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 /*
     SPDX-License-Identifier: GPL-2.0-or-later
     SPDX-FileCopyrightText: 2009 Alexander Rieder <alexanderrieder@gmail.com>
 */
 
 #ifndef _EXTENSION_H
 #define _EXTENSION_H
 
 #include <QObject>
 #include <QPair>
 #include <QVector>
 #include <QDebug>
 #include <QWidget>
 #include "cantor_export.h"
 
 namespace Cantor
 {
 /**
  * This is the base class for all Extensions.
  * An Extension provides a set of Methods to
  * accomplish specific tasks. This is used to
  * abstract away the backends syntax for common
  * tasks like solving equations etc. to be able
  * to provide Backend independent Dialogs
  *
  * @author Alexander Rieder
  */
 class CANTOR_EXPORT Extension : public QObject
 {
   Q_OBJECT
   public:
     ///Default constructor
     Extension( const QString& name, QObject* parent );
     ~Extension() override = default;
 };
 
 
 //Some basic interfaces for extensions
 
 /**
  * An Extension providing commands for command history
  */
 class CANTOR_EXPORT HistoryExtension : public Extension
 {
   Q_OBJECT
   public:
     explicit HistoryExtension(QObject* parent);
     ~HistoryExtension() override;
   public Q_SLOTS:
     /**
      * Returns a command that retrieves the last result
      * @return command that retrieves the last result
      */
     virtual QString lastResult() = 0;
 };
 
 /**
  * An Extension providing commands to interact
  * with external scripts
  */
 class CANTOR_EXPORT ScriptExtension : public Extension
 {
   Q_OBJECT
   public:
     explicit ScriptExtension(QObject* parent);
     ~ScriptExtension() override;
   public Q_SLOTS:
     /**
      * returns the command for running a script
      * @param path path to the script file
      * @return command for running a script
      */
     virtual QString runExternalScript(const QString& path) = 0;
     /**
      * returns the file filter used for Script Files (e.g. *.py)
      * @return file filter used for Script Files (e.g. *.py)
      */
     virtual QString scriptFileFilter() = 0;
     /**
      * returns the name of the language to use for syntax highlighting
      * in the script editor (e.g. python). The value returned must match
      * the name attribute from the xml language description in KTexteditor.
      * @return name of the language to use for syntax highlighting (e.g. python)
      */
     virtual QString highlightingMode() = 0;
     /**
      * returns a string used to separate commands (usually ;)
      * @return a string used to separate commands (usually ;)
      */
     virtual QString commandSeparator();
     /**
      * returns a string used to start a comment (usually #)
      * @return a string used to start a comment (usually #)
      */
     virtual QString commentStartingSequence();
     /**
      * returns a string used to end a comment (usually "")
      * @return a string used to end a comment (usually "")
      */
     virtual QString commentEndingSequence();
 };
 
 /**
  * An extension providing the basic computations
  * in computer algebra, like solving, simplifying
  * etc
 **/
 class CANTOR_EXPORT CASExtension : public Extension
 {
   Q_OBJECT
   public:
     explicit CASExtension(QObject* parent);
     ~CASExtension() override;
 
   public Q_SLOTS:
     /**
      * returns the command for solving a set of equations
      * @param equations a list of equations
      * @param variables a list of variables that should be solved for
      * @return command for solving a set of equations
      */
     virtual QString solve(const QStringList& equations, const QStringList& variables) = 0;
     /**
      * returns the command for simplifying an expression
      * @param expression the expression that should be simplified
      * @return command for simplifying the expression
      */
     virtual QString simplify(const QString& expression) = 0;
     /**
      * returns the command for expanding an expression
      * @param expression the expression that should be expanded
      * @return command for expanded the expression
      */
     virtual QString expand(const QString& expression) = 0;
 };
 
 /**
  * An extension providing the basic calculus
  * stuff like limits, differentiate, integrate etc.
  */
 class CANTOR_EXPORT CalculusExtension : public Extension
 {
   Q_OBJECT
   public:
     explicit CalculusExtension(QObject* parent);
     ~CalculusExtension() override;
 
   public Q_SLOTS:
     /**
      * returns the command for calculating a limit if an expression
      * @param expression the expression
      * @param variable the variable
      * @param limit the value, the variable approaches
      * @return the limit of the expression
      */
     virtual QString limit(const QString& expression, const QString& variable, const QString& limit) = 0;
     /**
      * returns the command for calculating a differential
      * @param function the function
      * @param variable the variable, after which should be differentiated
      * @param times how often should be differentiated
      * @return the command to compute the differential
      */
     virtual QString differentiate(const QString& function,const QString& variable, int times) = 0;
     /**
      * returns the command for calculating an integral
      * @param function the function
      * @param variable the variable, after which should be integrated
      * @return the command to compute the integrate
      */
     virtual QString integrate(const QString& function, const QString& variable) = 0;
     /**
      * returns the command for calculating a definite integral
      * @param function the function
      * @param variable the variable, after which should be integrated
      * @param left the left border of the integral
      * @param right the right border of the integral
      * @return the command to compute the integrate
      */
     virtual QString integrate(const QString& function,const QString& variable, const QString& left, const QString& right) = 0;
 };
 
