package WebGUI;


our $VERSION = '7.8.1';
our $STATUS = 'beta';


=head1 LEGAL

 -------------------------------------------------------------------
  WebGUI is Copyright 2001-2009 Plain Black Corporation.
 -------------------------------------------------------------------
  Please read the legal notices (docs/legal.txt) and the license
  (docs/license.txt) that came with this distribution before using
  this software.
 -------------------------------------------------------------------
  http://www.plainblack.com                     info@plainblack.com
 -------------------------------------------------------------------

=cut

use strict;
use MIME::Base64 ();
use WebGUI::Config;
use WebGUI::Pluggable;
use WebGUI::Session;
use WebGUI::User;
use Moose;
use Plack::Request;

has root => ( is => 'ro', isa => 'Str', default => '/data/WebGUI' );
has site => ( is => 'ro', isa => 'Str', default => 'dev.localhost.localdomain.conf' );
has session => ( is => 'rw', isa => 'WebGUI::Session' );
has config  => ( is => 'rw', isa => 'WebGUI::Config' );

use overload q(&{}) => sub { shift->psgi_app }, fallback => 1;

=head1 NAME

Package WebGUI

=head1 DESCRIPTION

PSGI handler for WebGUI.

=head1 SYNOPSIS

 use WebGUI;

=head1 SUBROUTINES

These subroutines are available from this package:

=cut

around BUILDARGS => sub {
    my $orig = shift;
    my $class = shift;
    
    # Make constructor work as:
    #   WebGUI->new( $site )
    # In addition to the more verbose:
    #   WebGUI->new( root => $root, site => $site )
    if (@_ eq 1) {
        return $class->$orig(site => $_[0] );
    } else {
        return $class->$orig(@_);
    }
};

sub BUILD {
	my $self = shift;
	
	# Instantiate the WebGUI::Config object
	my $config = WebGUI::Config->new( $self->root, $self->site );
	$self->config( $config );
}

sub psgi_app {
    my $self = shift;
    return $self->{psgi_app} ||= $self->compile_psgi_app;
}

sub compile_psgi_app {
    my $self = shift;
    
    my $app = sub {
        my $env = shift;
        my $request = Plack::Request->new($env); # This could also be WebGUI::Request
        my $response = $self->dispatch($request);
        return $response;
    };
    
    my $config = $self->config;

    # Extras
    use Plack::Middleware::Static;
    my $extrasURL = $config->get('extrasURL');
    my $extrasPath = $config->get('extrasPath');
    $app = Plack::Middleware::Static->wrap($app, 
        path => sub { s{^$extrasURL/}{} },
        root => "$extrasPath/",
    );
    
    # Uploads
    my $uploadsURL = $config->get('uploadsURL');
    my $uploadsPath = $config->get('uploadsPath');
    $app = Plack::Middleware::Static->wrap($app, 
        path => sub { s{^$uploadsURL/}{} }, 
        root => "$uploadsPath/", 
    );

    return $app;
}

sub dispatch {
    my ( $self, $request ) = @_;
    
    my $config = $self->config;
    
    # determine session id
	my $sessionId = $request->cookies->{$config->getCookieName};

    # Instantiate the session object
    my $session = $self->session( WebGUI::Session->open($self->root, $config, $request, $sessionId) );
    
    for my $handler (@{$config->get("contentHandlers")}) {
        my $output = eval { WebGUI::Pluggable::run($handler, "handler", [ $session ] )};
        if ( my $e = WebGUI::Error->caught ) {
            $session->errorHandler->error($e->package.":".$e->line." - ".$e->error);
            $session->errorHandler->debug($e->package.":".$e->line." - ".$e->trace);
        }
        elsif ( $@ ) {
            $session->errorHandler->error( $@ );
        }
        else {
            # We decide what to do next depending on what the contentHandler returned
            
            # "chunked" or "empty" means it took care of its own output needs
            if (defined $output && ( $output eq "chunked" || $output eq "empty" )) {
                if ($session->errorHandler->canShowDebug()) {
                    $session->output->print($session->errorHandler->showDebug(),1);
                }
                last;
            }
            # non-empty output should be used as the response body
            elsif (defined $output && $output ne "") {
                # Auto-set the headers
                $session->http->sendHeader; # TODO: should be renamed setHeader
                
                # Use contentHandler's return value as the output
                $session->output->print($output);
                if ($session->errorHandler->canShowDebug()) {
                    $session->output->print($session->errorHandler->showDebug(),1);
                }
                last;
            }
            # Keep processing for success codes
            elsif ($session->http->getStatus < 200 || $session->http->getStatus > 299) {
                $session->http->sendHeader;
                last;
            }
        }
    }
    $session->close;

    return $session->response->finalize;
}

no Moose;
__PACKAGE__->meta->make_immutable;

1;