#ifndef INTERPRETER_RUNTIME_H_INCLUDED
#define INTERPRETER_RUNTIME_H_INCLUDED

#include <string_view>
#include <vector>

#include "types.hpp"

namespace Interpreter
{
    class Context;

    /// Runtime data and engine interface

    class Runtime
    {
        Context* mContext;
        const Type_Code* mCode;
        int mCodeSize;
        int mPC;
        std::vector<Data> mStack;

    public:
        Runtime();

        int getPC() const;
        ///< return program counter.

        int getIntegerLiteral(int index) const;

        float getFloatLiteral(int index) const;

        std::string_view getStringLiteral(int index) const;

        void configure(const Type_Code* code, int codeSize, Context& context);
        ///< \a context and \a code must exist as least until either configure, clear or
        /// the destructor is called. \a codeSize is given in 32-bit words.

        void clear();

        void setPC(int PC);
        ///< set program counter.

        void push(const Data& data);
        ///< push data on stack

        void push(Type_Integer value);
        ///< push integer data on stack.

        void push(Type_Float value);
        ///< push float data on stack.

        void pop();
        ///< pop stack

        Data& operator[](int Index);
        ///< Access stack member, counted from the top.

        Context& getContext();
    };
}

#endif