// Copyright 2014 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.

#ifndef CHROMEOS_PAIRING_FAKE_CONTROLLER_PAIRING_FLOW_H_
#define CHROMEOS_PAIRING_FAKE_CONTROLLER_PAIRING_FLOW_H_

#include <set>
#include <utility>

#include "base/macros.h"
#include "base/observer_list.h"
#include "base/time/time.h"
#include "chromeos/chromeos_export.h"
#include "chromeos/pairing/controller_pairing_flow.h"

namespace chromeos {

class CHROMEOS_EXPORT FakeControllerPairingFlow
    : public ControllerPairingFlow,
      public ControllerPairingFlow::Observer {
 public:
  typedef ControllerPairingFlow::Observer Observer;

  enum DiscoveryEventType { DEVICE_FOUND, DEVICE_LOST, NOTHING_FOUND };

  typedef std::pair<DiscoveryEventType, std::string> DiscoveryEvent;
  typedef std::vector<DiscoveryEvent> DiscoveryScenario;

  // Config is a coma separated list of key-value pairs separated by colon.
  // Supported options:
  // * async_duration - integer. Default: 3000.
  // * fail_connecting - {0,1}. Default: 0.
  // * connection_lost - integer-integer. Default: 0-0.
  // * fail_enrollment - {0,1}. Default: 0.
  // * discovery - {F,L,N}-string(~{F,L,N}-string)*. Default:
  //   F-Device_1~F-Device_5~F-Device_3~L-Device_3~L-Device_1~F-Device_1
  // * code - 6 digits or empty string. Default: empty string. If strings is
  // empty, random code is generated.
  FakeControllerPairingFlow(const std::string& config);
  virtual ~FakeControllerPairingFlow();

  // Applies given |config| to flow.
  void ApplyConfig(const std::string& config);

  // Sets delay for asynchronous operations. like device searching or host
  // enrollment. Default value is 3 seconds.
  void set_async_duration(base::TimeDelta async_duration) {
    async_duration_ = async_duration;
  }

  // Causing an error on |STAGE_ESTABLISHING_CONNECTION| stage once.
  void SetShouldFailOnConnecting();

  // Causing a connection loss on |stage_begin| and a connection recovery
  // on |stage_end| once.
  void SetShouldLoseConnection(Stage stage_begin, Stage stage_end);

  // Makes host enrollment to fail once.
  void SetEnrollmentShouldFail();

  // Sets devices discovery scenario for |STAGE_DEVICES_DESCOVERY| stage.
  // Events are executed with interval of |async_duration_|.
  // For default scenario refer to implementation.
  void SetDiscoveryScenario(const DiscoveryScenario& discovery_scenario);

  // Overridden from ControllerPairingFlow:
  virtual void AddObserver(Observer* observer) OVERRIDE;
  virtual void RemoveObserver(Observer* observer) OVERRIDE;
  virtual Stage GetCurrentStage() OVERRIDE;
  virtual void StartFlow() OVERRIDE;
  virtual DeviceIdList GetDiscoveredDevices() OVERRIDE;
  virtual void ChooseDeviceForPairing(const std::string& device_id) OVERRIDE;
  virtual void RepeatDiscovery() OVERRIDE;
  virtual std::string GetConfirmationCode() OVERRIDE;
  virtual void SetConfirmationCodeIsCorrect(bool correct) OVERRIDE;
  virtual void OnAuthenticationDone(
      const chromeos::UserContext& user_context,
      content::BrowserContext* browser_context) OVERRIDE;
  virtual void StartSession() OVERRIDE;

 private:
  void ChangeStage(Stage new_stage);
  void ChangeStageLater(Stage new_stage);
  void ExecuteDiscoveryEvent(size_t event_position);
  void DeviceFound(const std::string& device_id);
  void DeviceLost(const std::string& device_id);

  // Overridden from ui::ControllerPairingFlow::Observer:
  virtual void PairingStageChanged(Stage new_stage) OVERRIDE;
  virtual void DiscoveredDevicesListChanged() OVERRIDE;

  ObserverList<ControllerPairingFlow::Observer> observers_;
  Stage current_stage_;
  std::string confirmation_code_;
  std::string preset_confirmation_code_;
  base::TimeDelta async_duration_;
  DiscoveryScenario discovery_scenario_;
  std::set<std::string> discovered_devices_;
  std::string choosen_device_;
  bool should_fail_on_connecting_;
  Stage connection_lost_begin_;
  Stage connection_lost_end_;
  bool enrollment_should_fail_;

  DISALLOW_COPY_AND_ASSIGN(FakeControllerPairingFlow);
};

}  // namespace chromeos

#endif  // CHROMEOS_PAIRING_FAKE_CONTROLLER_PAIRING_FLOW_H_