# The LearningOnline Network with CAPA
# Quick Student Grades Display
#
# $Id: lonquickgrades.pm,v 1.47 2009/02/26 16:17:30 schafran Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# Created Nov. 14, 2002 by Jeremy Bowers

package Apache::lonquickgrades;

use strict;
use Apache::Constants qw(:common :http);
use POSIX;
use Apache::loncommon;
use Apache::lonlocal;
use Apache::lonnet;
use Apache::grades;

sub handler {
    my $r = shift;
    return real_handler($r);
}

sub real_handler {
    my $r = shift;

    &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});

    # Handle header-only request
    if ($env{'browser.mathml'}) {
	&Apache::loncommon::content_type($r,'text/xml');
    } else {
	&Apache::loncommon::content_type($r,'text/html');
    }
    if ($r->header_only) {
	$r->send_http_header;
        return OK;
    }

    # Send header, don't cache this page
    &Apache::loncommon::no_cache($r);
    $r->send_http_header;

    my $showPoints = 
        $env{'course.'.$env{'request.course.id'}.'.grading'} eq 'standard';
    my $notshowSPRSlink = 
        $env{'course.'.$env{'request.course.id'}.'.grading'} eq 'external';

    # Create the nav map
    my $navmap = Apache::lonnavmaps::navmap->new();

    if (!defined($navmap)) {
        my $requrl = $r->uri;
        $env{'user.error.msg'} = "$requrl:bre:0:0:Navamp initialization failed.";
        return HTTP_NOT_ACCEPTABLE;
    }

    # Keep this hash in sync with %statusIconMap in lonnavmaps; they
    # should match color/icon
    my $res = $navmap->firstResource(); # temp resource to access constants
 
    # Header
    my $title = "Grading and Statistics";#$showPoints ? "Points Display" : "Completed Problems Display";
    my $brcrum = [{href=>"/adm/quickgrades",text => "Points Display"}];
    $r->print(&Apache::loncommon::start_page($title,undef,
                                            {'bread_crumbs' => $brcrum})
             );

    if (!$showPoints && !$notshowSPRSlink ) {
        $r->print('<p>'
                 .&mt('This screen shows how many problems (or problem parts) you have completed'
                     .', and how many you have not yet done.'
                     .' You can also look at [_1]a detailed score sheet[_2].'
                     ,'<a href="/adm/studentcalc">','</a>')
                 .'</p>');
    }

    $r->print('<p class="LC_info">'.&mt('This may take a few moments to display.').'</p>');

    $r->rflush();

    # End navmap using boilerplate

    my $iterator = $navmap->getIterator(undef, undef, undef, 1);
    my $depth = 1;
    $iterator->next(); # ignore first BEGIN_MAP
    my $curRes = $iterator->next();
    
    # General overview of the following: Walk along the course resources.
    # For every problem in the resource, tell its parent maps how many
    # parts and how many parts correct it has. After that, each map will
    # have a count of the total parts underneath it, correct and otherwise.
    # After that, we will walk through the course again and read off
    # maps in order, with their data. 
    # (If in the future people decide not to be cumulative, only add
    #  the counts to the parent map.)
    # For convenience, "totalParts" is also "totalPoints" when we're looking
    #  at points; I can't come up with a variable name that makes sense
    #  equally for both cases.

    my $totalParts = 0; my $totalPossible = 0; my $totalRight = 0;
    my $totalAttempted = 0;
    my $now = time();
    my $topLevelParts = 0; my $topLevelRight = 0; my $topLevelAttempted = 0;

    # Pre-run: Count parts correct
    while ( $depth > 0 ) {
        if ($curRes == $iterator->BEGIN_MAP()) {$depth++;}
        if ($curRes == $iterator->END_MAP()) { $depth--; }

        if (ref($curRes) && $curRes->is_problem() && !$curRes->randomout)
        {
            # Get number of correct, incorrect parts
            my $parts = $curRes->parts();
            my $partsRight = 0;
	    my $partsCount = 0;
	    my $partsAttempted = 0;
            my $stack = $iterator->getStack();
            
            for my $part (@{$parts}) {
		my $completionStatus = $curRes->getCompletionStatus($part);
		my $dateStatus = $curRes->getDateStatus($part);
		
                if ($completionStatus == $curRes->EXCUSED()) {
                    next;
                }
		if ($showPoints) {
		    my $score = 0;
		    # If we're not telling status and the answer date isn't passed yet, 
		    # it's an "attempted" point
		    if ((($curRes->problemstatus($part) eq 'no') ||
                        ($curRes->problemstatus($part) eq 'no_feedback_ever')) &&
			($dateStatus != $curRes->ANSWER_OPEN)) {
			my $status = $curRes->simpleStatus($part);
			if ($status == $curRes->ATTEMPTED) {
			    $partsAttempted += $curRes->weight($part);
			    $totalAttempted += $partsAttempted;
			}
		    } else {
			$score = &Apache::grades::compute_points($curRes->weight($part), $curRes->awarded($part));
		    }
		    $partsRight += $score;
		    $totalRight += $score;
		    $partsCount += $curRes->weight($part);

		    if ($curRes->opendate($part) < $now) {
			$totalPossible += $curRes->weight($part);
		    }
		    $totalParts += $curRes->weight($part);
		} else {
		    my $status = $curRes->simpleStatus($part);
		    my $thisright = 0;
		    $partsCount++;
		    if ($status == $curRes->CORRECT ||
			$status == $curRes->PARTIALLY_CORRECT ) {
			$partsRight++;
			$totalRight++;
			$thisright = 1;
		    }

		    if ($status == $curRes->ATTEMPTED) {
			$partsAttempted++;
			$totalAttempted++;
		    }
		    
		    my $dateStatus = $curRes->getDateStatus($part);
		    $totalParts++;
		    if ($curRes->opendate($part) < $now) {
			$totalPossible++;
		    }
		}
            }

            if ($depth == 1) { # in top-level only
		$topLevelParts += $partsCount;
		$topLevelRight += $partsRight;
		$topLevelAttempted += $partsAttempted;
	    }

