#!/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"
# 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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.

# linux_storage
# Linux storage section (Spec 1.4): storage.disks (identity, size, slot, health) and
# storage.partitions, from lsblk, smartctl and /sys/class/enclosure.
#
# Revision History:
# 2026-10-18 Claude v1.0.0 new sensor, split from unix_storage (bug 210)

package linux_storage;

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 = 'storage';
#######################################################
#
# parseEnclosurePaths( $paths )
#
# Linux: maps disks to slots from the paths matching
# /sys/class/enclosure/*/*/device/block/<dev>; the slot is the
# enclosure component directory name.
#
# Parameters:
#   $paths - array reference of matching paths
#
# Returns:
#   hash reference dev => slot
#
# Side Effects:
#   none
#
#######################################################
sub parseEnclosurePaths {
   my $paths = shift;
   my %slots;
   foreach my $path (@{$paths}) {
      next unless $path =~ m{^/sys/class/enclosure/[^/]+/([^/]+)/device/block/([^/]+)$};
      $slots{$2} = $1;
   }
   return \%slots;
}

#######################################################
#
# main()
#
# Emits storage.disks and storage.partitions keys.
#
# Parameters:
#   none
#
# Returns:
#   integer exit status (1 wrong OS, 2 not applicable)
#
# Side Effects:
#   runs lsblk and smartctl, writes STDOUT/STDERR
#
#######################################################
sub main {
   if (!checkOS({ 'linux' => undef })) {
      print STDERR "unsupported os\n";
      return 1;
   }
   my $inv = localDiskInventory();
   if (defined($inv->{'missing'})) {
      print STDERR "$inv->{'missing'} not found\n";
      return 2;
   }
   my $disks = $inv->{'disks'};
   my $slots = parseEnclosurePaths([glob('/sys/class/enclosure/*/*/device/block/*')]);
   my $health = collectHealth($disks);

   my @out;
   push @out, @{emitStorageDisks($disks, $slots)};
   push @out, @{healthLines($_, $health->{$_})} foreach sort keys %{$disks};
   push @out, @{partitionLines($inv->{'resolver'})};
   unless (@out) {
      print STDERR "no disks found\n";
      return 2;
   }
   print join("\n", @out), "\n";
   return 0;
}

exit main() unless caller;
1;