// 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 "chrome/browser/ui/startup/default_browser_prompt.h"

#include "base/location.h"
#include "base/memory/weak_ptr.h"
#include "base/metrics/histogram.h"
#include "base/prefs/pref_registry_simple.h"
#include "base/prefs/pref_service.h"
#include "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "base/version.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/first_run/first_run.h"
#include "chrome/browser/infobars/infobar_service.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/browser/shell_integration.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "chrome/common/chrome_version_info.h"
#include "chrome/common/pref_names.h"
#include "chrome/grit/chromium_strings.h"
#include "chrome/grit/generated_resources.h"
#include "chrome/installer/util/master_preferences.h"
#include "chrome/installer/util/master_preferences_constants.h"
#include "components/infobars/core/confirm_infobar_delegate.h"
#include "components/infobars/core/infobar.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/navigation_details.h"
#include "content/public/browser/web_contents.h"
#include "grit/theme_resources.h"
#include "ui/base/l10n/l10n_util.h"


namespace {

// Calls the appropriate function for setting Chrome as the default browser.
// This requires IO access (registry) and may result in interaction with a
// modal system UI.
void SetChromeAsDefaultBrowser(bool interactive_flow, PrefService* prefs) {
  if (interactive_flow) {
    UMA_HISTOGRAM_COUNTS("DefaultBrowserWarning.SetAsDefaultUI", 1);
    if (!ShellIntegration::SetAsDefaultBrowserInteractive()) {
      UMA_HISTOGRAM_COUNTS("DefaultBrowserWarning.SetAsDefaultUIFailed", 1);
    } else if (ShellIntegration::GetDefaultBrowser() ==
               ShellIntegration::NOT_DEFAULT) {
      // If the interaction succeeded but we are still not the default browser
      // it likely means the user simply selected another browser from the
      // panel. We will respect this choice and write it down as 'no, thanks'.
      UMA_HISTOGRAM_COUNTS("DefaultBrowserWarning.DontSetAsDefault", 1);
    }
  } else {
    UMA_HISTOGRAM_COUNTS("DefaultBrowserWarning.SetAsDefault", 1);
    ShellIntegration::SetAsDefaultBrowser();
  }
}

// The delegate for the infobar shown when Chrome is not the default browser.
class DefaultBrowserInfoBarDelegate : public ConfirmInfoBarDelegate {
 public:
  // Creates a default browser infobar and delegate and adds the infobar to
  // |infobar_service|.
  static void Create(InfoBarService* infobar_service,
                     PrefService* prefs,
                     bool interactive_flow_required);

 private:
  DefaultBrowserInfoBarDelegate(PrefService* prefs,
                                bool interactive_flow_required);
  ~DefaultBrowserInfoBarDelegate() override;

  void AllowExpiry() { should_expire_ = true; }

  // ConfirmInfoBarDelegate:
  int GetIconID() const override;
  bool ShouldExpire(const NavigationDetails& details) const override;
  base::string16 GetMessageText() const override;
  base::string16 GetButtonLabel(InfoBarButton button) const override;
  bool OKButtonTriggersUACPrompt() const override;
  bool Accept() override;
  bool Cancel() override;

  // The prefs to use.
  PrefService* prefs_;

  // Whether the user clicked one of the buttons.
  bool action_taken_;

  // Whether the info-bar should be dismissed on the next navigation.
  bool should_expire_;

  // Whether changing the default application will require entering the
  // modal-UI flow.
  const bool interactive_flow_required_;

  // Used to delay the expiration of the info-bar.
  base::WeakPtrFactory<DefaultBrowserInfoBarDelegate> weak_factory_;

  DISALLOW_COPY_AND_ASSIGN(DefaultBrowserInfoBarDelegate);
};

// static
void DefaultBrowserInfoBarDelegate::Create(InfoBarService* infobar_service,
                                           PrefService* prefs,
                                           bool interactive_flow_required) {
  infobar_service->AddInfoBar(infobar_service->CreateConfirmInfoBar(
      scoped_ptr<ConfirmInfoBarDelegate>(new DefaultBrowserInfoBarDelegate(
          prefs, interactive_flow_required))));
}

DefaultBrowserInfoBarDelegate::DefaultBrowserInfoBarDelegate(
    PrefService* prefs,
    bool interactive_flow_required)
    : ConfirmInfoBarDelegate(),
      prefs_(prefs),
      action_taken_(false),
      should_expire_(false),
      interactive_flow_required_(interactive_flow_required),
      weak_factory_(this) {
  // We want the info-bar to stick-around for few seconds and then be hidden
  // on the next navigation after that.
  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
      FROM_HERE, base::Bind(&DefaultBrowserInfoBarDelegate::AllowExpiry,
                            weak_factory_.GetWeakPtr()),
      base::TimeDelta::FromSeconds(8));
}

