// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SHILL_MANAGER_H_
#define SHILL_MANAGER_H_

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

#include <base/cancelable_callback.h>
#include <base/file_path.h>
#include <base/memory/ref_counted.h>
#include <base/memory/scoped_ptr.h>
#include <base/memory/weak_ptr.h>
#include <chromeos/dbus/service_constants.h>
#include <gtest/gtest_prod.h>  // for FRIEND_TEST

#include "shill/device.h"
#include "shill/device_info.h"
#include "shill/event_dispatcher.h"
#include "shill/hook_table.h"
#include "shill/modem_info.h"
#include "shill/power_manager.h"
#include "shill/property_store.h"
#include "shill/service.h"
#include "shill/vpn_provider.h"
#include "shill/wifi.h"
#include "shill/wimax_provider.h"

namespace shill {

class ControlInterface;
class DBusManager;
class Error;
class EventDispatcher;
class ManagerAdaptorInterface;
class Metrics;

class Manager : public base::SupportsWeakPtr<Manager> {
 public:
  typedef base::Callback<void(const ServiceRefPtr &service)> ServiceCallback;

  struct Properties {
   public:
    Properties()
        : offline_mode(false),
          portal_check_interval_seconds(0),
          arp_gateway(true) {}
    bool offline_mode;
    std::string check_portal_list;
    std::string country;
    int32 portal_check_interval_seconds;
    std::string portal_url;
    std::string host_name;
    // Whether to ARP for the default gateway in the DHCP client after
    // acquiring a lease.
    bool arp_gateway;
    // Comma separated list of technologies on which to use a short DNS
    // timeout to improve performance.
    std::string short_dns_timeout_technologies;
  };

  Manager(ControlInterface *control_interface,
          EventDispatcher *dispatcher,
          Metrics *metrics,
          GLib *glib,
          const std::string &run_directory,
          const std::string &storage_directory,
          const std::string &user_storage_format);
  virtual ~Manager();

  void AddDeviceToBlackList(const std::string &device_name);

  virtual void Start();
  void Stop();

  const ProfileRefPtr &ActiveProfile() const;
  bool IsActiveProfile(const ProfileRefPtr &profile) const;
  bool MoveServiceToProfile(const ServiceRefPtr &to_move,
                            const ProfileRefPtr &destination);
  ProfileRefPtr LookupProfileByRpcIdentifier(const std::string &profile_rpcid);

  // Called via RPC call on Service (|to_set|) to set the "Profile" property.
  void SetProfileForService(const ServiceRefPtr &to_set,
                            const std::string &profile,
                            Error *error);

  virtual void RegisterDevice(const DeviceRefPtr &to_manage);
  virtual void DeregisterDevice(const DeviceRefPtr &to_forget);

  virtual bool HasService(const ServiceRefPtr &service);
  // Register a Service with the Manager. Manager may choose to
  // connect to it immediately.
  virtual void RegisterService(const ServiceRefPtr &to_manage);
  // Deregister a Service from the Manager. Caller is responsible
  // for disconnecting the Service before-hand.
  virtual void DeregisterService(const ServiceRefPtr &to_forget);
  virtual void UpdateService(const ServiceRefPtr &to_update);

  // Persists |to_update| into an appropriate profile.
  virtual void UpdateDevice(const DeviceRefPtr &to_update);

  void FilterByTechnology(Technology::Identifier tech,
                          std::vector<DeviceRefPtr> *found);

  ServiceRefPtr FindService(const std::string& name);
  std::vector<std::string> EnumerateAvailableServices(Error *error);

  // called via RPC (e.g., from ManagerDBusAdaptor)
  ServiceRefPtr GetService(const KeyValueStore &args, Error *error);
  ServiceRefPtr ConfigureService(const KeyValueStore &args, Error *error);

