//
// Copyright 2015 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//

#include <uhd/error.h>
#include <uhd/exception.hpp>
#include <uhd/utils/static.hpp>
#include <cstring>
#include <mutex>

#define MAP_TO_ERROR(exception_type, error_type)     \
    if (dynamic_cast<const uhd::exception_type*>(e)) \
        return error_type;

uhd_error error_from_uhd_exception(const uhd::exception* e)
{
    MAP_TO_ERROR(index_error, UHD_ERROR_INDEX)
    MAP_TO_ERROR(key_error, UHD_ERROR_KEY)
    MAP_TO_ERROR(not_implemented_error, UHD_ERROR_NOT_IMPLEMENTED)
    MAP_TO_ERROR(usb_error, UHD_ERROR_USB)
    MAP_TO_ERROR(io_error, UHD_ERROR_IO)
    MAP_TO_ERROR(os_error, UHD_ERROR_OS)
    MAP_TO_ERROR(assertion_error, UHD_ERROR_ASSERTION)
    MAP_TO_ERROR(lookup_error, UHD_ERROR_LOOKUP)
    MAP_TO_ERROR(type_error, UHD_ERROR_TYPE)
    MAP_TO_ERROR(value_error, UHD_ERROR_VALUE)
    MAP_TO_ERROR(runtime_error, UHD_ERROR_RUNTIME)
    MAP_TO_ERROR(environment_error, UHD_ERROR_ENVIRONMENT)
    MAP_TO_ERROR(system_error, UHD_ERROR_SYSTEM)

    return UHD_ERROR_EXCEPT;
}

// Store the error string in a single place in library
// Note: Don't call _c_global_error_string() directly, it needs to be locked
// for thread-safety. Use set_c_global_error_string() and
// get_c_global_error_string() instead.
UHD_SINGLETON_FCN(std::string, _c_global_error_string)

static std::mutex _error_c_mutex;

std::string get_c_global_error_string()
{
    std::lock_guard<std::mutex> lock(_error_c_mutex);
    return _c_global_error_string();
}

void set_c_global_error_string(const std::string& msg)
{
    std::lock_guard<std::mutex> lock(_error_c_mutex);
    _c_global_error_string() = msg;
}

uhd_error uhd_get_last_error(char* error_out, size_t strbuffer_len)
{
    try {
        auto error_str = get_c_global_error_string();
        memset(error_out, '\0', strbuffer_len);
        strncpy(error_out, error_str.c_str(), strbuffer_len);
    } catch (...) {
        return UHD_ERROR_UNKNOWN;
    }
    return UHD_ERROR_NONE;
}