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#ifdef QT_OPENGL_SUPPORT

#include <QGLWidget>

#endif

#include "arthurwidgets.h"

#include "hoverpoints.h"

#define printf

HoverPoints::HoverPoints(QWidget *widget, PointShape shape)

    : QObject(widget)

{

    m_widget = widget;

    widget->installEventFilter(this);

    widget->setAttribute(Qt::WA_AcceptTouchEvents);

    m_connectionType = CurveConnection;

    m_sortType = NoSort;

    m_shape = shape;

    m_pointPen = QPen(QColor(255, 255, 255, 191), 1);

    m_connectionPen = QPen(QColor(255, 255, 255, 127), 2);

    m_pointBrush = QBrush(QColor(191, 191, 191, 127));

    m_pointSize = QSize(11, 11);

    m_currentIndex = -1;

    m_editable = true;

    m_enabled = true;

    connect(this, SIGNAL(pointsChanged(const QPolygonF &)),

            m_widget, SLOT(update()));

}

void HoverPoints::setEnabled(bool enabled)

{

    if (m_enabled != enabled) {

        m_enabled = enabled;

        m_widget->update();

    }

}

bool HoverPoints::eventFilter(QObject *object, QEvent *event)

{

    if (object == m_widget && m_enabled) {

        switch (event->type()) {

        case QEvent::MouseButtonPress:

        {

            if (!m_fingerPointMapping.isEmpty())

                return true;

            QMouseEvent *me = (QMouseEvent *) event;

            QPointF clickPos = me->pos();

            int index = -1;

            for (int i=0; i<m_points.size(); ++i) {

                QPainterPath path;

                if (m_shape == CircleShape)

                    path.addEllipse(pointBoundingRect(i));

                else

                    path.addRect(pointBoundingRect(i));

                if (path.contains(clickPos)) {

                    index = i;

                    break;

                }

            }

            if (me->button() == Qt::LeftButton) {

                if (index == -1) {

                    if (!m_editable)

                        return false;

                    int pos = 0;

                    // Insert sort for x or y

                    if (m_sortType == XSort) {

                        for (int i=0; i<m_points.size(); ++i)

                            if (m_points.at(i).x() > clickPos.x()) {

                                pos = i;

                                break;

                            }

                    } else if (m_sortType == YSort) {

                        for (int i=0; i<m_points.size(); ++i)

                            if (m_points.at(i).y() > clickPos.y()) {

                                pos = i;

                                break;

                            }

                    }

                    m_points.insert(pos, clickPos);

                    m_locks.insert(pos, 0);

                    m_currentIndex = pos;

                    firePointChange();

                } else {

                    m_currentIndex = index;

                }

                return true;

            } else if (me->button() == Qt::RightButton) {

                if (index >= 0 && m_editable) {

                    if (m_locks[index] == 0) {

                        m_locks.remove(index);

                        m_points.remove(index);

                    }

                    firePointChange();

                    return true;

                }

            }

        }

        break;

        case QEvent::MouseButtonRelease:

            if (!m_fingerPointMapping.isEmpty())

                return true;

            m_currentIndex = -1;

            break;

        case QEvent::MouseMove:

            if (!m_fingerPointMapping.isEmpty())

                return true;

            if (m_currentIndex >= 0)

                movePoint(m_currentIndex, ((QMouseEvent *)event)->pos());

            break;

        case QEvent::TouchBegin:

        case QEvent::TouchUpdate:

            {

                const QTouchEvent *const touchEvent = static_cast<const QTouchEvent*>(event);

                const QList<QTouchEvent::TouchPoint> points = touchEvent->touchPoints();

                const qreal pointSize = qMax(m_pointSize.width(), m_pointSize.height());

                foreach (const QTouchEvent::TouchPoint &touchPoint, points) {

                    const int id = touchPoint.id();

                    switch (touchPoint.state()) {

                    case Qt::TouchPointPressed:

                        {

                            // find the point, move it

                            QSet<int> activePoints = QSet<int>::fromList(m_fingerPointMapping.values());

                            int activePoint = -1;

                            qreal distance = -1;

                            const int pointsCount = m_points.size();

                            const int activePointCount = activePoints.size();

                            if (pointsCount == 2 && activePointCount == 1) { // only two points

                                activePoint = activePoints.contains(0) ? 1 : 0;

                            } else {

                                for (int i=0; i<pointsCount; ++i) {

                                    if (activePoints.contains(i))

                                        continue;

                                    qreal d = QLineF(touchPoint.pos(), m_points.at(i)).length();

                                    if ((distance < 0 && d < 12 * pointSize) || d < distance) {

                                        distance = d;

                                        activePoint = i;

                                    }

                                }

                            }

                            if (activePoint != -1) {

                                m_fingerPointMapping.insert(touchPoint.id(), activePoint);

                                movePoint(activePoint, touchPoint.pos());

                            }

                        }

                        break;

                    case Qt::TouchPointReleased:

                        {

                            // move the point and release

                            QHash<int,int>::iterator it = m_fingerPointMapping.find(id);

                            movePoint(it.value(), touchPoint.pos());

                            m_fingerPointMapping.erase(it);

                        }

                        break;

                    case Qt::TouchPointMoved:

                        {

                            // move the point

                            const int pointIdx = m_fingerPointMapping.value(id, -1);

                            if (pointIdx >= 0) // do we track this point?

