#!/usr/bin/perl

# This is a gemini client.
# Copyright (C) 2022 Jake Thoughts
#
# This program is free software: you can redistribute it and/or modify 
# it under the terms of the GNU 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 
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License 
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
# jake@jakes-mail.top, jjakke@sqt.wtf, jjakke@member.fsf.org (email & xmpp)

use strict;
use warnings;
#use diagnostics;
#use utf8;
#use bytes;
use feature qw(refaliasing);
no warnings qw(experimental::refaliasing);

our $VERSION = 'v1.0.1';

# Modules
use IO::Socket::SSL; # CPAN
use URL::XS qw(parse_url split_url_path parse_url_query); # CPAN
use IO::Pager; # CPAN
require Text::Wrapper; # CPAN
use Term::ReadKey; # CPAN
use Term::ANSIColor; # Core
use Path::Naive qw(normalize_path); # CPAN
use Text::ParseWords; # Core
use Term::ReadLine; # CPAN
#use Smart::Comments; # CPAN
use URI::Encode qw(uri_encode); # CPAN
use IO::Socket::SSL::Utils; # CPAN
use File::Slurper qw(read_dir read_text); # CPAN
#use Data::Dumper; # Core
use File::BaseDir qw(xdg_config_home xdg_data_home xdg_cache_home); # CPAN
use TOML qw(from_toml to_toml); # CPAN

# sudo cpanm IO::Socket::SSL URL::XS IO::Pager Text::Wraper Term::ReadKey Path::Naive  Text::ParseWords Term::ReadLine Smart::Comments URI::Encode IO::Socket::SSL::Utils File::Slurper File::BaseDir TOML

my %config = (
	'use_pager' => 1,
	'pager_text_wrap_auto' => 1,
	'textwrap' => 70, # not used if pager_text_warp_auto is 1
	'timeout' => 10,
	'pretty_links' => 1,
	'pretty_headers' => 1,
	'auto_redirect' => 3,
	'pager' => 'less -R',
	'doc_out' => 1,
	'keep_history' => 0,
);
my @doc;
my @links;
my $current_url = "";
my @history;
my @bookmarks;
my $prompt = "";
my $pre_block = 0;
my @status_code;
my $status_code1;
my $status_code2;
my $auto_redirect_count = 0;
my $sleep;
my $use_cert = 0;
my $cert;
my $key;
my %known_hosts;
my $program_name = 'jakes-gemini-client';
my $bd = File::BaseDir->new;
my $xdg_config = $bd->xdg_config_home . "/$program_name/";
my $xdg_data = $bd->xdg_data_home . "/$program_name/";
my $xdg_cache = $bd->xdg_cache_home . "/$program_name/";
if (! -e $xdg_config) {
	mkdir($xdg_config)
}
if (! -e $xdg_data) {
	mkdir($xdg_data)
}
if (! -e $xdg_cache) {
	mkdir($xdg_cache)
}
### $xdg_config
### $xdg_data
### $xdg_cache
my @cache;

load_config();
my $wrapper = Text::Wrapper->new(columns=>$config{textwrap}, body_start=>'');
$ENV{PAGER} = $config{pager};

my $term=new Term::ReadLine "hmm, what goes here?";
my $OUT = $term->OUT || \*STDOUT;

my %commands = (
	'url' => [sub { url($_[0]) }, 'Go to the specified URL.'],
	'u' => [sub { url($_[0]) }, 'Alias of `url\''],
	
	'urlrelative' => [sub { urlrelative($_[0]) }, "Navigate the current URL relatively.\n\n"
		."Note: if the current path is '/blog/my-post1.gmi' and 'my-post2.gmi'\n" .
		"was supplied then the resulting path will be: '/blog/my-post2.gmi'\n" .
		"which is probably what you want. You can also use './my-post2.gmi'.\n" .
		"'.', of course, means 'same directory', in this case '/blog/'.\n\n" .
		"To remove the forward slash ('/') at the end of the current url,\n" . 
		"type the back-slash ('\\') by itself.\n\n" .
		"urlrelative without an argument will remove the ending '/' or go\n" .
		"up a directory without appending a forward slash.\n" .
		"IE: '/blog/drafts/secret/post.gmi -> '/blog/drafts/secret' -> '/blog/drafts'"],
	'ur' => [sub { urlrelative($_[0]) }, 'Alias of `urlrelative\''],

	'cwu' => [sub { print $OUT "$current_url\n"; }, 'Returns the current working URL.'],
	'c' => [sub { print $OUT "$current_url\n"; }, 'Alias of `cwu\'.'],

	'links' => [sub { links() }, 'Returns the links on the current page.'],
	'l' => [sub { links() }, 'Alias of `links\'.'],

	'nav' => [sub { nav(0, $_[0]) }, 'Navigate to a link that is on the current page (use links)'],
	'n' => [sub { nav(0, $_[0]) }, 'Alias of `nav\'.'],

	'navh' => [sub { nav(1, $_[0]) }, 'Navigate to a URL specified from history (use hist)'],
	'nh' => [sub { nav(1, $_[0]) }, 'Alias of `navh\'.'],

