#include "caldevice.h"

#include <thread>

#include <QDebug>

using namespace std;

CalDevice::CalDevice(QString serial) :
    usb(new USBDevice(serial))
{
    // Check device identification
    auto id = usb->Query("*IDN?");
    if(!id.startsWith("LibreCAL_")) {
        delete usb;
        throw std::runtime_error("Invalid response to *IDN?: "+id.toStdString());
    }

    firmware = usb->Query(":FIRMWARE?");
    QString ports = usb->Query(":PORTS?");
    bool okay;
    numPorts = ports.toInt(&okay);
    if(!okay) {
        numPorts = 0;
    }
}

CalDevice::~CalDevice()
{
    delete usb;
}

QString CalDevice::StandardToString(CalDevice::Standard s)
{
    switch(s) {
    case Standard::Open: return "OPEN";
    case Standard::Short: return "SHORT";
    case Standard::Load: return "LOAD";
    case Standard::Through: return "THROUGH";
    case Standard::None: return "NONE";
    }
    return "Invalid";
}

CalDevice::Standard CalDevice::StandardFromString(QString s)
{
    for(int i=0;i<=(int) Standard::None;i++) {
        if(s == StandardToString((Standard) i)) {
            return (Standard) i;
        }
    }
    return Standard::None;
}

CalDevice::Standard CalDevice::getStandard(int port)
{
    auto query = ":PORT? "+QString::number(port);
    auto response = usb->Query(query);
    return StandardFromString(response);
}

bool CalDevice::setStandard(int port, CalDevice::Standard s)
{
    auto cmd = ":PORT "+QString::number(port)+" "+StandardToString(s);
    return usb->Cmd(cmd);
}

std::vector<CalDevice::Standard> CalDevice::availableStandards()
{
    return {Standard::None, Standard::Open, Standard::Short, Standard::Load, Standard::Through};
}

double CalDevice::getTemperature()
{
    QString tempString = usb->Query(":TEMP?");
    bool okay;
    double temp = tempString.toDouble(&okay);
    if(!okay) {
        temp = 0.0;
    }
    return temp;
}

bool CalDevice::stabilized()
{
    auto stable = usb->Query(":TEMPerature:STABLE?");
    return stable == "TRUE";
}

double CalDevice::getHeaterPower()
{
    QString tempString = usb->Query(":HEATER:POWER?");
    bool okay;
    double power = tempString.toDouble(&okay);
    if(!okay) {
        power = 0.0;
    }
    return power;
}

QString CalDevice::serial()
{
    return usb->serial();
}

QString CalDevice::getFirmware() const
{
    return firmware;
}

unsigned int CalDevice::getNumPorts() const
{
    return numPorts;
}

void CalDevice::loadCoefficientSets(QStringList names)
{
    coeffSets.clear();
    new std::thread(&CalDevice::loadCoefficientSetsThread, this, names);
}

void CalDevice::saveCoefficientSets()
{
    if(!hasModifiedCoefficients()) {
        // nothing to do, already done
        emit updateCoefficientsDone(true);
    } else {
        new std::thread(&CalDevice::saveCoefficientSetsThread, this);
    }
}

void CalDevice::loadCoefficientSetsThread(QStringList names)
{
    QStringList coeffList = getCoefficientSetNames();
    if(coeffList.empty()) {
        // something went wrong
        emit updateCoefficientsDone(false);
        return;
    }
    if(names.size() > 0) {
        // check if all the requested names are actually available
        for(auto n : names) {
            if(!coeffList.contains(n)) {
                // this coefficient does not exist
                emit updateCoefficientsDone(false);
                return;
            }
        }
        coeffList = names;
    }
    // get total number of coefficient points for accurate percentage calculation
    unsigned long totalPoints = 0;
    for(auto name : coeffList) {
        for(int i=1;i<=numPorts;i++) {
            totalPoints += usb->Query(":COEFF:NUM? "+name+" P"+QString::number(i)+"_OPEN").toInt();
            totalPoints += usb->Query(":COEFF:NUM? "+name+" P"+QString::number(i)+"_SHORT").toInt();
            totalPoints += usb->Query(":COEFF:NUM? "+name+" P"+QString::number(i)+"_LOAD").toInt();
            for(int j=i+1;j<=numPorts;j++) {
                totalPoints += usb->Query(":COEFF:NUM? "+name+" P"+QString::number(i)+QString::number(j)+"_THROUGH").toInt();
            }
        }
    }
    unsigned long readPoints = 0;
    int lastPercentage = 0;
    for(auto name : coeffList) {
        // create the coefficient set
        CoefficientSet set;
        set.name = name;
        set.ports = numPorts;
        // Read this coefficient set
        for(int i=1;i<=numPorts;i++) {
            auto createCoefficient = [&](QString setName, QString paramName) -> CoefficientSet::Coefficient* {
                int points = usb->Query(":COEFF:NUM? "+setName+" "+paramName).toInt();
                CoefficientSet::Coefficient *c = new CoefficientSet::Coefficient();
                if(paramName.endsWith("THROUGH")) {
                    c->t = Touchstone(2);
                } else {
                    c->t = Touchstone(1);
                }
                for(int i=0;i<points;i++) {
                    QString pString = usb->Query(":COEFF:GET? "+setName+" "+paramName+" "+QString::number(i));
                    QStringList values = pString.split(",");
                    Touchstone::Datapoint p;
                    p.frequency = values[0].toDouble() * 1e9;
                    for(int j = 0;j<(values.size()-1)/2;j++) {
                        double real = values[1+j*2].toDouble();
                        double imag = values[2+j*2].toDouble();
                        p.S.push_back(complex<double>(real, imag));
                    }
                    if(p.S.size() == 4) {
                        // S21 and S12 are swapped in the touchstone file order (S21 goes first)
                        // but Touchstone::AddDatapoint expects S11 S12 S21 S22 order. Swap to match that
                        swap(p.S[1], p.S[2]);
                    }
                    c->t.AddDatapoint(p);
                    readPoints++;
                    int newPercentage = readPoints * 100 / totalPoints;
                    if(newPercentage != lastPercentage) {
                        lastPercentage = newPercentage;
                        emit updateCoefficientsPercent(newPercentage);
                    }
                }
                c->t.setFilename("LibreCAL/"+paramName);
                return c;
            };
            set.opens.push_back(createCoefficient(name, "P"+QString::number(i)+"_OPEN"));
            set.shorts.push_back(createCoefficient(name, "P"+QString::number(i)+"_SHORT"));
            set.loads.push_back(createCoefficient(name, "P"+QString::number(i)+"_LOAD"));
            for(int j=i+1;j<=numPorts;j++) {
                set.throughs.push_back(createCoefficient(name, "P"+QString::number(i)+QString::number(j)+"_THROUGH"));
            }
        }
        coeffSets.push_back(set);
    }
    emit updateCoefficientsDone(true);
}

