/***
    Copyright (C) 2023 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: FileAttrs.Unix.cpp
    Date: 2023-2-4
    Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "FS.hpp"
#include "FileAttrs.Unix.hpp"
#include <sys/types.h>
#include <sys/xattr.h>

namespace Aurora::IO::FS
{
    AUKN_SYM AuList<AuString> FileAttrsList(const AuString &path)
    {
        static const auto kLength = 10 * 1024;
        AuString buffer;

        auto srcPath = NormalizePathRet(path);
        if (srcPath.empty())
        {
            return {};
        }

        if (!AuTryResize(buffer, kLength))
        {
            SysPushErrorMemory();
            return {};
        }

        auto length = ::listxattr(srcPath.c_str(), buffer.data(), buffer.size());
        if (length < 0)
        {
            SysPushErrorIO("Error listing attributes");
            return {};
        }

        if (!AuTryResize(buffer, length))
        {
            SysPushErrorMemory();
            return {};
        }

        return AuSplitString(buffer, "\00");
    }

    AUKN_SYM AuResult<AuByteBuffer> FileAttrsGet(const AuString &path, const AuString &attr)
    {
        AuByteBuffer buffer;

        auto srcPath = NormalizePathRet(path);
        if (srcPath.empty())
        {
            return {};
        }

        auto length = ::getxattr(srcPath.c_str(), attr.c_str(), nullptr, 0);
        if (length < 0)
        {
            SysPushErrorIO("Error reading attribute");
            return {};
        }

        if (!length)
        {
            return AuMove(buffer);
        }

        if (!AuTryResize(buffer, length))
        {
            SysPushErrorMemory();
            return {};
        }

        length = ::getxattr(srcPath.c_str(), attr.c_str(), buffer.base, length);
        if (length < 0)
        {
            SysPushErrorIO("Error reading attribute");
            return {};
        }

        buffer.writePtr += length;

        return AuMove(buffer);
    }

    AUKN_SYM bool FileAttrsSet(const AuString &path, const AuString &attr, const Memory::MemoryViewRead &view)
    {
        auto srcPath = NormalizePathRet(path);
        if (srcPath.empty())
        {
            return false;
        }

        if (::setxattr(srcPath.c_str(), attr.c_str(), view.ptr, view.length, XATTR_CREATE) == -1)
        {
            if (errno == EEXIST)
            {
                if (::setxattr(srcPath.c_str(), attr.c_str(), view.ptr, view.length, XATTR_REPLACE) == -1)
                {
                    SysPushErrorIO();
                    return false;
                }
            }
        }

        return true;
    }

    AUKN_SYM bool FileAttrsDel(const AuString &path, const AuString &attr)
    {
        auto srcPath = NormalizePathRet(path);
        if (srcPath.empty())
        {
            return false;
        }

        return (::removexattr(srcPath.c_str(), attr.c_str()) == 0) ||
               (errno == ENODATA);
    }
}