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<?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/>.

/**
 * Self completion block.
 *
 * @package   block_selfcompletion
 * @copyright 1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once($CFG->libdir.'/completionlib.php');

/**
 * Self course completion marking
 * Let's a user manually complete a course
 *
 * Will only display if the course has completion enabled,
 * there is a self completion criteria, and the logged in user is yet
 * to complete the course.
 */
class block_selfcompletion extends block_base {

public function init() {
        $this->title = get_string('pluginname', 'block_selfcompletion');
    }

function applicable_formats() {
        return array('course' => true);
    }

public function get_content() {
        global $CFG, $USER;

// If content is cached
        if ($this->content !== NULL) {
          return $this->content;
        }

// Create empty content
        $this->content = new stdClass;

// Can edit settings?
        $can_edit = has_capability('moodle/course:update', context_course::instance($this->page->course->id));

// Get course completion data
        $info = new completion_info($this->page->course);

// Don't display if completion isn't enabled!
        if (!completion_info::is_enabled_for_site()) {
            if ($can_edit) {
                $this->content->text = get_string('completionnotenabledforsite', 'completion');
            }
            return $this->content;

} else if (!$info->is_enabled()) {
            if ($can_edit) {
                $this->content->text = get_string('completionnotenabledforcourse', 'completion');
            }
            return $this->content;
        }

// Get this user's data
        $completion = $info->get_completion($USER->id, COMPLETION_CRITERIA_TYPE_SELF);

// Check if self completion is one of this course's criteria
        if (empty($completion)) {
            if ($can_edit) {
                $this->content->text = get_string('selfcompletionnotenabled', 'block_selfcompletion');
            }
            return $this->content;
        }

// Check this user is enroled
        if (!$info->is_tracked_user($USER->id)) {
            $this->content->text = get_string('nottracked', 'completion');
            return $this->content;
        }

// Is course complete?
        if ($info->is_course_complete($USER->id)) {
            $this->content->text = get_string('coursealreadycompleted', 'completion');
            return $this->content;

// Check if the user has already marked themselves as complete
        } else if ($completion->is_complete()) {
            $this->content->text = get_string('alreadyselfcompleted', 'block_selfcompletion');
            return $this->content;

// If user is not complete, or has not yet self completed
        } else {
            $this->content->text = '';
            $this->content->footer = '<br /><a href="'.$CFG->wwwroot.'/course/togglecompletion.php?course='.$this->page->course->id.'">';
            $this->content->footer .= get_string('completecourse', 'block_selfcompletion').'</a>...';
        }

return $this->content;
    }
}