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package RT::Interface::Web::Request;

use strict;
use warnings;

our $VERSION = '0.30';
use base qw(HTML::Mason::Request);

sub new {
    my $class = shift;

    my $new_class = $HTML::Mason::ApacheHandler::VERSION ?
        'HTML::Mason::Request::ApacheHandler' :
            $HTML::Mason::CGIHandler::VERSION ?
                'HTML::Mason::Request::CGI' :
                    'HTML::Mason::Request';

    $class->alter_superclass( $new_class );
    $class->valid_params( %{ $new_class->valid_params } );
    return $class->SUPER::new(@_);
}

# XXX TODO: This alter_superclass replaces teh funcitonality in Mason 1.39 
# with code which doesn't trigger a bug in Perl 5.10. 
# (Perl 5.10.0 does NOT take kindly to having its @INC entries changed)
# http://rt.perl.org/rt3/Public/Bug/Display.html?id=54566
#
# This routine can be removed when either: 
#   * RT depends on a version of mason which contains this fix
#   * Perl 5.10.0 is not supported for running RT
sub alter_superclass {
    my $class = shift;
    my $new_super = shift;
    my $isa_ref;
    { no strict 'refs'; my @entries = @{$class."::ISA"}; $isa_ref = \@entries; }

    # handles multiple inheritance properly and preserve
    # inheritance order
    for ( my $x = 0; $x <= $#{$isa_ref} ; $x++ ) {
        if ( $isa_ref->[$x]->isa('HTML::Mason::Request') ) {
            my $old_super = $isa_ref->[$x];
                $isa_ref->[$x] = $new_super
            if ( $old_super ne $new_super );
            last;
        }
    } 

    { no strict 'refs'; @{$class."::ISA"} = @$isa_ref; }
    $class->valid_params( %{ $class->valid_params } );
}


=head2 callback

Method replaces deprecated component C<Element/Callback>.

Takes hash with optional C<CallbackPage>, C<CallbackName>
and C<CallbackOnce> arguments, other arguments are passed
throught to callback components.

=over 4

=item CallbackPage

Page path relative to the root, leading slash is mandatory.
By default is equal to path of the caller component.

=item CallbackName

Name of the callback. C<Default> is used unless specified.

=item CallbackOnce

By default is false, otherwise runs callbacks only once per
process of the server. Such callbacks can be used to fill
structures.

=back

Searches for callback components in
F<< /Callbacks/<any dir>/CallbackPage/CallbackName >>, for
example F</Callbacks/MyExtension/autohandler/Default> would
be called as default callback for F</autohandler>.

=cut

{
my %cache = ();
my %called = ();
sub callback {
    my ($self, %args) = @_;

    my $name = delete $args{'CallbackName'} || 'Default';
    my $page = delete $args{'CallbackPage'} || $self->callers(0)->path;
    unless ( $page ) {
        $RT::Logger->error("Couldn't get a page name for callbacks");
        return;
    }

    my $CacheKey = "$page--$name";
    return 1 if delete $args{'CallbackOnce'} && $called{ $CacheKey };
    $called{ $CacheKey } = 1;

    my $callbacks = $cache{ $CacheKey };
    unless ( $callbacks ) {
        $callbacks = [];
        my $path  = "/Callbacks/*$page/$name";
        my @roots = map $_->[1],
                        $HTML::Mason::VERSION <= 1.28
                            ? $self->interp->resolver->comp_root_array
                            : $self->interp->comp_root_array;

        my %seen;
        @$callbacks = (
            sort grep defined && length,
            # Skip backup files, files without a leading package name,
            # and files we've already seen
            grep !$seen{$_}++ && !m{/\.} && !m{~$} && m{^/Callbacks/[^/]+\Q$page/$name\E$},
            map $self->interp->resolver->glob_path($path, $_),
            @roots
        );
        foreach my $comp (keys %seen) {
            next unless $seen{$comp} > 1;
            $RT::Logger->error("Found more than one occurrence of the $comp callback.  This may cause only one of the callbacks to run.  Look for the duplicate Callback in your @roots");
        }

        $cache{ $CacheKey } = $callbacks unless RT->Config->Get('DevelMode');
    }

    my @rv;
    foreach my $cb ( @$callbacks ) {
        push @rv, scalar $self->comp( $cb, %args );
    }
    return @rv;
}
}

1;
