/*
  DateEntrySyncer.cpp

  This file is part of Charm, a task-based time tracking application.

  Copyright (C) 2014-2019 Klar√§lvdalens Datakonsult AB, a KDAB Group company, info@kdab.com

  Author: Frank Osterfeld <frank.osterfeld@kdab.com>

  This program 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 2 of the License, or
  (at your option) any later version.

  This program 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 "DateEntrySyncer.h"
#include "Core/Dates.h"

#include <QDateEdit>
#include <QSpinBox>

DateEntrySyncer::DateEntrySyncer(QSpinBox *week, QSpinBox *year, QDateEdit *date, int weekDay,
                                 QObject *parent)
    : QObject(parent)
    , m_week(week)
    , m_year(year)
    , m_date(date)
    , m_weekDay(weekDay)
{
    connect(m_week, SIGNAL(valueChanged(int)), this, SLOT(dateSelectionChanged()));
    connect(m_year, SIGNAL(valueChanged(int)), this, SLOT(dateSelectionChanged()));
    if (m_date)
        connect(m_date, SIGNAL(dateChanged(QDate)), this, SLOT(dateSelectionChanged()));
}

// number of weeks per year differs between 52 and 53, so we need to set the maximum value accordingly, and fix the value if the user flips through years
static void fixWeek(QSpinBox *yearSb, QSpinBox *weekSb)
{
    const int year = yearSb->value();
    const int week = weekSb->value();
    const int maxWeek = Charm::numberOfWeeksInYear(year);
    Q_ASSERT(maxWeek >= 52);
    const int newWeek = qMin(maxWeek, week);
    weekSb->blockSignals(true);
    weekSb->setMaximum(maxWeek);
    weekSb->setValue(newWeek);
    weekSb->blockSignals(false);
}

void DateEntrySyncer::dateSelectionChanged()
{
    if (sender() == m_week || sender() == m_year) {
        //spinboxes changed, update date edit
        fixWeek(m_year, m_week);
        const int week = m_week->value();
        const int year = m_year->value();
        if (m_date) {
            m_date->blockSignals(true);
            m_date->setDate(Charm::dateByWeekNumberAndWeekDay(year, week, m_weekDay));
            m_date->blockSignals(false);
        }
    } else {
        Q_ASSERT(m_date);
        //date edit changed, update spinboxes
        const QDate date = m_date->date();
        int year = 0;
        const int week = date.weekNumber(&year);
        m_year->blockSignals(true);
        m_week->blockSignals(true);
        m_year->setValue(year);
        m_week->setValue(week);
        m_week->blockSignals(false);
        m_year->blockSignals(false);
    }
}
