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#!/usr/bin/env perl
# Copyright (C) 2017–2021  Alex Schroeder <alex@gnu.org>

# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License along
# with this program. If not, see <https://www.gnu.org/licenses/>.

=encoding utf8

=head1 NAME

Gemini Chat - a client that keeps sending the lines you type to one URL

=head1 DESCRIPTION

All C<gemini-chat> does is repeatedly post stuff to a Gemini URL. For example,
assume that there is a Phoebe wiki with chat enabled via L<App::Phoebe::Chat>.
First, you connect to the I<listen> URL using C<gemini>:

    gemini --cert_file=cert.pem --key_file=key.pem \
      gemini://localhost/do/chat/listen

Then you connect the chat client to the I<say> URL using C<gemini-chat>:

    gemini-chat --cert=cert.pem --key=key.pem \
      gemini://transjovian.org/do/chat/say

To generate your client certificate for 100 days and using “Alex” as your common
name:

    openssl req -new -x509 -newkey ec -subj "/CN=Alex" \
      -pkeyopt ec_paramgen_curve:prime256v1 -days 100 \
      -nodes -out cert.pem -keyout key.pem

=cut

use Modern::Perl '2018';
use Mojo::IOLoop;
use Pod::Text;
use Getopt::Long;
use Term::ReadLine;
use Encode::Locale qw(decode_argv);
use Encode qw(decode_utf8 encode_utf8);
use Net::IDN::Encode qw(:all);
use URI::Escape;
use IRI;

my $cert;
my $key;
my $help;
my $listen_url;
my $say_url;

GetOptions(
  'help' => \$help,
  'cert_file=s' => \$cert,
  'key_file=s' => \$key)
    or die("Error in command line arguments\n");

# Help
if ($help) {
  my $parser = Pod::Text->new();
  $parser->parse_file($0);
  exit;
}

die "âš  You must provide an existing certificate and key file\n"
    unless $cert and $key and -f $cert and -f $key;

# Regular arguments
decode_argv();
my ($uri) = @ARGV;

die "âš  You must provide an URI\n" unless $uri;

my $iri = IRI->new(value => encode_utf8 $uri);

die "âš  The URI '$uri' must use the gemini scheme\n" unless $iri->scheme and $iri->scheme eq 'gemini';
die "âš  The URI '$uri' must have an authority\n" unless $iri->authority;
warn "âš  Ignoring path '" . $iri->path . "'\n" if $iri->path;
warn "âš  Ignoring fragment '" . $iri->fragment . "'\n" if $iri->fragment;

my $host = domain_to_ascii(decode_utf8 $iri->host);
my $port = $iri->port || 1965;
my $unsafe = "^A-Za-z0-9\-\._~"; # the default
my $path = uri_escape_utf8($iri->path, $unsafe . "/"); # path separator are safe

$uri = $iri->scheme . '://' . $host . ':' . $port;
$uri .= $path if $path;

# start read loop for saying stuff
my $term = Term::ReadLine->new($uri);
my $prompt = "> ";
my $OUT = $term->OUT || \*STDOUT;
while (defined ($_ = $term->readline($prompt))) {
  exit if $_ eq "quit";
  # create client