<?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/>.

/**
 * Contains the default content output class.
 *
 * @package   format_onetopic
 * @copyright 2022 David Herney Bernal - cirano. https://bambuco.co
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace format_onetopic\output\courseformat;

use core_courseformat\output\local\content as content_base;
use core\output\named_templatable;
use core_courseformat\base as course_format;
use course_modinfo;
use renderable;

/**
 * Base class to render a course content.
 *
 * @package   format_onetopic
 * @copyright 2022 David Herney Bernal - cirano. https://bambuco.co
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class content extends content_base {

    /**
     * @var bool Topic format has add section after each topic.
     *
     * The responsible for the buttons is core_courseformat\output\local\content\section.
     */
    protected $hasaddsection = false;

    /**
     * Returns the output class template path.
     *
     * This method redirects the default template when the course content is rendered.
     *
     * @param renderer_base $renderer typically, the renderer that's calling this function
     * @return string format template name
     */
    public function get_template_name(\renderer_base $renderer): string {
        return 'format_onetopic/local/content';
    }

    /**
     * Export this data so it can be used as the context for a mustache template (core/inplace_editable).
     *
     * @param \renderer_base $output typically, the renderer that's calling this function
     * @return stdClass data context for a mustache template
     */
    public function export_for_template(\renderer_base $output) {
        global $PAGE;
        $format = $this->format;
        $course = $format->get_course();
        $currentsection = $this->format->get_section_number();

        // If format use the section 0 as a separate section so remove from the list.
        $sections = $this->export_sections($output);

        $data = (object)[
            'title' => $format->page_title(), // This method should be in the course_format class.
            'sections' => $sections,
            'format' => $format->get_format(),
            'sectionclasses' => ''
        ];

        // The current section format has extra navigation.
        if ($currentsection || $currentsection === 0) {

            $usessectionsnavigation = isset($course->usessectionsnavigation) ? $course->usessectionsnavigation : null;
            if (empty($usessectionsnavigation)) {
                $usessectionsnavigation = get_config('format_onetopic', 'defaultsectionsnavigation');
            }

            if ($usessectionsnavigation != \format_onetopic::SECTIONSNAVIGATION_NOT) {
                if ($usessectionsnavigation != \format_onetopic::SECTIONSNAVIGATION_SUPPORT ||
                        !$PAGE->theme->usescourseindex) {

                    $sectionnavigation = new $this->sectionnavigationclass($format, $currentsection);

                    // Not show navigation in top section if is not both.
                    if ($usessectionsnavigation == \format_onetopic::SECTIONSNAVIGATION_BOTH) {
                        $data->sectionnavigation = $sectionnavigation->export_for_template($output);
                    }

                    $sectionselector = new $this->sectionselectorclass($format, $sectionnavigation);
                    $data->sectionselector = $sectionselector->export_for_template($output);

                    if ($usessectionsnavigation == \format_onetopic::SECTIONSNAVIGATION_SLIDES) {
                        $data->sectionclasses .= ' sectionsnavigation-slides';
                    }
                }
            }

        }

        $data->singlesection = array_shift($data->sections);

        if ($this->hasaddsection) {
            $addsection = new $this->addsectionclass($format);
            $data->numsections = $addsection->export_for_template($output);
        }

        return $data;
    }

    /**
     * Export sections array data.
     *
     * @param \renderer_base $output typically, the renderer that's calling this function
     * @return array data context for a mustache template
     */
    protected function export_sections(\renderer_base $output): array {

        $format = $this->format;
        $course = $format->get_course();
        $modinfo = $this->format->get_modinfo();

        $realcoursedisplay = property_exists($course, 'realcoursedisplay') ? $course->realcoursedisplay : false;
        $firstsectionastab = ($realcoursedisplay == COURSE_DISPLAY_MULTIPAGE) ? 1 : 0;

        // Generate section list.
        $sections = [];
        $stealthsections = [];
        $numsections = $format->get_last_section_number();

        foreach ($this->get_sections_to_display($modinfo) as $thissection) {

            // The course/view.php check the section existence but the output can be called
            // from other parts so we need to check it.
            if (!$thissection) {
                throw new \moodle_exception('unknowncoursesection', 'error', course_get_url($course), s($course->fullname));
            }

            $section = new $this->sectionclass($format, $thissection);
            $sectionnum = $section->get_section_number();

            if ($sectionnum === 0 && $firstsectionastab) {
                continue;
            }

            if ($sectionnum > $numsections) {
                // Activities inside this section are 'orphaned', this section will be printed as 'stealth' below.
                if (!empty($modinfo->sections[$sectionnum])) {
                    $stealthsections[] = $section->export_for_template($output);
                }
                continue;
            }

            if (!$format->is_section_visible($thissection)) {
                continue;
            }

            $sections[] = $section->export_for_template($output);
        }

        if (!empty($stealthsections)) {
            $sections = array_merge($sections, $stealthsections);
        }

        return $sections;
    }

    /**
     * Return an array of sections to display.
     *
     * This method is used to differentiate between display a specific section
     * or a list of them.
     *
     * @param course_modinfo $modinfo the current course modinfo object
     * @return section_info[] an array of section_info to display
     */
    private function get_sections_to_display(course_modinfo $modinfo): array {
        $sections = [];
        $singlesection = $this->format->get_section_number();
        $sections[] = $modinfo->get_section_info($singlesection);

        return $sections;
    }

}
