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/**
 * CalibrateiSpindel.cpp is part of bmsapp.
 *
 * bmsapp is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * bmsapp is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include "CalibrateiSpindel.h"
#include "../ui/ui_CalibrateiSpindel.h"
#include "global.h"
#include "Utils.h"
#include "polyfit.h"
#include "MainWindow.h"

/*
 * The following MySQL query produces a table with historic real results:
 *
 * SELECT pr.code,
 *        pr.og,
 *        (SELECT angle FROM log_ispindel WHERE code=pr.code ORDER BY datetime LIMIT 1) as og_angle,
 *        pr.fg,
 *        (SELECT angle FROM log_ispindel WHERE code=pr.code ORDER BY datetime DESC LIMIT 1) as fg_angle
 *   FROM products AS pr
 *   WHERE pr.stage=11 AND pr.log_ispindel=1
 *   ORDER BY pr.fg DESC
 * ;
 */


CalibrateiSpindel::CalibrateiSpindel(int id, QWidget *parent) : QDialog(parent), ui(new Ui::CalibrateiSpindel)
{
    QSqlQuery query;

#ifdef DEBUG_MONITOR
    qDebug() << "CalibrateiSpindel record:" << id;
#endif

    ui->setupUi(this);
    this->recno = id;
    setWindowFlags(Qt::Window | Qt::WindowTitleHint | Qt::CustomizeWindowHint);
    WindowTitle();

    query.prepare("SELECT node,alias,calibrate FROM mon_ispindels WHERE record = :recno");
    query.bindValue(":recno", this->recno);
    query.exec();
    if (query.next()) {

	_node = query.value("node").toString();
	_alias = query.value("alias").toString();
	ui->nameEdit->setText(_node+"/"+_alias);

	QJsonParseError parseError;
        const auto& json = query.value("calibrate").toString();

	if (!json.trimmed().isEmpty()) {
	    const auto& formattedJson = QString("%1").arg(json);
	    QJsonDocument jsonResponse = QJsonDocument::fromJson(formattedJson.toUtf8(),  &parseError);
	    if (parseError.error != QJsonParseError::NoError) {
                qWarning() << "Parse error: " << parseError.errorString() << "at" << parseError.offset ;
            } else {

	    	QJsonObject jsonObj = jsonResponse.object();
		QJsonArray polyData = jsonObj.value("polyData").toArray();
		for (int i = 0; i < polyData.size(); i++) {
		    Old[i] = New[i] = polyData.at(i).toDouble();
		}
		_data_old = QString("(%1 * x^3) + (%2 * x^2) + (%3 * x) + %4").arg(Old[0], 0, 'f', 9, '0').arg(Old[1], 0, 'f', 9, '0').arg(Old[2], 0, 'f', 9, '0').arg(Old[3], 0, 'f', 9, '0');
		ui->oldEdit->setText(_data_old);

		QJsonArray calData = jsonObj.value("calData").toArray();
		oldtotal = 0;
		for (int i = 0; i < calData.size(); i++) {
		    QJsonObject calObj = calData.at(i).toObject();
		    Calibrate c;
		    c.plato = calObj["plato"].toDouble();
		    c.angle = calObj["angle"].toDouble();
		    c.sg = Utils::plato_to_sg(c.plato);
		    nCal.append(c);
		    oCal.append(c);
		    oldtotal++;
		}
		newtotal = oldtotal;
	    }
	}

    }

    connect(ui->dataTable, SIGNAL(cellChanged(int, int)), this, SLOT(cell_Changed(int, int)));
    emit refreshTable();
}


void CalibrateiSpindel::refreshTable()
{
    QString w;
    QWidget* pWidget;
    QHBoxLayout* pLayout;
    double  d, x[12], y[12];
    bool gerror, aerror;

    qDebug() << "refreshTable" << oldtotal << newtotal;

    /*
     * During filling the table turn off the cellChanged signal because every cell that is filled
     * triggers the cellChanged signal. The QTableWidget has no better signal to use.
     */
    this->ignoreChanges = true;

    const QStringList labels({tr("SG"), tr("°Plato"), tr("Angle"), tr("Del")});
    ui->dataTable->setColumnCount(4);
    ui->dataTable->setColumnWidth(0, 100);	/* SG		*/
    ui->dataTable->setColumnWidth(1, 100);	/* °Plato	*/
    ui->dataTable->setColumnWidth(2, 100);	/* Tilt angle	*/
    ui->dataTable->setColumnWidth(3,  55);	/* Del button	*/
    ui->dataTable->setHorizontalHeaderLabels(labels);
    ui->dataTable->verticalHeader()->hide();
    ui->dataTable->setRowCount(newtotal);

    for (int i = 0; i < 12; i++) {
	x[i] = y[i] = 0;
    }

    std::sort(nCal.begin() , nCal.end(), [=]( const Calibrate& test1 , const Calibrate& test2 )->bool {
	return test2.angle < test1.angle;
    });
    this->dataHasErrors = false;