	'navb' => [sub { nav(2, $_[0]) }, 'Navigate to a URL specified from bookmarks (use bookmarks)'],
	'nb' => [sub { nav(2, $_[0]) }, 'Alias of `navh\'.'],


	'root' => [sub { root() }, 'Go to the root of the current URL.\n' .
		'Exp: gemini://capsule.com/blog/2020112.gmi -> gemini://capsule.com/' ],

	'hist' => [sub { hist() }, 'Returns history.' ],
	'h' => [sub { hist() }, 'Alias of `hist\'.' ],

	'back' => [sub { back(0) }, 'Go back in history, once. The previously accessed URI is cached.' ],
	'b' => [sub { back(0) }, 'Alias of `back\'.' ],

	'backnodisplay' => [sub { back(1) }, 'Go back in history but do not display the page' .
		'(still accesses the resource).' ],
	'bd' => [sub { back(1) }, 'Alias of `backnodisplay\'.'],

	'display' => [sub { display() }, 'Display the current page.' ],
	'd' => [sub { display() }, 'Alias of `display\'.' ],

	'usepager' => [sub { toggle($config{use_pager}) }, 'This toggles pager use. 1 = use pager, 0 = stdout.' ],
	'pretty_links' => [sub { toggle($config{pretty_links}) }, "0 = do nothing, 1 = pretty."],
	'pretty_headers' => [sub { toggle($config{pretty_headers}) }, "0 = do nothing, 1 = pretty."],
	'textwrap' => [sub { textwrap($_[0]) }, "Set textwrap length.\nGiving 'auto' will " .
		"automatically determine the appropriate length."],
	'pager' => [sub { pager($_[0],$_[1]) }, "Set which pager to use. (currently $config{pager})"],
	'save-config' => [sub { save_config() }, 'Save the config settings.'],
	'load-config' => [sub { load_config() }, "Load the config settings.\n" .
			'This is not needed as the configs are loaded when the program is started.' ],
	'help' => [sub { help($_[0]); }, 'Use help before a command to get extra info.' .
		'(<tab><tab> to see commands)'],
	'ver' => [sub {print $OUT "$VERSION\n"}, "Returns the version ($VERSION)"],
	'exit' => [sub {begin_exit();}, "This exits the program with a status code of 0."],

	'autoredirection' => [sub { value_number($config{auto_redirect},$_[0],'autoredirect') },
		"The amount of times this program is allowed to auto redirect. 0 = none."],
	'timeout' => [sub { value_number($config{timeout},$_[0],'timeout') },
		"The client will time out when the server takes too long." ],

	'clearquery' => [sub { clear_query() }, "Removes query from current URL"],
	'cq' => [sub { clear_query() }, "Alias of `clearquery'"],

	'reload' => [sub {url($current_url)}, "Reload the current URL."],
	'r' => [sub {url($current_url)}, "Alias of `reload'."],

	'cert-create' => [sub { cert_create() }, "Create a cert. Interactive."],
	'cert-use' => [sub { cert_use() }, "Use a cert. Interactive.\n" . 
		"If a cert has already been loaded, it will unload it."],
	'cert-del' => [sub {cert_del() }, "Delete a cert. Interactive." ],

	'keep-history' => [sub {toggle($config{keep_history})}, 'Toggle whether to save history to disk or not,' . 
		' after \'exit\'. By default it does not.' ],
	'clear-history' => [sub { undef(@history) }, 'Clears your history. (The file itself is very parsable)' ],

	'bookmark-add' => [sub { bookmark_add($_[0]) }, 'Add bookmark. ' .
		'No argument means the current url, otherwise what was supplied.'],
	'bookmark-del' => [sub { bookmark_del($_[0]) }, 'Delete bookmark by number' .
		' (use \'bookmarks\' to see numbers).'],
	'bookmarks' => [sub { bookmarks(); }, 'Returns your bookmarks. Use \'nb\' or \'navb\' along with this.'],
);

my @completions = keys %commands;

$term->Attribs->{'do_expand'}=1;
$term->Attribs->{'completion_entry_function'} = $term->Attribs->{'list_completion_function'};
$term->Attribs->{'completion_word'} = \@completions;
$term->ornaments(0);

$prompt = "$current_url > ";

print $OUT "gmi.pl Copyright (C) 2022 Jake Thoughts\n";
print $OUT "This program comes with ABSOLUTELY NO WARRANTY.\n";
print $OUT "This is free software, and you are welcome to redisdtribute it\n";
print $OUT "under certain conditions. See COPYING for details.\n";
print $OUT "Press <tab><tab> to see available commands.\n";
while ( defined ($_ = $term->readline($prompt)) ) {
	if ($_) {
		my ($command, $detail, @other_details) = split(/\s/, $_);
		do_command(\$command, \$detail, @other_details);
	}
	$prompt = "$current_url > ";
}

sub do_command {
	# referenced command, referenced arg, additional args
	my ($rCmd, $rArg, $rArgs) = @_; 

	### @_
	# checking if %commands even has the command
	if (exists $commands{$$rCmd}) {

		# assigning a reference to a subroutine to the value
		my $rsub = $commands{$$rCmd}[0];

		#running the subroutine
		&$rsub($$rArg,$rArgs);

