/****************************************************************************
**
** Copyright (C) 2012 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the Qt Commercial Charts Add-on.
**
** $QT_BEGIN_LICENSE$
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
** $QT_END_LICENSE$
**
****************************************************************************/

#include "chartdatetimeaxisy_p.h"
#include "chartpresenter_p.h"
#include "qdatetimeaxis.h"
#include <QGraphicsLayout>
#include <QFontMetrics>
#include <QDateTime>
#include <qmath.h>

QTCOMMERCIALCHART_BEGIN_NAMESPACE

ChartDateTimeAxisY::ChartDateTimeAxisY(QDateTimeAxis *axis, ChartPresenter *presenter)
    : VerticalAxis(axis, presenter),
      m_tickCount(0),
      m_axis(axis)
{
}

ChartDateTimeAxisY::~ChartDateTimeAxisY()
{
}

QVector<qreal> ChartDateTimeAxisY::calculateLayout() const
{
    Q_ASSERT(m_tickCount >= 2);

    QVector<qreal> points;
    points.resize(m_tickCount);
    const QRectF &gridRect = gridGeometry();
    const qreal deltaY = gridRect.height() / (m_tickCount - 1);
    for (int i = 0; i < m_tickCount; ++i) {
        int y = i * -deltaY + gridRect.bottom();
        points[i] = y;
    }

    return points;
}

void ChartDateTimeAxisY::updateGeometry()
{
    const QVector<qreal> &layout = ChartAxis::layout();
    if (layout.isEmpty())
        return;
    setLabels(createDateTimeLabels(m_axis->format(), layout.size()));
    VerticalAxis::updateGeometry();
}

void ChartDateTimeAxisY::handleAxisUpdated()
{
    m_tickCount = m_axis->tickCount();
    ChartAxis::handleAxisUpdated();
}

QSizeF ChartDateTimeAxisY::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
    Q_UNUSED(constraint)

    QFontMetrics fn(font());
    QSizeF sh;

    switch (which) {
    case Qt::MinimumSize:
        sh = QSizeF(fn.boundingRect("...").width(), fn.height());
        break;
    case Qt::PreferredSize: {

        const QVector<qreal>& layout = ChartAxis::layout();
        if (layout.isEmpty()) break;
        QStringList ticksList;

        qreal width = 0;
        qreal height = 0;

        for (int i = 0; i < ticksList.size(); ++i) {
            QRectF rect = fn.boundingRect(ticksList.at(i));
            width += rect.width();
            height += qMax(rect.height() + labelPadding(), height);
        }
        sh = QSizeF(width, height);
        break;
    }
    default:
        break;
    }

    return sh;
}

QTCOMMERCIALCHART_END_NAMESPACE