void CalDevice::saveCoefficientSetsThread()
{
    // figure out how many points need to be transferred
    unsigned long totalPoints = 0;
    for(auto set : coeffSets) {
        for(auto c : set.opens) {
            if(c->modified) {
                totalPoints += c->t.points();
            }
        }
        for(auto c : set.shorts) {
            if(c->modified) {
                totalPoints += c->t.points();
            }
        }
        for(auto c : set.loads) {
            if(c->modified) {
                totalPoints += c->t.points();
            }
        }
        for(auto c : set.throughs) {
            if(c->modified) {
                totalPoints += c->t.points();
            }
        }
    }
    unsigned long transferredPoints = 0;
    int lastPercentage = 0;
    bool success = true;
    for(auto set : coeffSets) {
        auto createCoefficient = [&](QString setName, QString paramName, Touchstone &t, bool &modified) -> bool {
            if(!modified) {
                // no changes, nothing to do
                return true;
            }
            int points = t.points();
            if(points > 0) {
                // create the file
                if(!usb->Cmd(":COEFF:CREATE "+setName+" "+paramName)) {
                    return false;
                }
                for(int i=0;i<points;i++) {
                    auto point = t.point(i);
                    if(point.S.size() == 4) {
                        // S parameters in point are in S11 S12 S21 S22 order but the LibreCAL expects
                        // S11 S21 S12 S22 (according to the two port touchstone format. Swap here.
                        swap(point.S[1], point.S[2]);
                    }
                    QString cmd = ":COEFF:ADD "+QString::number(point.frequency / 1000000000.0);
                    for(auto s : point.S) {
                        cmd += " "+QString::number(s.real())+" "+QString::number(s.imag());
                    }
                    if(!usb->Cmd(cmd)) {
                        return false;
                    }
                    transferredPoints++;
                    int newPercentage = transferredPoints * 100 / totalPoints;
                    if(newPercentage != lastPercentage) {
                        lastPercentage = newPercentage;
                        emit updateCoefficientsPercent(newPercentage);
                    }
                }
                if(!usb->Cmd(":COEFF:FIN")) {
                    return false;
                }
            } else {
                // no points, delete coefficient
                if(!usb->Cmd(":COEFF:DEL "+setName+" "+paramName)) {
                    return false;
                }
            }
            modified = false;
            return true;
        };
        for(int i=1;i<=numPorts;i++) {
            success &= createCoefficient(set.name, "P"+QString::number(i)+"_OPEN", set.opens[i-1]->t, set.opens[i-1]->modified);
            success &= createCoefficient(set.name, "P"+QString::number(i)+"_SHORT", set.shorts[i-1]->t, set.shorts[i-1]->modified);
            success &= createCoefficient(set.name, "P"+QString::number(i)+"_LOAD", set.loads[i-1]->t, set.loads[i-1]->modified);
            for(int j=i+1;j<=numPorts;j++) {
                success &= createCoefficient(set.name, "P"+QString::number(i)+QString::number(j)+"_THROUGH", set.getThrough(i,j)->t, set.getThrough(i,j)->modified);
            }
        }
    }
    emit updateCoefficientsDone(success);
}

std::vector<CalDevice::CoefficientSet> CalDevice::getCoefficientSets() const
{
    return coeffSets;
}

QStringList CalDevice::getCoefficientSetNames()
{
    QString resp = usb->Query(":COEFF:LIST?");
    if(!resp.startsWith("FACTORY")) {
        return QStringList();
    }
    return resp.split(",");
}

bool CalDevice::hasModifiedCoefficients()
{
    for(auto set : coeffSets) {
        for(auto c : set.opens) {
            if(c->modified) {
                return true;
            }
        }
        for(auto c : set.shorts) {
            if(c->modified) {
                return true;
            }
        }
        for(auto c : set.loads) {
            if(c->modified) {
                return true;
            }
        }
        for(auto c : set.throughs) {
            if(c->modified) {
                return true;
            }
        }
    }
    return false;
}

CalDevice::CoefficientSet::Coefficient *CalDevice::CoefficientSet::getThrough(int port1, int port2) const
{
    if(port1 > ports || port2 > ports || port1 >= port2) {
        return nullptr;
    }
    int index = port2 - port1 - 1;
    while(port1 > 1) {
        index += ports - port1 + 1;
        port1--;
    }
    return throughs[index];
}