEnabled());
}

IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyLoginScreenBrowsertest,
                       DeviceLoginScreenDefaultScreenMagnifierType) {
  // Verifies that the default screen magnifier type enabled on the login screen
  // can be controlled through device policy.

  // Set the screen magnifier type through device policy and wait for the change
  // to take effect.
  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
  proto.mutable_accessibility_settings()->
      set_login_screen_default_screen_magnifier_type(kFullScreenMagnifier);
  RefreshDevicePolicyAndWaitForPrefChange(prefs::kScreenMagnifierType);

  // Verify that the prefs which control the screen magnifier type have changed
  // to the policy-supplied default.
  VerifyPrefFollowsRecommendation(prefs::kScreenMagnifierEnabled,
                                  base::FundamentalValue(true));
  VerifyPrefFollowsRecommendation(prefs::kScreenMagnifierType,
                                  base::FundamentalValue(ash::MAGNIFIER_FULL));

  // Verify that the full-screen magnifier is enabled.
  chromeos::MagnificationManager* magnification_manager =
      chromeos::MagnificationManager::Get();
  ASSERT_TRUE(magnification_manager);
  EXPECT_TRUE(magnification_manager->IsMagnifierEnabled());
  EXPECT_EQ(ash::MAGNIFIER_FULL, magnification_manager->GetMagnifierType());
}

IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyInSessionBrowsertest,
                       DeviceLoginScreenDefaultLargeCursorEnabled) {
  // Verifies that changing the default state of the large cursor accessibility
  // feature on the login screen through policy does not affect its state in a
  // session.

  // Enable the large cursor through device policy and wait for the change to
  // take effect.
  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
  proto.mutable_accessibility_settings()->
      set_login_screen_default_large_cursor_enabled(true);
  RefreshDevicePolicyAndWaitForPrefChange(prefs::kLargeCursorEnabled);

  // Verify that the pref which controls the large cursor in the session is
  // unchanged.
  VerifyPrefFollowsDefault(prefs::kLargeCursorEnabled);

  // Verify that the large cursor is disabled.
  chromeos::AccessibilityManager* accessibility_manager =
      chromeos::AccessibilityManager::Get();
  ASSERT_TRUE(accessibility_manager);
  EXPECT_FALSE(accessibility_manager->IsLargeCursorEnabled());
}

IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyInSessionBrowsertest,
                       DeviceLoginScreenDefaultSpokenFeedbackEnabled) {
  // Verifies that changing the default state of the spoken feedback
  // accessibility feature on the login screen through policy does not affect
  // its state in a session.

  // Enable spoken feedback through device policy and wait for the change to
  // take effect.
  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
  proto.mutable_accessibility_settings()->
      set_login_screen_default_spoken_feedback_enabled(true);
  RefreshDevicePolicyAndWaitForPrefChange(prefs::kSpokenFeedbackEnabled);

  // Verify that the pref which controls the spoken feedback in the session is
  // unchanged.
  VerifyPrefFollowsDefault(prefs::kSpokenFeedbackEnabled);

  // Verify that spoken feedback is disabled.
  chromeos::AccessibilityManager* accessibility_manager =
      chromeos::AccessibilityManager::Get();
  ASSERT_TRUE(accessibility_manager);
  EXPECT_FALSE(accessibility_manager->IsSpokenFeedbackEnabled());
}

IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyInSessionBrowsertest,
                       DeviceLoginScreenDefaultHighContrastEnabled) {
  // Verifies that changing the default state of the high contrast mode
  // accessibility feature on the login screen through policy does not affect
  // its state in a session.

  // Enable high contrast mode through device policy and wait for the change to
  // take effect.
  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
  proto.mutable_accessibility_settings()->
      set_login_screen_default_high_contrast_enabled(true);
  RefreshDevicePolicyAndWaitForPrefChange(prefs::kHighContrastEnabled);

  // Verify that the pref which controls high contrast mode in the session is
  // unchanged.
  VerifyPrefFollowsDefault(prefs::kHighContrastEnabled);

  // Verify that high contrast mode is disabled.
  chromeos::AccessibilityManager* accessibility_manager =
      chromeos::AccessibilityManager::Get();
  ASSERT_TRUE(accessibility_manager);
  EXPECT_FALSE(accessibility_manager->IsHighContrastEnabled());
}

IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyInSessionBrowsertest,
                       DeviceLoginScreenDefaultScreenMagnifierType) {
  // Verifies that changing the default screen magnifier type enabled on the
  // login screen through policy does not affect its state in a session.

  // Set the screen magnifier type through device policy and wait for the change
  // to take effect.
  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
  proto.mutable_accessibility_settings()->
      set_login_screen_default_screen_magnifier_type(kFullScreenMagnifier);
  RefreshDevicePolicyAndWaitForPrefChange(prefs::kScreenMagnifierType);

  // Verify that the prefs which control the screen magnifier in the session are
  // unchanged.
  VerifyPrefFollowsDefault(prefs::kScreenMagnifierEnabled);
  VerifyPrefFollowsDefault(prefs::kScreenMagnifierType);

  // Verify that the screen magnifier is disabled.
  chromeos::MagnificationManager* magnification_manager =
      chromeos::MagnificationManager::Get();
  ASSERT_TRUE(magnification_manager);
  EXPECT_FALSE(magnification_manager->IsMagnifierEnabled());
  EXPECT_EQ(ash::kDefaultMagnifierType,
            magnification_manager->GetMagnifierType());
}

} // namespace policy