#ifndef DATARECEIVER_H
#define DATARECEIVER_H

#include <QObject>
#include <QUdpSocket>
#include <QTimer>
#include <QThread>
#include <QSemaphore>

#include "cbuffer.h"

#define DATA_PACKET_HEADER_SIZE     6
#define DATA_SYNC_HEADER_SIZE       6
#define DATA_BYTES_PER_SAMPLE       2
#define DATA_SAMPLES_PER_SENSOR     64
#define DATA_MAX_SENSORS_PER_BOARD  5
#define DATA_MAX_BUNCH              16  //max. product of dmaBunch * ethBunch

//#define DATA_BLOCK_SIZE             (DATA_SENSORS_PER_BOARD * DATA_SAMPLES_PER_SENSOR * DATA_BYTES_PER_SAMPLE)
#define DATA_BLOCK_SIZE             (sensorsPerBoard * DATA_SAMPLES_PER_SENSOR * DATA_BYTES_PER_SAMPLE)
#define DATA_PACKET_SIZE            ( DATA_MAX_BUNCH * (DATA_PACKET_HEADER_SIZE + DATA_SYNC_HEADER_SIZE + DATA_BLOCK_SIZE ) )

#define DATA_MAX_BLOCK_SIZE         (DATA_MAX_SENSORS_PER_BOARD * DATA_SAMPLES_PER_SENSOR * DATA_BYTES_PER_SAMPLE)
#define DATA_MAX_PACKET_SIZE        ( DATA_MAX_BUNCH * (DATA_PACKET_HEADER_SIZE + DATA_SYNC_HEADER_SIZE + DATA_MAX_BLOCK_SIZE ) )

#define RECEIVER_BUFFER_SIZE        10000

#define RECEIVER_TIMER_PERIOD_MS    200 //The period of the timer to measure data rate. The measurement is always properly scaled.
#define RECEIVER_FRAMES_PER_SIG     100 //The DataReady signal is transmitted only every N frames, not to overload queued signals framework.

typedef struct
{
    //unsigned short channel_id;
    unsigned short local_ctr;
    unsigned short global_ctr;
    unsigned short sma_state;
        //these files are additional compared to STM side
    unsigned short dummy = 0xFFFF;  //for nice structure packing
    int device_nr;
    int data_ok;
} SyncFrame;

class BufferData
{
public:
    SyncFrame sync_frame;
    int buffer_size;
    unsigned short* sensor_data;

    BufferData() : buffer_size(0), sensor_data(NULL) {}

    BufferData(int size) : buffer_size(0), sensor_data(NULL)
    {
        resize(size);
    }

    void resize(int size)
    {
        if (size == buffer_size)
            return;         //no need to change
        if (sensor_data)
        {
            delete[] sensor_data;
            sensor_data = NULL;
        }
        buffer_size = size;
        if (size)           //do not allocate memory for an empty buffer
            sensor_data = new unsigned short[size];
    }

    BufferData(const BufferData& master) : buffer_size(0), sensor_data(NULL)
    {
        sync_frame = master.sync_frame;
        resize(master.buffer_size);
        memcpy(sensor_data, master.sensor_data, buffer_size*sizeof(unsigned short));
    }

    BufferData& operator=(const BufferData& master)
    {
        if (this == &master)
            return *this;    //self-assignment
        sync_frame = master.sync_frame;
        resize(master.buffer_size);
        memcpy(sensor_data, master.sensor_data, buffer_size*sizeof(unsigned short));
        return *this;
    }

    ~BufferData()
    {
        resize(0);  // :)
    }

    //unsigned short sensor_data[DATA_SENSORS_PER_BOARD * DATA_SAMPLES_PER_SENSOR];
};

typedef CBuffer<BufferData> DataBuffer;

class DataReceiver : public QObject
{
    Q_OBJECT
public:
    explicit DataReceiver(QObject *parent = 0);
    ~DataReceiver();

    void configureEthSettings(QHostAddress address_to_set, quint16 port_to_set);
    void configureBunchSize(int dma, int eth);
    void outputEnable(int en);


    int frameRate = 0;
    int devNr = 0;
    int sensorsPerBoard = 2;

    DataBuffer dataBuffer;


signals:
    void sigInit();
    void sigDeinit();
    void sigConfigureEthSettings();
    void sigDataReady(DataReceiver* ptr);

public slots:

    void onTimer();
protected:
    void init();
    void deinit();
    QThread thread;
    QSemaphore initSemaphore;
    QTimer* timer = NULL;
    QUdpSocket* dataSocket = NULL;
    QHostAddress address;
    quint16 port;
    int outputEnabled = 0;
    int dmaBunch = 1;
    int ethBunch = 1;
    char tmpBuffer[DATA_MAX_PACKET_SIZE];
    int framesReceived = 0; //to calculate frame rate
    int framesFromLastSig = 0;

protected slots:
    void readData();
    void onInit();
    void onDeinit();
    void onConfigureEthSettings();
};

#endif // DATARECEIVER_H