    for (int i = 0; i < newtotal; i++) {

	y[i] = nCal[i].plato;
	x[i] = nCal[i].angle;

	gerror = aerror = false;
	if ((nCal[i].angle < 10) || (nCal[i].angle > 80))
	    aerror = true;
	if (i == 0) {
	    if (nCal[0].plato <= nCal[1].plato)
	    	gerror = true;
	} else if (i == (newtotal -1)) {
	    if (nCal[i].plato != 0)
	    	gerror = true;
	} else {
	    if ((nCal[i].plato <= nCal[i + 1].plato) || (nCal[i].plato >= nCal[i - 1].plato))
		gerror = true;
	}
	if (gerror || aerror)
	    this->dataHasErrors = true;

	w = QString("%1").arg(nCal[i].sg, 1, 'f', 4, '0');
	QTableWidgetItem *item = new QTableWidgetItem(w);
	item->setTextAlignment(Qt::AlignCenter|Qt::AlignVCenter);
	if (gerror)
	    item->setForeground(QBrush(QColor(Qt::red)));
	ui->dataTable->setItem(i, 0, item);

	w = QString("%1").arg(nCal[i].plato, 1, 'f', 3, '0');
        item = new QTableWidgetItem(w);
        item->setTextAlignment(Qt::AlignCenter|Qt::AlignVCenter);
	if (gerror)
	    item->setForeground(QBrush(QColor(Qt::red)));
        ui->dataTable->setItem(i, 1, item);

	w = QString("%1").arg(nCal[i].angle, 1, 'f', 5, '0');
        item = new QTableWidgetItem(w);
        item->setTextAlignment(Qt::AlignCenter|Qt::AlignVCenter);
	if (aerror)
	    item->setForeground(QBrush(QColor(Qt::red)));
        ui->dataTable->setItem(i, 2, item);

	/* Add the Delete row button */
        pWidget = new QWidget();
        QPushButton* btn_del = new QPushButton();
        btn_del->setObjectName(QString("%1").arg(i));  /* Send row with the button */
        btn_del->setText(tr("Del"));
        connect(btn_del, SIGNAL(clicked()), this, SLOT(on_deleteRow_clicked()));
        pLayout = new QHBoxLayout(pWidget);
        pLayout->addWidget(btn_del);
        pLayout->setContentsMargins(5, 0, 5, 0);
        pWidget->setLayout(pLayout);
        ui->dataTable->setCellWidget(i, 3, pWidget);
    }
    int rc = Polyfit::polyfit(newtotal, x, y, 4, New);

    _data_new = QString("(%1 * x^3) + (%2 * x^2) + (%3 * x) + %4").arg(New[0], 0, 'f', 9, '0').arg(New[1], 0, 'f', 9, '0').arg(New[2], 0, 'f', 9, '0').arg(New[3], 0, 'f', 9, '0');
    ui->newEdit->setText(_data_new);

    /*
     * Check the new formula against the old formula.
     */
    this->textIsChanged = (_data_old.compare(_data_new) == 0) ? false:true;
    CalibrateiSpindel::WindowTitle();

    new_plot = new QLineSeries();
    old_plot = new QLineSeries();

    for (int i = 0; i < oldtotal; i++) {
	old_plot->append(oCal[i].angle, oCal[i].plato);
    }
    for (int i = 0; i < newtotal; i++) {
	new_plot->append(nCal[i].angle, nCal[i].plato);
    }

    old_plot->setName(tr("Old"));
    new_plot->setName(tr("New"));

    chart = new QChart();
    chart->setTitle(tr("Calibration plot"));
    chart->addSeries(old_plot);
    chart->addSeries(new_plot);

    QValueAxis *axisX = new QValueAxis;
    axisX->setRange(10, 80);
    axisX->setTickCount(8);
    axisX->setLabelFormat("%.0f");
    axisX->setTitleText(tr("Angle"));
    axisX->setLabelsFont(QFont("Helvetica", 8, QFont::Normal));
    chart->addAxis(axisX, Qt::AlignBottom);
    old_plot->attachAxis(axisX);
    new_plot->attachAxis(axisX);