	}
	# options doesn't have the command
	else {
		print $OUT "Command is invalid.\n";
	}	
}

sub help {
	my ($cmd) = @_;
	### @_
	if ($cmd and exists $commands{$cmd}) {
		print $OUT "$commands{$cmd}[1]\n";
	} elsif ($cmd) {
		print $OUT "`$cmd' isn't an avaliable command.\n";
	}
	else {
		print $OUT "$commands{help}[1]\n"
	}
}

sub url {
	my ($url) = @_;
	### $url
	if (!$url) { print("Example: [gemini://]capsule.com/\n"); return 1;}
	if (! has_scheme($url) ) {
		$url = "gemini://$url";
	}
	 
	eval {
		$url = parse_url($url);
	};
	if ($@) {
		print $OUT "$@\n";
		return 0;
	}

	### $url
	if (! $url->{port} or $url->{port} eq 0) {
		$url->{port} = '1965';
	}
	
	my $cl;
	if ($use_cert and $cert and $key) {
		$cl = IO::Socket::SSL->new(
			PeerHost => "$url->{host}",
			PeerPort => "$url->{port}",
	
			SSL_verify_mode => SSL_VERIFY_NONE,
			SSL_verifycn_name => "$url->{host}",
			SSL_version => '!SSLv2:!SSLv3:!TLSv1:!TLSv1_1',
			SSL_fast_shutdown => 1,
	
			SSL_cert_file => "$cert",
			SSL_key_file => "$key",
	
			Timeout => 2,
		);
	}
	else {
		$cl = IO::Socket::SSL->new(
			PeerHost => "$url->{host}",
			PeerPort => "$url->{port}",
	
			SSL_verify_mode => SSL_VERIFY_NONE,
			SSL_verifycn_name => "$url->{host}",
			SSL_version => '!SSLv2:!SSLv3:!TLSv1:!TLSv1_1',
			SSL_fast_shutdown => 1,
	
			Timeout => 2,
		);
	}

	if ($cl) {
		$current_url = return_url($url);
		### $current_url
		### $url

		if (@doc) {
			@cache = @doc;
		}
		undef(@doc);
		if (peer_cert($cl, $url->{host})) {

			eval {
				local $SIG{ALRM} = sub {close ($cl); unshift(@doc,""); die "TIMEOUT";};
				alarm $config{timeout};
	
				# gemini spec: <URL><CR><LF>
				# <URL> is an absolute path
				print $cl "$current_url\r\n";
	
				@doc = <$cl>;
	
				close($cl); # if this isnt here, the kernel will have to clean up unused ports
	
				alarm 0;
			};
	
			if ($@) {
				print $OUT "Timed out after $config{timeout} seconds - server is taking too long.\n";
				update_history( ["$current_url", "timed out"] );
				### @doc
			} else {
				follow_status_code();
			}
		}
		else {
			print $OUT "Not connecting\n";
		}
	}

	else {
		print $OUT "error=$!, ssl_error=$SSL_ERROR\n";
	}
}

sub peer_cert {
	# ## peer_cert
	# 1. compare figureprint if possible
	# 2. is it expired?
	# 3. if error: ask user for imput
	my ($cl, $hostname) = @_;
	# ## before CERT_asHash
	my @peer_certs = $cl->peer_certificates;
	#print $OUT Dumper(\@peer_certs);
	#
	# if the server sends us more than ONE cert then I am baffled as to why but it happens
	my $peer_cert = CERT_asHash($peer_certs[0]);
	# ## IO Socket SSL Utils already has done fingerprinting so we do not need to.
	my $peer_fingerprint = $peer_cert->{fingerprint_sha256}; 
	my $peer_not_before = $peer_cert->{not_before};
	my $peer_not_after = $peer_cert->{not_after};
	my $verify_hostname = $cl->verify_hostname($hostname);
	### $peer_cert
	### $peer_fingerprint
	### $peer_not_before
	### $peer_not_after
	### $verify_hostname

	if (! $verify_hostname) {
		print $OUT "The server offers a cert that doesn't match their domain name.\n";
		return 0;
	}

	# compare figureprint...
	if ($known_hosts{$hostname}) {
		# user HAS visited this domain before
		if ($known_hosts{$hostname} eq $peer_fingerprint) {
			# fingerprint same
			;
		}
		else {
			# fingerprint NOT same
			print $OUT colored("!!! THE HOST'S FINGERPRINT IS NOT THE SAME !!!\n", 'bright_red');
			print $OUT "Do you still wish to connect to it? y/N ";
			chomp(my $yORn = <STDIN>);
			if (lc $yORn eq 'y') {
				print $OUT "Would you like to replace the known_hosts fingerprint with this one? y/N ";
				chomp(my $yORn = <STDIN>);
				if (lc $yORn eq 'y') {
					$known_hosts{$hostname} = $peer_fingerprint;
				}
			}
			else {
				return 0;
			}
		}
	}
	else {
		# user has NOT visited this domain before TOFU
		$known_hosts{$hostname} = $peer_fingerprint;
	}

