PluginManager.h

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// Copyright (c) 2025 Dave R. Smith. All rights reserved.
// Malena Framework — Proprietary Software. See LICENSE for terms.
 
//
// PluginManager.h
//
 
#ifndef MALENA_PLUGINHOST_H
#define MALENA_PLUGINHOST_H
 
#include <Malena/Core/malena_export.h>
#include <Malena/Engine/App/Application.h>
#include <Malena/Engine/Plugins/Plugin.h>
#include <Malena/Core/DeferredOperationsManager.h>
#include <Malena/Engine/Plugins/PluginInfo.h>
 
#ifdef _WIN32
    #include <windows.h>
    #define LIB_HANDLE HMODULE
    #define LOAD_LIB(path)        LoadLibraryA(path)
    #define GET_FUNC(handle,name) GetProcAddress(handle, name)
    #define CLOSE_LIB(handle)     FreeLibrary(static_cast<HMODULE>(handle))
#else
    #include <dlfcn.h>
    #define LIB_HANDLE void*
    #define LOAD_LIB(path)        dlopen(path, RTLD_NOW | RTLD_GLOBAL)
    #define GET_FUNC(handle,name) dlsym(handle, name)
    #define CLOSE_LIB(handle)     dlclose(handle)
#endif
 
namespace fs = std::filesystem;
 
namespace ml
{
    class MALENA_API PluginManager : public DeferredOperationsManager<PluginManager>
    {
        struct PluginData
        {
            Plugin*    plugin;
            LIB_HANDLE handle;
        };
 
        std::vector<PluginData>  _plugins;
 
        std::vector<std::string> getPluginFiles(const std::string& directory);
        std::vector<std::string> getFilesInDirectory(const std::string& directory,
                                                      const std::string& extension = "");
 
    public:
        PluginManager(const std::string& pluginPath = "");

        Plugin* loadPlugin(const std::string& path);

        void loadPluginsFromDirectory(const std::string& dir);

        std::vector<Plugin*> getPlugins();

        void unloadPlugin(Plugin* plugin);

        std::vector<PluginInfo> scanPlugins(const std::string& dir);
 
    private:
        void doUnloadPlugin(Plugin* plugin);
    };
 
} // namespace ml
 
#endif // MALENA_PLUGINHOST_H