/*!
 *
 * Copyright (c) 2019-2020 Diality Inc. - All Rights Reserved.
 * \copyright
 * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
 * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
 *
 * \file    CloudSyncController.h
 * \author  (last)      Behrouz NematiPour
 * \author  (original)  Behrouz NematiPour
 * \date    (last)      13-Oct-2021
 * \date    (original)  13-Oct-2021
 *
 */
#pragma once

// Qt
#include <QObject>
#include <QCoreApplication>
#include <QDateTime>

// Project
#include "main.h" // Doxygen : do not remove
#include "GuiController.h"

// define
#define _CloudSyncController CloudSyncController::I()

// forward declarations
class tst_initializations;

// namespace

/*!
 * \brief   The CloudSyncController class
 * \details Singleton class which is the main gateway of CloudSync signal/slots.
 */
class CloudSyncController : public QObject {
    Q_OBJECT

    // Singleton
    SINGLETON(CloudSyncController)

    // friends
    friend class ::tst_initializations;

    QThread *_thread = nullptr;
    bool     _init   = false;

    const int       _interval       = 1000; // 1s
    const QString   _location       = QString(Storage::SDCard_Base_Path_Name) + "cloudsync/";
    const char*     _out_File       = "out.buf"; // The base file name : CloudSync     puts its output                        to this file
    const char*     _inp_File       = "inp.buf"; // The base file name : UI Software   puts the  input data for the CloudSync in this file

    QString         _date_out_File  = ""; // The dated/actual filename : CloudSync     puts its output                        to this file
    QString         _date_inp_File  = ""; // The dated/actual filename : UI Software   puts the  input data for the CloudSync in this file
    QDateTime       _datetime           ;
    qint64          _secSinceEpoch      ;

    QString         _dateFormatted      ;
    QString         _timeFormatted      ;

    const char*     _dateFormat     = "yyyy_MM_dd"  ; // date used in the file name
    const char*     _timeFormat     = "HH:mm:ss.zzz"; // timestamp in the file

    const char      _dateSeparator  = '_'; // used in filename
    const char      _separator      = ',';

    quint64         _seq            =   0;

    enum Errors_Enum {
        eError_OK           ,
        eError_Count        ,
        eError_Timestamp    ,
        eError_Sequence     ,
        eError_MessageID    ,
        eError_ParamCount   ,
        eError_CRC          ,
        eError_Parameter    ,

        eError_NoHistory    ,

        eError_LogFolder    ,
        eError_LogFileInp   ,
    };

    typedef QHash<qint32 , QStringList> MessageList;
    MessageList     _lastReceivedData   ; // sent message history for later send upon request.

    enum Message_Enum {
        eMessage_Timestamp  ,
        eMessage_Sequence   ,
        eMessage_MessageID  ,
        eMessage_ParamCount ,
        eMessage_CRC        ,
        eMessage_Count      ,
    };

    typedef QStringList Params;
    struct Message {
        qint64  timestamp   = 0;
        quint32 sequence    = 0;
        qint32  id          = 0;
        qint64  paramCount  = 0;
        quint8  crc         = 0;
        Params  params      { };
    };

    enum MessageID_Enum {
        eMessageID_DeviceInfo       = 101, // CS asks for device info       and UI sends back
        eMessageID_WriteCredentials = 102, // CS asks to  store credential  and UI stores/confirms
        eMessageID_ReadCredentials  = 103, // CS asks for credentials       and UI reads/sends
        eMessageID_ResetFactory     = 104, // CS asks for factory reset     [no UI ack back yet]

        eMessageID_DeviceState      = 201, // CS asks for device state      and UI finds the history/sends
        eMessageID_PatientID        = 202, // [No CS req defined]               UI sends the patient ID
        eMessageID_TxReport         = 203, // [No CS req defined]               UI sends the Tx report
        eMessageID_DeviceReport     = 204, // [No CS req defined]               UI sends the device report

        eMessageID_HeartBeat        = 900, // CS sends the periodic Hb      and UI can set the interval
    };

protected:
    void timerEvent(QTimerEvent *event) override;

public slots:
    bool init();
    bool init(QThread &vThread);

private slots:
    void quit();

    void onWatchFileChange  (const QString &vFile);
    void onActionReceive    (GuiActionType vAction, const QVariantList &vData);

private:
    void initConnections();

    void initThread(QThread &vThread);
    void quitThread();

    void checkDate          ();
    bool addCSBuffWatch();
    bool sendUIResponse     (const QString &vContent);
    bool sendUIBuff         (const QString &vData);
    bool sendUIHistory      (qint32 vAction);
    bool interpret(const QString &vContent, Message &vMessage);

    QString toText  (Errors_Enum vErrorID);
    QString toInfo  (Errors_Enum vErrorID, const QVariantList &vInfoItems);
    void    toLog   (Errors_Enum vErrorID, const QVariantList &vInfoItems);
};