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1 efrain 1 
<?php
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class block_cursos_catalogo_ajax_renderer extends plugin_renderer_base
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{
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    public function procesar()
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    {
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        global $USER, $DB, $CFG;
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        require_once $CFG->dirroot . "/blocks/course_list/block_course_list.php";
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        $is_admin = false;
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        $admins = get_admins();
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        foreach ($admins as $admin) {
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            if ($USER->id == $admin->id) {
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                $is_admin = true;
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                break;
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            }
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        }
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        $category_ids = [];
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        if ($is_admin) {
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            $mycourses = get_courses();
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            foreach ($mycourses as $course) {
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                if (!$course->visible) {
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                    continue;
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                }
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                if (!in_array($course->category, $category_ids)) {
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                    array_push($category_ids, $course->category);
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                }
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            }
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        } else {
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            $mycourses  = enrol_get_users_courses($USER->id);
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            foreach ($mycourses as $course) {
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                if (!$course->visible) {
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                    continue;
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                }
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                if (!in_array($course->category, $category_ids)) {
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                    array_push($category_ids, $course->category);
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                }
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            }
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            $courses_with_autoenrol  = $DB->get_records('enrol', ['enrol' => 'self']);
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            foreach ($courses_with_autoenrol as $course_with_autoenrol) {
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                $course = get_course($course_with_autoenrol->courseid);
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                if (!$course->visible) {
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                    continue;
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                }
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                if (!in_array($course->category, $category_ids)) {
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                    array_push($category_ids, $course->category);
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                }
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            }
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        }
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        /*
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             public function get_records($table, array $conditions=null, $sort='', $fields='*', $limitfrom=0, $limitnum=0) {
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        list($select, $params) = $this->where_clause($table, $conditions);
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        return $this->get_records_select($table, $select, $params, $sort, $fields, $limitfrom, $limitnum);
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    }
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         */
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        $categories = [];
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        $recordsLevel0 = $DB->get_records('course_categories', ['visible' => 1, 'parent' => 0], 'sortorder, name');
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        foreach ($recordsLevel0 as $recordLevel0) {
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            $categoryLevel0 = [
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                'id' => $recordLevel0->id,
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                'name' => $recordLevel0->name,
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                'coursecount' => $recordLevel0->coursecount,
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                'childsLevel0' => [],
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            ];
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            $recordsLevel1 = $DB->get_records('course_categories', ['visible' => 1, 'parent' => $recordLevel0->id], 'sortorder, name');
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            foreach ($recordsLevel1 as $recordLevel1) {
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                $categoryLevel1 = [
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                    'id' => $recordLevel1->id,
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                    'name' => $recordLevel1->name,
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                    'coursecount' => $recordLevel1->coursecount,
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                    'childsLevel1' => [],
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                ];
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                $recordsLevel2 = $DB->get_records('course_categories', ['visible' => 1, 'parent' => $recordLevel1->id], 'sortorder, name');
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                foreach ($recordsLevel2 as $recordLevel2) {
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                    $categoryLevel2 = [
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                        'id' => $recordLevel2->id,
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                        'name' => $recordLevel2->name,
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                        'coursecount' => $recordLevel2->coursecount,
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                        'childsLevel2' => [],
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                    ];
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                    $recordsLevel3 = $DB->get_records('course_categories', ['visible' => 2, 'parent' => $recordLevel2->id], 'sortorder, name');
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                    foreach ($recordsLevel3 as $recordLevel3) {
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                        $categoryLevel3 = [
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                            'id' => $recordLevel3->id,
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                            'name' => $recordLevel3->name,
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                        ];
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                        array_push($categoryLevel2['childsLevel2'], $categoryLevel3);
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                    }
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                    if (count($categoryLevel1['childsLevel2']) > 0 || $categoryLevel2['coursecount'] > 0) {
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                        array_push($categoryLevel1['childsLevel1'], $categoryLevel2);
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                    }
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                }
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                if (count($categoryLevel1['childsLevel1']) > 0 || $categoryLevel1['coursecount'] > 0) {
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                    array_push($categoryLevel0['childsLevel0'], $categoryLevel1);
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                }
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            }
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            if (count($categoryLevel0['childsLevel0']) > 0 || $categoryLevel0['coursecount'] > 0) {
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                array_push($categories, $categoryLevel0);
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            }
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        }
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1 efrain 126 
        $data = [
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            'categories' => $categories
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        ];
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1 efrain 130 
        return $this->render_from_template('block_cursos_catalogo_ajax/form', $data);
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    }
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}