# Copyright (C) 2006, 2008, 2009  Alex Schroeder <alex@gnu.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 strict;
use v5.10;

AddModuleDescription('load-lang.pl', 'Language Browser Preferences');

our ($q, %CookieParameters, $ConfigFile, $DataDir, $ModuleDir, $NamespaceCurrent, @MyInitVariables);
our $CurrentLanguage;

our $LoadLanguageDir = "$ModuleDir/translations"; # by default same as in git

$CookieParameters{interface} = '';

our %TranslationsLibrary = (
  'bg'    => 'bulgarian-utf8.pl',
  'ca'    => 'catalan-utf8.pl',
  'de'    => 'german-utf8.pl',
  'et'    => 'estonian-utf8.pl',
  'es'    => 'spanish-utf8.pl',
  'fi'    => 'finnish-utf8.pl',
  'fr'    => 'french-utf8.pl',
  'gr'    => 'greek-utf8.pl',
  'he'    => 'hebrew-utf8.pl',
  'it'    => 'italian-utf8.pl',
  'ja'    => 'japanese-utf8.pl',
  'ko'    => 'korean-utf8.pl',
  'nl'    => 'dutch-utf8.pl',
  'pl'    => 'polish-utf8.pl',
  'pt'    => 'portuguese-utf8.pl',
  'pt-br' => 'brazilian-portuguese-utf8.pl',
  'ro'    => 'romanian-utf8.pl',
  'ru'    => 'russian-utf8.pl',
  'se'    => 'swedish-utf8.pl',
  'sr'    => 'serbian-utf8.pl',
  'uk'    => 'ukrainian-utf8.pl',
  'zh'    => 'chinese-utf8.pl',
  'zh-cn' => 'chinese_cn-utf8.pl',
  'zh-tw' => 'chinese-utf8.pl',
    );

sub LoadLanguage {
  # my $requested_language = "da, en-gb;q=0.8, en;q=0.7";
  my $requested_language = $q->http('Accept-language');
  my @languages = split(/ *, */, $requested_language);
  my %Lang = ();
  foreach (@languages) {
    my $qual = 1;
    $qual = $1 if (/q=([0-9.]+)/);
    $Lang{$qual} = $1 if (/^([-a-z]+)/);
  }
  my $lang = GetParam('interface', '');
  $Lang{2} = $lang if $lang;
  my @prefs = sort { $b <=> $a } keys %Lang;
  # print ($q->header . $q->start_html
  #      . $q->pre("input: $requested_language\n"
  #                . "Result: "
  #                . join(', ', map { "$_ ($Lang{$_})" } @prefs))
  #      . $q->end_html) && exit if GetParam('debug', '');
  foreach (@prefs) {
    last if $Lang{$_} eq 'en'; # the default
    my $file = $TranslationsLibrary{$Lang{$_}};
    next unless $file; # file is not listed, eg. there is no file for "de-ch"
    $file = "$LoadLanguageDir/$file" if defined $LoadLanguageDir;
    if (IsFile($file)) {
      do $file;
      do "$ConfigFile-$Lang{$_}" if IsFile("$ConfigFile-$Lang{$_}");
      $CurrentLanguage = $Lang{$_};
      last;
    }
  }
}

# Must load language dependent config files before running init code for
# gotobar.pl and similar extensions.
unshift(@MyInitVariables, \&LoadLanguage);