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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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namespace tool_brickfield\local\areas\mod_lesson;
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use tool_brickfield\area_base;
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/**
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 * Lesson page base.
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 *
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 * @package    tool_brickfield
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 * @copyright  2020 onward: Brickfield Education Labs, www.brickfield.ie
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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abstract class page_base extends area_base {
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    /**
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     * Get table name reference.
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     * @return string
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     */
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    public function get_ref_tablename(): string {
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        return 'lesson';
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    }
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    /**
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     * Find recordset of the relevant areas.
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     * @param \core\event\base $event
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     * @return \moodle_recordset|null
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     * @throws \coding_exception
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     * @throws \dml_exception
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     */
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    public function find_relevant_areas(\core\event\base $event): ?\moodle_recordset {
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        if ($event->eventname == '\mod_lesson\event\page_created' || $event->eventname == '\mod_lesson\event\page_updated') {
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            if ($event->component === 'mod_lesson') {
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                return $this->find_areas(['itemid' => $event->objectid]);
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            }
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        }
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        return null;
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    }
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    /**
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     * Find recordset of the course areas.
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     * @param int $courseid
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     * @return \moodle_recordset
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     * @throws \coding_exception
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     * @throws \dml_exception
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     */
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    public function find_course_areas(int $courseid): ?\moodle_recordset {
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        return $this->find_areas(['courseid' => $courseid]);
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    }
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    /**
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     * Find recordset of areas.
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     * @param array $params
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     * @return \moodle_recordset
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     * @throws \coding_exception
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     * @throws \dml_exception
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     */
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    protected function find_areas(array $params = []): \moodle_recordset {
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        global $DB;
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        $where = [];
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        if (!empty($params['itemid'])) {
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            $where[] = 'co.id = :itemid';
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        }
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        if (!empty($params['courseid'])) {
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            $where[] = 'cm.course = :courseid';
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        }
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        // Filter against approved / non-approved course category listings.
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        $this->filterfieldname = 'cm.course';
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        $this->get_courseid_filtering();
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        if ($this->filter != '') {
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            $params = $params + $this->filterparams;
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        }
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        $rs = $DB->get_recordset_sql('SELECT
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          ' . $this->get_type() . ' AS type,
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          ctx.id AS contextid,
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          ' . $this->get_standard_area_fields_sql() . '
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          co.id AS itemid,
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          ' . $this->get_reftable_field_sql() . '
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          t.id AS refid,
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          cm.id AS cmid,
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          cm.course AS courseid,
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          co.'.$this->get_fieldname().' AS content
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        FROM {lesson} t
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        JOIN {course_modules} cm ON cm.instance = t.id
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        JOIN {modules} m ON m.id = cm.module AND m.name = :preftablename2
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        JOIN {context} ctx ON ctx.instanceid = cm.id AND ctx.contextlevel = :pctxlevelmodule
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        JOIN {'.$this->get_tablename().'} co ON co.lessonid = t.id ' .
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        (!empty($where) ? 'WHERE ' . join(' AND ', $where) : '') . $this->filter . '
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        ORDER BY t.id, co.id',
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            ['pctxlevelmodule' => CONTEXT_MODULE,
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                'preftablename2' => $this->get_ref_tablename(),
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            ] + $params);
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        return $rs;
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    }
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}