/*
 * Copyright (c) 2015 Carsten Larsen
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <stdlib.h>
#include <string.h>
#include <math.h>

#include "tz.h"
#include "ntimed.h"

int tzid = 0;

void ArgTimezone(const char *tz)
{
    unsigned int i;
    static const unsigned int count = sizeof(tza) / sizeof(struct tzabbr);

    if (tz == NULL)
        return;

    if (!strcmp(tz, "-")) {
        tzid = 0;
        utcoffset = 0.0;
        return;
    }

    if (!strcmp(tz, "?")) {
        PrintTimeZones();
        return;
    }

    for (i = 0; i < count; i++) {
        if (!strcmp(tza[i].abbr, tz)) {
            tzid = i;
            utcoffset = tza[i].offset;
            return;
        }
    }

    Fail(NULL, 0, "Unknown timezone. Try TIMEZONE=?");
}

void PrintTimeZones()
{
    unsigned int i;
    static const unsigned int count = sizeof(tza) / sizeof(struct tzabbr);

    for (i = 0; i < count; i++) {
        Put(NULL, OCX_DEBUG,
            "%s\t%s%.2f\t%s\n",
            tza[i].abbr,
            tza[i].offset < 0.0 ? "-" : "+",
            fabs(tza[i].offset),
            tza[i].name);
    }
    
    exit(1);
}