//
// Copyright (C) 2004-2008 Maciej Sobczak, Stephen Hutton
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//

#include "common.h"
#include <soci-backend.h>
#include <cstdlib>
#include <ctime>


namespace // anonymous
{

// helper function for parsing decimal data (for std::tm)
long parse10(char const * & p1, char * & p2, char const * msg)
{
    long v = std::strtol(p1, &p2, 10);
    if (p2 != p1)
    {
        p1 = p2 + 1;
        return v;
    }
    else
    {
        throw soci::soci_error(msg);
    }
}

} // namespace anonymous


void soci::details::postgresql::parse_std_tm(char const * buf, std::tm & t)
{
    char const * p1 = buf;
    char * p2;
    long year, month, day;
    long hour = 0, minute = 0, second = 0;

    char const * errMsg = "Cannot convert data to std::tm.";

    year  = parse10(p1, p2, errMsg);
    month = parse10(p1, p2, errMsg);
    day   = parse10(p1, p2, errMsg);

    if (*p2 != '\0')
    {
        // there is also the time of day available
        hour   = parse10(p1, p2, errMsg);
        minute = parse10(p1, p2, errMsg);
        second = parse10(p1, p2, errMsg);
    }

    t.tm_isdst = -1;
    t.tm_year = year - 1900;
    t.tm_mon  = month - 1;
    t.tm_mday = day;
    t.tm_hour = hour;
    t.tm_min  = minute;
    t.tm_sec  = second;

    std::mktime(&t);
}

double soci::details::postgresql::string_to_double(char const * buf)
{
    double t;
    int n;
    int const converted = sscanf(buf, "%lf%n", &t, &n);
    if (converted == 1 && static_cast<std::size_t>(n) == strlen(buf))
    {
        // successfully converted to double
        // and no other characters were found in the buffer

        return t;
    }
    else
    {
        throw soci_error("Cannot convert data.");
    }
}