#ifndef DRW_TEXTCODEC_H
#define DRW_TEXTCODEC_H

#include <string>
#include <memory>

class DRW_Converter;

class DRW_TextCodec
{
public:
    DRW_TextCodec();
    ~DRW_TextCodec();
    std::string fromUtf8(const std::string& s);
    std::string toUtf8(const std::string &s);
    int getVersion(){return version;}
    void setVersion(const std::string &versionStr, bool dxfFormat);
    void setVersion(int v, bool dxfFormat);
    void setCodePage(const std::string &c, bool dxfFormat);
    std::string getCodePage(){return cp;}

private:
    std::string correctCodePage(const std::string& s);

private:
    int version;
    std::string cp;
    std::unique_ptr< DRW_Converter> conv;
};

class DRW_Converter
{
public:
    DRW_Converter(const int *t, int l)
        :table{t }
        ,cpLength{l}
    {}
    virtual ~DRW_Converter()=default;
    virtual std::string fromUtf8(const std::string &s) {return s;}
    virtual std::string toUtf8(const std::string &s);
    std::string encodeText(const std::string& stmp);
    std::string decodeText(int c);
    std::string encodeNum(int c);
    int decodeNum(const std::string& s, int *b);
    const int *table{nullptr};
    int cpLength;
};

class DRW_ConvUTF16 : public DRW_Converter {
public:
    DRW_ConvUTF16():DRW_Converter(nullptr, 0) {}
    std::string fromUtf8(const std::string &s) override;
    std::string toUtf8(const std::string &s) override;
};

class DRW_ConvTable : public DRW_Converter {
public:
    DRW_ConvTable(const int *t, int l):DRW_Converter(t, l) {}
    std::string fromUtf8(const std::string &s) override;
    std::string toUtf8(const std::string &s) override;
};

class DRW_ConvDBCSTable : public DRW_Converter {
public:
    DRW_ConvDBCSTable(const int *t,  const int *lt, const int dt[][2], int l)
        :DRW_Converter(t, l)
        ,leadTable{lt}
        ,doubleTable{dt}
    {}

    std::string fromUtf8(const std::string &s) override;
    std::string toUtf8(const std::string &s) override;
private:
    const int *leadTable{nullptr};
    const int (*doubleTable)[2];

};

class DRW_Conv932Table : public DRW_Converter {
public:
    DRW_Conv932Table();
    std::string fromUtf8(const std::string &s) override;
    std::string toUtf8(const std::string &s) override;

};

#endif // DRW_TEXTCODEC_H