  // Request portal detection checks on each registered device until a portal
  // detection attempt starts on one of them.
  void RecheckPortal(Error *error);
  // Request portal detection be restarted on the device connected to
  // |service|.
  virtual void RecheckPortalOnService(const ServiceRefPtr &service);

  void RequestScan(const std::string &technology, Error *error);
  std::string GetTechnologyOrder();
  void SetTechnologyOrder(const std::string &order, Error *error);
  // Set up the profile list starting with a default profile along with
  // an (optional) list of startup profiles.
  void InitializeProfiles();
  // Create a profile.  This does not affect the profile stack.  Returns
  // the RPC path of the created profile in |path|.
  void CreateProfile(const std::string &name, std::string *path, Error *error);
  // Pushes existing profile with name |name| onto stack of managed profiles.
  // Returns the RPC path of the pushed profile in |path|.
  void PushProfile(const std::string &name, std::string *path, Error *error);
  // Pops profile named |name| off the top of the stack of managed profiles.
  void PopProfile(const std::string &name, Error *error);
  // Remove the active profile.
  void PopAnyProfile(Error *error);
  // Remove the underlying persistent storage for a profile.
  void RemoveProfile(const std::string &name, Error *error);
  // Handle the event where a profile is about to remove a profile entry.
  // Any Services that are dependent on this storage identifier will need
  // to find new profiles.  Return true if any service has been moved to a new
  // profile.  Any such services will have had the profile group removed from
  // the profile.
  virtual bool HandleProfileEntryDeletion(const ProfileRefPtr &profile,
                                          const std::string &entry_name);
  // Find a registered service that contains a GUID property that
  // matches |guid|.
  virtual ServiceRefPtr GetServiceWithGUID(const std::string &guid,
                                           Error *error);
  // Find a service that is both the member of |profile| and has a
  // storage identifier that matches |entry_name|.  This function is
  // called by the Profile in order to return a profile entry's properties.
  virtual ServiceRefPtr GetServiceWithStorageIdentifier(
      const ProfileRefPtr &profile,
      const std::string &entry_name,
      Error *error);
  // Return a reference to the Service associated with the default connection.
  // If there is no such connection, this function returns a reference to NULL.
  virtual ServiceRefPtr GetDefaultService() const;

  // Enable all devices for the named technology.
  void EnableTechnology(const std::string &technology_name,
                        Error *error,
                        const ResultCallback &callback);
  // Disable all devices for the named technology.
  void DisableTechnology(const std::string &technology_name,
                         Error *error,
                         const ResultCallback &callback);
  // Return whether a technology is marked as enabled for portal detection.
  virtual bool IsPortalDetectionEnabled(Technology::Identifier tech);
  // Set the start-up value for the portal detection list.  This list will
  // be used until a value set explicitly over the control API.  Until
  // then, we ignore but do not overwrite whatever value is stored in the
  // profile.
  void SetStartupPortalList(const std::string &portal_list);

  // Return whether a service belongs to the ephemeral profile.
  virtual bool IsServiceEphemeral(const ServiceConstRefPtr &service) const;

  // Return whether a technology is enabled for using short DNS timeouts.
  bool IsTechnologyShortDNSTimeoutEnabled(Technology::Identifier tech) const;

  std::string CalculateState(Error *error);

  virtual int GetPortalCheckInterval() const {
    return props_.portal_check_interval_seconds;
  }
  virtual const std::string &GetPortalCheckURL() const {
    return props_.portal_url;
  }

  DBusManager *dbus_manager() const { return dbus_manager_.get(); }
  virtual DeviceInfo *device_info() { return &device_info_; }
  virtual ModemInfo *modem_info() { return &modem_info_; }
  virtual VPNProvider *vpn_provider() { return &vpn_provider_; }
  virtual WiMaxProvider *wimax_provider() { return &wimax_provider_; }
  PropertyStore *mutable_store() { return &store_; }
  virtual const PropertyStore &store() const { return store_; }
  GLib *glib() const { return glib_; }
  virtual const FilePath &run_path() const { return run_path_; }

  void set_startup_profiles(const std::vector<std::string> &startup_profiles) {
    startup_profiles_ = startup_profiles;
  }
  bool GetArpGateway() const { return props_.arp_gateway; }
  const std::string &GetHostName() const { return props_.host_name; }

  virtual void UpdateEnabledTechnologies();

