#include <QPainter>

#include "ZxBaseUtil.h"
#include "nmObjPolygon.h"
#include "nmObjPolygonTool.h"

nmObjPolygonTool::nmObjPolygonTool() : nmObjToolBase()
{
    setText(tr("nObjPolygonTool"));
    m_oNot = NOT_Polygon;
}

bool nmObjPolygonTool::onLeftDown(const QPointF& pt)
{
    if (NULL == m_pObj) //绘图对象尚未创建(鼠标选点ing）
    {
        m_bTracking = true;
        m_ptStart = pt;

        changeCursor(Qt::CrossCursor);

        // 对于持续性选点的工具，需要设置
        getView()->setCursorKeeping(true);

        double nDistance = 3.0f;
        if (m_vecPoints.count() > 2) //如果与第一个点非常接近，自动封闭处理
        {
            if ((qAbs(m_vecPoints[0].x() - pt.x()) < nDistance) && \
                    (qAbs(m_vecPoints[0].y() - pt.y()) < nDistance))
            {
                getView()->setCursorKeeping(false);
                changeCursor(Qt::ArrowCursor);
                emit sigPtsFinished(m_vecPoints);   //注：该句正确执行之后，会把本工具nmObjPolygonTool
                                                    //与View之间detach
                m_vecPoints.clear();
                m_bTracking = false;

                return true;
            }
        }

        m_vecPoints.push_back(pt);

        return true;
    }
    else //业已绑定绘图对象
    {
        return nmObjToolBase::onLeftDown(pt);
    }
}

bool nmObjPolygonTool::onMouseMove(const QPointF& pt)
{
    if (NULL == m_pObj) //绘图对象尚未创建(鼠标选点ing）
    {
        m_ptMove = pt;
        if (m_bTracking)
        {
            updateLastMoveArea(true);
        }
        return true;
    }
    else //业已绑定绘图对象
    {
        return nmObjToolBase::onMouseMove(pt);
    }
}

bool nmObjPolygonTool::onLeftUp(const QPointF& pt)
{
    if (NULL == m_pObj) //绘图对象尚未创建(鼠标选点ing）
    {
//        if (m_bTracking)
//        {
//            m_bTracking = false;
//        }

        if (!m_vecPoints.isEmpty()) //避免本工具被Detach之后无法update
        {
            updateLastMoveArea(true);
        }

        return true;
    }
    else //业已绑定绘图对象
    {
        return nmObjToolBase::onLeftUp(pt);
    }
}

bool nmObjPolygonTool::onLeftDoubleClick(const QPointF& pt)
{
    if (NULL == m_pObj) //绘图对象尚未创建(鼠标选点ing）
    {
        changeCursor(Qt::ArrowCursor);
        emit sigPtsFinished(m_vecPoints);   //注：该句正确执行之后，会把本工具nmObjPolygonTool
        //与View之间detach
        m_vecPoints.clear();

        if (m_bTracking)
        {
            m_bTracking = false;
        }

        return true;
    }
    else //业已绑定绘图对象
    {
        return nmObjToolBase::onLeftDoubleClick(pt);
    }
}

bool nmObjPolygonTool::onMouseWheel(const QPointF& pt, int delta)
{
    return nmObjToolBase::onMouseWheel(pt, delta);
}

void nmObjPolygonTool::onPaint(QPainter* painter, const ZxPaintParam& param)
{
    nmObjPolygon* pObj = dynamic_cast<nmObjPolygon*>(m_pObj);
    if (pObj == NULL) //绘图对象尚未创建(鼠标选点ing）
    {
        Qt::CursorShape o = Qt::CrossCursor;
        changeCursor(o);
        paintTrackingVirtualObj(painter, param);
    }
    else //业已绑定绘图对象
    {
        paintTrackingRealObj(painter, param);
    }
}

void nmObjPolygonTool::paintTrackingVirtualObj(QPainter* painter, const ZxPaintParam& param)
{
    painter->save();

    // 已经选的点
    {
        QPen pen(Qt::SolidLine);
        painter->setPen(pen);
        for (int i = 0; i < m_vecPoints.count() - 1; i++)
        {
            painter->drawLine(m_vecPoints[i], m_vecPoints[i + 1]);
        }
    }
    // 当前正在进行的点
    if (m_bTracking || !m_vecPoints.isEmpty())
    {
        QPen pen(Qt::DashLine);
        painter->setPen(pen);
        painter->drawLine(m_ptStart, m_ptMove);
    }

    painter->restore();
}

void nmObjPolygonTool::paintTrackingRealObj(QPainter* painter, const ZxPaintParam& param)
{
    if (!m_bTracking)
    {
        return;
    }

    nmObjPolygon* pObj = dynamic_cast<nmObjPolygon*>(m_pObj);
    Q_ASSERT (NULL != pObj);
    int nIndex = pObj->m_nHitIndex;
    Qt::CursorShape o = getCursorBy((int)m_oHitOption, nIndex);

    QVector<QPointF> vec = pObj->getAllPos();
    QPointF ptOld = m_ptStart;
    QPointF ptNew = getCurrentPos();
    if (m_oHitOption == OHO_Point)
    {
        if (nIndex >= 0 && nIndex < vec.count())
        {
            vec[nIndex] = getCurrentPos();
        }
    }
    else if (m_oHitOption == OHO_Bound)
    {
        if (nIndex >= 0 && nIndex < vec.count() - 1)
        {
            vec[nIndex] = pObj->offsetPoint(vec[nIndex], ptOld, ptNew);
            vec[nIndex + 1] = pObj->offsetPoint(vec[nIndex + 1], ptOld, ptNew);
        }
    }
    else if (m_oHitOption == OHO_Inner)
    {
        for (int i = 0; i < vec.count(); i++)
        {
            vec[i] = pObj->offsetPoint(vec[i], ptOld, ptNew);
        }
    }
    else
    {
        return;
    }

    painter->save();
    QPen pen(Qt::DashLine);
    painter->setPen(pen);

    QPainterPath oPath;
    oPath.moveTo(vec[0]);
    for (int i = 1; i < vec.count(); i++)
    {
        oPath.lineTo(vec[i]);
    }
    oPath.closeSubpath();

    QColor clr = pObj->getBackgrdColor();
    clr.setAlpha(128);
    painter->fillPath(oPath, QBrush(clr));

    changeCursor(o);

    painter->restore();
}

Qt::CursorShape nmObjPolygonTool::getCursorBy(const int& nOption,
                                           const int& nSubIndex)
{
    if (nOption < 0)
    {
        return Qt::ArrowCursor;
    }

    ObjHitOption oHitOption = (ObjHitOption)nOption;
    if (oHitOption == OHO_Point)
    {
        return (Qt::CrossCursor);
    }
    else if (oHitOption == OHO_Bound)
    {
        return (Qt::SizeAllCursor);
    }
    else if (oHitOption == OHO_Inner)
    {
        return (Qt::SizeAllCursor);
    }

    return Qt::ArrowCursor;
}