	# check expiratory
	if ($peer_not_before < time() and time() < $peer_not_after) {
		### not expired
		;
	}
	else {
		### expired!
		print $OUT "The host has an expired certificate. Connect anyway? y/N ";
		chomp(my $yORn = <STDIN>);
		if (lc $yORn eq 'y') {
			;
		}
		else {
			return 0;
		}
	}
	return 1;
}

sub follow_status_code {
	return 1 if (!@doc);
	@status_code = split(' ', $doc[0]);
	$status_code1 = substr($doc[0],0,1);
	$status_code2 = substr($doc[0],1,1);
	update_history( ["$current_url", "$status_code1$status_code2"] );
	my $bad_code = "The server sent an invalid status code, not defined by gemini specifications.\n@doc";

	if ($status_code1 == 2) { # 2 will probably be the most common server reply
		if ($status_code2 == 0) {
			shift(@doc); # user probably doesn't want to see the 20 */* every time
			             # at some point deal with image/* and other media
			get_links();
			pretty_links() if ($config{pretty_links});
			pretty_headers() if ($config{pretty_headers});

			if ($config{doc_out}) {
				display();
			}
		}
		else {
			print $OUT $bad_code;
		}

	} elsif ($status_code1 == 1) {
		if ($status_code2 == 0) {
			print $OUT "Server wants you to type something:\n@doc";
		} elsif ($status_code2 == 1) {
			print $OUT "Server wants you to type something secretly (do note: not secure):\n@doc";
			ReadMode 2;
		} else {
			print $bad_code;
			print $OUT "\nPresumably, the server wants you to type something:\n";
		}
		chomp(my $input = <STDIN>);
		$input = uri_encode($input);
		ReadMode 1;
		url("$current_url?$input");
		clear_query();

	} elsif ($status_code1 == 3) { 
		print $bad_code if ($status_code2 !~ m/^0|1$/); # not worrying about permanent/temporary yet
		print $OUT "Redirecting anyway.\n" if ($status_code2 !~ m/^0|1$/);
		if ($config{auto_redirect}) {
			$auto_redirect_count++;
			if ($auto_redirect_count < $config{auto_redirect}) {
				print $OUT "Redirection...\n";
				### @status_code
				access_resource($status_code[1]); # redirection can be './hello.gmi'
			}
			else {
				print $OUT "Reached limit for auto redirection.\n@doc";
			}
		}
		else {
			print $OUT "The server wants to redirect us, however, autoredirect has turned off.\n@doc";
		}
		$auto_redirect_count = 0;

	} elsif ($status_code1 == 4) {
		if ($status_code2 == 0) {
			print $OUT "Temporary failure.\n@doc";
		} elsif  ($status_code2 == 1) {
			print $OUT "Server is unavailable (yet somehow sent a reply to us).\n@doc";
		} elsif ($status_code2 == 2) {
			print $OUT "Server's CGI script is broken.\n@doc";
		} elsif ($status_code2 == 3) {
			print $OUT "Server was unable to proxy content.\n@doc";
		} elsif ($status_code2 == 4) {
			if (!$sleep) {
				$sleep = 5;
				print $OUT "Server wants us to slow down.\n" .
				"Reconnecting after $sleep seconds\n" .
				"Press 'ctrl-C' to cancel sleep\n" .
				"@doc\n";
				eval {
					local $SIG{INT} = sub { die "Cancelling Sleep!\n" };
					sleep ($sleep); # give the server an extra second
					url($current_url);
				}
			}
			else {
				print $OUT "The server is asking us to slow down and try again.\n" .
				"We have already done this once: not doing it again.\n";
			}
			undef($sleep);
		}
		else {
			print $bad_code;
		}

	} elsif ($status_code1 == 5) {
		if ($status_code2 == 0) {
			print $OUT "Permanent failure. Requests to this URI will reliably fail.\n@doc";
		} elsif ($status_code2 == 1) {
			print $OUT "Not found. Not available but *may* be in the future\n@doc";
		} elsif ($status_code2 == 2) {
			print $OUT "Gone. This resource will not be available again.\n@doc";
		} elsif ($status_code2 == 3) {
			print $OUT "Proxy Request Refused. Resource not served by this server and this\n" .
			"server does not accept proxy requests.\n@doc";
		} elsif ($status_code2 == 9) {
			print $OUT "Bad Request. The server is unable to parse our request.\n@doc";
		}
		else {
			print $bad_code;
		}

	} elsif ($status_code1 == 6) {
		if ($status_code2 == 0) {
			print $OUT "The server is asking you for a certificate. (cert-use to load a cert)\n@doc";
		} elsif ($status_code2 == 1) {
			print $OUT "The certificate you supplied is not authorized to access this resource.\n@doc";
		} elsif ($status_code2 == 2) {
			print $OUT "The certificate you supplied is malformed. There is something wrong with it.\n@doc";
		}
		else {
			print $OUT $bad_code;
		}
	}
	else {
		print $OUT $bad_code;
	}
	### @status_code;
}

sub urlrelative {
	my ($urlr) = @_;
	if (! $urlr) { $urlr = ""}
	if (! $current_url) {print $OUT "Relative movement impossible: no current URL.\n"; return 1;}
	my $end_with_slash = 1 if ($urlr =~ m|/$|);
	my $dot_only = 1 if ($urlr =~ m|^\.$|);
	my $dot_2_only = 1 if ($urlr =~ m|^\.\.$|); # since we are going up into a dir
	my $c_url_directory = 1 if ($current_url =~ m|/$|);
	my $remove_slash = 1 if ($urlr =~ m|^\\$|);  # back slash \ not a forward slash /