  // Writes the service |to_update| to persistant storage.  If the service's is
  // ephemeral, it is moved to the current profile.
  void SaveServiceToProfile(const ServiceRefPtr &to_update);

  // Adds a closure to be executed when ChromeOS suspends or shill terminates.
  // |name| should be unique; otherwise, a previous closure by the same name
  // will be replaced.  |start| will be called when RunTerminationActions() is
  // called.  When an action completed, TerminationActionComplete() must be
  // called.
  void AddTerminationAction(const std::string &name,
                            const base::Closure &start);

  // Users call this function to report the completion of an action |name|.
  // This function should be called once for each action.
  void TerminationActionComplete(const std::string &name);

  // Removes the action associtated with |name|.
  void RemoveTerminationAction(const std::string &name);

  // Runs the termination actions.  If all actions complete within |timeout_ms|,
  // |done| is called with a value of Error::kSuccess.  Otherwise, it is called
  // with Error::kOperationTimeout.
  void RunTerminationActions(int timeout_ms,
                             const base::Callback<void(const Error &)> &done);

  // Registers a |callback| that's invoked whenever the default service
  // changes. Returns a unique tag that can be used to deregister the
  // callback. A tag equal to 0 is invalid.
  virtual int RegisterDefaultServiceCallback(const ServiceCallback &callback);
  virtual void DeregisterDefaultServiceCallback(int tag);

 private:
  friend class ManagerAdaptorInterface;
  friend class ManagerTest;
  friend class WiFiObjectTest;
  friend class WiMaxProviderTest;
  FRIEND_TEST(ManagerTest, AvailableTechnologies);
  FRIEND_TEST(ManagerTest, CalculateStateOffline);
  FRIEND_TEST(ManagerTest, CalculateStateOnline);
  FRIEND_TEST(ManagerTest, ConnectedTechnologies);
  FRIEND_TEST(ManagerTest, DefaultTechnology);
  FRIEND_TEST(ManagerTest, DeviceRegistrationAndStart);
  FRIEND_TEST(ManagerTest, DisableTechnology);
  FRIEND_TEST(ManagerTest, EnableTechnology);
  FRIEND_TEST(ManagerTest, EnumerateProfiles);
  FRIEND_TEST(ManagerTest, HandleProfileEntryDeletionWithUnload);
  FRIEND_TEST(ManagerTest, NotifyDefaultServiceChanged);
  FRIEND_TEST(ManagerTest, PopProfileWithUnload);
  FRIEND_TEST(ManagerTest, SortServices);
  FRIEND_TEST(ManagerTest, SortServicesWithConnection);
  FRIEND_TEST(ManagerTest, StartupPortalList);

  static const char kErrorNoDevice[];
  static const char kErrorTypeRequired[];
  static const char kErrorUnsupportedServiceType[];

  WiFiServiceRefPtr GetWifiService(const KeyValueStore &args, Error *error);

  void AutoConnect();
  std::vector<std::string> AvailableTechnologies(Error *error);
  std::vector<std::string> ConnectedTechnologies(Error *error);
  std::string DefaultTechnology(Error *error);
  std::vector<std::string> EnabledTechnologies(Error *error);
  RpcIdentifiers EnumerateDevices(Error *error);
  RpcIdentifiers EnumerateProfiles(Error *error);
  // TODO(cmasone): This should be implemented by filtering |services_|.
  RpcIdentifiers EnumerateWatchedServices(Error *error);
  std::string GetActiveProfileRpcIdentifier(Error *error);
  std::string GetCheckPortalList(Error *error);
  RpcIdentifier GetDefaultServiceRpcIdentifier(Error *error);
  ServiceRefPtr GetServiceInner(const KeyValueStore &args, Error *error);
  void SetCheckPortalList(const std::string &portal_list, Error *error);
  void EmitDefaultService();
  void EmitDeviceProperties();

