// native_bridge/include/FxShm.h
// openShm/closeShm dùng chung giữa RealtimeFxLoop.cpp (fx_vst_bridge
// --realtime-fx) và juce_fx/JuceFxLoop.cpp (juce_fx_bridge --juce-fx).
// Windows-only (FileMapping); mở mapping có sẵn do engine (Python) tạo.
#pragma once
#ifdef _WIN32
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <windows.h>
#endif

#include <string>

namespace fxshm {

struct ShmView {
    void* map = nullptr;
    void* view = nullptr;
};

inline ShmView* openShm(const std::string& name, size_t size) {
#ifdef _WIN32
    int wlen = MultiByteToWideChar(CP_UTF8, 0, name.c_str(), -1, nullptr, 0);
    std::wstring wname(wlen, L'\0');
    MultiByteToWideChar(CP_UTF8, 0, name.c_str(), -1, &wname[0], wlen);
    HANDLE map = OpenFileMappingW(FILE_MAP_ALL_ACCESS, FALSE, wname.c_str());
    if (!map) return nullptr;
    void* view = MapViewOfFile(map, FILE_MAP_ALL_ACCESS, 0, 0, size);
    if (!view) { CloseHandle(map); return nullptr; }
    ShmView* v = new ShmView();
    v->map = map;
    v->view = view;
    return v;
#else
    (void)name; (void)size;
    return nullptr;
#endif
}

inline void closeShm(ShmView* v) {
    if (!v) return;
#ifdef _WIN32
    if (v->view) UnmapViewOfFile(v->view);
    if (v->map) CloseHandle((HANDLE)v->map);
#endif
    delete v;
}

}  // namespace fxshm