#ifndef GLOBAL_H
#define GLOBAL_H

#include <QGraphicsItem>
#include <QtCore/QMetaObject>
#include <QtSwap>
#include <QHash>

const double g_dGriaphicsScene_Width = 800;
const double g_dGriaphicsScene_Height = 600;

//Q_NAMESPACE
enum GraphicsItemType
{
    GIT_base = QGraphicsItem::UserType + 1,
    GIT_line = QGraphicsItem::UserType + 2,
    GIT_rect = QGraphicsItem::UserType + 3,
    GIT_roundRect = QGraphicsItem::UserType + 4,
    GIT_ellipse = QGraphicsItem::UserType + 5,
    GIT_polygon = QGraphicsItem::UserType + 6,
    //======================================
    GIT_bus = QGraphicsItem::UserType + 50,
    GIT_itemRect = QGraphicsItem::UserType + 51,
    GIT_itemTri = QGraphicsItem::UserType + 52,
    GIT_link= QGraphicsItem::UserType + 53
};

enum DiagramMode        //组态图模式
{
    DM_edit = 0,
    DM_run
};
//Q_ENUM_NS(GraphicsItemType)

/**
 * Constants used for fetching QVariant data from GraphModel.
 */
enum class NodeRole {
    Type = 0,           ///< Type of the current node, usually a string.
    Position = 1,       ///< `QPointF` positon of the node on the scene.
    Size = 2,           ///< `QSize` for resizable nodes.
    CaptionVisible = 3, ///< `bool` for caption visibility.
    Caption = 4,        ///< `QString` for node caption.
    Style = 5,          ///< Custom NodeStyle as QJsonDocument
    InternalData = 6,   ///< Node-stecific user data as QJsonObject
    InPortCount = 7,    ///< `unsigned int`
    OutPortCount = 9,   ///< `unsigned int`
    Widget = 10,        ///< Optional `QWidget*` or `nullptr`
};
//Q_ENUM_NS(NodeRole)

/**
 * Specific flags regulating node features and appeaarence.
 */
enum NodeFlag {
    NoFlags = 0x0,   ///< Default NodeFlag
    Resizable = 0x1, ///< Lets the node be resizable
    Locked = 0x2
};

Q_DECLARE_FLAGS(NodeFlags, NodeFlag)
//Q_FLAG_NS(NodeFlags)
Q_DECLARE_OPERATORS_FOR_FLAGS(NodeFlags)

/**
 * Constants for fetching port-related information from the GraphModel.
 */
enum class PortRole {
    Data = 0,                 ///< `std::shared_ptr<NodeData>`.
    DataType = 1,             ///< `QString` describing the port data type.
    ConnectionPolicyRole = 2, ///< `enum` ConnectionPolicyRole
    CaptionVisible = 3,       ///< `bool` for caption visibility.
    Caption = 4,              ///< `QString` for port caption.
};
//Q_ENUM_NS(PortRole)

/**
 * Defines how many connections are possible to attach to ports. The
 * values are fetched using PortRole::ConnectionPolicy.
 */
enum class ConnectionPolicy {
    One,  ///< Just one connection for each port.
    Many, ///< Any number of connections possible for the port.
};
//Q_ENUM_NS(ConnectionPolicy)

/**
 * Used for distinguishing input and output node ports.
 */
enum class PortType {
    In = 0,  ///< Input node port (from the left).
    Out = 1, ///< Output node port (from the right).
    None = 2
};
//Q_ENUM_NS(PortType)

enum PortState
{
    P_const = 0,        //固定端口
    p_movable,          //移动端口
};

using PortCount = int;

/// ports are consecutively numbered starting from zero.
using PortIndex = int;

const PortIndex InvalidPortIndex = -1;

/// Unique Id associated with each node in the GraphModel.
using NodeId = int;

const NodeId InvalidNodeId = -1;

/**
 * A unique connection identificator that stores
 * out `NodeId`, out `PortIndex`, in `NodeId`, in `PortIndex`
 */
struct ConnectionId
{
    int conId;
    NodeId outNodeId;
    PortIndex outPortIndex;
    NodeId inNodeId;
    PortIndex inPortIndex;
};

inline uint qHash(const ConnectionId &data, uint seed){

    return data.conId;
}

inline bool operator<(ConnectionId const &a, ConnectionId const &b)
{
    return a.conId<b.conId;
}

inline bool operator==(ConnectionId const &a, ConnectionId const &b)
{
    return a.outNodeId == b.outNodeId && a.outPortIndex == b.outPortIndex
           && a.inNodeId == b.inNodeId && a.inPortIndex == b.inPortIndex;
}

inline bool operator!=(ConnectionId const &a, ConnectionId const &b)
{
    return !(a == b);
}

inline void invertConnection(ConnectionId &id)
{
    qSwap(id.outNodeId, id.inNodeId);
    qSwap(id.outPortIndex, id.inPortIndex);
}

#endif