	### is urlr a slash only ?
	if ($urlr =~ m|^/$|) { # if slash only
		$current_url .= "/";
		url("$current_url");
		return 0;
	}

	### remove slash ?
	if ($remove_slash) {
		substr($current_url,-1,1,'');
		### $current_url
		url($current_url);
		return 0;
	}

	### is the current url a directory?
	if ($c_url_directory) {
		$current_url .= "$urlr";
		my $c_p_url = parse_url($current_url);
		### $c_p_url
		# if $urlr has '..' then normalize_path will not go beyond the last element
		# which is why prefixing a '/' and then taking it away (parse_url doesnt have
		# the forward / ) will result in expected behavior as host always end with '/'
		$c_p_url->{path} = normalize_path("/" . $c_p_url->{path});
		if ($end_with_slash or $dot_only or $dot_2_only) {
			$c_p_url->{path} .= "/"; # normalize path will remove it
		}
		substr($c_p_url->{path},0,1,'');
		if ($c_p_url->{path} eq '/') {
			delete $c_p_url->{path}; # dont want to ask for 'gemini://host.com//'
		}
		url(return_url($c_p_url));
		return 0;
	}

	### current url is not a directory, so should be fine to remove last item on path
	# ^ some servers serve index page on 'dir' rather than 'dir/'  :v annoying
	# authors using servers like that will notice that the links on index page need to be
	# carefully managed, because ALL clients (that handle links correctly) *will* mess up. 
	if (! $c_url_directory) {
		my $c_p_url = parse_url($current_url);
		### $c_p_url
		my $c_paths_url = split_url_path($c_p_url->{path}, 256);
		### $c_paths_url
		pop(@$c_paths_url);
		### $c_paths_url
		delete ($c_p_url->{path});
		for (@$c_paths_url) {
			$c_p_url->{path} .= "$_/";
		}
		### $c_p_url
		$c_p_url->{path} .= "$urlr";
		$c_p_url->{path} = normalize_path("/" . "$c_p_url->{path}");
		if ($end_with_slash or $dot_only or $dot_2_only) {
			$c_p_url->{path} .= "/"; # normalize path will remove it
		}
		substr($c_p_url->{path},0,1,'');
		if ($c_p_url->{path} eq '/') {
			delete $c_p_url->{path}; # dont want to ask for 'gemini://host.com//'
		}
		### $c_p_url
		url(return_url($c_p_url));
		return 0;
	}
}

sub return_url {
	my ($url) = @_;
	my $url_string;
	# ## @_
	if (ref($url) ne 'HASH') { # assuming string
		if ($url !~ m|.*://|) {
			$url =~ s|(.*)|gemini://$1|;
		}
		$url = parse_url($url);
	}
	my $scheme = $url->{scheme};
	my $username = $url->{username};
	my $password = $url->{password};
	my $host = $url->{host};
	my $port = $url->{port};
	my $path = $url->{path};
	my $query = $url->{query};
	my $fragment = $url->{fragment};
	
	# 'https://peter:bro@localhost:8989/some/path/to/resource?q1=yes&q2=no&q3=maybe#frag=1';
	# a valid url ^^
	if (! $scheme) {
		$url_string .= "gemini://";
	} 
	else {
		$url_string .= "$scheme://";
	}
	if ($username and $password) {
		$url_string .= "$username:$password@";
	} elsif ($username) {
		$url_string .= "$username@";
	}
	$url_string .= "$host" if ($host);
	if ($port and $port ne 1965) {
		$url_string .= ":$port";
	}
	$url_string .= "/";
	$url_string .= "$path" if ($path);
	$url_string .= "?$query" if ($query);
	$url_string .= "#$fragment" if ($fragment);

	return $url_string;
}

sub get_links {
	undef(@links);
	#for my $line (split('\n', $doc)) {
	for (@doc) {
		#if ($line =~ m/^=>[\s]*([\w\d\-\\\/\.\:\~\?\=\#]+)[\s]*(.+)?$/gm) {
		_pre_block($_);
		if ($_ =~ m/^=>[\s]*([\w\d\-\\\/\.\:\~\?\=\#]+)[\s]*(.+)?$/gm and not $pre_block) {
			if ($2) {
				push(@links, ["$1", "$2"]);
			}
			else {
				push(@links, ["$1", "$1"]);
			}
		}
	}
}

sub hist {
	my $hist;
	my $counter = 1;
	### @history
	for my $item (@history) {
		### $item
		$hist .= "[$counter] ". colored("$$item[0]", 'underline') ." $$item[1]\n";
		$counter++;
	}
	if ($hist) {
		print $OUT $hist;
	}
	else {
		print $OUT "\n";
	}
}

