# -*- Mode: perl; indent-tabs-mode: nil -*-
#
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is the Bugzilla Bug Tracking System.
#
# The Initial Developer of the Original Code is Netscape Communications
# Corporation. Portions created by Netscape are
# Copyright (C) 1998 Netscape Communications Corporation. All
# Rights Reserved.
#
# Contributor(s): Myk Melez <myk@mozilla.org>
#                 Zach Lipton <zach@zachlipton.com>
#

package Bugzilla::Template::Plugin::Hook;

use strict;

use Bugzilla::Config;
use Bugzilla::Template;
use Bugzilla::Util;
use Bugzilla::Error;
use File::Spec;

use base qw(Template::Plugin);

sub load {
    my ($class, $context) = @_;
    return $class;
}

sub new {
    my ($class, $context) = @_;
    return bless { _CONTEXT => $context }, $class;
}

sub process {
    my ($self, $hook_name) = @_;

    my $paths = $self->{_CONTEXT}->{LOAD_TEMPLATES}->[0]->paths;
    my $template = $self->{_CONTEXT}->stash->{component}->{name};
    my @hooks = ();
    
    # sanity check:
    if (!$template =~ /[\w\.\/\-_\\]+/) {
        ThrowCodeError('template_invalid', { name => $template});
    }

    # also get extension hook files that live in extensions/:
    # parse out the parts of the template name
    my ($vol, $subpath, $filename) = File::Spec->splitpath($template);
    $subpath = $subpath || '';
    $filename =~ m/(.*)\.(.*)\.tmpl/;
    my $templatename = $1;
    my $type = $2;
    # munge the filename to create the extension hook filename:
    my $extensiontemplate = $subpath.'/'.$templatename.'-'.$hook_name.'.'.$type.'.tmpl';
    my @extensions = glob($Bugzilla::Config::extensionsdir."/*");
    my @usedlanguages = getLanguages();
    foreach my $extension (@extensions) {
        foreach my $language (@usedlanguages) {
            my $file = $extension.'/template/'.$language.'/'.$extensiontemplate;
            if (-e $file) {
                # tt is stubborn and won't take a template file not in its
                # include path, so we open a filehandle and give it to process()
                # so the hook gets invoked:
                open (my $fh, $file);
                push(@hooks, $fh);
            }
        }
    }
    
    # we keep this too since you can still put hook templates in 
    # template/en/custom/hook
    foreach my $path (@$paths) {
        my @files = glob("$path/hook/$template/$hook_name/*.tmpl");

        # Have to remove the templates path (INCLUDE_PATH) from the
        # file path since the template processor auto-adds it back.
        @files = map($_ =~ /^$path\/(.*)$/ ? $1 : {}, @files);

        # Add found files to the list of hooks, but removing duplicates,
        # which can happen when there are identical hooks or duplicate
        # directories in the INCLUDE_PATH (the latter probably being a TT bug).
        foreach my $file (@files) {
            push(@hooks, $file) unless grep($file eq $_, @hooks);
        }
    }

    my $output;
    foreach my $hook (@hooks) {
        $output .= $self->{_CONTEXT}->process($hook);
    }
    return $output;
}

# get a list of languages we accept so we can find the hook 
# that corresponds to our desired languages:
sub getLanguages() {
    my $languages = trim(Param('languages'));
    if (not ($languages =~ /,/)) { # only one language
        return $languages;
    }
    my @languages       = Bugzilla::Template::sortAcceptLanguage($languages);
    my @accept_language = Bugzilla::Template::sortAcceptLanguage($ENV{'HTTP_ACCEPT_LANGUAGE'} || "" );
    my @usedlanguages;
    foreach my $lang (@accept_language) {
        if(my @found = grep /^\Q$lang\E(-.+)?$/i, @languages) {
            push (@usedlanguages, @found);
        }
    }
    return @usedlanguages;
}

1;

__END__

=head1 NAME

Bugzilla::Template::Plugin::Hook

=head1 DESCRIPTION

Template Toolkit plugin to process hooks added into templates by extensions.

=head1 SEE ALSO

L<Template::Plugin>
L<http:E<sol>E<sol>www.bugzilla.orgE<sol>docsE<sol>tipE<sol>htmlE<sol>customization.html>
L<http:E<sol>E<sol>bugzilla.mozilla.orgE<sol>show_bug.cgi?id=229658>
L<http:E<sol>E<sol>bugzilla.mozilla.orgE<sol>show_bug.cgi?id=298341>