#  $Id: ddiff2.pl 0.05 2000/03/20 00:00:05 tom Exp $
#
#  ddiff2.pl:  Creates a Gcal location resource file.
#
#  Any but default configuration could confuse this script.
#  It comes along with a UN*X script `ddiff' and a DOS batch `ddiff.bat'
#  which supports the correct usage.
#
#  It is *not* guaranteed that this script works for any other call than
#  the one given above but it could easily be modified and extended for
#  using other special modes of operation.
#
#  If you modify this script you have to rename the modified version.
#
#  If you make any improvements I would like to hear from you.
#  But I do not promise any support.
#
#  Copyright (c) 2000  Thomas Esken      <esken@uni-muenster.de>
#                      Im Hagenfeld 84
#                      D-48147 M"unster
#                      GERMANY
#
#  This software doesn't claim completeness, correctness or usability.
#  On principle I will not be liable for ANY damages or losses (implicit
#  or explicit), which result from using or handling my software.
#  If you use this software, you agree without any exception to this
#  agreement, which binds you LEGALLY !!
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the `GNU General Public License' as published by
#  the `Free Software Foundation'; either version 3, or (at your option)
#  any later version.
#
#  You should have received a copy of the `GNU General Public License'
#  along with this program; if not, write to the:
#
#
#
$[ = 1;			# set array base to 1

#
# Define the default return values of this process.
#
$EXIT_SUCCESS = 0;
$EXIT_FATAL = 2;
#
# Get possibly given command line arguments.
#
for ($i = 1; $i < ($#ARGV+1); $i++) {
    if (substr($ARGV[$i], 1, 1) eq '-') {
	if (substr($ARGV[$i], 2, 1) eq 'a') {
	    $a = substr($ARGV[$i], 3, 999999);
	}
	else {
	    exit $EXIT_FATAL;
	}
    }
    else {
	last;
    }
    shift;
    $i--;
}
#
# Set the default value of some variables.
#
$ndiff = 0;
$dndiff = 0;
$first_run = 0;
$full_time = 0;
#
# Create the file header of Gcal location resource file.
#
printf "; %s, day/night lengths and differences for Gcal-2.20 or newer\n;\n",
	$a;

#
# Main block.
#
line: while (<>) {
    chop;	# strip record separator
    @Fld = split(/[ \n]/, $_, 9999);

    if (length($Fld[3]) > 7) {
	$full_time = 1;
    }
    $dh = substr($Fld[3], 1, 2);
    $dm = substr($Fld[3], 4, 2);
    $dt = $dh * 3600 + $dm * 60;
    if ($full_time == 1) {
	$dt += substr($Fld[3], 7, 6);
    }
    if ($first_run == 0) {
	$first_run = 1;
	$cc = substr($Fld[2], 1, 2);
	$location = substr($Fld[2], 4, 999999);
	printf "; Location:      %s, %s\n", $location, $cc;
	printf "; Co-ordinate:   %s\n", $Fld[5];
	printf "; Created:       %s, %s\n", $Fld[6], $Fld[7];
	printf "; \\\n";
	if ($full_time == 1) {
	    printf "YYYYMMDD day=d          night=n        location       dnDiff         delta          DdMAX          DdMIN\\\n";
	    printf "-----------------------------------------------------------------------------------------------------------------\n";
	}
	else {
	    printf "YYYYMMDD day=d   night=n location       dnDiff  delta  DdMAX   DdMIN\\\n";
	    printf "----------------------------------------------------------------------\n";
	}
	$ddiff = $dt;
    }
    $nh = substr($Fld[4], 1, 2);
    $nm = substr($Fld[4], 4, 2);
    $nt = $nh * 3600 + $nm * 60;
    if ($full_time == 1) {
	$nt += substr($Fld[4], 7, 6);
    }
    if ($ndiff == 0) {
	$ndiff = $nt;
    }
    $diff = $dt - $nt;
    if ($dndiff == 0) {
	$dndiff = $diff;
    }
    $delta = $diff - $dndiff;
    $x = $dmax - $dt;
    $ddmaxh = int($x) / 3600;
    if ($ddmaxh < 0) {
	$ddmaxh = -$ddmaxh;
    }
    $ddmaxm = ((int($x) % 3600) + ($x - int($x))) / 60;
    if ($ddmaxm < 0) {
	$ddmaxm = -$ddmaxm;
    }
    $x = $dt - $dmin;
    $ddminh = int($x) / 3600;
    if ($ddminh < 0) {
	$ddminh = -$ddminh;
    }
    $ddminm = ((int($x) % 3600) + ($x - int($x))) / 60;
    if ($ddminm < 0) {
	$ddminm = -$ddminm;
    }
    if ($full_time == 1) {
	if ($delta < 0) {
	    $delta_sign = '-';
	    $delta = -$delta;
	}
	else {
	    $delta_sign = '+';
	}
	$delta_mins = ((int($delta) % 3600) + ($delta - int($delta))) / 60;
	$ddmaxs = ($ddmaxm - int($ddmaxm)) * 60;
	$ddmins = ($ddminm - int($ddminm)) * 60;
	if ($diff < 0) {
	    $diff_mins = ((int(-$diff) % 3600) + (-$diff - int(-$diff))) / 60;
	    printf "%s %s %s %-14s~-%02dh%02d'%06.3f\" %s%02dh%02d'%06.3f\" -%02dh%02d'%06.3f\" +%02dh%02d'%06.3f\"\n",
	    substr($Fld[1], 1, 8), $Fld[3], $Fld[4], substr($location, 1, 14),
	    -$diff / 3600, $diff_mins, ($diff_mins - int($diff_mins)) * 60,
	    $delta_sign, $delta / 3600, $delta_mins, ($delta_mins - int($delta_mins)) * 60,
	    $ddmaxh, $ddmaxm, $ddmaxs, $ddminh, $ddminm, $ddmins;
	}
	else {
	    $diff_mins = ((int($diff) % 3600) + ($diff - int($diff))) / 60;
	    printf "%s %s %s %-14s~+%02dh%02d'%06.3f\" %s%02dh%02d'%06.3f\" -%02dh%02d'%06.3f\" +%02dh%02d'%06.3f\"\n",
	    substr($Fld[1], 1, 8), $Fld[3], $Fld[4], substr($location, 1, 14),
	    $diff / 3600, $diff_mins, ($diff_mins - int($diff_mins)) * 60,
	    $delta_sign, $delta / 3600, $delta_mins, ($delta_mins - int($delta_mins)) * 60,
	    $ddmaxh, $ddmaxm, $ddmaxs, $ddminh, $ddminm, $ddmins;
	}
    }
    else {
	if ($diff < 0) {
	    printf "%s %s %s %-14s -%02dh%02d' %+05d' -%02dh%02d' +%02dh%02d'\n",
	    substr($Fld[1], 1, 8), $Fld[3], $Fld[4], substr($location, 1, 14),
	    -$diff / 3600, (int(-$diff) % 3600) / 60, $delta / 60,
	    $ddmaxh, $ddmaxm, $ddminh, $ddminm;
	}
	else {
	    printf "%s %s %s %-14s +%02dh%02d' %+05d' -%02dh%02d' +%02dh%02d'\n",
	    substr($Fld[1], 1, 8), $Fld[3], $Fld[4], substr($location, 1, 14),
	    $diff / 3600, (int($diff) % 3600) / 60, $delta / 60,
	    $ddmaxh, $ddmaxm, $ddminh, $ddminm;
	}
    }
    $ddiff = $dt;
    $ndiff = $nt;
    $dndiff = $diff;
}

exit $EXIT_SUCCESS;