/*
 * Copyright (C) 2010 Ixonos Plc.
 *
 * This file is part of fosdem-schedule.
 *
 * fosdem-schedule 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.
 *
 * fosdem-schedule 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
 * fosdem-schedule.  If not, see <http://www.gnu.org/licenses/>.
 */
#include "daynavigatorwidget.h"

#include <QPainter>
#include <QFontMetrics>
#include <QLabel>

#include <QDebug>

DayNavigatorWidget::DayNavigatorWidget(QWidget *aParent)
    : QWidget(aParent)
    , mStartDate(QDate())
    , mEndDate(QDate())
    , mCurDate(QDate())
{
    setupUi(this);
    connect(prevDayButton, SIGNAL(clicked()), SLOT(prevDayButtonClicked()));
    connect(nextDayButton, SIGNAL(clicked()), SLOT(nextDayButtonClicked()));

    mFontMetrics = new QFontMetrics(QLabel().font());
}

void DayNavigatorWidget::setDates(const QDate &aStartDate, const QDate &aEndDate)
{
    Q_ASSERT(aStartDate<=aEndDate);

    //qDebug() << "DayNavigatorWidget::setDates(): " << aStartDate << ", " << aEndDate;
    mStartDate = aStartDate;
    mEndDate = aEndDate;
    mCurDate = aStartDate;

    QRect rect = mFontMetrics->boundingRect(mCurDate.toString("MMM dd yyyy"));

    if(mStartDate==mEndDate) // only one day conference
    {
        prevDayButton->setDisabled(true);
        nextDayButton->setDisabled(true);
        emit(dateChanged(mCurDate));
    }
    else
    {
        // at least 2-days conference
        prevDayButton->setDisabled(true);
        nextDayButton->setDisabled(false);
        emit(dateChanged(mCurDate));
    }
}

void DayNavigatorWidget::prevDayButtonClicked()
{
    //qDebug() << mStartDate << ":" << mCurDate << ":" << mEndDate;
    if(mCurDate>mStartDate)
    {
        mCurDate = mCurDate.addDays(-1);
        // check start date
        if(mCurDate==mStartDate || mStartDate==mEndDate)
            prevDayButton->setDisabled(true);
        else
            prevDayButton->setDisabled(false);
        // check end date
        if(mCurDate==mEndDate || mStartDate==mEndDate)
            nextDayButton->setDisabled(true);
        else
            nextDayButton->setDisabled(false);

        emit(dateChanged(mCurDate));
        selectedDate->update();
    }
}

void DayNavigatorWidget::nextDayButtonClicked()
{
    //qDebug() << mStartDate << ":" << mCurDate << ":" << mEndDate;
    if(mCurDate<mEndDate)
    {
        mCurDate = mCurDate.addDays(1);
        // check start date
        if(mCurDate==mStartDate || mStartDate==mEndDate)
            prevDayButton->setDisabled(true);
        else
            prevDayButton->setDisabled(false);
        // check end date
        if(mCurDate==mEndDate || mStartDate==mEndDate)
            nextDayButton->setDisabled(true);
        else
            nextDayButton->setDisabled(false);

        emit(dateChanged(mCurDate));
        selectedDate->update();
    }
}

void DayNavigatorWidget::paintEvent(QPaintEvent *aEvent)
{
    Q_UNUSED(aEvent);

    QString selectedDateStr = mCurDate.toString("MMM dd yyyy");

    QPainter painter(this);
    painter.save();
    QRect r = selectedDate->geometry();
    QRect s = mFontMetrics->boundingRect(selectedDateStr);
    QPoint p = QPoint(
            r.x() + r.width()/2 - s.height()/2 - mFontMetrics->descent(),
            - 130
            );

    painter.translate(r.width()/2, r.height()/2);
    painter.rotate(270);
    painter.drawText(p.y(), p.x(), selectedDateStr); // y,x,string
    painter.restore();
}