/****************************************************************************
**
** 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
** $QT_END_LICENSE$
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****************************************************************************/

#include "xychartitem_p.h"
#include "qxyseries.h"
#include "qxyseries_p.h"
#include "chartpresenter_p.h"
#include "chartanimator_p.h"
#include <QPainter>
#include <QGraphicsSceneMouseEvent>


QTCOMMERCIALCHART_BEGIN_NAMESPACE

//TODO: optimize : remove points which are not visible

XYChartItem::XYChartItem(QXYSeries *series, ChartPresenter *presenter):ChartItem(presenter),
    m_minX(0),
    m_maxX(0),
    m_minY(0),
    m_maxY(0),
    m_series(series)
{
    connect(series->d_func(),SIGNAL(pointReplaced(int)),this,SLOT(handlePointReplaced(int)));
    connect(series->d_func(),SIGNAL(pointAdded(int)),this,SLOT(handlePointAdded(int)));
    connect(series->d_func(),SIGNAL(pointRemoved(int)),this,SLOT(handlePointRemoved(int)));
    connect(this,SIGNAL(clicked(const QPointF&)),series,SIGNAL(clicked(const QPointF&)));
}

QPointF XYChartItem::calculateGeometryPoint(const QPointF &point) const
{
    const qreal deltaX = m_size.width()/(m_maxX-m_minX);
    const qreal deltaY = m_size.height()/(m_maxY-m_minY);
    qreal x = (point.x() - m_minX)* deltaX;
    qreal y = (point.y() - m_minY)*-deltaY + m_size.height();
    return QPointF(x,y);
}


QPointF XYChartItem::calculateGeometryPoint(int index) const
{
    const qreal deltaX = m_size.width()/(m_maxX-m_minX);
    const qreal deltaY = m_size.height()/(m_maxY-m_minY);
    qreal x = (m_series->x(index) - m_minX)* deltaX;
    qreal y = (m_series->y(index) - m_minY)*-deltaY + m_size.height();
    return QPointF(x,y);
}

QVector<QPointF> XYChartItem::calculateGeometryPoints() const
{
    const qreal deltaX = m_size.width()/(m_maxX-m_minX);
    const qreal deltaY = m_size.height()/(m_maxY-m_minY);

    QVector<QPointF> points;
    points.reserve(m_series->count());
    for (int i = 0; i < m_series->count(); ++i) {
        qreal x = (m_series->x(i) - m_minX)* deltaX;
        qreal y = (m_series->y(i) - m_minY)*-deltaY + m_size.height();
        points << QPointF(x,y);
    }
    return points;
}

QPointF XYChartItem::calculateDomainPoint(const QPointF &point) const
{
    const qreal deltaX = m_size.width()/(m_maxX-m_minX);
    const qreal deltaY = m_size.height()/(m_maxY-m_minY);
    qreal x = point.x()/deltaX +m_minX;
    qreal y = (point.y()-m_size.height())/(-deltaY)+ m_minY;
    return QPointF(x,y);
}

void XYChartItem::updateLayout(QVector<QPointF> &oldPoints, QVector<QPointF> &newPoints,int index)
{
    if (animator()) {
        animator()->updateLayout(this,oldPoints,newPoints,index);
    } else {
        setLayout(newPoints);
    }
}

void XYChartItem::setLayout(QVector<QPointF> &points)
{
    m_points = points;
    update();
}

//handlers

void XYChartItem::handlePointAdded(int index)
{
    QVector<QPointF> points = m_points;
    QPointF point;
    if (m_series->model()) {
        point = calculateGeometryPoint(index - m_series->mapFirst());
        if (index < m_series->mapFirst()) {
            points.insert(0, point);
            updateLayout(m_points, points, 0);
        }
        else {
            points.insert(index - m_series->mapFirst(), point);
            updateLayout(m_points, points, index - m_series->mapFirst());
        }
    }
    else {
        // this checks do not work correctly if model is set
        Q_ASSERT(index<m_series->count());
        Q_ASSERT(index>=0);
        point = calculateGeometryPoint(index);
        points.insert(index, point);
        updateLayout(m_points, points, index);
    }
    update();
}
void XYChartItem::handlePointRemoved(int index)
{
    QVector<QPointF> points = m_points;
    if (m_series->model()) {
        if (index < m_series->mapFirst())
            points.remove(0);
        else
            points.remove(index - m_series->mapFirst());
        updateLayout(m_points, points, index - m_series->mapFirst());
    }
    else {
        // this checks do not work correctly if model is set
        Q_ASSERT(index<m_series->count() + 1);
        Q_ASSERT(index>=0);
        points.remove(index);
        updateLayout(m_points, points, index);
    }
    update();
}

void XYChartItem::handlePointReplaced(int index)
{
    Q_ASSERT(index<m_series->count());
    Q_ASSERT(index>=0);
    QPointF point = calculateGeometryPoint(index);
    QVector<QPointF> points = m_points;
    points.replace(index,point);
    updateLayout(m_points,points,index);
    update();
}

void XYChartItem::handleDomainChanged(qreal minX, qreal maxX, qreal minY, qreal maxY)
{
    m_minX=minX;
    m_maxX=maxX;
    m_minY=minY;
    m_maxY=maxY;

    if (isEmpty()) return;
    QVector<QPointF> points = calculateGeometryPoints();
    updateLayout(m_points,points);
    update();
}

void XYChartItem::handleGeometryChanged(const QRectF &rect)
{
    Q_ASSERT(rect.isValid());
    m_size=rect.size();
    m_clipRect=rect.translated(-rect.topLeft());
    setPos(rect.topLeft());

    if (isEmpty()) return;
    QVector<QPointF> points = calculateGeometryPoints();
    updateLayout(m_points,points);
    update();
}


bool XYChartItem::isEmpty()
{
    return !m_clipRect.isValid() || qFuzzyIsNull(m_maxX - m_minX) || qFuzzyIsNull(m_maxY - m_minY);
}

void XYChartItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    emit clicked(calculateDomainPoint(event->pos()));
}

#include "moc_xychartitem_p.cpp"

QTCOMMERCIALCHART_END_NAMESPACE