#ifndef MEMBERLISTMODEL_H
#define MEMBERLISTMODEL_H

#include <QAbstractListModel>
#include <QColor>
#include <QMap>
#include <QString>
#include <QIcon>
#include <QPixmap>

class DbManager;

struct MemberListItem {
    quint64 nodeId = 0;
    bool    online = false;
    bool    isSelf = false;
    QPixmap avatar;
    QString name;
    QString localNick;
    int     rtt = -1;
    int     natType = -1;
};

class MemberListModel : public QAbstractListModel {
    Q_OBJECT
public:
    static const int BATCH     = 40;
    static const int MAX_CACHE = 120;

    explicit MemberListModel(DbManager* db, QObject* parent = nullptr);

    int  rowCount(const QModelIndex& parent = QModelIndex()) const override;
    QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;

    void setChannel(const QString& channelId);
    void refresh();
    void refreshRtt();
    quint64 nodeIdAt(int row) const;

private slots:
    void loadPendingBatch();

private:
    void scheduleBatch(int centerRow) const;
    void loadBatch(int from, int count);
    void evictDistant(int centerRow);
    QPixmap makeAvatar(QColor color, QChar letter) const;

    DbManager* m_db;
    QString    m_channelId;
    int        m_totalCount = 0;
    mutable QMap<int, MemberListItem> m_cache;
    mutable int m_pendingFrom = -1;
    mutable int m_pendingCount = 0;
};

#endif