/*
 * Copyright (c) 2025, Tomasz Strejczek
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <AK/ByteString.h>
#include <AK/StringView.h>

#include <Windows.h>
#include <dbghelp.h>

#pragma comment(lib, "dbghelp.lib") // /DELAYLOAD:dbghelp.dll is configured in CMakeLists.txt

#include <AK/Demangle.h>

namespace AK {

ByteString demangle(StringView name)
{
    // The buffer size is arbitrary but should be large enough for most cases.
    // Unfortunately, there is no way to know the exact size needed beforehand.
    // Also calling UnDecorateSymbolName with a too small buffer will not return an error, it will just truncate the result.
    char buffer[4096] = {};

    // UNDNAME_COMPLETE asks for the full decoration (equivalent to the Itanium demangle method in libgcc/libcxxabi)
    auto chars_written = UnDecorateSymbolName(name.to_byte_string().characters(), buffer, sizeof(buffer), UNDNAME_COMPLETE);

    return ByteString(chars_written > 0 ? StringView { buffer, static_cast<size_t>(chars_written) } : name);
}

} // namespace AK