package EPrints::Plugin::Screen::REF::Report::REF2::Listing;

use EPrints::Plugin::Screen::REF;
@ISA = ( 'EPrints::Plugin::Screen::REF' );

use strict;

our @STATS = (
	total_users => sub {
		my( $s ) = @_;

		$_[1] = {} if !defined $_[1];

		$_[1]{$s->value( "user_id" )}++;

		return scalar keys %{$_[1]};
	},
	total => sub {
		my( $s ) = @_;

		$_[1]++;

		return $_[1];
	},
	mean_self_rating => sub {
		my( $s ) = @_;

		$_[1] = [] if !defined $_[1];

		$_[1][0] += $s->value( "self_rating" );
		$_[1][1] ++;

		return $_[1][0] / $_[1][1];
	},
);

sub new
{
	my( $class, %params ) = @_;

	my $self = $class->SUPER::new(%params);

        $self->{appears} = [
                {
                        place => "ref_tools",
                        position => 200,
                }
        ];

	return $self;
}

sub can_be_viewed
{
	my( $self ) = @_;
	
	my $user = $self->{session}->current_user;

	# who can view the reports?
	# main REF Admins? role = ?
	# people who have their ref_uoa_role field set

	# return 1 if( defined $user && $user->has_role( 'ref/admin' ) );
	
	return 0 if !defined $self->current_benchmark;

	return 1 if( defined $user && $user->exists_and_set( 'ref_uoa_role' ) );

	return 0;
}

# can the user access ALL the reports (eg. Admin)? If so, show the UoA tree?
# can the user access a single report (UoA admin)? If so, show the report for that UoA
# otherwise show the personal report?
sub render
{
	my( $self ) = @_;

	my $session = $self->{session};
	my $benchmark = $self->{processor}->{benchmark};

	my $chunk = $session->make_doc_fragment;

	my $user = $session->current_user;

	my $ref_roles = $user->get_value( 'ref_uoa_role' );

	return $chunk unless( EPrints::Utils::is_set( $ref_roles ) );

	# render current benchmark
	$chunk->appendChild( $self->render_benchmarks );

        my $container = $session->make_element( 'div', align => 'center', style => 'width:100%;text-align:center' );
        $chunk->appendChild( $container );

        my $table = $session->make_element( 'table', style=> 'margin-left:auto;margin-right:auto;' );
        $container->appendChild( $table );

	my $tr = $table->appendChild( $session->make_element( "tr" ) );
	my $th = $tr->appendChild( $session->make_element( "th" ) );
	foreach my $id (map { $STATS[$_] } grep { $_ % 2 == 0 } 0..$#STATS)
	{
		my $th = $tr->appendChild( $session->make_element( "th" ) );
		$th->appendChild( $session->html_phrase( "ref:stat_$id" ) );
	}

	# link to the available reports
	foreach my $uoa ( @$ref_roles )
	{
		my $subject = $session->dataset( 'subject' )->dataobj( $uoa );
		next if !defined $subject;

		$table->appendChild( $self->render_result_row( $subject ) );
	}

	return $chunk;
}

sub render_result_row
{
	my( $self, $subject ) = @_;

	my $session = $self->{session};
	my $benchmark = $self->{processor}->{benchmark};

	my $href = URI->new( $session->config( "userhome" ) );
	$href->query_form(
		screen => "REF::Report::REF2::View",
		uoa => $subject->id,
	);
	my $link = $session->render_link( $href );

	my @ctx = map { undef } @STATS;
	my %results;

	$benchmark->uoa_selections( $subject )->map(sub {
		(undef, undef, my $selection) = @_;

		# perform the compound AND
		my $ok = 0;
		for(@{$selection->value( "ref" )})
		{
			$ok = 1, last
				if $_->{benchmarkid} == $benchmark->id && $_->{uoa} eq $subject->id;
		}
		return if !$ok;

		foreach my $i (grep { $_ % 2 == 0 } 0..$#STATS)
		{
			my( $id, $f ) = @STATS[$i,$i+1];
			$results{$id} = &$f( $selection, $ctx[$i] );
		}
	});

	my $tr = $session->make_element( "tr" );
	# title
	{
		my $td = $tr->appendChild( $session->make_element( "td" ) );
		$link->appendChild( $subject->render_description );
		$td->appendChild( $link );
	}
	foreach my $id (map { $STATS[$_] } grep { $_ % 2 == 0 } 0..$#STATS)
	{
		my $td = $tr->appendChild( $session->make_element( "td" ) );
		$results{$id} = sprintf( "%.3f", $results{$id} ) if( defined $results{$id} && $results{$id} =~ /^\d+\.\d+$/ );
		$td->appendChild( $session->make_text( $results{$id} || '0' ) );
	}

	return $tr;
}

1;