sub update_history {
	my ($history) = @_;
	push(@history, $history);
}

sub links {
	my $d;
	my $counter = 1;
	for my $item (@links) {
		$d .= "[$counter] ". colored($$item[0], 'underline') . " $$item[1]\n";
		$counter++;
	}
	if ($d) {
		print $OUT $d;
	}
	else {
		print $OUT "No links.\n";
	}
}

sub nav {
	# Setting 0: from links
	# Setting 1: from history
	# Setting 2: from bookmarks
	my ($setting,$n) = @_;
	### $n
	### $setting
	### @_
	if (! $n or $n !~ /\d+/) {
		print $OUT "Try 'links', 'hist', or 'bookmarks' then 'navY X', where x is the number and Y. " .
		"is nav mode.\n";
		return 1;
	}
	$n -= 1;

	my $link;

	if ($setting == 0 and @links and exists $links[$n][0]) {
		$link = $links[$n][0];
	} elsif ($setting == 1 and @history and exists $history[$n][0]) {
		$link = $history[$n][0];
	} elsif ($setting == 2 and @bookmarks and exists $bookmarks[$n]) {
		$link = $bookmarks[$n];
	}
	else {
		print $OUT "'" . ($n+1) ."' isn't available.\n";
		return 1;
	}
	access_resource($link);
}

sub access_resource {
	my ($link) = @_;
	# This implies it is valid fqdn
	if (has_scheme($link)) {
		url("$link");
	} elsif (substr($link,0,2) eq '//') { # technically valid
		url("gemini:$link");
	}
	else {
		my $c_url = parse_url($current_url);
		my $end_with_slash = 1 if ($link =~ m|.*/$|);
		my $begin_with_slash = 1 if ($link =~ m|^/.*|);

		### absolute location ?
		if ($begin_with_slash) {
			delete($c_url->{path});
			$c_url->{path} = $link;
			#if ($end_with_slash){
			#	$c_url->{path} .= "/";
			#}
			substr($c_url->{path},0,1,'');
			url(return_url($c_url));
			return 	0;
		}

		### current url is a directory ?
		if ($current_url =~ m|.*/$|) {
			$current_url .= $link;
			#if ($end_with_slash) {
			#	$current_url .= "/";
			#}
			url(return_url($current_url));
			return 0;
		} 
		else { 
			### current url must NOT be a directory
			my $d;
			if ($c_url->{path}) {
				my $cp_url = split_url_path($c_url->{path}, 256);
				pop(@$cp_url);
				for (@$cp_url) {
					$d .= "$_/";
				}
			}
			$d .= $link;
			$c_url->{path} = normalize_path($d);
			if ($end_with_slash) {
				$c_url->{path} .= "/";
			}
			url(return_url($c_url));
			return 0;
		}
	}
}

sub has_scheme {
	return ($_[0] =~ m|^.*(://)|);
}

sub root {
	my $new_url = parse_url($current_url);
	url("$new_url->{scheme}://$new_url->{host}/");
}

sub back {
	my ($display) = @_;

	### @_
	### $display
	my $dok_out = $config{doc_out};

	$config{doc_out} = 0 if ($display == 1);

	if (@history >= 2) {
		$current_url="$history[-2][0]";
		if (@cache) {
			my @array = @doc;
			@doc = @cache;
			@cache = @array;
			display();
		}
		else {
			# when the user just started the program and types 'back' and has history
			url("$history[-2][0]");
		}
	}
	else {
		print $OUT "No such history there.";
	}
	### @history

	$config{doc_out} = $dok_out if ($display == 1);
}

sub display {
	if ($config{pager_text_wrap_auto}) {
		my ($wc) = GetTerminalSize();
		$wrapper->columns($wc);
	}
	if ($config{use_pager}) {
		### opening IO Pager
		eval {
			# catch it or big files ( >1000 lines ) will load but the script itself dies for some reason
			local $SIG{PIPE} = sub { die };
			IO::Pager::open(my $FH) or warn($!);
			for (@doc) {
				_pre_block($_);
				if ($pre_block) {
					print $FH $_;
				} 
				else {
					print $FH $wrapper->wrap($_);
				}
			}
			close $FH;
		};
	}
	else { 
		for (@doc) {
			_pre_block($_);
			if ($pre_block) {
				print $OUT $_;
			}
			else {
				print $OUT $wrapper->wrap($_);
			}
		}
	}
}

sub toggle {
	# refaliasing
	\my $t = \$_[0];
	if ($t == 1) {
		$t = 0;
	}
	else {
		$t = 1;
	}
	if (! $_[1]) {
		print $OUT "$t\n";
	}
}

sub textwrap {
	my ($c) = @_;
	if ($c and $c =~ m/^\d+$/) {
		$config{textwrap} = $c;
		$wrapper->columns($c);
		$config{pager_text_wrap_auto} = 0;
	} elsif ($c and $c eq 'auto') {
		$config{pager_text_wrap_auto} = 1;
	}
	else {
		if ($config{pager_text_wrap_auto}) {
			my ($c) = GetTerminalSize();
			print("[AUTO] $c\n");
		}
		else {
			print "$config{textwrap}\n";
		}
	}
}

