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 /*
     SPDX-License-Identifier: GPL-2.0-or-later
     SPDX-FileCopyrightText: 2010 Miha Čančula <miha.cancula@gmail.com>
     SPDX-FileCopyrightText: 2018-2022 Alexander Semke <alexander.semke@web.de>
 */
 
 #ifndef CANTOR_DEFAULTVARIABLEMODEL_H
 #define CANTOR_DEFAULTVARIABLEMODEL_H
 
 #include <QAbstractTableModel>
 #include "session.h"
 #include "expression.h"
 
 namespace Cantor {
 
 class DefaultVariableModelPrivate;
 
 /**
  * @brief
  * This DefaultVariableModel class is an implementation of QAbstractItemModel
  * that can be used with the Variable Manager plugin.
  *
  * For most uses the addVariable(), removeVariable() and clearVariables() methods are sufficient.
  * They can be used from session (directly or by connecting signals to them), or called from
  * a subclass.
  *
  * DefaultVariableModel uses the session to run expressions for changing variables, and it
  * gets the commands from the backend's VariableManagementExtension.
  * If you do not want this behavior, you can subclass it and reimplement data() and/or setData().
  *
  * @see Session::variableModel()
  */
 class CANTOR_EXPORT DefaultVariableModel : public QAbstractTableModel
 {
     Q_OBJECT
     Q_PROPERTY(Session* session READ session)
 
 public:
 
     enum {DataRole = Qt::UserRole + 1};
 
     /**
      * A structure representing a variable.
      */
     struct Variable
     {
         Variable(): size(0) {}
         Variable(QString name, QString value, size_t size = 0, QString type = QString(), QString dimension = QString()) :
             name(name), value(value), size(size), type(type), dimension(dimension) {}
 
         QString name;
         QString value;
         size_t size;
         QString type;
         QString dimension;
     };
 
     /**
      * Default constructor
      * If you are constructing a DefaultVariableModel without subclassing, the @p session must be valid
      * and its backends must support a VariableManagementExtension.
      *
      * This requirement can be avoided by reimplementing setData() in a subclass.
      *
      * @param session the session this Model belongs to, also becomes the Model's parent.
      */
     explicit DefaultVariableModel(Session* session);
     ~DefaultVariableModel() override;
 
     /**
      * Get the session which created this Model and whose variables it contains
      * @return the session
      */
     Session* session() const;
 
     /**
      * Returns variables, stored in this model, as @see Variable.
      */
     QList<Variable> variables() const;
 
     /**
      * Returns names of stored variables
      */
     QStringList variableNames() const;
 
     /**
      * Return functions, stored in this model
      */
     QStringList functions() const;
 
     //TODO: improve the description?
     /**
      * Starts updating variable model (variable lists, etc.). Usually executed after finished all user's commands
      */
     virtual void update() {};
 
 public Q_SLOTS:
     /**
      * Adds a variable to the model.
      * If a variable with the same name already exists, it will be overwritten.
      * @param name the name of the variable
      * @param value the value of the variable
      */
     void addVariable(const QString& name, const QString& value);
     /**
      * Convenience method, equivalent to addVariable(variable.name, variable.value)
      * @param variable the variable to add
      */
     void addVariable(const Cantor::DefaultVariableModel::Variable& variable);
     /**
      * Remove the variable @p name from the model.
      * If a variable with the specified @p name doesn't exists, this method does nothing.
      * @param name the name of the variable to remove
      */
     void removeVariable(const QString& name);
     /**
      * Convenience method, equivalent to removeVariable(variable.name)
      * @param variable the variable to remove
      */
     void removeVariable(const Cantor::DefaultVariableModel::Variable& variable);
     /**
      * Clears all variables from the model
      */
     void clearVariables();
 
     /**
      * Clears all functions
      */
     void clearFunctions();
 
 
 Q_SIGNALS:
     /**
      * Emitted after adding new variables
      * @param variables list of new variables
      */
     void variablesAdded(const QStringList& variables);
 
     /**
      * Emitted after variables removing
      * @param variables list of removed variables
      */
     void variablesRemoved(const QStringList& variables);
 
     /**
      * Similar to @c variablesAdded
      */
     void functionsAdded(const QStringList& names);
 
     /**
      * Similar to @c variablesRemoved
      */
     void functionsRemoved(const QStringList funcs);
 
 protected:
     QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
     bool setData(const QModelIndex& index, const QVariant& value, int role = Qt::EditRole) override;
 
     int columnCount(const QModelIndex& parent = QModelIndex()) const override;
     int rowCount(const QModelIndex& parent = QModelIndex()) const override;
     QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
     Qt::ItemFlags flags(const QModelIndex& index) const override;
 
     void setVariables(const QList<DefaultVariableModel::Variable>& newVars);
     void setFunctions(const QStringList& newFuns);
 
     enum Column
     {
         NameColumn = 0,
         ValueColumn = 1,
         TypeColumn = 2,
         SizeColumn = 3,
         DimensionColumn = 4,
         ColumnCount = 5
     };
 
 private:
 
     DefaultVariableModelPrivate* const d_ptr;
     Q_DECLARE_PRIVATE(DefaultVariableModel)
 };
 
 bool operator==(const Cantor::DefaultVariableModel::Variable& one, const Cantor::DefaultVariableModel::Variable& other);
 
 }
 
 #endif // CANTOR_DEFAULTVARIABLEMODEL_H