 /**
  * An extension providing basic plotting facilities
  */
 class CANTOR_EXPORT PlotExtension : public Extension
 {
   Q_OBJECT
   public:
     typedef QPair<QString,QString> Interval;
     typedef QPair<QString, Interval> VariableParameter;
 
     explicit PlotExtension(QObject* parent);
     ~PlotExtension() override;
 
   public Q_SLOTS:
     /**
      * returns the command for plotting a 2 dimensional function.
      * @param function the function to plot
      * @param variable the variable
      * @param left the left border of the plot
      * @param right the right border of the plot
      * @return the command for plotting
      */
     virtual QString plotFunction2d(const QString& function, const QString& variable, const QString& left, const QString& right) = 0;
     /**
      * returns the command for plotting a 3 dimensional function.
      * @param function the function to plot
      * @param var1 the parameters for Variable1 (name, interval)
      * @param var2 the parameters for Variable2 (name, interval)
      * @return the command for plotting
      */
     virtual QString plotFunction3d(const QString& function, const VariableParameter& var1, const VariableParameter& var2) = 0;
 };
 
 #define PLOT_DIRECTIVE_DISPATCHING(x) QString dispatch(const Cantor::AdvancedPlotExtension::AcceptorBase& acc) const \
   { \
     const Cantor::AdvancedPlotExtension::DirectiveAcceptor<x>* adaptor= \
         dynamic_cast<const Cantor::AdvancedPlotExtension::DirectiveAcceptor<x>*>(&acc); \
     if (adaptor==NULL) { qDebug()<<"Backend incapable of processing directives of type "#x;  return QLatin1String(""); } \
     else \
         return adaptor->accept(*this); \
  }
 
 /**
  * An extension providing advanced plotting facilities. Will supersede PlotExtension
  */
 class CANTOR_EXPORT AdvancedPlotExtension : public Extension
 {
   Q_OBJECT
   public:
     explicit AdvancedPlotExtension(QObject* parent);
     ~AdvancedPlotExtension() override;
 
     // TODO comment
 
     class PlotDirective;
 
     // TODO move the hell out of here
     class CANTOR_EXPORT DirectiveProducer : public QWidget
     {
         public:
             explicit DirectiveProducer(QWidget* parent);
             virtual PlotDirective* produceDirective() const=0;
     };
 
     template <class UI> class DirectiveControl : protected UI, public DirectiveProducer
     {
         public:
             DirectiveControl(QWidget* parent) : DirectiveProducer(parent) { UI::setupUi(this); }
         protected:
             using AbstractParent = DirectiveControl<UI>;
     };
 
     class CANTOR_EXPORT AcceptorBase
     {
         public:
             /**
              * utilitary typename for easing the code
              */
             using widgetProc = DirectiveProducer *(*)(QWidget *);
 
             /**
              * returns a constant reference to the list of widget generating procedures
              * which contains means of creating all the widgets a backend knows how to process
              * @return the constant reference to a QVector of QWidget* (*)(QWidget*) pointers
              */
             const QVector<widgetProc>& widgets() const;
 
         protected:
             /**
              * constructor only allowed for derived classes
              **/
             AcceptorBase();
             virtual ~AcceptorBase() = default;
 
             QVector<widgetProc> m_widgets;
     };
 
     template <class Directive> class DirectiveAcceptor : virtual public AcceptorBase
     {
 
         public:
             /**
              * virtual interface to acceptor function mechanics
              * @param directive the directive to process
              * @return the parameter corresponding the directive
              */
             virtual QString accept(const Directive& directive) const=0;
 
         protected:
             /**
              * constructor only allowed for derived classes
              **/
             DirectiveAcceptor();
     };
 
     class CANTOR_EXPORT PlotDirective
     {
         public:
             virtual ~PlotDirective() = default;
 
             /**
              * creates a new widget for editing the value and returns the pointer to it
              * @param parent the pointer to parent widget passed to newly created widget
              * @return pointer to the newly-created widget
              */
             static QWidget* widget(QWidget* parent);
 
             /**
              * in order to make dual dispatching this should be present in any derived class
              * without virtual keyword and with correct class name
              **/
             virtual PLOT_DIRECTIVE_DISPATCHING(PlotDirective);
             // TODO: find a workaround not to put class names manually
 
         protected:
             /**
              * only derived classes may construct
              **/
             PlotDirective() = default;
     };
 
   public Q_SLOTS:
     /**
      * returns the command for plotting a 2 dimensional data set.
      * @param expression the expression to plot
      * @param directives the array of directives toward the generator
      * @return the command for plotting
      */
     QString plotFunction2d(const QString& expression, const QVector<Cantor::AdvancedPlotExtension::PlotDirective*>& directives) const;
 