sub pager {
	my ($p,@other) = @_;
	### @other
	if ($p) {
		$config{pager} = $p;
		if ($other[0]) {
			for (@other) {
				$config{pager} .= " $_";
			}
		}
		print $OUT "save-config, and restart the program for change to take effect.\n";
	}
	else {
		print $OUT "$config{pager}\n";
	}
}

sub pretty_links {
	my $counter = 1;
	for (@doc) {
		_pre_block($_);
		if ((substr($_,0,2)) eq '=>' and not $pre_block) {
			$_ =~ m/^=>[\s]*([\w\d\-\\\/\.\:\~\?\=\#]+)[\s]*(.+)?$/;
			if ($2) {
				$_ = colored("[$counter" . _is_not_scheme_gemini($1) . "]",'underline') . " $2\n";
			}
			else {
				$_ = colored("[$counter" . _is_not_scheme_gemini($1) . "]",'underline') . " $1\n";
			}
			$counter++;
		}
	}
}

sub pretty_headers {
	for (@doc) {
		_pre_block($_);
		if ((substr($_,0,3)) eq '###' and not $pre_block) {
			$_ =~ s/^###[\s]*(.*)$/colored("$1",'underline')/e;
		}
		if ((substr($_,0,2)) eq '##' and not $pre_block) {
			$_ =~ s/^##[\s]*(.*)$/colored("$1",'bold')/e;
		}
		if ((substr($_,0,1)) eq '#' and not $pre_block) {
			$_ =~ s/^#[\s]*(.*)$/colored("$1",'bold', 'underline')/e;
		}
	}
}

sub _is_not_scheme_gemini {
	### @_
	my ($thing) = $_[0];
	if (has_scheme($thing)) {
			$_[0] =~ m|(.*)://.*|;
			if ($1 ne 'gemini') {
				return " $1";
			}
	}
	return '';
}

sub _pre_block {
	if (substr($_[0],0,3) eq '```') {
		toggle($pre_block,1);
		return 1;
	}
}

sub value_number {
	# refaliasing
	\my $v = \$_[0];
	my $numb = $_[1];
	my $k = $_[2];
	$v = $numb if ($numb =~ m/^\d*$/);
	print $OUT "$k is now: $v\n";
	### @_
}

sub clear_query {
	return 1 if (!$current_url);
	my @url = split('\?', $current_url);
	$current_url = $url[0];
}

sub cert_create {
	my $old_umask = umask(077);

	if (! -e "$xdg_data/certs") {
		mkdir("$xdg_data/certs");
	}
	print $OUT "What should the profile name be? ";
	chomp(my $input = <STDIN>);
	$input =~ tr|/|.|;
	if (-e "$xdg_data/certs/$input") {
		print $OUT "Sorry, but that already exists.\n";
	}
	else {
		mkdir("$xdg_data/certs/$input");
		print $OUT "What should the commonName be? (it will be used to identify you easily) ";
		chomp(my $common_name = <STDIN>);
		my $expire;
		while (1) {
			print $OUT "When should this expire? (1s, 1h, 1d, 1m, 1y, 0s (cancel)) ";
			chomp($expire = <STDIN>);
			if ($expire =~ m/^(\d+)+(\w)$/) {
				if (lc $2 eq 's') {
					if ($1 == 0) {
						print $OUT "Cancelling.\n";
						umask($old_umask);
						return 1;
					}
					else {
						$expire = $1 + time();
					}
				} elsif (lc $2 eq 'h') {
					$expire = ($1*3600) + time(); # 3600 seconds in an hour
				} elsif (lc $2 eq 'd') {
					$expire = ($1*86400) + time(); # 86400 seconds in a day
				} elsif (lc $2 eq 'm') {
					$expire = ($1*2592000) + time(); # 2592000 seconds in 30 days (month)
				} elsif (lc $2 eq 'y') {
					$expire = ($1*31536000) + time(); # 31536000 seconds in 365 days (year)
				} else {
					next;
				}
			}
			else {
				next;
			}
			last;
		}
		my $not_before = time();
		### $expire
		### $not_before
		my %cert = (
			'subject' => {
				'commonName' => "$common_name",
			},
			'not_before' => $not_before,
			'not_after' => $expire,
		);
		my ($cert, $key) = CERT_create(%cert);
		PEM_cert2file($cert,"$xdg_data/certs/$input/cert.pem");
		PEM_key2file($key,"$xdg_data/certs/$input/key.pem");
		CERT_free($cert);
		KEY_free($key);
	}
	umask($old_umask);
}

sub cert_use {
	if (! $use_cert) {

		my $counter = 1;
		my @profiles;
		if (! -e "$xdg_data/certs") {
			print $OUT "You need to create a cert first: 'cert-create'.\n";
			return 1;
		}
		for (read_dir("$xdg_data/certs")) { 
			print $OUT "[$counter] $_\n";
			push(@profiles, "$_");
			$counter++;
		}
		if (! @profiles) {
			print $OUT "You need to create a cert first: 'cert-create'.\n";
			return 1;
		}

