// This file is distributed under the BSD License.
// See "license.txt" for details.
// Copyright 2009-2012, Jonathan Turner (jonathan@emptycrate.com)
// Copyright 2009-2018, Jason Turner (jason@emptycrate.com)
// http://www.chaiscript.com

#ifndef CHAISCRIPT_POSIX_HPP_
#define CHAISCRIPT_POSIX_HPP_

namespace chaiscript::detail {
  struct Loadable_Module {
    struct DLModule {
      explicit DLModule(const std::string &t_filename)
          : m_data(dlopen(t_filename.c_str(), RTLD_NOW)) {
        if (m_data == nullptr) {
          throw chaiscript::exception::load_module_error(dlerror());
        }
      }

      DLModule(DLModule &&) = default;
      DLModule &operator=(DLModule &&) = default;
      DLModule(const DLModule &) = delete;
      DLModule &operator=(const DLModule &) = delete;

      ~DLModule() { dlclose(m_data); }

      void *m_data;
    };

    template<typename T>
    struct DLSym {
      DLSym(DLModule &t_mod, const std::string &t_symbol)
          : m_symbol(reinterpret_cast<T>(dlsym(t_mod.m_data, t_symbol.c_str()))) {
        if (!m_symbol) {
          throw chaiscript::exception::load_module_error(dlerror());
        }
      }

      T m_symbol;
    };

    Loadable_Module(const std::string &t_module_name, const std::string &t_filename)
        : m_dlmodule(t_filename)
        , m_func(m_dlmodule, "create_chaiscript_module_" + t_module_name)
        , m_moduleptr(m_func.m_symbol()) {
    }

    DLModule m_dlmodule;
    DLSym<Create_Module_Func> m_func;
    ModulePtr m_moduleptr;
  };
} // namespace chaiscript::detail
#endif