#!/usr/bin/perl -w

use strict;

use Getopt::Long;
use Time::Local;

my %opts = ();
GetOptions(\%opts, "fs=s", "data=s", "user=s");

my $lastdate = "";
my @data = ();

print STDERR "fs = ", $opts{"fs"}, "\n";
print STDERR "user = ", $opts{"user"}, "\n";
print STDERR "data = ", $opts{"data"}, "\n";

sub usage {
    print STDERR "Usage: $0 --fs=<filesystem> --user=<username> --data=[bi]\n";
    exit(1);
}

my @path = split(/:/, $ENV{PATH});
unless (grep { $_ eq "/usr/local/bin" } @path) {
    push @path, "/usr/local/bin";
}
$ENV{PATH} = join(":", @path);

while(<>) {
    my ($date, $fs, $user, $bused, $bsoft, $bhard, $iused, $isoft, $ihard) = split(/\t/);
    if (
	($opts{"fs"} ? $fs eq $opts{"fs"} : 1) &&
	($opts{"user"} ? $user eq $opts{"user"} : 1) 

    ) {
	if ($date ne $lastdate) {
	    my $time;
	    if ($date =~ /(\d{4})-(\d{2})-(\d{2})T(\d{1,2}):(\d{2}):(\d{2})/) {
		$time = timelocal($6, $5, $4, $3, $2-1, $1-1900);
	    } else {
		die "unparsable date $date\n";
	    }

	    my $ld;
	    if ($opts{data} eq "b") {
		$ld = [ $bused, $bsoft, $bhard ];
	    }  elsif ($opts{data} eq "i") {
		$ld = [ $iused, $isoft, $ihard ];
	    } else {
		usage();
	    }
	    push(@data, [ $time, $ld ]);
	    $lastdate = $date;
	}
    }
}

open (DATA, ">quotastat.data") or die "cannot open quotastat.data for output: $!";
for (my $i = 0; $i <= $#data; $i++) {
    my $time = ($data[$i])->[0];
    my $data = ($data[$i])->[1];

    print DATA $time;
    for my $j (@$data) {
	print DATA "\t", $j + 0;
    }
    print DATA "\n";
}
close(DATA);

open (CTL, ">quotacheck.ctl") or die "cannot open quotacheck.ctl for output: $!";

# generic settings

print CTL "set term postscript color\n";
print CTL "set output 'quotastat.ps'\n";
print CTL "set data style lines\n";
print CTL "set grid\n";

# compute ticks

my $firsttime = ($data[0])->[0];
my $lasttime = ($data[$#data])->[0];

if ($lasttime - $firsttime > 3 * 30 * 24 * 3600) {
    my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($firsttime);
    $sec = $min = $hour = 0;
    $mday = 1;
    $firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
    print CTL "set xtics rotate (";
    my $comma = 0;
    my $time;
    for (;;) {
	$time = timelocal($sec,$min,$hour,$mday,$mon,$year);
	if ($comma) {
	    print CTL ", ";
	} else {
	    $comma = 1;
	}
	printf CTL qq|"%04d-%02d-%02d" %d|, $year+1900, $mon+1, $mday, $time;
	if (++$mon >= 12) {
	    $mon = 0; $year++;
	}
	if ($time > $lasttime) {last}
    }
    $lasttime = $time;
    print CTL ")\n";
} elsif ($lasttime - $firsttime > 30 * 24 * 3600) {
    my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($firsttime);
    $firsttime -= 86400 * $wday;

    ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($firsttime);
    $sec = $min = $hour = 0;
    my $time = $firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
    print CTL "set xtics rotate (";
    my $comma = 0;
    for (;;) {
	($sec,$min,$hour,$mday,$mon,$year) = localtime($time);
	if ($comma) {
	    print CTL ", ";
	} else {
	    $comma = 1;
	}
	printf CTL qq|"%04d-%02d-%02d" %d|, $year+1900, $mon+1, $mday, $time;
	if ($time > $lasttime) {last}

	$time += 7 * 24 * 3600;
	($sec,$min,$hour,$mday,$mon,$year) = localtime($time);
	my $toff = $hour * 3600 + $min * 60 * $sec;
	if ($toff != 0) {
	    if ($toff > 12*3600) {
		$toff = 24 * 3600 - $toff;
	    }
	    print "correcting time by $toff seconds ";
	    printf "from %04d-%02d-%02d %02d:%02d:%02d ", $year+1900, $mon+1, $mday, $hour, $min, $sec;
	    $time -= $toff;
	    ($sec,$min,$hour,$mday,$mon,$year) = localtime($time);
	    printf "to %04d-%02d-%02d %02d:%02d:%02d\n", $year+1900, $mon+1, $mday, $hour, $min, $sec;
	}
	    

    }
    $lasttime = $time;
    print CTL ")\n";
} else {
    my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($firsttime);
    $sec = $min = $hour = 0;
    my $time = $firsttime = timelocal($sec,$min,$hour,$mday,$mon,$year);
    print CTL "set xtics rotate (";
    my $comma = 0;
    for (;;) {
	($sec,$min,$hour,$mday,$mon,$year) = localtime($time);
	if ($comma) {
	    print CTL ", ";
	} else {
	    $comma = 1;
	}
	printf CTL qq|"%04d-%02d-%02d" %d|, $year+1900, $mon+1, $mday, $time;
	if ($time > $lasttime) {last}

	$time += 24 * 3600;
	($sec,$min,$hour,$mday,$mon,$year) = localtime($time);
	my $toff = $hour * 3600 + $min * 60 * $sec;
	if ($toff != 0) {
	    if ($toff > 12*3600) {
		$toff = 24 * 3600 - $toff;
	    }
	    print "correcting time by $toff seconds ";
	    printf "from %04d-%02d-%02d %02d:%02d:%02d ", $year+1900, $mon+1, $mday, $hour, $min, $sec;
	    $time -= $toff;
	    ($sec,$min,$hour,$mday,$mon,$year) = localtime($time);
	    printf "to %04d-%02d-%02d %02d:%02d:%02d\n", $year+1900, $mon+1, $mday, $hour, $min, $sec;
	}
	    

    }
    $lasttime = $time;
    print CTL ")\n";
}

# what to plot

print CTL qq{plot "quotastat.data" using 1:2 title "used", "quotastat.data" using 1:3 title "soft", "quotastat.data" using 1:4 title "hard"\n};

close (CTL);


my $rc = system("gnuplot", "quotacheck.ctl");
print "system returned $rc\n";

my $fs = $opts{fs};
$fs =~ s|/|_|g;

system("gs -sDEVICE=ppmraw -r150 -dBATCH -sOutputFile=- -q - < quotastat.ps |" .
       "pnmscale 0.5 |" .
       "pnmflip -cw |" .
       "pnmcrop |" .
       "ppmquant 256 |" .
       "ppmtogif >/usr/local/www/wsr/intranet/quotas/$opts{user}$fs.gif");