<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle 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 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.


require_once dirname(__FILE__) . '../../../../../../config.php';
require_once dirname(__FILE__) . '/../../lib.php';
require_once $CFG->libdir.'/gradelib.php';
require_once 'edit_form.php';

$courseid  	= optional_param('id', SITEID, PARAM_INT);
$action   	= optional_param('action', '', PARAM_ALPHA);
$edit		= optional_param('edit', null, PARAM_INT);

$strgrades = get_string('grades');
$pagename  = get_string('letters', 'grades');
$returnurl = $CFG->wwwroot . '/plugins/gradebook/options/settings/letter/index.php?id='.$courseid.'&view=settings_letter';
$admin = false;

// Make sure user has permission in this context
if (!$course = get_record('course', 'id', $courseid)) {
    print_error('nocourseid');
}
require_login($course);

$context = get_context_instance(CONTEXT_COURSE, $course->id);
if (!has_capability('moodle/grade:manage', $context) and !has_capability('moodle/grade:manageletters', $context)) {
    error('Missing permission to view letter grades');
}

// Create form
$letters = grade_get_letters($context);
$num = count($letters) + 3;
$mform = new edit_letter_form(null, array('num'=>$num, 'admin'=>$admin));
	
// Process form data
if ($mform->is_cancelled()) {
    redirect($returnurl);
} else if ($data = $mform->get_data()) {
    if (!$admin and empty($data->override)) {
        delete_records('grade_letters', 'contextid', $context->id);
        redirect($returnurl);
    }

    $letters = array();
    for($i=1; $i<$num+1; $i++) {
        $gradelettername = 'gradeletter'.$i;
        $gradeboundaryname = 'gradeboundary'.$i;

        if (array_key_exists($gradeboundaryname, $data) and $data->$gradeboundaryname != -1) {
            $letter = trim($data->$gradelettername);
            if ($letter == '') {
                continue;
            }
            $letters[$data->$gradeboundaryname] = $letter;
        }
    }
    krsort($letters, SORT_NUMERIC);

    $old_ids = array();
    if ($records = get_records('grade_letters', 'contextid', $context->id, 'lowerboundary ASC', 'id')) {
        $old_ids = array_keys($records);
    }

    foreach($letters as $boundary=>$letter) {
        $record = new object();
        $record->letter        = $letter;
        $record->lowerboundary = $boundary;
        $record->contextid     = $context->id;

        if ($old_id = array_pop($old_ids)) {
            $record->id = $old_id;
            update_record('grade_letters', $record);
        } else {
            insert_record('grade_letters', $record);
        }
    }

    foreach($old_ids as $old_id) {
        delete_records('grade_letters', 'id', $old_id);
    }
    redirect($returnurl);
}

// Print out page
print_grade_page_head($courseid, 'letter', 'view', get_string('gradeletters', 'grades'));
if (has_capability('moodle/grade:edit', $context) && $edit==1){
	// Generate data for form

	$data = new object();
	$data->id = $courseid;

	$i = 1;
	foreach ($letters as $boundary=>$letter) {
		$gradelettername = 'gradeletter'.$i;
		$gradeboundaryname = 'gradeboundary'.$i;

		$data->$gradelettername   = $letter;
		$data->$gradeboundaryname = $boundary;
		$i++;
	}
	$data->override = record_exists('grade_letters', 'contextid', $context->id);
	$mform->set_data($data);

	$mform->display();
}
else {
	$letters = grade_get_letters($context);

	$data = array();

	$max = 100;
	foreach($letters as $boundary=>$letter) {
		$line = array();
		$line[] = format_float($max,2).' %';
		$line[] = format_float($boundary,2).' %';
		$line[] = format_string($letter);
		$data[] = $line;
		$max = $boundary - 0.01;
	}

	$table = new object();
	$table->head  = array(get_string('max', 'grades'), get_string('min', 'grades'), get_string('letter', 'grades'));
	$table->size  = array('30%', '30%', '40%');
	$table->align = array('left', 'left', 'left');
	$table->width = '30%';
	$table->data  = $data;
	print_table($table);
}
print_footer($course);
?>