#ifndef UNIFIED_DCVMC_INTERFACE_H_INCLUDED
#define UNIFIED_DCVMC_INTERFACE_H_INCLUDED

#include <QObject>
#include <QSettings>

#include <QtPlugin>

#include <QSettings>
#include <QString>

#include "ATBAPPplugin.h"

class ATBHMIconfig;
class AppControl;
class ATBSystem;

class UnifiedDCVMCInterface : public QObject, public ATBAPPplugin {

    Q_OBJECT
    Q_INTERFACES(ATBAPPplugin)

public:
    enum class PLUGIN_STATE : quint8 {
        NOT_INITIALIZED = 0,
        INITIALIZED = 1
    };
    enum class RESULT_STATE : quint8 {
        SUCCESS = 1,                // operation was successfull
        ERROR_BACKEND,              // error from backend (e.g. backend replies with error)
        ERROR_TIMEOUT,              // the operation timed out
        ERROR_PROCESS,              // internal plugin error, should not occur (this is a bug in implementation)
        ERROR_RETRY,                // retry operation
        INFO                        // informational (e.g. display a message, log something etc.)
    };
    enum class CASH_STATE   : quint8 {
        CACHE_EMPTY,                // Cache still empty, default state
        CACHE_INPUT,                // Coins are in Cache
        OVERPAYED,
        /* t.b.d. */
    };
    enum class TICKET_VARIANT : quint8 {
        PARKING_TICKET,
        RECEIPT,
        ERROR_RECEIPT,
        START_RECEIPT,   // e.g. Szeged Start
        STOP_RECEIPT,    // e.g. Szeged Stop
    };

    explicit UnifiedDCVMCInterface(QObject *parent = nullptr) : QObject(parent) {}
    virtual ~UnifiedDCVMCInterface() {}

    virtual PLUGIN_STATE initPlugin(QObject *eventReceiver, QSettings const &settings) = 0;

    // mandantory ATBAPP plugin methods:
    virtual PLUGIN_STATE getState() = 0;
    virtual QString getLastError() = 0;
    virtual QString getLastErrorDescription() = 0;

    virtual QString getString(RESULT_STATE resultState) = 0;

public slots:
    virtual void onChangedProgramModeToSELL() = 0;
    virtual void onChangedProgramModeToSERVICE() = 0;
    virtual void onChangedProgramModeToIDLE() = 0;
    virtual void onChangedProgramModeToOOO() = 0;

    virtual void startPhysicalLayer() = 0;
    virtual void stopPhysicalLayer() = 0;
    virtual void reboot() = 0;
    virtual void reset() = 0;

signals:
    void printTicketFinished(RESULT_STATE resultState,
                             const QString & errorCode,
                             const QString & errorDescription);
    void printReceiptFinished(RESULT_STATE resultState,
                              const QString & errorCode,
                              const QString & errorDescription);

    /**
     * emitted on e.g. a coin input
     */
    void cashInputEvent(RESULT_STATE resultState,
                                CASH_STATE cashState,
                                const QString & newCashValue,
                                /* additional variables? */
                                const QString & errorCode,
                                const QString & errorDescription);

    /**
     * emitted if cashInput has been stopped, e.g. in result to task requestStopCashInput():
     *  -> shutter is blocked
     *  -> no cash input is possible
     *  -> coins are in cache
     */
    void cashInputFinished(RESULT_STATE resultState,
                                     const QString & newCashValue,
                                     /*  additional variables? */
                                     const QString & errorCode,
                                     const QString & errorDescription);


    /**
     * emitted e.g. if service door is opened
     */
    void requestModeSERVICE();

    /**
     * emitted e.g. if doors are closed
     */
    void requestModeIDLE();

    /**
     * emitted e.g. on severe errors
     */
    void requestModeOOO();

    /**
     * emitted e.g. if service door is opened
     */
    void requestAccountResponse(const QHash<QString, QVariant> & accountData);

    /**
     * emitted on error
     * depending on errorCode:
     * -> interrupt selling process
     * -> machine can go to state OOO
     * -> send error event to ISMAS
     * -> ...
     */
    void Error(
            /*  additional variables? */
            const QString & errorCode,
            const QString & errorDescription);

};

Q_DECLARE_INTERFACE(UnifiedDCVMCInterface,
                    "eu.atb.ptu.plugin.UnifiedDCVMCInterface/1.0")

using PLUGIN_STATE = UnifiedDCVMCInterface::PLUGIN_STATE;
using RESULT_STATE = UnifiedDCVMCInterface::RESULT_STATE;
using CASH_STATE = UnifiedDCVMCInterface::CASH_STATE;
using TICKET_VARIANT = UnifiedDCVMCInterface::TICKET_VARIANT;

#endif // UNIFIED_DCVMC_INTERFACE_H_INCLUDED