#!/usr/bin/env perl

# Copyright (c) 2025, R. W. Rodolico
# 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# all_filesystems
# Filesystem usage sensor compatible with old unix_partitions output.
# Replaces unix_partitions.
#
# Revision History:
# 2026-10-12 Copilot v1.0.0 r? initial v3.8.0 unix filesystems sensor
# 2026-10-18 Claude renamed from unix_filesystems (bug 210)

package all_filesystems;

use strict;
use warnings;
use version;
our $VERSION = version->declare('v1.0.0');

use FindBin;
use File::Spec;
use lib File::Spec->catdir($FindBin::Bin), File::Spec->catdir("$FindBin::Bin/..");
use library qw(:all);

my $CATEGORY = 'diskinfo';

#######################################################
#
# parseDf( $dfText )
#
# Parses df -kT output into old diskinfo filesystem keys.
#
# Parameters:
#   $dfText - text from df -kT
#
# Returns:
#   array reference of output lines
#
# Side Effects:
#   none
#
#######################################################
sub parseDf {
   my $dfText = shift;
   my @out;
   foreach my $line (split(/\n/, defined($dfText) ? $dfText : '')) {
      next if $line =~ /^Filesystem\s+/;
      next unless $line =~ /^\/dev\//;
      my @parts = split(/\s+/, trim($line));
      next unless @parts >= 7;
      my ($device, $fstype, $size, $used, undef, undef, $mount) = @parts;
      push @out, "$CATEGORY\t$device\tfstype\t$fstype";
      push @out, "$CATEGORY\t$device\tsize\t$size";
      push @out, "$CATEGORY\t$device\tused\t$used";
      push @out, "$CATEGORY\t$device\tmount\t$mount";
   }
   return \@out;
}

#######################################################
#
# main()
#
# Emits old diskinfo filesystem lines from df output.
#
# Parameters:
#   none
#
# Returns:
#   integer exit status
#
# Side Effects:
#   runs df and writes STDOUT/STDERR
#
#######################################################
sub main {
   if (!checkOS({ 'linux' => undef, 'freebsd' => undef })) {
      print STDERR "unsupported os\n";
      return 1;
   }
   unless (validCommandOnSystem({ 'df' => undef })) {
      print STDERR "df not found\n";
      return 2;
   }
   my $dfText = runCommand('df', '-kT');
   my $lines = parseDf($dfText);
   print join("\n", @{$lines}), "\n" if @{$lines};
   return 0;
}

exit main() unless caller;
1;