#! /usr/bin/perl
# Copyright (C) 2004  Alex Schroeder <alex@emacswiki.org>
#
# 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 <http://www.gnu.org/licenses/>.

use CGI qw/:standard/;
use CGI::Carp qw(fatalsToBrowser);
use LWP::UserAgent;
use Encode;

if (not param('url')) {
  print header(-charset=>'utf-8'),
    start_html('PHP Wiki Search RSS 3.0'),
    h1('PHP Wiki Search RSS 3.0'),
    p('Translates a PHP Wiki Search result into RSS 3.0 usable by Oddmuse.'),
    start_form(-method=>'GET'),
    p('Search URL: ', textfield('url', '', 40), checkbox('latin-1'), submit()),
    end_form(),
    end_html();
  exit;
}

print header(-type=>'text/plain; charset=UTF-8');

my $url = param('url');
if (param('latin-1')) {
  $url =~ s/%([0-9a-f][0-9a-f])/chr(hex($1))/ige;
  $url = encode('latin-1', decode('utf-8', $url));
  my @letters = split(//, $url);
  my @safe = ('a' .. 'z', 'A' .. 'Z', '0' .. '9', '-', '_', '.', '!', '~', '*', "'", '(', ')',
	      ':', '/', '?', ';', '&', '=');
  foreach my $letter (@letters) {
    my $pattern = quotemeta($letter);
    if (not grep(/$pattern/, @safe)) {
      $letter = uc(sprintf("%%%02x", ord($letter)));
    }
  }
  $url = join('', @letters);
}

my $ua = new LWP::UserAgent;
my $request = HTTP::Request->new('GET', $url);
my $response = $ua->request($request);
my $data = $response->content;
$data = encode('utf-8', decode('latin-1', $data)) if param('latin-1');

$data =~ /\<title\>([^<]*)/i;
print "title: $1\n" if $1;
print "link: " . param(url) . "\n";
print "debug: $url\n"; # FIXME
print "\n";
while ($data =~ m|<dt>.*?<a href="([^"]*)".*\n((<dd>.*</dd>\n)*)|g) {
  my ($title, $desc) = ($1, $2);
  $title =~ s/%([0-9a-f][0-9a-f])/chr(hex($1))/ige;
  $title = encode('utf-8', decode('latin-1', $title)) if param('latin-1');
  print "title: $title\n";
  $_ = $desc;
  s|<dd>||g;
  s|<small[^>]*>||g;
  s|<strong[^>]*>||g;
  s|</strong>||g;
  s|</small>||g;
  s|</dd>||g;
  s|\n+$||g;
  s|\n|\n\t|g;
  print "description: $_\n";
  print "\n";
}