#ifndef COMPLETERMODEL_H
#define COMPLETERMODEL_H

#include <QAbstractItemModel>
#include <QIcon>

class CompleterModel;

class CompleterItem {
public:
    CompleterItem(): m_parent(0), m_model(0) { }
    CompleterItem(QString text, QIcon icon): m_parent(0), m_text(text), m_icon(icon), m_model(0) { }
    ~CompleterItem();
    int rowCount() const { return m_children.count(); }
    CompleterItem* child(int row) const
    {
        return m_children.count() > row ? m_children.at(row).data() : nullptr;
    }
    CompleterItem* parent() const { return m_parent; }
    int row() const
    {
        if (m_parent) {
            for (int i = 0; i < m_parent->m_children.count(); ++i) {
                CompleterItem* c = m_parent->m_children.at(i).data();
                if (c == this)
                    return i;
            }
        }
        return -1;
    }
    QString text() { return m_text; }
    QIcon icon() { return m_icon; }

    void setIcon(const QIcon& newIcon);
    void setText(const QString& newText);
    void setModel(CompleterModel* model) { m_model = model; }
    void clear() { m_children.clear(); }
    void appendRow(CompleterItem* child);
    void appendRows(const QList<CompleterItem*>& children);

private:
    CompleterItem* m_parent { nullptr };
    QVector<QSharedPointer<CompleterItem>> m_children;
    QString m_text;
    QIcon m_icon;
    CompleterModel* m_model;
};

class CompleterModel: public QAbstractItemModel {
    friend CompleterItem;

public:
    explicit CompleterModel(QObject* parent = nullptr);

    // QAbstractItemModel interface
public:
    QModelIndex index(int row, int column, const QModelIndex& parent) const;
    QModelIndex parent(const QModelIndex& child) const;
    int rowCount(const QModelIndex& parent) const;
    int columnCount(const QModelIndex& parent) const;
    QVariant data(const QModelIndex& index, int role) const;
    CompleterItem* invisibleRootItem() { return &m_root; }
    QList<CompleterItem*> findItems(const QString& text, Qt::MatchFlags flags = Qt::MatchExactly,
                                    int column = 0) const;
    void clear();

private:
    CompleterItem* itemFromIndex(const QModelIndex index) const;
    QModelIndex indexFromItem(CompleterItem* item) const;

private:
    CompleterItem m_root;

public:
};

#endif // COMPLETERMODEL_H