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/*! \internal \file
 * \brief
 * Implements functions in strconvert.h.
 *
 * \author Teemu Murtola <teemu.murtola@gmail.com>
 * \ingroup module_utility
 */
#include "gmxpre.h"

#include "gromacs/utility/strconvert.h"

#include <cerrno>
#include <cstdlib>

#include <limits>
#include <string>

#include "gromacs/utility/cstringutil.h"
#include "gromacs/utility/exceptions.h"

namespace gmx
{

//! \cond libapi

bool boolFromString(const char* value)
{
    if (gmx_strcasecmp(value, "1") == 0 || gmx_strcasecmp(value, "yes") == 0
        || gmx_strcasecmp(value, "true") == 0)
    {
        return true;
    }
    if (gmx_strcasecmp(value, "0") == 0 || gmx_strcasecmp(value, "no") == 0
        || gmx_strcasecmp(value, "false") == 0)
    {
        return false;
    }
    GMX_THROW(InvalidInputError("Invalid value: '" + std::string(value)
                                + "'; supported values are: 1, 0, yes, no, true, false"));
}

int intFromString(const char* str)
{
    errno                 = 0;
    char*          endptr = nullptr;
    const long int value  = std::strtol(str, &endptr, 10);
    if (errno == ERANGE || value < std::numeric_limits<int>::min()
        || value > std::numeric_limits<int>::max())
    {
        GMX_THROW(InvalidInputError("Invalid value: '" + std::string(str)
                                    + "'; it causes an integer overflow"));
    }
    if (str[0] == '\0' || *endptr != '\0')
    {
        GMX_THROW(InvalidInputError("Invalid value: '" + std::string(str) + "'; expected an integer"));
    }
    return value;
}

int64_t int64FromString(const char* str)
{
    errno                = 0;
    char*         endptr = nullptr;
    const int64_t value  = str_to_int64_t(str, &endptr);
    if (errno == ERANGE)
    {
        GMX_THROW(InvalidInputError("Invalid value: '" + std::string(str)
                                    + "'; it causes an integer overflow"));
    }
    if (str[0] == '\0' || *endptr != '\0')
    {
        GMX_THROW(InvalidInputError("Invalid value: '" + std::string(str) + "'; expected an integer"));
    }
    return value;
}

float floatFromString(const char* str)
{
    errno               = 0;
    char*        endptr = nullptr;
    const double value  = std::strtod(str, &endptr);
    if (errno == ERANGE || value < -std::numeric_limits<float>::max()
        || value > std::numeric_limits<float>::max())
    {
        GMX_THROW(InvalidInputError("Invalid value: '" + std::string(str)
                                    + "'; it causes an overflow/underflow"));
    }
    if (str[0] == '\0' || *endptr != '\0')
    {
        GMX_THROW(InvalidInputError("Invalid value: '" + std::string(str) + "'; expected a number"));
    }
    return value;
}

double doubleFromString(const char* str)
{
    errno               = 0;
    char*        endptr = nullptr;
    const double value  = std::strtod(str, &endptr);
    if (errno == ERANGE)
    {
        GMX_THROW(InvalidInputError("Invalid value: '" + std::string(str)
                                    + "'; it causes an overflow/underflow"));
    }
    if (str[0] == '\0' || *endptr != '\0')
    {
        GMX_THROW(InvalidInputError("Invalid value: '" + std::string(str) + "'; expected a number"));
    }
    return value;
}

//! \endcond

} // namespace gmx