		print $OUT "Which profile? ";
		chomp(my $input = <STDIN>);

		if ($input) {
			eval {
				$cert = PEM_file2cert("$xdg_data/certs/$profiles[$input-1]/cert.pem");
					$key = PEM_file2key("$xdg_data/certs/$profiles[$input-1]/key.pem");
				CERT_free($cert);
				KEY_free($key);
				$cert = "$xdg_data/certs/$profiles[$input-1]/cert.pem";
				$key = "$xdg_data/certs/$profiles[$input-1]/key.pem";
			};
			if ($@) {
				print $OUT "Something is wrong with the certificate/key. Will not use.\n$@";
				$cert = "";
				$key = "";
			}
			else {
				print $OUT "Cert and Key loaded.\n";
				toggle($use_cert);
			}
		}
		else {
			print $OUT "Did not load anything.\n";
		}
	}
	else {
		print $OUT "Unloading cert and key.\n";
		toggle($use_cert);
	}
}

sub cert_del {
	if (! -e "$xdg_data/certs") {
		print $OUT "You need to create a cert first: 'cert-create'.\n";
		return 0;
	}

	my $counter = 1;
	my @profiles;
	for (read_dir("$xdg_data/certs")) { 
		print $OUT "[$counter] $_\n";
		push(@profiles, "$_");
		$counter++;
	}
	if (! @profiles) {
		print $OUT "You need to create a cert first: 'cert-create'.\n";
		return 0;
	}
	print $OUT "Delete which profile? ";
	chomp(my $input = <STDIN>);
	if ($input) {
		print $OUT "Are you sure you want to delete $profiles[$input-1]/? y/N";
		chomp(my $yORn = <STDIN>);
		if (lc $yORn eq 'y') {
			unlink("$xdg_data/certs/$profiles[$input-1]/cert.pem",
				"$xdg_data/certs/$profiles[$input-1]/key.pem");
			rmdir("$xdg_data/certs/$profiles[$input-1]");
			if ($!) {
				print $OUT "Unable to delete profile.\n$!\n";
			}
			else {
				print $OUT "Profile '$profiles[$input-1]' succesfully deleted.\n";
			}
		}
		else {
			print $OUT "Nothing is deleted.\n";
		}
	}
	else {
		print $OUT "Nothing is deleted.\n";
	}
}

sub bookmarks {
	my $counter = 1;
	for (@bookmarks) {
		print $OUT "[$counter] $_\n";
		$counter++;
	}
}

sub bookmark_del {
	my ($b) = @_;
	if ($b and $b =~ m/^\d+$/) {
		if ($bookmarks[$b-1]) {
			print $OUT "Removing $bookmarks[$b-1]";
			splice(@bookmarks,$b-1,1);
		}
		### @bookmarks
	}
	else {
		print $OUT "Doing nothing.";
	}
}

sub bookmark_add {
	my ($b) = @_;
	if ($b) {
		push(@bookmarks, $b);
	}
	else {
		push(@bookmarks, $current_url);
	}
}

sub save_config {
	my $toml = to_toml(\%config);
	open(my $FH, '>', "$xdg_config/config.toml");
	print $FH $toml;
	close $FH;
}

sub load_config {
	my ($config, $err);
	if (-e "$xdg_config/config.toml") {
		($config, $err) = from_toml(read_text("$xdg_config/config.toml"));
		unless ($config) {
			print $OUT "Error parsing toml: $err\n";
		}
	}
	### $config
	for (keys %$config) {
		$config{$_} = %$config{$_};
	}
	if (-e "$xdg_data/history") {
		open(my $FH, '<', "$xdg_data/history");
		while (<$FH>) {
			my @h = split(' ',$_);
			push(@history, [@h]);
		}
		close $FH;
	}
	### @history
	if (-e "$xdg_data/bookmarks") {
		open(my $FH, '<', "$xdg_data/bookmarks");
		while (<$FH>) {
			chomp($_);
			push(@bookmarks, $_);
		}
		close $FH;
	}
	### @bookmarks
	if (-e "$xdg_data/known_hosts") {
		open(my $FH, '<', "$xdg_data/known_hosts");
		while (<$FH>) {
			my ($a, $b) = split(' ', $_);
			$known_hosts{$a} = $b;
		}
	}
	### %known_hosts
}

sub begin_exit {
	my $old_umask = umask(077);
	if ($config{keep_history}) {
		# over writes the history with old and new
		open(my $FH, '>', "$xdg_data/history"); 
		for my $item (@history) {
			print $FH "$$item[0] $$item[1]\n";
		}
		close $FH;
	}

	# over writes the bookmarks with old and new
	open(my $FH, '>', "$xdg_data/bookmarks"); 
	for my $bookmark (@bookmarks) {
		print $FH "$bookmark\n";
	}
	close $FH;

	# over writes the known_hosts with old and new
	open($FH, '>', "$xdg_data/known_hosts"); 
	for my $known_host (sort keys %known_hosts) {
		print $FH "$known_host $known_hosts{$known_host}\n";
	}
	close $FH;
	umask($old_umask);

	exit 0;
}