#include "item.h"
#include "connection.h"
#include "myscene.h"
#include <QMenu>
#include <QPainter>
#include <QStyleOptionGraphicsItem>
#include <QGraphicsSceneContextMenuEvent>

Item::Item(const QString &type, QGraphicsItem *parent)
    : QGraphicsObject(parent), type_(type), registerId_("")
{
    setFlags(QGraphicsItem::ItemIsMovable |
             QGraphicsItem::ItemIsSelectable |
             QGraphicsItem::ItemSendsGeometryChanges);
}

QRectF Item::boundingRect() const
{
    return QRectF(-22, -12, 44, 32);
}

QPointF Item::anchorPos(AnchorType type) const
{
    // 对于"按钮"和"指示灯"类型，返回无效坐标
    if (type_ == "按钮" || type_ == "指示灯") {
        return QPointF(std::numeric_limits<qreal>::quiet_NaN(),
                      std::numeric_limits<qreal>::quiet_NaN());
    }

    // 其他类型正常返回连接点位置
    return mapToScene(type == Left ? QPointF(-18, 0) : QPointF(18, 0));
}

void Item::addConnection(Connection* conn)
{
    // 对于"按钮"和"指示灯"类型，不允许添加连接
    if (type_ == "按钮" || type_ == "指示灯")
    {
        return;
    }
    if (!connections_.contains(conn))
    {
        connections_.append(conn);
    }
}

void Item::removeConnection(Connection* conn)
{
    connections_.removeAll(conn);
}

QList<Connection *> Item::connections()
{
    return connections_;
}

QString Item::itemType()
{
    return type_;
}

bool Item::setRegisterId(const QString &id)
{
    if(registerId_.isEmpty())
    {
        registerId_ = id;
        return true;
    }
    return false;
}

void Item::setRegisterValue(const QString &registerId, quint16 value)
{
    if (registerId_ == registerId)
    {
        registerValue_ = value;
        update(); // 触发重绘
    }
}

QStringList Item::resetRegister()
{
    QStringList unboundRegs;
    if (!registerId_.isEmpty()) {
        unboundRegs << registerId_;
        registerId_.clear();
        registerValue_ = 0;
        update();
    }
    return unboundRegs;
}

void Item::MenuActions(QMenu *menu)
{
    menu->addAction("复制");
    menu->addAction("删除");
    menu->addAction("对象");
    menu->addAction("重置");
}

void Item::addMenuActions(QMenu *menu)
{
    Q_UNUSED(menu);
}

void Item::handleMenuAction(QAction *action)
{
    if (action->text() == "复制") {
        emit requestCopy(this);
    }
    if (action->text() == "删除") {
        emit requestDelete(this);
    }
    if (action->text() == "对象"){
        emit requestBindRegister(this);
    }
    if (action->text() == "重置"){
        emit requestReset(this);
    }
}

QVariant Item::itemChange(GraphicsItemChange change, const QVariant &value)
{
//    if (change == QGraphicsItem::ItemPositionChange) {
//        for (Connection* conn : connections_)
//            conn->updatePosition();
//    }
//    if (change == ItemPositionChange && scene()) {
//        // 获取场景（确保是 GridScene）
//        if (auto myScene = dynamic_cast<MyScene*>(scene())) {
//            if (myScene->getSnapToGrid()) {
//                // 获取网格大小
//                int gridSize = myScene->getGridSize();

//                // 对齐到网格
//                QPointF newPos = value.toPointF();
//                qreal xV = qRound(newPos.x() / gridSize) * gridSize;
//                qreal yV = qRound(newPos.y() / gridSize) * gridSize;
//                return QPointF(xV, yV);
//            }
//        }
//    }
    // 处理位置即将改变事件（网格对齐）
    if (change == ItemPositionChange && scene()) {
        QPointF newPos = value.toPointF();

        // 检查是否启用网格对齐
        if (auto myScene = dynamic_cast<MyScene*>(scene())) {
            if (myScene->getSnapToGrid()) {
                int gridSize = myScene->getGridSize();

                // 计算对齐位置
                qreal xV = qRound(newPos.x() / gridSize) * gridSize;
                qreal yV = qRound(newPos.y() / gridSize) * gridSize;

                // 返回对齐后的位置
                return QPointF(xV, yV);
            }
        }
    }
    // 处理位置已改变事件（更新连线）
    else if (change == QGraphicsItem::ItemPositionHasChanged) {
        // 使用范围for循环安全遍历（防止在更新过程中连接被修改）
        QList<Connection*> connectionsCopy = connections_;
        for (Connection* conn : connectionsCopy) {
            if (connections_.contains(conn)) { // 确保连接仍然存在
                conn->updatePosition();
            }
        }
    }
    return QGraphicsObject::itemChange(change, value);
}

void Item::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
    QMenu menu;

    // 创建菜单
    MenuActions(&menu);
    addMenuActions(&menu);

    // 执行菜单
    QAction *selected = menu.exec(event->screenPos());

    // 处理菜单动作
    if (selected) {
        handleMenuAction(selected);
    }
}