  // Unload a service while iterating through |services_|.  Returns true if
  // service was erased (which means the caller loop should not increment
  // |service_iterator|), false otherwise (meaning the caller should
  // increment |service_iterator|).
  bool UnloadService(std::vector<ServiceRefPtr>::iterator *service_iterator);

  void HelpRegisterConstDerivedRpcIdentifier(
      const std::string &name,
      RpcIdentifier(Manager::*get)(Error *));
  void HelpRegisterConstDerivedRpcIdentifiers(
      const std::string &name,
      RpcIdentifiers(Manager::*get)(Error *));
  void HelpRegisterDerivedString(
      const std::string &name,
      std::string(Manager::*get)(Error *),
      void(Manager::*set)(const std::string&, Error *));
  void HelpRegisterDerivedStrings(
      const std::string &name,
      Strings(Manager::*get)(Error *),
      void(Manager::*set)(const Strings&, Error *));

  void PopProfileInternal();
  void SortServices();
  void SortServicesTask();
  bool MatchProfileWithService(const ServiceRefPtr &service);

  void NotifyDefaultServiceChanged(const ServiceRefPtr &service);

  void OnPowerStateChanged(PowerManagerProxyDelegate::SuspendState power_state);

  // For unit testing.
  void set_metrics(Metrics *metrics) { metrics_ = metrics; }

  // Used by tests to set a mock PowerManager.  Takes ownership of
  // power_manager.
  void set_power_manager(PowerManager *power_manager) {
    power_manager_.reset(power_manager);
  }

  EventDispatcher *dispatcher_;
  const FilePath run_path_;
  const FilePath storage_path_;
  const std::string user_storage_format_;
  scoped_ptr<ManagerAdaptorInterface> adaptor_;
  scoped_ptr<DBusManager> dbus_manager_;
  DeviceInfo device_info_;
  ModemInfo modem_info_;
  VPNProvider vpn_provider_;
  WiMaxProvider wimax_provider_;
  bool running_;
  // Used to facilitate unit tests which can't use RPC.
  bool connect_profiles_to_rpc_;
  std::vector<DeviceRefPtr> devices_;
  // We store Services in a vector, because we want to keep them sorted.
  // Services that are connected appear first in the vector.  See
  // Service::Compare() for details of the sorting criteria.
  std::vector<ServiceRefPtr> services_;
  // List of startup profile names to push on the profile stack on startup.
  std::vector<std::string> startup_profiles_;
  std::vector<ProfileRefPtr> profiles_;
  ProfileRefPtr ephemeral_profile_;
  ControlInterface *control_interface_;
  Metrics *metrics_;
  GLib *glib_;
  scoped_ptr<PowerManager> power_manager_;

  // The priority order of technologies
  std::vector<Technology::Identifier> technology_order_;

  // This is the last Service RPC Identifier for which we emitted a
  // "DefaultService" signal for.
  RpcIdentifier default_service_rpc_identifier_;

  // Manager can be optionally configured with a list of technologies to
  // do portal detection on at startup.  We need to keep track of that list
  // as well as a flag that tells us whether we should continue using it
  // instead of the configured portal list.
  std::string startup_portal_list_;
  bool use_startup_portal_list_;

  // Properties to be get/set via PropertyStore calls.
  Properties props_;
  PropertyStore store_;

  base::CancelableClosure sort_services_task_;
  HookTable termination_actions_;

  // Maps tags to callbacks for monitoring default service changes.
  std::map<int, ServiceCallback> default_service_callbacks_;
  int default_service_callback_tag_;
};

}  // namespace shill

#endif  // SHILL_MANAGER_H_