     /**
      * returns the parameter expression according to a directive.
      * @param directive the directive toward the generator
      * @return the parameter for plotting
      */
     QString dispatchDirective(const Cantor::AdvancedPlotExtension::PlotDirective& directive) const;
 
   protected:
     /**
      * returns the command name for plotting a 2 dimensional data set.
      * @return the command for plotting
      */
     virtual QString plotCommand() const=0;
     /**
      * returns the separator symbol in a plotting command.
      * @return the separator symbol or string
      */
     virtual QString separatorSymbol() const;
 };
 
 template <class Directive> AdvancedPlotExtension::DirectiveAcceptor<Directive>::DirectiveAcceptor()
 {
     m_widgets.push_back(&Directive::widget);
 }
 
 /**
  * An extension for basic Linear Algebra
  */
 class CANTOR_EXPORT LinearAlgebraExtension : public Extension
 {
   Q_OBJECT
   public:
     enum VectorType { ColumnVector, RowVector };
     using Matrix = QList<QStringList>;
 
     explicit LinearAlgebraExtension(QObject* parent);
     ~LinearAlgebraExtension() override;
 
   public Q_SLOTS:
     //Commands to create Vectors/Matrices
     /**
      * creates a vector with the given entries
      * @param entries the entries of the new vector
      * @param type the type of the vector (row/column)
      * @return the command for creating the vector
      */
     virtual QString createVector(const QStringList& entries, Cantor::LinearAlgebraExtension::VectorType type) = 0;
     /**
      * creates a null vector, of the given size/type
      * @param size size of the vector
      * @param type type of the vector
      * @return the command used for creating a nullvector
      **/
     virtual QString nullVector(int size, Cantor::LinearAlgebraExtension::VectorType type);
     /**
      * creates a matrix with the given entries
      * @param matrix the entries of the matrix
      * @return the command to create this matrix
      */
     virtual QString createMatrix(const Matrix& matrix) = 0;
     /**
      * creates an identity matrix of the given size
      * @param size size of the matrix
      * @return the command used to create the matrix
      */
     virtual QString identityMatrix(int size);
     /**
      * creates a null matrix, of the given size
      * @param rows number of rows
      * @param columns number of columns
      * @return the command to create this matrix
      */
     virtual QString nullMatrix(int rows,int columns);
 
     //basic functions
     /**
      * compute the rank of a matrix
      * @param matrix the name of the matrix, the rank should be computed of
      * @return the command for calculating the rank
      */
     virtual QString rank(const QString& matrix) = 0;
     /**
      * invert a given matrix
      * @param matrix the name of the matrix, that should be inverted
      * @return the command for inverting the matrix
      */
     virtual QString invertMatrix(const QString& matrix) = 0;
     /**
      * calculate the characteristic polynom of a matrix
      * @param matrix the name of the matrix, the charpoly should be computed of
      * @return the command
      */
     virtual QString charPoly(const QString& matrix) = 0;
     /**
      * calculate the eigen vectors of a matrix
      * @param matrix the name of the matrix, the eigenvectors should be computed of
      * @return the command
      */
     virtual QString eigenVectors(const QString& matrix) = 0;
     /**
      * calculate the eigen values of a matrix
      * @param matrix the name of the matrix, the eigenvalues should be computed of
      * @return the command
      */
     virtual QString eigenValues(const QString& matrix) = 0;
 
 };
 
 class CANTOR_EXPORT VariableManagementExtension : public Extension
 {
   Q_OBJECT
   public:
     explicit VariableManagementExtension( QObject* parent );
     ~VariableManagementExtension() override;
 
   public Q_SLOTS:
     virtual QString addVariable(const QString& name, const QString& value) = 0;
     virtual QString setValue(const QString& name,const QString& value) = 0;
     virtual QString removeVariable(const QString& name) = 0;
 
     virtual QString saveVariables(const QString& fileName) = 0;
     virtual QString loadVariables(const QString& fileName) = 0;
     virtual QString clearVariables() = 0;
 };
 
 /**
  * An extension for library/module import
  */
 class CANTOR_EXPORT PackagingExtension : public Extension
 {
   Q_OBJECT
   public:
     explicit PackagingExtension(QObject* parent);
     ~PackagingExtension() override;
 
   public Q_SLOTS:
     /**
      * import library/module
      * @param package the library/module name
      * @return the command for import library/module
      */
     virtual QString importPackage(const QString& package) = 0;
 };
 
 }
 #endif /* _EXTENSION_H */