/*******************************************************************************
  Copyright(c) 2017 Jasem Mutlaq. All rights reserved.

 Connection Plugin Interface

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Library General Public
 License version 2 as published by the Free Software Foundation.

 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Library General Public License for more details.

 You should have received a copy of the GNU Library General Public License
 along with this library; see the file COPYING.LIB.  If not, write to
 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 Boston, MA 02110-1301, USA.
*******************************************************************************/

#pragma once

#include "indidevapi.h"

#include <functional>
#include <string>

namespace INDI
{
class DefaultDevice;
}

/**
 * @namespace Connection
 * @brief Combines all INDI Connection Plugins. Each INDI connection plugin is responsible of managing communications
 * with a specific physical or logical medium (e.g. serial or ethernet).
 */
namespace Connection
{
/**
 * @brief The Interface class is the base class for all INDI connection plugins.
 *
 * Each plugin implements the connection details specific to a particular medium (e.g. serial). After the connection to the medium is successful, a <i>handshake</i> is
 * initialted to make sure the device is online and responding to commands. The child class employing the plugin must register
 * the handshake to perform the actual low-level communication with the device.
 *
 * @see Connection::Serial
 * @see Connection::TCP
 * @see INDI::Telescope utilizes both serial and tcp plugins to communicate with mounts.
 */
class Interface
{
    public:
        /**
         * \struct Type
         * \brief Holds the connection type
         */
        typedef enum
        {
            CONNECTION_NONE   = 1 << 0, /** Do not use any connection plugin */
            CONNECTION_SERIAL = 1 << 1, /** For regular serial and bluetooth connections */
            CONNECTION_TCP    = 1 << 2,  /** For Wired and WiFI connections */
            CONNECTION_USB    = 1 << 3,  /** For USB-based connections */
            CONNECTION_I2C    = 1 << 4,  /** For I2C-based connections (Linux Only) */
            CONNECTION_CUSTOM = 1 << 15, /** Custom connection */
        } Type;

        /**
         * @brief Connect Connect to device via the implemented communication medium. Do not perform any handshakes.
         * @return True if successful, false otherwise.
         */
        virtual bool Connect() = 0;

        /**
         * @brief Disconnect Disconnect from device.
         * @return True if successful, false otherwise.
         */
        virtual bool Disconnect() = 0;

        /**
         * @brief Activated Function called by the framework when the plugin is activated (i.e. selected by the user). It is usually used to define properties
         * pertaining to the specific plugin functionalities.
         */
        virtual void Activated() = 0;

        /**
         * @brief Deactivated Function called by the framework when the plugin is deactivated. It is usually used to delete properties by were defined
         * previously since the plugin is no longer active.
         */
        virtual void Deactivated() = 0;

        /**
         * @return Plugin name
         */
        virtual std::string name() = 0;

        /**
         * @return Plugin friendly label presented to the client/user.
         */
        virtual std::string label() = 0;

        /**
         * @brief type Return connection type
         * @return connection type
         */
        virtual Type type()
        {
            return m_Type;
        }

        virtual bool ISNewSwitch(const char *dev, const char *name, ISState *states, char *names[], int n);
        virtual bool ISNewNumber(const char *dev, const char *name, double values[], char *names[], int n);
        virtual bool ISNewText(const char *dev, const char *name, char *texts[], char *names[], int n);
        virtual bool ISNewBLOB(const char *dev, const char *name, int sizes[], int blobsizes[], char *blobs[],
                               char *formats[], char *names[], int n);
        virtual bool saveConfigItems(FILE *fp);

        /**
         * @brief registerHandshake Register a handshake function to be called once the initial connection to the device is established.
         * @param callback Handshake function callback
         * @see INDI::Telescope
         */
        void registerHandshake(std::function<bool()> callback);

    protected:
        Interface(INDI::DefaultDevice *dev, Type type = CONNECTION_NONE);
        virtual ~Interface();

        const char *getDeviceName();
        std::function<bool()> Handshake;
        INDI::DefaultDevice *m_Device {  nullptr };
        Type m_Type { CONNECTION_NONE };
};
}
