/*
 *  Copyright (C) 2005-2024 Team Kodi
 *  This file is part of Kodi - https://kodi.tv
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 *  See LICENSES/README.md for more information.
 */

#pragma once

#include "bus/PeripheralBus.h"
#include "devices/Peripheral.h"
#include "guilib/IMsgTargetCallback.h"
#include "interfaces/IAnnouncer.h"
#include "messaging/IMessageTarget.h"
#include "peripherals/events/interfaces/IEventScannerCallback.h"
#include "settings/lib/ISettingCallback.h"
#include "threads/CriticalSection.h"
#include "threads/Thread.h"
#include "utils/Observer.h"

#include <atomic>
#include <memory>
#include <vector>

class CFileItemList;
class CInputManager;
class CSetting;
class CSettingsCategory;
class CAction;
class CKey;
class CEvent;

namespace tinyxml2
{
class XMLElement;
}

namespace KODI
{
namespace GAME
{
class CControllerManager;
}

namespace JOYSTICK
{
class IButtonMapper;
}
} // namespace KODI

namespace PERIPHERALS
{
class CEventScanner;

/*!
 * \ingroup peripherals
 */
class CPeripherals : public ISettingCallback,
                     public Observable,
                     public KODI::MESSAGING::IMessageTarget,
                     public IEventScannerCallback,
                     public ANNOUNCEMENT::IAnnouncer,
                     public IMsgTargetCallback
{
public:
  explicit CPeripherals(CInputManager& inputManager,
                        KODI::GAME::CControllerManager& controllerProfiles);

  ~CPeripherals() override;

  /*!
   * @brief Initialise the peripherals manager.
   */
  void Initialise();

  /*!
   * @brief Clear all data known by the peripherals manager.
   */
  void Clear();

  /*!
   * @brief Get the instance of the peripheral at the given location.
   * @param strLocation The location.
   * @param busType The bus to query. Default (PERIPHERAL_BUS_UNKNOWN) searches all busses.
   * @return The peripheral or NULL if it wasn't found.
   */
  PeripheralPtr GetPeripheralAtLocation(const std::string& strLocation,
                                        PeripheralBusType busType = PERIPHERAL_BUS_UNKNOWN) const;

  /*!
   * @brief Check whether a peripheral is present at the given location.
   * @param strLocation The location.
   * @param busType The bus to query. Default (PERIPHERAL_BUS_UNKNOWN) searches all busses.
   * @return True when a peripheral was found, false otherwise.
   */
  bool HasPeripheralAtLocation(const std::string& strLocation,
                               PeripheralBusType busType = PERIPHERAL_BUS_UNKNOWN) const;

  /*!
   * @brief Get the bus that holds the device with the given location.
   * @param strLocation The location.
   * @return The bus or NULL if no device was found.
   */
  PeripheralBusPtr GetBusWithDevice(const std::string& strLocation) const;

  /*!
   * @brief Check if any busses support the given feature
   * @param feature The feature to check for
   * @return True if a bus supports the feature, false otherwise
   */
  bool SupportsFeature(PeripheralFeature feature) const;

  /*!
   * @brief Get all peripheral instances that have the given feature.
   * @param results The list of results.
   * @param feature The feature to search for.
   * @param busType The bus to query. Default (PERIPHERAL_BUS_UNKNOWN) searches all busses.
   * @return The number of devices that have been found.
   */
  int GetPeripheralsWithFeature(PeripheralVector& results,
                                const PeripheralFeature feature,
                                PeripheralBusType busType = PERIPHERAL_BUS_UNKNOWN) const;

  size_t GetNumberOfPeripherals() const;

  /*!
   * @brief Check whether there is at least one device present with the given feature.
   * @param feature The feature to check for.
   * @param busType The bus to query. Default (PERIPHERAL_BUS_UNKNOWN) searches all busses.
   * @return True when at least one device was found with this feature, false otherwise.
   */
  bool HasPeripheralWithFeature(const PeripheralFeature feature,
                                PeripheralBusType busType = PERIPHERAL_BUS_UNKNOWN) const;

