#!/usr/bin/env perl

use v5.36;
use re '/aa';

use FindBin::libs;

use Trog::Config();
use Getopt::Long qw{GetOptionsFromArray};

=head1 SYNOPSIS

Get, or set, the hostname this tCMS instance serves.

Everything which needs to know the site's domain -- TOTP enrollment, the DNS
zone, generated URLs -- reads it out of the configuration, so this is where it
gets put there in the first place.

=head2 USAGE

    bin/tcms-hostname                  # print the configured hostname
    bin/tcms-hostname example.com      # set it, then print it
    bin/tcms-hostname --user           # print it as a valid username

=head2 OPTIONS

=over 4

=item --user

Print the hostname mangled into something usable as a system username: dots
become dashes, and it's truncated to 32 characters.  Does not change what is
stored in the configuration.

=back

=head2 CAVEATS

Writes to $Trog::Config::home_cfg rather than saving over whatever get()
loaded, as that is the tracked config/default.cfg until the instance has a
configuration of its own.

Dies if asked to print a hostname which was never set.

=cut

my $user;
GetOptionsFromArray(\@ARGV,
    'user' => \$user,
);

my $hostname = $ARGV[0];

my $conf = Trog::Config->get();
if ($hostname) {
    $conf->param('general.hostname', $hostname);

    # write(), not save().  save() writes back to whatever file get() loaded,
    # which is the tracked config/default.cfg until the instance has saved a
    # configuration of its own.
    $conf->write($Trog::Config::home_cfg) or die "Could not write $Trog::Config::home_cfg";
}

my $domain = $conf->param('general.hostname');
die "Hostname not set in tCMS configuration.  Please set this first by passing the hostname to bin/tcms-hostname." unless $domain;

# Transform the domain name into something maximally compatible with being a username.
if ($user) {
    $domain = substr($domain, 0, 32);
    $domain =~ s/\./-/g;
}

print "$domain\n";