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# Portions Copyright 2000 Tobias Brox <tobix@cpan.org> 

=head1 NAME

  RT::Template - RT's template object

=head1 SYNOPSIS

  use RT::Template;

=head1 DESCRIPTION


=head1 METHODS


=cut


package RT::Template;

use strict;
use warnings;
no warnings qw(redefine);

use Text::Template;
use MIME::Entity;
use MIME::Parser;

sub _Accessible {
    my $self = shift;
    my %Cols = (
        id            => 'read',
        Name          => 'read/write',
        Description   => 'read/write',
        Type          => 'read/write',    #Type is one of Action or Message
        Content       => 'read/write',
        Queue         => 'read/write',
        Creator       => 'read/auto',
        Created       => 'read/auto',
        LastUpdatedBy => 'read/auto',
        LastUpdated   => 'read/auto'
    );
    return $self->SUPER::_Accessible( @_, %Cols );
}

sub _Set {
    my $self = shift;
    
    unless ( $self->CurrentUserHasQueueRight('ModifyTemplate') ) {
        return ( 0, $self->loc('Permission Denied') );
    }
    return $self->SUPER::_Set( @_ );
}

=head2 _Value

Takes the name of a table column. Returns its value as a string,
if the user passes an ACL check, otherwise returns undef.

=cut

sub _Value {
    my $self  = shift;

    unless ( $self->CurrentUserHasQueueRight('ShowTemplate') ) {
        return undef;
    }
    return $self->__Value( @_ );

}

=head2 Load <identifer>

Load a template, either by number or by name.

Note that loading templates by name using this method B<is
ambiguous>. Several queues may have template with the same name
and as well global template with the same name may exist.
Use L</LoadGlobalTemplate> and/or L<LoadQueueTemplate> to get
precise result.

=cut

sub Load {
    my $self       = shift;
    my $identifier = shift;
    return undef unless $identifier;

    if ( $identifier =~ /\D/ ) {
        return $self->LoadByCol( 'Name', $identifier );
    }
    return $self->LoadById( $identifier );
}

=head2 LoadGlobalTemplate NAME

Load the global template with the name NAME

=cut

sub LoadGlobalTemplate {
    my $self = shift;
    my $name = shift;

    return ( $self->LoadQueueTemplate( Queue => 0, Name => $name ) );
}

=head2 LoadQueueTemplate (Queue => QUEUEID, Name => NAME)

Loads the Queue template named NAME for Queue QUEUE.

Note that this method doesn't load a global template with the same name
if template in the queue doesn't exist. THe following code can be used:

    $template->LoadQueueTemplate( Queue => $queue_id, Name => $template_name );
    unless ( $template->id ) {
        $template->LoadGlobalTemplate( $template_name );
        unless ( $template->id ) {
            # no template
            ...
        }
    }
    # ok, template either queue's or global
    ...

=cut

sub LoadQueueTemplate {
    my $self = shift;
    my %args = (
        Queue => undef,
        Name  => undef,
        @_
    );

    return ( $self->LoadByCols( Name => $args{'Name'}, Queue => $args{'Queue'} ) );

}

=head2 Create

Takes a paramhash of Content, Queue, Name and Description.
Name should be a unique string identifying this Template.
Description and Content should be the template's title and content.
Queue should be 0 for a global template and the queue # for a queue-specific 
template.

Returns the Template's id # if the create was successful. Returns undef for
unknown database failure.

=cut

sub Create {
    my $self = shift;
    my %args = (
        Content     => undef,
        Queue       => 0,
        Description => '[no description]',
        Type        => 'Action', #By default, template are 'Action' templates
        Name        => undef,
        @_
    );

    unless ( $args{'Queue'} ) {
        unless ( $self->CurrentUser->HasRight(Right =>'ModifyTemplate', Object => $RT::System) ) {
            return ( undef, $self->loc('Permission Denied') );
        }
        $args{'Queue'} = 0;
    }
    else {
        my $QueueObj = new RT::Queue( $self->CurrentUser );
        $QueueObj->Load( $args{'Queue'} ) || return ( undef, $self->loc('Invalid queue') );
    
        unless ( $QueueObj->CurrentUserHasRight('ModifyTemplate') ) {
            return ( undef, $self->loc('Permission Denied') );
        }
        $args{'Queue'} = $QueueObj->Id;
    }

    my $result = $self->SUPER::Create(
        Content     => $args{'Content'},
        Queue       => $args{'Queue'},
        Description => $args{'Description'},
        Name        => $args{'Name'},
    );

    return ($result);

}

=head2 Delete

Delete this template.

=cut

sub Delete {
    my $self = shift;

    unless ( $self->CurrentUserHasQueueRight('ModifyTemplate') ) {
        return ( 0, $self->loc('Permission Denied') );
    }

    return ( $self->SUPER::Delete(@_) );
}

=head2 IsEmpty

Returns true value if content of the template is empty, otherwise
returns false.

=cut

sub IsEmpty {
    my $self = shift;
    my $content = $self->Content;
    return 0 if defined $content && length $content;
    return 1;
}

=head2 MIMEObj

Returns L<MIME::Entity> object parsed using L</Parse> method. Returns
undef if last call to L</Parse> failed or never be called.

Note that content of the template is UTF-8, but L<MIME::Parser> is not
good at handling it and all data of the entity should be treated as
octets and converted to perl strings using Encode::decode_utf8 or
something else.

=cut

sub MIMEObj {
    my $self = shift;
    return ( $self->{'MIMEObj'} );
}

=head2 Parse

This routine performs L<Text::Template> parsing on the template and then
imports the results into a L<MIME::Entity> so we can really use it. Use
L</MIMEObj> method to get the L<MIME::Entity> object.

