<?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/>.

namespace core_courseformat;

use cm_info;
use core\context\module as module_context;
use core_completion\cm_completion_details;
use core_courseformat\local\overview\overviewitem;
use core_courseformat\output\local\overview\activityname;
use core_courseformat\base as courseformat;

/**
 * Base class for activity overview.
 *
 * Plugins must extend this class on their \mod_PLUGINNAME\courseformat\overview
 * integration to provide overview items about a course module instance.
 *
 * @package    core_courseformat
 * @copyright  2025 Ferran Recio <ferran@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
abstract class activityoverviewbase {
    /** @var cm_info The course module. */
    protected module_context $context;

    /** @var \stdClass $course */
    protected \stdClass $course;

    /** @var courseformat $format the course format */
    protected courseformat $format;

    /**
     * Activity Overview Base class constructor.
     *
     * Overview integrations are meant to use dependency injection.
     * Don't create instances of this class directly, use the factory instead.
     *
     * \core_courseformat\local\overview\overviewfactory::create($cm);
     *
     * Plugins can override the constructor adding more dependencies such as:
     *
     *  - protected readonly \moodle_database $db -> To access the database.
     *  - protected readonly \core\clock $clock -> The clock interface to handle time.
     *
     * However, it is important to note all original dependencies must be kept.
     *
     * @param cm_info $cm The course module information (loaded by the factory).
     */
    public function __construct(
        /** @var cm_info The course module. */
        protected readonly cm_info $cm,
    ) {
        $this->context = $cm->context;
        $this->course = $cm->get_course();
        $this->format = courseformat::instance($this->course);
    }

    /**
     * Get the plugin specific overview items for the activity.
     *
     * Plugins can override this method to provide their own overview items.
     *
     * The resulting array must be indexed by item shortname.
     *
     * @return overviewitem[] Array of overview items indexed by item shortname.
     */
    public function get_extra_overview_items(): array {
        return [];
    }

    /**
     * Get the name of the activity.
     */
    final public function get_name_overview(): overviewitem {
        return new overviewitem(
            name: get_string('name'),
            value: $this->cm->name,
            content: new activityname($this->cm),
        );
    }

    /**
     * Retrieves the due date overview for the activity.
     *
     * @return overviewitem|null null if module does not have a due date.
     */
    public function get_due_date_overview(): ?overviewitem {
        return null;
    }

    /**
     * Retrieves the actions overview for the activity.
     *
     * @return overviewitem|null null if module does not have a main action item.
     */
    public function get_actions_overview(): ?overviewitem {
        return null;
    }

    /**
     * Retrieves the completion overview for the activity.
     *
     * @return overviewitem|null null if completion is not enabled.
     */
    public function get_completion_overview(): ?overviewitem {
        global $USER;

        $showcompletionconditions = $this->course->showcompletionconditions == COMPLETION_SHOW_CONDITIONS;

        $completiondetails = cm_completion_details::get_instance(
            $this->cm,
            $USER->id,
            $showcompletionconditions
        );

        if (!$completiondetails->is_tracked_user()) {
            return null;
        }

        $showcompletioninfo = $completiondetails->has_completion() &&
            ($showcompletionconditions || $completiondetails->show_manual_completion());

        if (!$showcompletioninfo) {
            return new overviewitem(
                name: get_string('completion_status', 'completion'),
                value: null,
                content: '-',
            );
        }

        $status = $completiondetails->get_overall_completion();

        $completionclass = $this->format->get_output_classname('content\\cm\\completion');
        /** @var \core_courseformat\output\local\content\cm\completion $completion */
        $completion = new $completionclass(
            $this->format,
            $this->cm->get_section_info(),
            $this->cm
        );
        $completion->set_smallbutton(false);

        return new overviewitem(
            name: get_string('completion_status', 'completion'),
            value: $status,
            content: $completion,
        );
    }
}