#ifndef NOTEBOOKDATABASEACCESS_H
#define NOTEBOOKDATABASEACCESS_H

#include <QObject>
#include <QSharedPointer>
#include <QtSql/QSqlDatabase>
#include <QSet>

#include <core/global.h>

namespace tests
{
    class TestNotebookDatabase;
}

namespace vnotex
{
    class Node;
    class Notebook;

    class NotebookDatabaseAccess : public QObject
    {
        Q_OBJECT
    public:
        enum { InvalidId = 0 };

        struct TagRecord
        {
            QString m_name;

            QString m_parentName;
        };

        friend class tests::TestNotebookDatabase;

        NotebookDatabaseAccess(Notebook *p_notebook, const QString &p_databaseFile, QObject *p_parent = nullptr);

        bool isFresh() const;

        bool isValid() const;

        void initialize(int p_configVersion);

        bool open();

        void close();

        // Node table.
    public:
        bool addNode(Node *p_node, bool p_ignoreId);

        // Whether there is a record with the same ID in DB and has the same path.
        bool existsNode(const Node *p_node);

        void clearObsoleteNodes();

        bool updateNode(const Node *p_node);

        bool removeNode(const Node *p_node);

        // Tag table.
    public:
        // Will update the tag if exists.
        bool addTag(const QString &p_name, const QString &p_parentName);

        bool addTag(const QString &p_name);

        bool renameTag(const QString &p_name, const QString &p_newName);

        bool removeTag(const QString &p_name);

        // Sorted by parent_name.
        QList<TagRecord> getAllTags();

        QStringList queryTagAndChildren(const QString &p_tag);

        // Node_tag table.
    public:
        bool updateNodeTags(Node *p_node);

        // Return the relative path of nodes of tags @p_tags.
        QStringList getNodesOfTags(const QStringList &p_tags);

    private:
        struct NodeRecord
        {
            ID m_id = InvalidId;

            QString m_name;

            ID m_signature = InvalidId;

            ID m_parentId = InvalidId;
        };

        void setupTables(QSqlDatabase &p_db, int p_configVersion);

        QSqlDatabase getDatabase() const;

        // Return null if not exists.
        QSharedPointer<NodeRecord> queryNode(ID p_id);

        QStringList queryNodeParentPath(ID p_id);

        QString queryNodePath(ID p_id);

        bool nodeEqual(const NodeRecord *p_rec, const Node *p_node) const;

        bool existsNode(const Node *p_node, const NodeRecord *p_rec, const QStringList &p_nodePath);

        bool checkNodePath(const Node *p_node, const QStringList &p_nodePath) const;

        bool removeNode(ID p_id);

        // Return null if not exists.
        QSharedPointer<TagRecord> queryTag(const QString &p_name);

        bool updateTagParent(const QString &p_name, const QString &p_parentName);

        bool addTag(const QString &p_name, const QString &p_parentName, bool p_updateOnExists);

        QStringList queryNodeTags(ID p_id);

        QList<ID> queryTagNodes(const QString &p_tag);

        QList<ID> queryTagNodesRecursive(const QString &p_tag);

        bool removeNodeTags(ID p_id);

        bool addNodeTags(ID p_id, const QStringList &p_tags);

        Notebook *m_notebook = nullptr;

        QString m_databaseFile;

        // From Qt's docs: It is highly recommended that you do not keep a copy of the QSqlDatabase around as a member of a class, as this will prevent the instance from being correctly cleaned up on shutdown.
        QString m_connectionName;

        // Whether it is a new data base whether any tables.
        bool m_fresh = false;

        bool m_valid = false;

        QSet<ID> m_obsoleteNodes;
    };
}

#endif // NOTEBOOKDATABASEACCESS_H