#! /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.

# Revision History:
# 2026-10-13 Copilot v2.0.0 stage-3 uninstall rewrite
# 2026-10-13 Copilot v2.0.1 header/history alignment and list-form OS detection

use strict;
use warnings;

# find our location and use it for searching for libraries
BEGIN {
   use FindBin;
   use File::Spec;
   # use libraries from the directory this script is in
   use lib File::Spec->catdir($FindBin::Bin);
   # and its parent
   use lib File::Spec->catdir( $FindBin::Bin . '/../' );
}

use File::Basename qw(basename);
use Getopt::Long;
use version;
our $VERSION = version->declare('v2.0.1');

use installer_shared qw(
   loadInstallerConfig
   getRootPrefix
   rootPath
   removeTreeIfExists
   runCommandList
   slurpCommand
);

my $keepConfig = 0;
my $os = '';
my $quiet = 0;
my $dryRun = 0;
my $help = 0;
my $showVersion = 0;
my $root = '';

#######################################################
#
# printHelp()
#
# Displays usage text.
#
# Parameters:
#   none
#
# Returns:
#   none
#
# Side Effects:
#   writes STDOUT
#
#######################################################
sub printHelp {
   print basename($0) . " $VERSION\n";
   print <<'END_HELP';
uninstall [options]
Options:
   --keep-config          preserve configuration directory
   --os|-o <name>         override OS detection
   --root <path>          test root prefix
   --quiet|-q             reduce output
   --dryrun|-n            no filesystem changes
   --version|-v           display version and exit
   --help|-h              show this screen
END_HELP
}

#######################################################
#
# detectOs()
#
# Resolves OS token using determineOS helper.
#
# Parameters:
#   none
#
# Returns:
#   scalar OS token
#
# Side Effects:
#   runs determineOS
#
#######################################################
sub detectOs {
   return $os if $os ne '';
   my $rootPrefix = getRootPrefix($root);
   local $ENV{'SYSINFO_ROOT'} = $rootPrefix if defined($rootPrefix) && $rootPrefix ne '';
   my $det = slurpCommand(['perl', "$FindBin::Bin/determineOS"]);
   chomp $det if defined($det);
   return defined($det) ? $det : '';
}

Getopt::Long::Configure('bundling');
GetOptions(
   'keep-config' => \$keepConfig,
   'os|o=s' => \$os,
   'root=s' => \$root,
   'quiet|q' => \$quiet,
   'dryrun|n' => \$dryRun,
   'version|v' => \$showVersion,
   'help|h' => \$help,
) or die "Error parsing command line\n";

if ($help) {
   printHelp();
   exit 0;
}
if ($showVersion) {
   print basename($0) . " $VERSION\n";
   exit 0;
}

my $cfg = loadInstallerConfig("$FindBin::Bin/installer_config.pl");
my $osName = detectOs();
if (!exists($cfg->{'operatingSystems'}{$osName})) {
   print STDERR "unsupported operating system\n";
   exit 2;
}
my $rootPrefix = getRootPrefix($root);
my $row = $cfg->{'operatingSystems'}{$osName};

my $bindir = rootPath($rootPrefix, $row->{'bindir'});
my $previous = $bindir . '.previous';
my $confdir = rootPath($rootPrefix, $row->{'confdir'});
my $schedule = $row->{'schedule'} eq '' ? '' : rootPath($rootPrefix, $row->{'schedule'});
my $legacySchedule = $row->{'legacySchedule'} eq '' ? '' : rootPath($rootPrefix, $row->{'legacySchedule'});
my $actions = $row->{'opnsenseActions'} eq '' ? '' : rootPath($rootPrefix, $row->{'opnsenseActions'});

print "Removing bindir $bindir\n" unless $quiet;
removeTreeIfExists($bindir, $dryRun) or exit 2;

print "Removing previous tree $previous\n" unless $quiet;
removeTreeIfExists($previous, $dryRun) or exit 2;

if ($schedule ne '') {
   print "Removing schedule entry $schedule\n" unless $quiet;
   removeTreeIfExists($schedule, $dryRun) or exit 2;
}
if ($legacySchedule ne '') {
   print "Removing legacy schedule entry $legacySchedule\n" unless $quiet;
   removeTreeIfExists($legacySchedule, $dryRun) or exit 2;
}

if ($actions ne '') {
   print "Removing OPNsense actions file $actions\n" unless $quiet;
   removeTreeIfExists($actions, $dryRun) or exit 2;
   my $rc = runCommandList(['service', 'configd', 'restart'], $dryRun);
   if ($rc != 0 && !$dryRun) {
      print STDERR "warning: could not restart configd\n";
   }
}

if (!$keepConfig) {
   print "Removing confdir $confdir\n" unless $quiet;
   removeTreeIfExists($confdir, $dryRun) or exit 2;
}

exit 0;