                                movePoint(pointIdx, touchPoint.pos());

                        }

                        break;

                    default:

                        break;

                    }

                }

                if (m_fingerPointMapping.isEmpty()) {

                    event->ignore();

                    return false;

                } else {

                    return true;

                }

            }

            break;

        case QEvent::TouchEnd:

            if (m_fingerPointMapping.isEmpty()) {

                event->ignore();

                return false;

            }

            return true;

            break;

        case QEvent::Resize:

        {

            QResizeEvent *e = (QResizeEvent *) event;

            if (e->oldSize().width() == 0 || e->oldSize().height() == 0)

                break;

            qreal stretch_x = e->size().width() / qreal(e->oldSize().width());

            qreal stretch_y = e->size().height() / qreal(e->oldSize().height());

            for (int i=0; i<m_points.size(); ++i) {

                QPointF p = m_points[i];

                movePoint(i, QPointF(p.x() * stretch_x, p.y() * stretch_y), false);

            }

            firePointChange();

            break;

        }

        case QEvent::Paint:

        {

            QWidget *that_widget = m_widget;

            m_widget = 0;

            QApplication::sendEvent(object, event);

            m_widget = that_widget;

            paintPoints();

#ifdef QT_OPENGL_SUPPORT

            ArthurFrame *af = qobject_cast<ArthurFrame *>(that_widget);

            if (af && af->usesOpenGL())

                af->glWidget()->swapBuffers();

#endif

            return true;

        }

        default:

            break;

        }

    }

    return false;

}

void HoverPoints::paintPoints()

{

    QPainter p;

#ifdef QT_OPENGL_SUPPORT

    ArthurFrame *af = qobject_cast<ArthurFrame *>(m_widget);

    if (af && af->usesOpenGL())

        p.begin(af->glWidget());

    else

        p.begin(m_widget);

#else

    p.begin(m_widget);

#endif

    p.setRenderHint(QPainter::Antialiasing);

    if (m_connectionPen.style() != Qt::NoPen && m_connectionType != NoConnection) {

        p.setPen(m_connectionPen);

        if (m_connectionType == CurveConnection) {

            QPainterPath path;

            path.moveTo(m_points.at(0));

            for (int i=1; i<m_points.size(); ++i) {

                QPointF p1 = m_points.at(i-1);

                QPointF p2 = m_points.at(i);

                qreal distance = p2.x() - p1.x();

                path.cubicTo(p1.x() + distance / 2, p1.y(),

                             p1.x() + distance / 2, p2.y(),

                             p2.x(), p2.y());

            }

            p.drawPath(path);

        } else {

            p.drawPolyline(m_points);

        }

    }

    p.setPen(m_pointPen);

    p.setBrush(m_pointBrush);

    for (int i=0; i<m_points.size(); ++i) {

        QRectF bounds = pointBoundingRect(i);

        if (m_shape == CircleShape)

            p.drawEllipse(bounds);

        else

            p.drawRect(bounds);

    }

}

static QPointF bound_point(const QPointF &point, const QRectF &bounds, int lock)

{

    QPointF p = point;

    qreal left = bounds.left();

    qreal right = bounds.right();

    qreal top = bounds.top();

    qreal bottom = bounds.bottom();

    if (p.x() < left || (lock & HoverPoints::LockToLeft)) p.setX(left);

    else if (p.x() > right || (lock & HoverPoints::LockToRight)) p.setX(right);

    if (p.y() < top || (lock & HoverPoints::LockToTop)) p.setY(top);

    else if (p.y() > bottom || (lock & HoverPoints::LockToBottom)) p.setY(bottom);

    return p;

}

void HoverPoints::setPoints(const QPolygonF &points)

{

    if (points.size() != m_points.size())

        m_fingerPointMapping.clear();

    m_points.clear();

    for (int i=0; i<points.size(); ++i)

        m_points << bound_point(points.at(i), boundingRect(), 0);

    m_locks.clear();

    if (m_points.size() > 0) {

        m_locks.resize(m_points.size());

        m_locks.fill(0);

    }

}

void HoverPoints::movePoint(int index, const QPointF &point, bool emitUpdate)

{

    m_points[index] = bound_point(point, boundingRect(), m_locks.at(index));

    if (emitUpdate)

        firePointChange();

}

inline static bool x_less_than(const QPointF &p1, const QPointF &p2)

{

    return p1.x() < p2.x();

}

inline static bool y_less_than(const QPointF &p1, const QPointF &p2)

{

    return p1.y() < p2.y();

}

void HoverPoints::firePointChange()

{

//    printf("HoverPoints::firePointChange(), current=%d\n", m_currentIndex);

    if (m_sortType != NoSort) {

        QPointF oldCurrent;

        if (m_currentIndex != -1) {

            oldCurrent = m_points[m_currentIndex];

        }

        if (m_sortType == XSort)

            qSort(m_points.begin(), m_points.end(), x_less_than);

        else if (m_sortType == YSort)

            qSort(m_points.begin(), m_points.end(), y_less_than);

        // Compensate for changed order...

        if (m_currentIndex != -1) {

            for (int i=0; i<m_points.size(); ++i) {

                if (m_points[i] == oldCurrent) {

                    m_currentIndex = i;

                    break;

                }

            }

        }

//         printf(" - firePointChange(), current=%d\n", m_currentIndex);

    }

//     for (int i=0; i<m_points.size(); ++i) {

//         printf(" - point(%2d)=[%.2f, %.2f], lock=%d\n",

//                i, m_points.at(i).x(), m_points.at(i).y(), m_locks.at(i));

//     }

    emit pointsChanged(m_points);

}