// SPDX-License-Identifier: MIT
#ifndef DBC_TREE_MODEL_H
#define DBC_TREE_MODEL_H

#include "tree_node.h"
#include <QAbstractItemModel>

/** Read-only model. Owns an immutable tree; all indexes expire on SetTree().
 * Use QPersistentModelIndex to observe reset invalidation. Call on the model thread.
 */
class DbcTreeModel : public QAbstractItemModel {
public:
    enum Column { Name,
                  CanId,
                  PayloadLength,
                  StartBit,
                  BitLength,
                  ByteOrder,
                  Signed,
                  Unit,
                  Comment,
                  ColumnCount };
    // Metadata roles apply on every column; inapplicable roles return invalid QVariant.
    enum Role { NodeTypeRole = Qt::UserRole + 1,
                CanIdRole,
                PayloadLengthRole,
                StartBitRole,
                BitLengthRole,
                LittleEndianRole,
                SignedRole,
                UnitRole,
                CommentRole,
                ValueDescriptionsRole,
                ExtendedRole };

    explicit DbcTreeModel(QObject *parent = nullptr);
    void SetTree(std::unique_ptr<TreeNode> root);
    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const override;
    QModelIndex parent(const QModelIndex &child) const override;
    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
    Qt::ItemFlags flags(const QModelIndex &index) const override;

private:
    const TreeNode *Node(const QModelIndex &index) const;
    std::unique_ptr<TreeNode> m_root;
};
#endif