#include <epicsMath.h>
#include <dbAccess.h>
#include <dbScan.h>
#include <dbLink.h>
#include <recGbl.h>
#include <alarm.h>

#include <longinRecord.h>
#include <waveformRecord.h>
#include <menuFtype.h>

#include <epicsExport.h>

namespace {

// pi/180
static const double pi_180 = 0.017453292519943295;

int dummy;

long init_spin(waveformRecord* prec) {
    if (prec->ftvl == menuFtypeDOUBLE)
        prec->dpvt = &dummy;
    return 0;
}

long process_spin(waveformRecord* prec) {
    if (prec->dpvt != &dummy) {
        (void)recGblSetSevr(prec, COMM_ALARM, INVALID_ALARM);
        return 0;
    }

    const double freq = 360.0 * pi_180 / 100; // rad/sample
    double phase = 0;
    double* val = static_cast<double*>(prec->bptr);

    long ret = dbGetLink(&prec->inp, DBF_DOUBLE, &phase, 0, 0);
    if (ret) {
        (void)recGblSetSevr(prec, LINK_ALARM, INVALID_ALARM);
        return ret;
    }

    phase *= pi_180; // deg -> rad

    for (size_t i = 0, N = prec->nelm; i < N; i++)
        val[i] = sin(freq * i + phase);

    prec->nord = prec->nelm;

#ifdef DBRutag
    prec->utag = (prec->utag + 1u) & 0x7fffffff;
#endif

    return 0;
}

long process_utag(longinRecord* prec) {
    long status = dbGetLink(&prec->inp, DBR_LONG, &prec->val, 0, 0);
#ifdef DBRutag
    prec->utag = prec->val;
#else
    (void)recGblSetSevr(prec, COMM_ALARM, INVALID_ALARM);
#endif
    return status;
}

template<typename REC>
struct dset5 {
    long count;
    long (* report)(int);
    long (* init)(int);
    long (* init_record)(REC*);
    long (* get_ioint_info)(int, REC*, IOSCANPVT*);
    long (* process)(REC*);
};

dset5<waveformRecord> devWfPDBQ2Demo = { 5, 0, 0, &init_spin, 0, &process_spin };
dset5<longinRecord> devLoPDBQ2UTag = { 5, 0, 0, 0, 0, &process_utag };

} // namespace

extern "C" {
epicsExportAddress(dset, devWfPDBQ2Demo);
epicsExportAddress(dset, devLoPDBQ2UTag);
}