#include <QPainter>

#include "ZxBaseUtil.h"
#include "nmObjRect.h"
#include "nmObjRectTool.h"

#include <vector>

nmObjRectTool::nmObjRectTool() : nmObjToolBase()
{
    setText(tr("nObjRectTool"));
    m_oNot = NMOT_Rect;
}

bool nmObjRectTool::onLeftDown(const QPointF& pt)
{
	nmObjRect* pObj = dynamic_cast<nmObjRect*>(m_pObj);
    if(NULL == 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);

        m_vecPoints.push_back(pt);

        return true;
    } else { // 已绑定绘图对象

		return nmObjToolBase::onLeftDown(pt);

		/*
		// 判断是否为选中状态
		if (pObj->isSelected()) {
			// 调用基类方法
			return nmObjToolBase::onLeftDown(pt);
		}

		// 击中了点或线
		if (pObj->m_oHitPos != RBP_Unknown && pObj->m_oHitPos != RBP_Inner) {
			pObj->setSelected(true);
			return true;
		}
		// 未击中
		//pObj->setSelected(false);
		return false;
		*/
	}
}

bool nmObjRectTool::onMouseMove(const QPointF& pt)
{
	nmObjRect* pObj = dynamic_cast<nmObjRect*>(m_pObj);
    if(NULL == pObj) { // 绘图对象尚未创建(鼠标选点ing）
        m_ptMove = pt;

        if(m_bTracking) {
            // 调用渲染函数
            updateLastMoveArea(true);
        }

        return true;
    } else { //业已绑定绘图对象
		/*
		// 如果不是选中状态，不需要调用父类的方法
		if (pObj->isSelected()) 
			return nmObjToolBase::onMouseMove(pt);
		else
			return false;
       */
		return nmObjToolBase::onMouseMove(pt);
    }
}

bool nmObjRectTool::onLeftUp(const QPointF& pt)
{
	nmObjRect* pObj = dynamic_cast<nmObjRect*>(m_pObj);
    if(NULL == pObj) { // 绘图对象尚未创建(鼠标选点ing）
        getView()->setCursorKeeping(false);
        changeCursor(Qt::ArrowCursor);

		// 矩形依赖拖拽成形，起点和终点过近时取消本次创建，避免双击或误点生成零尺寸图元。
		double dDistance = 2.2f;
		if ((qAbs(m_ptStart.x() - pt.x()) < dDistance) &&
			(qAbs(m_ptStart.y() - pt.y()) < dDistance)) {
			m_vecPoints.clear();
			m_bTracking = false;
			return true;
		}

        // 保存其余三个点的坐标
        m_ptMove = pt;
        QPointF m_ptOne(m_ptMove.x(), m_ptStart.y()),
                m_ptTwo(m_ptStart.x(), m_ptMove.y());

        m_vecPoints.push_back(m_ptOne); 
        m_vecPoints.push_back(m_ptMove);
        m_vecPoints.push_back(m_ptTwo);

        emit sigPtsFinished(m_vecPoints); // 矩形边界绘制完成

        m_vecPoints.clear();
        m_bTracking = false;

        return true;
    } else { // 已绑定绘图对象
		return nmObjToolBase::onLeftUp(pt);
		/*
		// 选中状态，调用基类方法
		if (pObj->isSelected()) {
			return nmObjToolBase::onLeftUp(pt);
		}
		return false;
		*/
		/*
		if (pObj->m_oHitPos == RBP_Top) {
			return true;
		} else {
			if (pObj->m_oHitPos == RBP_Top)
			{
				pObj->setSelected(true);
				return true;
			}
			else
				return false;
			//return nmObjRectTool::onLeftUp(pt);
		}
		*/
    }
}

bool nmObjRectTool::onLeftDoubleClick(const QPointF& pt)
{
	nmObjRect* pObj = dynamic_cast<nmObjRect*>(m_pObj);
	if(NULL == pObj) { // 绘图对象尚未创建(鼠标选点ing）
		// 矩形创建不依赖双击收尾，创建态直接吞掉双击事件。
		return true;
	} else { // 已绑定绘图对象
		
		// 双击内部，取消选中状态
		if (pObj->m_oHitPos == RBP_Inner) {
			pObj->setSelected(false);
			//pObj->update();
			return true;
		}
		return nmObjToolBase::onLeftDoubleClick(pt);
	}
}

void nmObjRectTool::onPaint(QPainter* painter, const ZxPaintParam& param)
{
    nmObjRect* pObj = dynamic_cast<nmObjRect*>(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 { // 已绑定绘图对象
		/*
		if (pObj->isSelected()){
			paintTrackingRealObj(painter, param);
		}
		*/
       paintTrackingRealObj(painter, param);
    }
}

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

    // 当前正在进行的点
    if(m_bTracking || !m_vecPoints.isEmpty()) {
        QPen pen(Qt::DashLine);
        painter->setPen(pen);

