#pragma once

#include <istream>
#include <streambuf>

#ifdef _WIN32
#include <iostream>
#endif

namespace fsh::util {

    /** 
 * Applies some settings to terminals to fix some inconsistencies between
 * windows and linux terminals
 * 
 * * **Windows** : it enables using ansii characters
 * * **Linux** : it enables [Noncanonical Mode](https://www.gnu.org/software/libc/manual/html_node/Noncanonical-Input.html)
 */
    void prepTerminal();

#ifndef _WIN32

    class CursorIStreamBuffer : public std::streambuf {
      public:
        enum EscapeSequence {
            FAILED,
            POSSIBLE,
            LEFT_ARROW,
            RIGHT_ARROW
        };

        CursorIStreamBuffer() : valid(0), read_chars(0), cursor_pos(0), buffer() { setg(buffer, buffer, buffer); }

      protected:
        int underflow() override;
        // int uflow() override;
        // std::streamsize xsgetn(char* s, std::streamsize n) override;

      private:
        int            valid;
        EscapeSequence testForEscapeCodes(char chr);

        int         readInputToNewLine();
        std::string input;
        int         read_chars;
        int         cursor_pos;
        char        buffer[32];
    };

    class CursorIStream : public std::istream {
      public:
        CursorIStream() : std::istream(&buffer) {}

      private:
        CursorIStreamBuffer buffer;
    };
    extern CursorIStream cin;

#else

    extern std::istream& cin;

#endif

}