    QValueAxis *axisY = new QValueAxis;
    axisY->setRange(0, 20);
    axisY->setTickCount(11);
    axisY->setLabelFormat("%.1f");
    axisY->setTitleText("Plato");
    axisY->setLabelsFont(QFont("Helvetica", 8, QFont::Normal));
    chart->addAxis(axisY, Qt::AlignLeft);
    old_plot->attachAxis(axisY);
    new_plot->attachAxis(axisY);

    ui->chartView->setRenderHint(QPainter::Antialiasing);
    ui->chartView->setChart(chart);

    this->ignoreChanges = false;
}


CalibrateiSpindel::~CalibrateiSpindel()
{
    delete ui;
    emit entry_changed();
}


void CalibrateiSpindel::on_quitButton_clicked()
{
    if (this->textIsChanged) {
        int rc = QMessageBox::warning(this, tr("iSpindel calibrate changed"), tr("The calibration data has been modified. Save changes?"),
                                QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel, QMessageBox::Save);
        switch (rc) {
            case QMessageBox::Save:
		    	if (this->dataHasErrors) {
			    QMessageBox::warning(this, tr("iSpindel calibrate"), tr("Data is changed but has errors, not saving."));
			    return;	/* Return to the editor page */
			} else {
                            SaveData();
			}
                        break;  /* Saved and then Quit */
            case QMessageBox::Discard:
                        break;  /* Quit without Save */
            case QMessageBox::Cancel:
                        return; /* Return to the editor page */
        }
    }

    this->close();
    this->setResult(1);
}


void CalibrateiSpindel::SaveData()
{
    QSqlQuery query;

    if (this->textIsChanged) {
	/*
	 * Build json data
	 */
	QJsonObject calObj;
	QJsonArray coeff, poly;

	for (int i = 0; i < 4; i++) {
	    coeff.append(New[i]);
	}
	calObj.insert("polyData", coeff);
	for (int i = 0; i < newtotal; i++) {
	    QJsonObject obj;
	    obj.insert("plato", nCal[i].plato);
	    obj.insert("angle", nCal[i].angle);
	    poly.append(obj);
	}
	calObj.insert("calData", poly);

	query.prepare("UPDATE mon_ispindels SET calibrate=:calibrate WHERE record = :recno");
	query.bindValue(":calibrate", QJsonDocument(calObj).toJson(QJsonDocument::Compact) );
	query.bindValue(":recno", this->recno);
	query.exec();
	if (query.lastError().isValid()) {
            qWarning() << "CalibrateiSpindel" << query.lastError();
            QMessageBox::warning(this, tr("Database error"),
                        tr("MySQL error: %1\n%2\n%3")
                        .arg(query.lastError().nativeErrorCode())
                        .arg(query.lastError().driverText())
                        .arg(query.lastError().databaseText()));
        } else {
            qDebug() << "CalibrateiSpindel Saved";
        }
    }
}


void CalibrateiSpindel::on_deleteRow_clicked()
{
    QPushButton *pb = qobject_cast<QPushButton *>(QObject::sender());
    int row = pb->objectName().toInt();
    qDebug() << "Delete row" << row << newtotal;

    if (newtotal < 4) {
	QMessageBox::warning(this, tr("iSpindel calibrate"), tr("You cannot delete too many rows."));
	return;
    }

    nCal.removeAt(row);
    newtotal--;
    emit refreshTable();
}


void CalibrateiSpindel::on_addButton_clicked()
{
    qDebug() << "Add row" << newtotal;
    this->ignoreChanges = true;

    Calibrate c;
    c.plato = 10.0;
    c.angle = 50.0;
    c.sg = Utils::plato_to_sg(10.0);
    nCal.append(c);
    newtotal++;

    this->ignoreChanges = false;
    emit refreshTable();
}


void CalibrateiSpindel::cell_Changed(int nRow, int nCol)
{
    QString w;

    if (this->ignoreChanges)
        return;

    qDebug() << "Cell at row " + QString::number(nRow) + " column " + QString::number(nCol) + " was changed.";

    if (nCol == 0) {		// SG changed
	double d = ui->dataTable->item(nRow, 0)->text().toDouble();
	if (d < 1.000 || d > 1.100) {
	     QMessageBox::warning(this, tr("iSpindel calibrate"), tr("The SG must be between 1.000 and 1.100."));
	     return;
	}
	nCal[nRow].sg = d;
	nCal[nRow].plato = Utils::sg_to_plato(d);
    } else if (nCol == 1) {
	double d = ui->dataTable->item(nRow, 1)->text().toDouble();
	if (d < 0 || d > 25) {
	    QMessageBox::warning(this, tr("iSpindel calibrate"), tr("Plato must be between 0 and 25."));
	    return;
	}
	nCal[nRow].plato = d;
	nCal[nRow].sg = Utils::plato_to_sg(d);
    } else if (nCol == 2) {
	double d = ui->dataTable->item(nRow, 2)->text().toDouble();
	if (d < 10 || d > 80) {
	    QMessageBox::warning(this, tr("iSpindel calibrate"), tr("The tilt angles must be between 10 and 80."));
	    return;
	}
	nCal[nRow].angle = d;
    }

    emit refreshTable();
}


/*
 * Window header, mark any change with '**'
 */
void CalibrateiSpindel::WindowTitle()
{
    QString txt;

    txt = QString(tr("BMSapp - Calibrate iSpindel %1").arg(this->recno));

    if (this->textIsChanged) {
        txt.append((QString(" **")));
    }
    setWindowTitle(txt);
}