#ifndef QORDERLISTMANAGER_H
#define QORDERLISTMANAGER_H

#include <QObject>
#include <QMap>
#include <QMutex>
#include <QSharedPointer>
#include <QDateTime>

struct OrderBookItem {
    double price = 0.0;
    double volume = 0.0;
    int orderCount = 0;
    QString orderId;

    bool isValid() const {
        return price > 0 && volume > 0 && !orderId.isEmpty();
    }

    bool operator==(const OrderBookItem& other) const {
        return orderId == other.orderId;
    }
};

class QOrderListManager : public QObject
{
    Q_OBJECT
public:
    enum OrderType {
        BidOrder,   // 买单
        AskOrder    // 卖单
    };
    Q_ENUM(OrderType)

    static QOrderListManager* instance();
    static void destroy();

    // 订单簿操作
    bool addOrder(OrderType type, const OrderBookItem& order);
    bool updateOrder(OrderType type, const QString& orderId, const OrderBookItem& newData);
    bool removeOrder(OrderType type, const QString& orderId);
    QSharedPointer<OrderBookItem> getOrder(OrderType type, const QString& orderId) const;

    // 获取订单簿数据
    QMap<double, QList<QSharedPointer<OrderBookItem>>> getBidOrders() const;
    QMap<double, QList<QSharedPointer<OrderBookItem>>> getAskOrders() const;

    // 聚合数据
    QMap<double, double> getBidPriceLevels() const;  // 价格 -> 总量
    QMap<double, double> getAskPriceLevels() const;

    // 统计信息
    double getTotalBidVolume() const;
    double getTotalAskVolume() const;
    double getBestBidPrice() const;
    double getBestAskPrice() const;

signals:
    void orderAdded(OrderType type, const OrderBookItem& order);
    void orderUpdated(OrderType type, const QString& orderId);
    void orderRemoved(OrderType type, const QString& orderId);
    void orderBookChanged();

private:
    explicit QOrderListManager(QObject* parent = nullptr);
    ~QOrderListManager();

    void sortOrders(OrderType type);
    void calculatePriceLevels();

    static QBasicAtomicPointer<QOrderListManager> s_instance;
    static QMutex s_mutex;

    // 买单和卖单分别存储，按价格排序
    QMap<double, QList<QSharedPointer<OrderBookItem>>> m_bidOrders;
    QMap<double, QList<QSharedPointer<OrderBookItem>>> m_askOrders;

    // 价格层级聚合数据
    QMap<double, double> m_bidPriceLevels;
    QMap<double, double> m_askPriceLevels;

    mutable QMutex m_orderMutex;

    Q_DISABLE_COPY(QOrderListManager)
};

#endif // QORDERLISTMANAGER_H