/*
	File                 : Double2DayOfWeekFilter.h
	Project              : AbstractColumn
	Description          : Conversion filter double -> QDateTime, interpreting
	the input numbers as days of the week (1 -> Monday).
	--------------------------------------------------------------------
	SPDX-FileCopyrightText: 2007 Knut Franke <knut.franke*gmx.de (use @ for *)>
	SPDX-FileCopyrightText: 2007 Tilman Benkert <thzs@gmx.net>
	SPDX-License-Identifier: GPL-2.0-or-later
*/

#ifndef DOUBLE2DAY_OF_WEEK_FILTER_H
#define DOUBLE2DAY_OF_WEEK_FILTER_H

#include "../AbstractSimpleFilter.h"
#include <QDateTime>
#include <cmath>

//! Conversion filter double -> QDateTime, interpreting the input numbers as days of the week (1 = Monday).
class Double2DayOfWeekFilter : public AbstractSimpleFilter {
	Q_OBJECT

public:
	QDate dateAt(int row) const override {
		if (!m_inputs.value(0))
			return QDate();
		double inputValue = m_inputs.value(0)->valueAt(row);
		if (std::isnan(inputValue))
			return QDate();
		// Don't use Julian days here since support for years < 1 is bad
		// Use 1900-01-01 instead (a Monday)
		return QDate(1900, 1, 1).addDays(qRound(inputValue - 1.0));
	}
	QTime timeAt(int row) const override {
		Q_UNUSED(row)
		return QTime(0, 0, 0, 0);
	}
	QDateTime dateTimeAt(int row) const override {
		return QDateTime(dateAt(row), timeAt(row));
	}

	//! Return the data type of the column
	AbstractColumn::ColumnMode columnMode() const override {
		return AbstractColumn::ColumnMode::Day;
	}

protected:
	//! Using typed ports: only double inputs are accepted.
	bool inputAcceptable(int, const AbstractColumn* source) override {
		return source->columnMode() == AbstractColumn::ColumnMode::Double;
	}
};

#endif // ifndef DOUBLE2DAY_OF_WEEK_FILTER_H