  /*!
   * @brief Called when a device has been added to a bus.
   * @param bus The bus the device was added to.
   * @param peripheral The peripheral that has been added.
   */
  void OnDeviceAdded(const CPeripheralBus& bus, const CPeripheral& peripheral);

  /*!
   * @brief Called when a device has been deleted from a bus.
   * @param bus The bus from which the device removed.
   * @param peripheral The peripheral that has been removed.
   */
  void OnDeviceDeleted(const CPeripheralBus& bus, const CPeripheral& peripheral);

  /*!
   * @brief Creates a new instance of a peripheral.
   * @param bus The bus on which this peripheral is present.
   * @param result The scan result from the device scanning code.
   * @return The new peripheral or NULL if it could not be created.
   */
  void CreatePeripheral(CPeripheralBus& bus, const PeripheralScanResult& result);

  /*!
   * @brief Add the settings that are defined in the mappings file to the peripheral (if there is
   * anything defined).
   * @param peripheral The peripheral to get the settings for.
   */
  void GetSettingsFromMapping(CPeripheral& peripheral) const;

  /*!
   * @brief Trigger a device scan on all known busses
   */
  void TriggerDeviceScan(const PeripheralBusType type = PERIPHERAL_BUS_UNKNOWN);

  /*!
   * @brief Get the instance of a bus given it's type.
   * @param type The bus type.
   * @return The bus or NULL if it wasn't found.
   */
  PeripheralBusPtr GetBusByType(const PeripheralBusType type) const;

  /*!
   * @brief Get all fileitems for a path.
   * @param strPath The path to the directory to get the items from.
   * @param items The item list.
   */
  void GetDirectory(const std::string& strPath, CFileItemList& items) const;

  /*!
   * @brief Get the instance of a peripheral given it's path.
   * @param strPath The path to the peripheral.
   * @return The peripheral or NULL if it wasn't found.
   */
  PeripheralPtr GetByPath(const std::string& strPath) const;

  /*!
   * @brief Try to let one of the peripherals handle an action.
   * @param action The change to handle.
   * @return True when this change was handled by a peripheral (and should not be handled by
   * anything else), false otherwise.
   */
  bool OnAction(const CAction& action);

  /*!
   * @brief Check whether there's a peripheral that reports to be muted.
   * @return True when at least one peripheral reports to be muted, false otherwise.
   */
  bool IsMuted();

  /*!
   * @brief Try to toggle the mute status via a peripheral.
   * @return True when this change was handled by a peripheral (and should not be handled by
   * anything else), false otherwise.
   */
  bool ToggleMute();

  /*!
   * @brief Try to toggle the playing device state via a peripheral.
   * @param mode Whether to activate, put on standby or toggle the source.
   * @return True when the playing device has been switched on, false otherwise.
   */
  bool ToggleDeviceState(const CecStateChange mode = STATE_SWITCH_TOGGLE);

  /*!
   * @brief Try to mute the audio via a peripheral.
   * @return True when this change was handled by a peripheral (and should not be handled by
   * anything else), false otherwise.
   */
  bool Mute()
  {
    return ToggleMute();
  } //! @todo CEC only supports toggling the mute status at this time

  /*!
   * @brief Try to unmute the audio via a peripheral.
   * @return True when this change was handled by a peripheral (and should not be handled by
   * anything else), false otherwise.
   */
  bool UnMute()
  {
    return ToggleMute();
  } //! @todo CEC only supports toggling the mute status at this time

  /*!
   * @brief Try to get a keypress from a peripheral.
   * @param frameTime The current frametime.
   * @param key The fetched key.
   * @return True when a keypress was fetched, false otherwise.
   */
  bool GetNextKeypress(float frameTime, CKey& key);

  /*!
   * @brief Register with the event scanner to control scan timing
   * @return A handle that unregisters itself when expired
   */
  EventPollHandlePtr RegisterEventPoller();

  /*!
   * @brief Register with the event scanner to disable event processing
   * @return A handle that unregisters itself when expired
   */
  EventLockHandlePtr RegisterEventLock();

  /*!
   *
   */
  void OnUserNotification();

  /*!
   * @brief Request peripherals with the specified feature to perform a quick test
   * @return true if any peripherals support the feature, false otherwise
   */
  void TestFeature(PeripheralFeature feature);