        // 绘制矩形边界(虚线)
        QPointF m_ptOne(m_ptMove.x(), m_ptStart.y()),
                m_ptTwo(m_ptStart.x(), m_ptMove.y());

        painter->drawLine(m_ptStart, m_ptOne);
        painter->drawLine(m_ptOne, m_ptMove);
        painter->drawLine(m_ptMove, m_ptTwo);
        painter->drawLine(m_ptTwo, m_ptStart);
    }

    painter->restore();
}

void nmObjRectTool::paintTrackingRealObj(QPainter* painter, const ZxPaintParam& param)
{

    if(!m_bTracking) {
        return;
    }

    nmObjRect* pObj = dynamic_cast<nmObjRect*>(m_pObj);
    Q_ASSERT(NULL != pObj);

    if (nullptr == pObj)
    {
      return; // 如果pObj为nullptr，直接返回
    }

    int nIndex = pObj->m_nRectHitIndex;
    RectBoundPos eHitPos = pObj->m_oHitPos;

    Qt::CursorShape o = getCursorBy((int)eHitPos, nIndex);

    QVector<QPointF> vec = pObj->getAllPos();
    QPointF ptOld = m_ptStart; // 第一次击中的点
    QPointF ptNew = getCurrentPos(); // 鼠标当前的位置

    if(eHitPos == RBP_LeftTop || eHitPos == RBP_RightBottom) { // 击中左上角或右下角
        if(nIndex >= 0 && nIndex < vec.count()) {
            //更新相邻的三个点的位置
            vec[nIndex] = getCurrentPos();
            vec[(nIndex + 3) % 4].setX(vec[nIndex].x());
            vec[(nIndex + 1) % 4].setY(vec[nIndex].y());
        }
    } else if(eHitPos == RBP_RightTop || eHitPos == RBP_LeftBottom) { // 击中右上角或左下角
        if(nIndex >= 0 && nIndex < vec.count()) {
            vec[nIndex] = getCurrentPos();
            vec[(nIndex + 3) % 4].setY(vec[nIndex].y());
            vec[(nIndex + 1) % 4].setX(vec[nIndex].x());
        }
    } else if(eHitPos == RBP_Top || eHitPos == RBP_Bottom) { // 击中上边或下边，只能纵向移动
        if(nIndex >= 0 && nIndex < vec.count()) {
            QPointF p1 = ptNew;
            p1.setX(ptOld.x());
            vec[nIndex] = pObj->offsetPoint(vec[nIndex], ptOld, p1);
            vec[(nIndex + 1) % 4] = pObj->offsetPoint(vec[(nIndex + 1) % 4], ptOld, p1);
        }
    } else if(eHitPos == RBP_Left || eHitPos == RBP_Right) { // 击中左边或右边，只能横向移动
        if(nIndex >= 0 && nIndex < vec.count()) {
            ptNew.setY(ptOld.y());
            vec[nIndex] = pObj->offsetPoint(vec[nIndex], ptOld, ptNew);
            vec[(nIndex + 1) % 4] = pObj->offsetPoint(vec[(nIndex + 1) % 4], ptOld, ptNew);
        }
    } else if(eHitPos == RBP_Inner) { // 击中内部，整体移动
        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);

	// 绘制矩形路径
    QPainterPath oPath;
    oPath.moveTo(vec[0]);
    for(int i = 1; i < vec.count(); i++) {
        oPath.lineTo(vec[i]);
    }
    oPath.closeSubpath();

	// 填充路径背景
    QColor clr = pObj->getBackgrdColor();
    clr.setAlpha(128);
    painter->fillPath(oPath, QBrush(clr));

    changeCursor(o);

    painter->restore();
}

Qt::CursorShape nmObjRectTool::getCursorBy(const int& nOption,
        const int& nSubIndex)
{
	nmObjRect* pObj = dynamic_cast<nmObjRect*>(m_pObj);
	Q_ASSERT(NULL != pObj);

        if (nullptr == pObj)
        {
          return Qt::ArrowCursor; // 如果pObj为nullptr，直接返回
        }

	RectBoundPos eHitPos = pObj->m_oHitPos;

	// 选择状态下起作用
	if (!pObj->isSelected()) {
		return Qt::ArrowCursor;
	}
	
    if(eHitPos == RBP_LeftTop || eHitPos == RBP_RightBottom) {
        return (Qt::SizeFDiagCursor);
    } else if(eHitPos == RBP_RightTop || eHitPos == RBP_LeftBottom) {
        return (Qt::SizeBDiagCursor);
    } else if(eHitPos == RBP_Top || eHitPos == RBP_Bottom) {
        return (Qt::SizeVerCursor);
    } else if(eHitPos == RBP_Left || eHitPos == RBP_Right) {
        return (Qt::SizeHorCursor);
    } else if(eHitPos == RBP_Inner) {
        return (Qt::PointingHandCursor); // 手
    }

    return Qt::ArrowCursor; // 鼠标
}