Takes a hash containing Argument, TicketObj, and TransactionObj and other
arguments that will be available in the template's code. TicketObj and
TransactionObj are not mandatory, but highly recommended.

It returns a tuple of (val, message). If val is false, the message contains
an error message.

=cut

sub Parse {
    my $self = shift;
    my ($rv, $msg);


    if ($self->Content =~ m{^Content-Type:\s+text/html\b}im) {
        local $RT::Transaction::PreferredContentType = 'text/html';
        ($rv, $msg) = $self->_Parse(@_);
    }
    else {
        ($rv, $msg) = $self->_Parse(@_);
    }

    return ($rv, $msg) unless $rv;

    my $mime_type   = $self->MIMEObj->mime_type;
    if (defined $mime_type and $mime_type eq 'text/html') {
        $self->_DowngradeFromHTML(@_);
    }

    return ($rv, $msg);
}

sub _Parse {
    my $self = shift;

    # clear prev MIME object
    $self->{'MIMEObj'} = undef;

    #We're passing in whatever we were passed. it's destined for _ParseContent
    my ($content, $msg) = $self->_ParseContent(@_);
    return ( 0, $msg ) unless defined $content && length $content;

    if ( $content =~ /^\S/s && $content !~ /^\S+:/ ) {
        $RT::Logger->error(
            "Template #". $self->id ." has leading line that doesn't"
            ." look like header field, if you don't want to override"
            ." any headers and don't want to see this error message"
            ." then leave first line of the template empty"
        );
        $content = "\n".$content;
    }

    my $parser = MIME::Parser->new();
    $parser->output_to_core(1);
    $parser->tmp_to_core(1);
    $parser->use_inner_files(1);

    ### Should we forgive normally-fatal errors?
    $parser->ignore_errors(1);
    # MIME::Parser doesn't play well with perl strings
    utf8::encode($content);
    $self->{'MIMEObj'} = eval { $parser->parse_data( \$content ) };
    if ( my $error = $@ || $parser->last_error ) {
        $RT::Logger->error( "$error" );
        return ( 0, $error );
    }

    # Unfold all headers
    $self->{'MIMEObj'}->head->unfold;

    return ( 1, $self->loc("Template parsed") );

}

# Perform Template substitutions on the template

sub _ParseContent {
    my $self = shift;
    my %args = (
        Argument       => undef,
        TicketObj      => undef,
        TransactionObj => undef,
        @_
    );

    unless ( $self->CurrentUserHasQueueRight('ShowTemplate') ) {
        return (undef, $self->loc("Permission Denied"));
    }

    if ( $self->IsEmpty ) {
        return ( undef, $self->loc("Template is empty") );
    }

    my $content = $self->SUPER::_Value('Content');
    # We need to untaint the content of the template, since we'll be working
    # with it
    $content =~ s/^(.*)$/$1/;
    my $template = Text::Template->new(
        TYPE   => 'STRING',
        SOURCE => $content
    );

    $args{'Ticket'} = delete $args{'TicketObj'} if $args{'TicketObj'};
    $args{'Transaction'} = delete $args{'TransactionObj'} if $args{'TransactionObj'};
    $args{'Requestor'} = eval { $args{'Ticket'}->Requestors->UserMembersObj->First->Name }
        if $args{'Ticket'};
    $args{'rtname'}    = RT->Config->Get('rtname');
    if ( $args{'Ticket'} ) {
        my $t = $args{'Ticket'}; # avoid memory leak
        $args{'loc'} = sub { $t->loc(@_) };
    } else {
        $args{'loc'} = sub { $self->loc(@_) };
    }

    foreach my $key ( keys %args ) {
        next unless ref $args{ $key };
        next if ref $args{ $key } =~ /^(ARRAY|HASH|SCALAR|CODE)$/;
        my $val = $args{ $key };
        $args{ $key } = \$val;
    }


    my $is_broken = 0;
    my $retval = $template->fill_in(
        HASH => \%args,
        BROKEN => sub {
            my (%args) = @_;
            $RT::Logger->error("Template parsing error: $args{error}")
                unless $args{error} =~ /^Died at /; # ignore intentional die()
            $is_broken++;
            return undef;
        }, 
    );
    return ( undef, $self->loc('Template parsing error') ) if $is_broken;

    return ($retval);
}

sub _DowngradeFromHTML {
    my $self = shift;
    my $orig_entity = $self->MIMEObj;

    my $new_entity = $orig_entity->dup; # this will fail badly if we go away from InCore parsing
    $new_entity->head->mime_attr( "Content-Type" => 'text/plain' );
    $new_entity->head->mime_attr( "Content-Type.charset" => 'utf-8' );

    $orig_entity->head->mime_attr( "Content-Type" => 'text/html' );
    $orig_entity->head->mime_attr( "Content-Type.charset" => 'utf-8' );
    $orig_entity->make_multipart('alternative', Force => 1);

    require HTML::FormatText;
    require HTML::TreeBuilder;
    my $tree = HTML::TreeBuilder->new_from_content(
        $new_entity->bodyhandle->as_string
    );
    $new_entity->bodyhandle(MIME::Body::InCore->new(
        \(scalar HTML::FormatText->new(
            leftmargin  => 0,
            rightmargin => 78,
        )->format( $tree ))
    ));
    $tree->delete;

    $orig_entity->add_part($new_entity, 0); # plain comes before html
    $self->{MIMEObj} = $orig_entity;

    return;
}

=head2 CurrentUserHasQueueRight

Helper function to call the template's queue's CurrentUserHasQueueRight with the passed in args.

=cut

sub CurrentUserHasQueueRight {
    my $self = shift;
    return ( $self->QueueObj->CurrentUserHasRight(@_) );
}

1;