  /*!
   * \brief Request all devices with power-off support to power down
   */
  void PowerOffDevices();

  bool SupportsCEC() const
  {
#if defined(HAVE_LIBCEC)
    return true;
#else
    return false;
#endif
  }

  // implementation of IEventScannerCallback
  void ProcessEvents(void) override;

  /*!
   * \brief Initialize button mapping
   *
   * This command enables button mapping on all busses. Button maps allow
   * connect events from the driver to the higher-level features used by
   * controller profiles.
   *
   * If user input is required, a blocking dialog may be shown.
   */
  void EnableButtonMapping();

  /*!
   * \brief Get an add-on that can provide button maps for a device
   * \return An add-on that provides button maps, or empty if no add-on is found
   */
  PeripheralAddonPtr GetAddonWithButtonMap(const CPeripheral* device);

  /*!
   * \brief Reset all button maps to the defaults for all devices and the given controller
   * \param controllerId The controller profile to reset
   * @todo Add a device parameter to allow resetting button maps per-device
   */
  void ResetButtonMaps(const std::string& controllerId);

  /*!
   * \brief Register a button mapper interface
   * \param mapper The button mapper
   *
   * Clients implementing the IButtonMapper interface call
   * \ref CPeripherals::RegisterJoystickButtonMapper to register themselves
   * as eligible for button mapping commands.
   *
   * When registering the mapper is forwarded to all peripherals. See
   * \ref CPeripheral::RegisterJoystickButtonMapper for what is done to the
   * mapper after being given to the peripheral.
   */
  void RegisterJoystickButtonMapper(KODI::JOYSTICK::IButtonMapper* mapper);

  /*!
   * \brief Unregister a button mapper interface
   * \param mapper The button mapper
   */
  void UnregisterJoystickButtonMapper(KODI::JOYSTICK::IButtonMapper* mapper);

  // implementation of ISettingCallback
  void OnSettingChanged(const std::shared_ptr<const CSetting>& setting) override;
  void OnSettingAction(const std::shared_ptr<const CSetting>& setting) override;

  // implementation of IMessageTarget
  void OnApplicationMessage(KODI::MESSAGING::ThreadMessage* pMsg) override;
  int GetMessageMask() override;

  // implementation of IAnnouncer
  void Announce(ANNOUNCEMENT::AnnouncementFlag flag,
                const std::string& sender,
                const std::string& message,
                const CVariant& data) override;

  // Implementation of IMsgTargetCallback
  bool OnMessage(CGUIMessage& message) override;

  /*!
   * \brief Access the input manager passed to the constructor
   */
  CInputManager& GetInputManager()
  {
    return m_inputManager;
  }

  /*!
   * \brief Access controller profiles through the construction parameter
   */
  KODI::GAME::CControllerManager& GetControllerProfiles()
  {
    return m_controllerProfiles;
  }

  /*!
   * \brief Get a mutex that allows for add-on install tasks to block on each other
   */
  CCriticalSection& GetAddonInstallMutex()
  {
    return m_addonInstallMutex;
  }

  // GUI functions
  bool WaitForGUI();

private:
  bool LoadMappings();
  bool GetMappingForDevice(const CPeripheralBus& bus, PeripheralScanResult& result) const;
  static void GetSettingsFromMappingsFile(
      tinyxml2::XMLElement* xmlNode, std::map<std::string, PeripheralDeviceSetting>& m_settings);

  void OnDeviceChanged();

  // Construction parameters
  CInputManager& m_inputManager;
  KODI::GAME::CControllerManager& m_controllerProfiles;

#if !defined(HAVE_LIBCEC)
  bool m_bMissingLibCecWarningDisplayed = false;
#endif
  std::vector<PeripheralBusPtr> m_busses;
  std::vector<PeripheralDeviceMapping> m_mappings;
  std::unique_ptr<CEventScanner> m_eventScanner;
  mutable CCriticalSection m_critSectionBusses;
  mutable CCriticalSection m_critSectionMappings;
  CCriticalSection m_addonInstallMutex;
  std::atomic<bool> m_guiReady{false};
  std::unique_ptr<CEvent> m_guiReadyEvent;
};
} // namespace PERIPHERALS
