/*
Copyright (c) 2020 - present Advanced Micro Devices, Inc. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#ifndef AMD_SMI_INCLUDE_IMPL_AMD_SMI_LIB_LOADER_H_
#define AMD_SMI_INCLUDE_IMPL_AMD_SMI_LIB_LOADER_H_
#include <dlfcn.h>
#include <string.h>
#include <map>
#include <iostream>
#include <mutex>   //  NOLINT(build/c++11)
#include "amd_smi/amdsmi.h"


namespace amd {
namespace smi {
class AMDSmiLibraryLoader {
 public:
     AMDSmiLibraryLoader();

     amdsmi_status_t load(const char* filename);

     template<typename T> amdsmi_status_t load_symbol(T* func_handler,
            const char* func_name);


     amdsmi_status_t unload();

     ~AMDSmiLibraryLoader();

 private:
     void* libHandler_;
     std::mutex library_mutex_;
};

template<typename T> amdsmi_status_t AMDSmiLibraryLoader::load_symbol(
            T* func_handler,
            const char* func_name) {
    if (!libHandler_) {
        return AMDSMI_STATUS_FAIL_LOAD_MODULE;
    }

    if (!func_handler || !func_name) {
        return AMDSMI_STATUS_FAIL_LOAD_SYMBOL;
    }

    std::lock_guard<std::mutex> guard(library_mutex_);

    *reinterpret_cast<void**>(func_handler) =
            dlsym(libHandler_, func_name);
    if (*func_handler == nullptr) {
        char* error = dlerror();
        std::cerr << "AMDSmiLibraryLoader: Fail to load the symbol "
                    << func_name << ": " << error << std::endl;
        return AMDSMI_STATUS_FAIL_LOAD_SYMBOL;
    }

    return AMDSMI_STATUS_SUCCESS;
}

}  // namespace smi
}  // namespace amd


#endif  // AMD_SMI_INCLUDE_IMPL_AMD_SMI_LIB_LOADER_H_