#include "plcitems.h"

PLCItem::PLCItem(ItemType type, QGraphicsItem *parent)
    : QGraphicsObject(parent), m_type(type)
{
    setFlag(QGraphicsItem::ItemIsMovable, true);
    setFlag(QGraphicsItem::ItemIsSelectable, true);
    setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
    m_boundingRect = QRectF(-50, -30, 100, 60);
}

QRectF PLCItem::boundingRect() const
{
    return m_boundingRect; // 返回我们设置的边界矩形
}

void PLCItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    Q_UNUSED(option);
    Q_UNUSED(widget);

    painter->setRenderHint(QPainter::Antialiasing);
    QPen pen(Qt::black, 1);
    painter->setPen(pen);

    // 根据状态设置填充颜色
    QBrush brush(m_active ? Qt::green : Qt::white);
    painter->setBrush(brush);

    switch (m_type)
    {
    case NormallyOpen:
        // 绘制常开触点
        painter->drawLine(QPointF(-25, 0), QPointF(-10, 0)); // 左横线
        painter->drawLine(QPointF(10, 0), QPointF(25, 0)); // 右横线
        painter->drawLine(QPointF(-10, -20), QPointF(-10, 20)); // 左竖线
        painter->drawLine(QPointF(10, -20), QPointF(10, 20)); // 右竖线
        break;
    case NormallyClosed:
        // 绘制常闭触点
        painter->drawLine(QPointF(-25, 0), QPointF(-10, 0)); // 左横线
        painter->drawLine(QPointF(10, 0), QPointF(25, 0));  // 右横线
        painter->drawLine(QPointF(-10, -20), QPointF(-10, 20)); // 左竖线
        painter->drawLine(QPointF(10, -20), QPointF(10, 20));  // 右竖线
        painter->drawLine(QPointF(10, -20), QPointF(-10, 20)); // 斜线
        break;
    case GreaterThan:
        painter->drawLine(QPointF(-25, 0), QPointF(-15, 0));   // 左横线
        painter->drawLine(QPointF(-15, -20), QPointF(-15, 20));  // 左竖线
        painter->drawLine(QPointF(15, -20), QPointF(15, 20));   // 右竖线
        painter->drawLine(QPointF(15, 0), QPointF(25, 0));      // 右横线
        // 绘制大于号
        painter->drawLine(QPointF(-8, -8), QPointF(10, 0));   // 上斜线
        painter->drawLine(QPointF(-8, 8), QPointF(10, 0));    // 下斜线
        break;

    case GreaterEqual:
        // 绘制大于等于指令
        painter->drawLine(QPointF(-25, 0), QPointF(-15, 0));   // 左横线
        painter->drawLine(QPointF(-15, -20), QPointF(-15, 20));  // 左竖线
        painter->drawLine(QPointF(15, -20), QPointF(15, 20));   // 右竖线
        painter->drawLine(QPointF(15, 0), QPointF(25, 0));      // 右横线
        // 绘制大于号
        painter->drawLine(QPointF(-8, -8), QPointF(10, 0));   // 上斜线
        painter->drawLine(QPointF(-8, 8), QPointF(10, 0));    // 下斜线
        painter->drawLine(QPointF(-8, 13), QPointF(10, 5));   // 等于线
        break;

    case LessThan:
        // 绘制小于指令
        painter->drawLine(QPointF(-25, 0), QPointF(-15, 0));   // 左横线
        painter->drawLine(QPointF(-15, -20), QPointF(-15, 20));  // 左竖线
        painter->drawLine(QPointF(15, -20), QPointF(15, 20));   // 右竖线
        painter->drawLine(QPointF(15, 0), QPointF(25, 0));      // 右横线
        // 绘制小于号
        painter->drawLine(QPointF(-10,0), QPointF(8, 8));   // 上斜线
        painter->drawLine(QPointF(-10,0), QPointF(8, -8));    // 下斜线
        break;

    case LessEqual:
        // 绘制小于等于指令
        painter->drawLine(QPointF(-25, 0), QPointF(-15, 0));   // 左横线
        painter->drawLine(QPointF(-15, -20), QPointF(-15, 20));  // 左竖线
        painter->drawLine(QPointF(15, -20), QPointF(15, 20));   // 右竖线
        painter->drawLine(QPointF(15, 0), QPointF(25, 0));      // 右横线
        // 绘制小于号
        painter->drawLine(QPointF(-10,0), QPointF(8, 8));   // 上斜线
        painter->drawLine(QPointF(-10,0), QPointF(8, -8));    // 下斜线
        painter->drawLine(QPointF(-10,5), QPointF(8, 13));   // 等于线
        break;

    case Equal:
        // 绘制等于指令
        painter->drawLine(QPointF(-25, 0), QPointF(-15, 0));   // 左横线
        painter->drawLine(QPointF(-15, -20), QPointF(-15, 20));  // 左竖线
        painter->drawLine(QPointF(15, -20), QPointF(15, 20));   // 右竖线
        painter->drawLine(QPointF(15, 0), QPointF(25, 0));      // 右横线
        // 绘制等于号
        painter->drawLine(QPointF(-10,0-5), QPointF(10, -5));   // 上横线
        painter->drawLine(QPointF(-10,5), QPointF(10, 5));    // 下横线
        break;

    case Coil:
        painter->drawLine(QPointF(-25, 0), QPointF(-15, 0));   // 左侧横线
        painter->drawArc(QRectF(-15, -15, 15, 30), 90 * 16, 180 * 16);// 绘制左括号 "("
        painter->drawArc(QRectF(0, -15, 15, 30), 270 * 16, 180 * 16);// 绘制右括号 ")"
        painter->drawLine(QPointF(15, 0), QPointF(25, 0));// 右侧横线
        painter->setPen(QPen(Qt::black, 4));// 调整线条宽度使括号更清晰
        break;
    }
}

// 位置变化时强制更新，避免拖影
QVariant PLCItem::itemChange(GraphicsItemChange change, const QVariant &value)
{
    if (change == ItemPositionHasChanged) {
        update(); // 位置变化时刷新绘制
    }
    return QGraphicsItem::itemChange(change, value);
}

void PLCItem::setState(bool active)
{
    if (m_active != active)
    {
        m_active = active;
        update();
        emit stateChanged(active);
    }
}

void PLCItem::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
{
    Q_UNUSED(event);
    setState(!m_active);
}

QPointF PLCItem::leftTerminal() const
{
    return mapToScene(QPointF(-30, 0));
}

QPointF PLCItem::rightTerminal() const
{
    return mapToScene(QPointF(30, 0));
}