// native_bridge/include/VstDllSearch.h
// iZotope VST3 (Ozone 11, Nectar, Neutron...) là single-file .vst3 — core
// DLL (vd iZOzone11Core.dll) nằm RIÊNG ở
//   C:\Program Files\iZotope\<Product>\Cores
// KHÔNG cạnh plugin → LoadLibraryW của VST3 SDK fail ERROR_MOD_NOT_FOUND
// (0x7E) dù setPluginSearchPath đã trỏ dir cạnh plugin. Helper này quét các
// dir Cores cố định và thêm vào PATH (process-global — bridge load 1 plugin
// 1 lúc, giống SetDllDirectoryW hiện có).
#ifndef VST_DLL_SEARCH_H
#define VST_DLL_SEARCH_H

#include <string>
#ifdef _WIN32
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <windows.h>
#endif

#ifdef _WIN32
inline std::string vstDllSearchExtras() {
    std::string extras;
    const char* bases[] = {
        "C:\\Program Files\\iZotope",
        "C:\\Program Files\\Common Files\\iZotope",
    };
    for (const char* base : bases) {
        std::string pat = std::string(base) + "\\*";
        WIN32_FIND_DATAA fd;
        HANDLE h = FindFirstFileA(pat.c_str(), &fd);
        if (h == INVALID_HANDLE_VALUE) continue;
        do {
            if (!(fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) continue;
            if (fd.cFileName[0] == '.') continue;
            std::string cores = std::string(base) + "\\" + fd.cFileName + "\\Cores";
            if (GetFileAttributesA(cores.c_str()) != INVALID_FILE_ATTRIBUTES) {
                if (!extras.empty()) extras += ";";
                extras += cores;
            }
        } while (FindNextFileA(h, &fd));
        FindClose(h);
    }
    return extras;
}

// Append extras vào PATH (bỏ dir đã có). Gọi TRƯỚC Module::create.
inline void vstAddDllSearchPath(const std::string& extras) {
    if (extras.empty()) return;
    char buf[32768];
    DWORD n = GetEnvironmentVariableA("PATH", buf, sizeof(buf));
    std::string path = n ? std::string(buf) : "";
    std::string toAdd;
    size_t start = 0;
    while (start <= extras.size()) {
        size_t end = extras.find(';', start);
        std::string dir = extras.substr(start, end == std::string::npos ? std::string::npos : end - start);
        if (!dir.empty() && path.find(dir) == std::string::npos) {
            if (!toAdd.empty()) toAdd += ";";
            toAdd += dir;
        }
        if (end == std::string::npos) break;
        start = end + 1;
    }
    if (toAdd.empty()) return;
    if (!path.empty()) path += ";";
    path += toAdd;
    SetEnvironmentVariableA("PATH", path.c_str());
}
#else
inline std::string vstDllSearchExtras() { return std::string(); }
inline void vstAddDllSearchPath(const std::string&) {}
#endif

#endif // VST_DLL_SEARCH_H