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// Copyright (c) 2010 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.

// This class keeps track of the currently-active profiles in the runtime.


#include <map>
#include <string>
#include <vector>

#include "app/system_monitor.h"
#include "base/basictypes.h"
#include "base/file_path.h"
#include "base/message_loop.h"
#include "base/non_thread_safe.h"
#include "base/values.h"
#include "chrome/browser/profile.h"
#include "chrome/common/notification_observer.h"
#include "chrome/common/notification_registrar.h"

// This is a small storage class that simply represents some metadata about
// profiles that are available in the current user data directory.
// These are cached in local state so profiles don't need to be scanned
// for their metadata on every launch.
class AvailableProfile {
  AvailableProfile(const std::wstring& name,
                   const std::wstring& id,
                   const FilePath& directory)
      : name_(name), id_(id), directory_(directory) {}

  // Decodes a DictionaryValue into an AvailableProfile
  static AvailableProfile* FromValue(DictionaryValue* value) {
    std::wstring name, id;
    FilePath::StringType directory;
    value->GetString(L"name", &name);
    value->GetString(L"id", &id);
    value->GetString(L"directory", &directory);
    return new AvailableProfile(name, id, FilePath(directory));

  // Encodes this AvailableProfile into a new DictionaryValue
  DictionaryValue* ToValue() {
    DictionaryValue* value = new DictionaryValue;
    value->SetString(L"name", name_);
    value->SetString(L"id", id_);
    value->SetString(L"directory", directory_.value());
    return value;

  std::wstring name() const { return name_; }
  std::wstring id() const { return id_; }
  FilePath directory() const { return directory_; }

  std::wstring name_;  // User-visible profile name
  std::wstring id_;  // Profile identifier
  FilePath directory_;  // Subdirectory containing profile (not full path)


class ProfileManager : public NonThreadSafe,
                       public SystemMonitor::PowerObserver,
                       public NotificationObserver {
  virtual ~ProfileManager();

  // Invokes ShutdownSessionService() on all profiles.
  static void ShutdownSessionServices();

  // Returns the default profile.  This adds the profile to the
  // ProfileManager if it doesn't already exist.  This method returns NULL if
  // the profile doesn't exist and we can't create it.
  // The profile used can be overridden by using --login-profile on cros.
  Profile* GetDefaultProfile(const FilePath& user_data_dir);

  // Same as instance method but provides the default user_data_dir as well.
  static Profile* GetDefaultProfile();

  // Returns a profile for a specific profile directory within the user data
  // dir. This will return an existing profile it had already been created,
  // otherwise it will create and manage it.
  Profile* GetProfile(const FilePath& profile_dir);

  // Returns a profile for a specific profile directory within the user data
  // dir with the option of controlling whether extensions are initialized
  // or not.  This will return an existing profile it had already been created,
  // otherwise it will create and manage it.
  // Note that if the profile has already been created, extensions may have
  // been initialized.  If this matters to you, you should call GetProfileByPath
  // first to see if the profile already exists.
  Profile* GetProfile(const FilePath& profile_dir, bool init_extensions);

  // Returns the directory where the currently active profile is
  // stored, relative to the user data directory currently in use..
  FilePath GetCurrentProfileDir();

  // These allow iteration through the current list of profiles.
  typedef std::vector<Profile*> ProfileVector;
  typedef ProfileVector::iterator iterator;
  typedef ProfileVector::const_iterator const_iterator;

  iterator begin() { return profiles_.begin(); }
  const_iterator begin() const { return profiles_.begin(); }
  iterator end() { return profiles_.end(); }
  const_iterator end() const { return profiles_.end(); }

  typedef std::vector<AvailableProfile*> AvailableProfileVector;

  // PowerObserver notifications
  void OnSuspend();
  void OnResume();

  // NotificationObserver implementation.
  virtual void Observe(NotificationType type,
                       const NotificationSource& source,
                       const NotificationDetails& details);

  // ------------------ static utility functions -------------------

  // Returns the path to the default profile directory, based on the given
  // user data directory.
  static FilePath GetDefaultProfileDir(const FilePath& user_data_dir);

// Returns the path to the preferences file given the user profile directory.
  static FilePath GetProfilePrefsPath(const FilePath& profile_dir);

  // Tries to determine whether the given path represents a profile
  // directory, and returns true if it thinks it does.
  static bool IsProfile(const FilePath& path);

  // If a profile with the given path is currently managed by this object,
  // return a pointer to the corresponding Profile object;
  // otherwise return NULL.
  Profile* GetProfileByPath(const FilePath& path) const;

  // Creates a new profile at the specified path.
  // This method should always return a valid Profile (i.e., should never
  // return NULL).
  static Profile* CreateProfile(const FilePath& path);

  // Hooks to suspend/resume per-profile network traffic.
  // These must be called on the IO thread.
  static void SuspendProfile(Profile*);
  static void ResumeProfile(Profile*);

  // Adds a pre-existing Profile object to the set managed by this
  // ProfileManager.  This ProfileManager takes ownership of the Profile.
  // The Profile should not already be managed by this ProfileManager.
  // Returns true if the profile was added, false otherwise.
  bool AddProfile(Profile* profile, bool init_extensions);

  // We keep a simple vector of profiles rather than something fancier
  // because we expect there to be a small number of profiles active.
  ProfileVector profiles_;

  AvailableProfileVector available_profiles_;

  NotificationRegistrar registrar_;

  // Indicates that a user has logged in and that the profile specified
  // in the --login-profile command line argument should be used as the
  // default.
  bool logged_in_;



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