#pragma once

#include <cstdint>
#include <string>
#include <boost/optional.hpp>

#include "storm/storage/expressions/Variable.h"
#include "storm/storage/expressions/Expression.h"

namespace storm {
    namespace jani {
        
        class BooleanVariable;
        class BoundedIntegerVariable;
        class UnboundedIntegerVariable;
        class RealVariable;
        class ArrayVariable;
        class ClockVariable;
        
        class Variable {
        public:
            /*!
             * Creates a new variable with initial value construct
             */
            Variable(std::string const& name, storm::expressions::Variable const& variable, storm::expressions::Expression const& init, bool transient = false);

            /*!
             * Creates a new variable without initial value construct.
             */
            Variable(std::string const& name, storm::expressions::Variable const& variable);
            
            virtual ~Variable();
            
            /*!
             * Clones the variable.
             */
            virtual std::unique_ptr<Variable> clone() const = 0;
            
            /*!
             * Retrieves the associated expression variable
             */
            storm::expressions::Variable const& getExpressionVariable() const;
            
            /*!
             * Sets the associated expression variable.
             */
            void setExpressionVariable(storm::expressions::Variable const& newVariable);
            
            /*!
             * Retrieves the name of the variable.
             */
            std::string const& getName() const;

            /*!
             * Sets the name of the variable.
             */
            void setName(std::string const& newName);
            
            /*!
             * Retrieves whether an initial expression is set.
             */
            bool hasInitExpression() const;

            /*!
             * Retrieves the initial expression
             * Should only be called if an initial expression is set for this variable.
             *
             * @see hasInitExpression()
             */
            storm::expressions::Expression const& getInitExpression() const;
            
            /*!
             * Sets the initial expression for this variable.
             */
            void setInitExpression(storm::expressions::Expression const& initialExpression);
            
            // Methods to determine the type of the variable.
            virtual bool isBooleanVariable() const;
            virtual bool isBoundedIntegerVariable() const;
            virtual bool isUnboundedIntegerVariable() const;
            virtual bool isRealVariable() const;
            virtual bool isArrayVariable() const;
            virtual bool isClockVariable() const;

            virtual bool isTransient() const;
            
            // Methods to get the variable as a different type.
            BooleanVariable& asBooleanVariable();
            BooleanVariable const& asBooleanVariable() const;
            BoundedIntegerVariable& asBoundedIntegerVariable();
            BoundedIntegerVariable const& asBoundedIntegerVariable() const;
            UnboundedIntegerVariable& asUnboundedIntegerVariable();
            UnboundedIntegerVariable const& asUnboundedIntegerVariable() const;
            RealVariable& asRealVariable();
            RealVariable const& asRealVariable() const;
            ArrayVariable& asArrayVariable();
            ArrayVariable const& asArrayVariable() const;
            ClockVariable& asClockVariable();
            ClockVariable const& asClockVariable() const;
            
            /*!
             * Substitutes all variables in all expressions according to the given substitution.
             */
            virtual void substitute(std::map<storm::expressions::Variable, storm::expressions::Expression> const& substitution);

        private:
            // The name of the variable.
            std::string name;
            
            // The expression variable associated with this variable.
            storm::expressions::Variable variable;

            /// Whether this is a transient variable.
            bool transient;

            /// Expression for initial values
            boost::optional<storm::expressions::Expression> init;
        };

        bool operator==(Variable const& lhs, Variable const& rhs);
        bool operator!=(Variable const& lhs, Variable const& rhs);
        
    }
}