#include <console/ConsoleUtils.h>
#include <TiltedCore/Stl.hpp>

namespace Console
{
bool CheckIsValidUTF8(const TiltedPhoques::String& string)
{
    size_t c, i, ix, n, j;
    for (i = 0, ix = string.length(); i < ix; i++)
    {
        c = static_cast<unsigned char>(string[i]);
        // if (c==0x09 || c==0x0a || c==0x0d || (0x20 <= c && c <= 0x7e) ) n = 0; // is_printable_ascii
        if (0x00 <= c && c <= 0x7f)
            n = 0; // 0bbbbbbb
        else if ((c & 0xE0) == 0xC0)
            n = 1; // 110bbbbb
        else if (c == 0xed && i < (ix - 1) && (static_cast<unsigned char>(string[i + 1]) & 0xa0) == 0xa0)
            return false; // U+d800 to U+dfff
        else if ((c & 0xF0) == 0xE0)
            n = 2; // 1110bbbb
        else if ((c & 0xF8) == 0xF0)
            n = 3; // 11110bbb
        // else if (($c & 0xFC) == 0xF8) n=4; // 111110bb //byte 5, unnecessary in 4 byte UTF-8
        // else if (($c & 0xFE) == 0xFC) n=5; // 1111110b //byte 6, unnecessary in 4 byte UTF-8
        else
            return false;
        for (j = 0; j < n && i < ix; j++)
        { // n bytes matching 10bbbbbb follow ?
            if ((++i == ix) || ((static_cast<unsigned char>(string[i]) & 0xC0) != 0x80))
                return false;
        }
    }
    return true;
}
} // namespace Console