DefaultBrowserInfoBarDelegate::~DefaultBrowserInfoBarDelegate() {
  if (!action_taken_)
    UMA_HISTOGRAM_COUNTS("DefaultBrowserWarning.Ignored", 1);
}

int DefaultBrowserInfoBarDelegate::GetIconID() const {
  return IDR_PRODUCT_LOGO_32;
}

bool DefaultBrowserInfoBarDelegate::ShouldExpire(
    const NavigationDetails& details) const {
  return should_expire_ && ConfirmInfoBarDelegate::ShouldExpire(details);
}

base::string16 DefaultBrowserInfoBarDelegate::GetMessageText() const {
  return l10n_util::GetStringUTF16(IDS_DEFAULT_BROWSER_INFOBAR_SHORT_TEXT);
}

base::string16 DefaultBrowserInfoBarDelegate::GetButtonLabel(
    InfoBarButton button) const {
  return l10n_util::GetStringUTF16((button == BUTTON_OK) ?
      IDS_SET_AS_DEFAULT_INFOBAR_BUTTON_LABEL :
      IDS_DONT_ASK_AGAIN_INFOBAR_BUTTON_LABEL);
}

bool DefaultBrowserInfoBarDelegate::OKButtonTriggersUACPrompt() const {
  return true;
}

bool DefaultBrowserInfoBarDelegate::Accept() {
  action_taken_ = true;
  content::BrowserThread::PostTask(
      content::BrowserThread::FILE, FROM_HERE,
      base::Bind(&SetChromeAsDefaultBrowser, interactive_flow_required_,
                 prefs_));

  return true;
}

bool DefaultBrowserInfoBarDelegate::Cancel() {
  action_taken_ = true;
  UMA_HISTOGRAM_COUNTS("DefaultBrowserWarning.DontSetAsDefault", 1);
  // User clicked "Don't ask me again", remember that.
  prefs_->SetBoolean(prefs::kCheckDefaultBrowser, false);
  return true;
}

void NotifyNotDefaultBrowserCallback(chrome::HostDesktopType desktop_type) {
  Browser* browser = chrome::FindLastActiveWithHostDesktopType(desktop_type);
  if (!browser)
    return;  // Reached during ui tests.

  // In ChromeBot tests, there might be a race. This line appears to get
  // called during shutdown and |tab| can be NULL.
  content::WebContents* web_contents =
      browser->tab_strip_model()->GetActiveWebContents();
  if (!web_contents)
    return;

  DefaultBrowserInfoBarDelegate::Create(
      InfoBarService::FromWebContents(web_contents),
      Profile::FromBrowserContext(
          web_contents->GetBrowserContext())->GetPrefs(),
      (ShellIntegration::CanSetAsDefaultBrowser() ==
          ShellIntegration::SET_DEFAULT_INTERACTIVE));
}

void ResetCheckDefaultBrowserPrefOnUIThread(
    const base::FilePath& profile_path) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  Profile* profile =
      g_browser_process->profile_manager()->GetProfileByPath(profile_path);
  if (profile)
    profile->GetPrefs()->SetBoolean(prefs::kCheckDefaultBrowser, true);
}

void CheckDefaultBrowserOnFileThread(const base::FilePath& profile_path,
                                     bool show_prompt,
                                     chrome::HostDesktopType desktop_type) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::FILE);
  ShellIntegration::DefaultWebClientState state =
      ShellIntegration::GetDefaultBrowser();
  if (state == ShellIntegration::IS_DEFAULT) {
    // Notify the user in the future if Chrome ceases to be the user's chosen
    // default browser.
    content::BrowserThread::PostTask(
        content::BrowserThread::UI, FROM_HERE,
        base::Bind(&ResetCheckDefaultBrowserPrefOnUIThread, profile_path));
  } else if (show_prompt && state == ShellIntegration::NOT_DEFAULT) {
    ShellIntegration::DefaultWebClientSetPermission default_change_mode =
        ShellIntegration::CanSetAsDefaultBrowser();

    if (default_change_mode != ShellIntegration::SET_DEFAULT_NOT_ALLOWED) {
      content::BrowserThread::PostTask(
          content::BrowserThread::UI, FROM_HERE,
          base::Bind(&NotifyNotDefaultBrowserCallback, desktop_type));
    }
  }
}

}  // namespace

namespace chrome {

void RegisterDefaultBrowserPromptPrefs(PrefRegistrySimple* registry) {
  registry->RegisterStringPref(
      prefs::kBrowserSuppressDefaultBrowserPrompt, std::string());
}

void ShowDefaultBrowserPrompt(Profile* profile, HostDesktopType desktop_type) {
  // We do not check if we are the default browser if:
  // - There is a policy in control of this setting.
  // We check if we are the default browser but do not prompt if:
  // - The user said "don't ask me again" on the infobar earlier.
  // - The "suppress_default_browser_prompt_for_version" master preference is
  //     set to the current version.
  bool show_prompt =
      profile->GetPrefs()->GetBoolean(prefs::kCheckDefaultBrowser);

  if (g_browser_process->local_state()->IsManagedPreference(
      prefs::kDefaultBrowserSettingEnabled)) {
    if (g_browser_process->local_state()->GetBoolean(
        prefs::kDefaultBrowserSettingEnabled)) {
      content::BrowserThread::PostTask(
          content::BrowserThread::FILE, FROM_HERE,
          base::Bind(
              base::IgnoreResult(&ShellIntegration::SetAsDefaultBrowser)));
    } else {
      // TODO(pastarmovj): We can't really do anything meaningful here yet but
      // just prevent showing the infobar.
    }
    return;
  }

  if (show_prompt) {
    const std::string disable_version_string =
        g_browser_process->local_state()->GetString(
            prefs::kBrowserSuppressDefaultBrowserPrompt);
    const Version disable_version(disable_version_string);
    DCHECK(disable_version_string.empty() || disable_version.IsValid());
    if (disable_version.IsValid()) {
      const chrome::VersionInfo version_info;
      if (disable_version.Equals(Version(version_info.Version())))
        show_prompt = false;
    }
  }

  content::BrowserThread::PostTask(
      content::BrowserThread::FILE, FROM_HERE,
      base::Bind(&CheckDefaultBrowserOnFileThread, profile->GetPath(),
                 show_prompt, desktop_type));
}

#if !defined(OS_WIN)
bool ShowFirstRunDefaultBrowserPrompt(Profile* profile) {
  return false;
}
#endif

}  // namespace chrome