#include "dll_loader.hpp"
#include <stdexcept>

namespace Basalt::Presenter {

    DllLoader::DllLoader(DllKind kind, const std::basic_string_view<BSCHAR> filename) {
        // TODO:
        // Add current executable location supports.
        // Add sub directories supports.
        // Fix file name terminal error.
#if defined(BASALT_OS_WINDOWS)
        m_Handle = LoadLibraryW(filename.data());
#else
        m_Handle = dlopen(filename.data(), RTLD_LAZY);
#endif
        if (!m_Handle) throw std::runtime_error("Can not load given dynamic library.");
    }

    DllLoader::~DllLoader() {
        if (m_Handle) {
#if defined(BASALT_OS_WINDOWS)
            FreeLibrary(m_Handle);
#else
            dlclose(m_Handle);
#endif
        }
    }

    void *DllLoader::GetFunctionPointer(const char *name) {
        if (!m_Handle) throw std::runtime_error("Can not fetch function pointer on not loaded dynamic library.");
#if defined(BASALT_OS_WINDOWS)
        return (void *) GetProcAddress(m_Handle, name);
#else
        return (void *) dlsym(m_Handle, name);
#endif
    }

} // namespace Basalt::Presenter