/***
    Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: AuUTF32.hpp
    Date: 2021-10-31
    Author: Reece
***/
#pragma once

namespace Aurora::Locale::Encoding::UTF32
{
    static void SwapU32(void *base, AuUInt32 count)
    {
        count *= 4;
        for (AuUInt32 i = 0; i < count; i += 4)
        {
            AuWriteU32BE(base, i, AuReadU32LE(base, i));
        }
    }
    
    static AuUInt32 Count32(const void *base, AuUInt32 length, bool bytes = false)
    {
        return bytes ? length & ~3 : (length & ~3) / 4;
    }

    static AuStreamReadWrittenPair_t UTF8ToCp(const AuMemoryViewRead &utf8, const AuMemoryViewWrite &utf32)
    {
        const char *begin = utf8.Begin<const char>();
        const char *end   = utf8.End<const char>();
        
        AuUInt32 *begin2 = utf32.Begin<AuUInt32>();
        AuUInt32 *end2   = utf32.End<AuUInt32>();
        
        UTF8::ReadUtf8ByteString(begin2, end2, begin, end);
        return AuStreamReadWrittenPair_t {begin - utf8.Begin<const char>(), (begin2 - utf32.Begin<AuUInt32>()) * sizeof(AuUInt32)};
    }

    static AuStreamReadWrittenPair_t CPToUTF8(const AuMemoryViewRead &utf32, const AuMemoryViewWrite &utf8)
    {
        const AuUInt32 *begin = utf32.Begin<const AuUInt32>();
        const AuUInt32 *end   = utf32.End<const AuUInt32>();
        
        char *dest    = utf8.Begin<char>();
        char *destEnd = utf8.End<char>();

        AuUInt32 counter {};
        const AuUInt32 *cur = begin;
        for (; cur < end; cur++)
        {
            UTF8::WriteCp(*cur, dest, counter, destEnd - dest);
        }

        return AuStreamReadWrittenPair_t {(cur - begin) * sizeof(AuUInt32), dest - utf8.Begin<char>()};
    }
}