            # Crawl down stack and record parts correct and total
            for my $res (@{$stack}) {
                if (ref($res) && $res->is_map()) {
                    if (!defined($res->{DATA}->{CHILD_PARTS})) {
                        $res->{DATA}->{CHILD_PARTS} = 0;
                        $res->{DATA}->{CHILD_CORRECT} = 0;
			$res->{DATA}->{CHILD_ATTEMPTED} = 0;
                    }
                    
                    $res->{DATA}->{CHILD_PARTS} += $partsCount;
                    $res->{DATA}->{CHILD_CORRECT} += $partsRight;
		    $res->{DATA}->{CHILD_ATTEMPTED} += $partsAttempted;
                }
            }
        }
        $curRes = $iterator->next();
    }

    $iterator = $navmap->getIterator(undef, undef, undef, 1);
    $depth = 1;
    $iterator->next(); # ignore first BEGIN_MAP
    $curRes = $iterator->next();

    my @start = (255, 255, 192);
    my @end   = (0, 192, 0);

    my $indentString = '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;';

    # Second pass: Print the maps.
    $r->print(&Apache::loncommon::start_data_table()
             .&Apache::loncommon::start_data_table_header_row()
             .'<th>'.&mt('Folder').'</th>');
    $title = &mt($showPoints ? "Points Scored" : "Done");
    if ($totalAttempted) {
	$title .= " / " . &mt("Attempted");
    }
    $r->print("<th>$title / ".&mt('Total').'</td>'
             .&Apache::loncommon::end_data_table_header_row());
    while ($depth > 0) {
        if ($curRes == $iterator->BEGIN_MAP()) {$depth++;}
        if ($curRes == $iterator->END_MAP()) { $depth--; }

        if (ref($curRes) && $curRes->is_map()) {
            my $title = $curRes->compTitle();
            
            my $correct = $curRes->{DATA}->{CHILD_CORRECT};
            my $total = $curRes->{DATA}->{CHILD_PARTS};
	    my $attempted = $curRes->{DATA}->{CHILD_ATTEMPTED};

            if ($total > 0) {
                my $ratio;
                $ratio = $correct / $total;
                my $color = mixColors(\@start, \@end, $ratio);
                $r->print(&Apache::loncommon::start_data_table_row()
                         .'<td style="background-color:'.$color.';">');
                
		my $thisIndent = '';
                for (my $i = 1; $i < $depth; $i++) { $thisIndent .= $indentString; }
                
                $r->print("$thisIndent$title</td>");
		if ($totalAttempted) {
		    $r->print('<td valign="top">'
                             .$thisIndent
                             .'<span class="LC_nobreak">'
                             .$correct.' / '.$attempted.' / '.$total
                             .'</span></td>'
                             .&Apache::loncommon::end_data_table_row()
                    );
		} else {
		    $r->print('<td valign="top">'
                             .$thisIndent
                             .'<span class="LC_nobreak">'
                             .$correct.' / '.$total
                             .'</span></td>'
                             .&Apache::loncommon::end_data_table_row());
		}
            }
        }

        $curRes = $iterator->next();
    }

    # If there were any problems at the top level, print an extra "catchall"
    if ($topLevelParts > 0) {
        my $ratio = $topLevelRight / $topLevelParts;
        my $color = mixColors(\@start, \@end, $ratio);
        $r->print(&Apache::loncommon::start_data_table_row()
                 .'<td style="background-color:'.$color.';">');
        $r->print(&mt("Problems Not Contained In A Folder")."</td><td>");
        $r->print("$topLevelRight / $topLevelParts</td>"
                 .&Apache::loncommon::end_data_table_row());
    }

    if ($showPoints) {
	my $maxHelpLink = Apache::loncommon::help_open_topic("Quick_Grades_Possibly_Correct");

	$title = $showPoints ? "Points" : "Parts Done";
	my $totaltitle = $showPoints ? &mt("Awarded Total Points") : &mt("Total Parts Done");
	$r->print(&Apache::loncommon::start_data_table_row()
                 .'<td colspan="2" align="right">'.$totaltitle.': <b>'.$totalRight.'</b><br>');
	$r->print(&mt("Max Possible To Date")." $maxHelpLink: <b>$totalPossible</b><br>");
	$title = $showPoints ? "Points" : "Parts";
	$r->print(&mt("Total $title In Course").': <b>'.$totalParts.'</b></td>'
                 .&Apache::loncommon::end_data_table_row());
    }

    $r->print(&Apache::loncommon::end_data_table()
             .&Apache::loncommon::end_page());

    return OK;
}

# Pass this two refs to arrays for the start and end color, and a number
# from 0 to 1 for how much of the latter you want to mix in. It will
# return a string ready to show ("#FFC309");
sub mixColors {
    my $start = shift;
    my $end = shift;
    my $ratio = shift;
    
    my ($a,$b);
    my $final = "";
    $a = $start->[0]; $b = $end->[0];
    my $mix1 = POSIX::floor((1-$ratio)*$a + $ratio*$b);
    $a = $start->[1]; $b = $end->[1];
    my $mix2 = POSIX::floor((1-$ratio)*$a + $ratio*$b);
    $a = $start->[2]; $b = $end->[2];
    my $mix3 = POSIX::floor((1-$ratio)*$a + $ratio*$b);

    $final = sprintf "%02x%02x%02x", $mix1, $mix2, $mix3;
    return "#" . $final;
}

1;