<?php
/**
 * Auto-grant medals from catalog thresholds (zibll zib_auto_add_user_medal lite).
 *
 * @package AKSRT
 */

namespace AKSRT\User;

defined('ABSPATH') || exit;

class BadgeAutoAward {

	private static $instance = null;

	public static function get_instance(): self {
		if (null === self::$instance) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	public function init(): void {
		// Run after login / current user bootstrap.
		add_action('wp_login', [$this, 'on_login'], 20, 2);
		add_action('wp', [$this, 'maybe_for_current_user'], 30);
		// Cheap hooks for common counters.
		add_action('publish_post', [$this, 'on_content_change'], 20, 1);
		add_action('comment_post', [$this, 'on_content_change'], 20, 1);
		add_action('aksrt_user_followed', [$this, 'on_follow'], 20, 2);
		add_action('aksrt_checkin_done', [$this, 'on_checkin'], 20, 1);
	}

	public function on_login($user_login, $user): void {
		if ($user instanceof \WP_User) {
			$this->evaluate((int) $user->ID);
		}
	}

	public function maybe_for_current_user(): void {
		if (!is_user_logged_in() || is_admin()) {
			return;
		}
		// Throttle: once per 10 minutes per user.
		$uid = get_current_user_id();
		$key = 'aksrt_badge_auto_' . $uid;
		if (get_transient($key)) {
			return;
		}
		set_transient($key, 1, 10 * MINUTE_IN_SECONDS);
		$this->evaluate($uid);
	}

	public function on_content_change($arg = null): void {
		$uid = get_current_user_id();
		if ($uid > 0) {
			$this->evaluate($uid);
		}
	}

	public function on_follow(int $follower_id, int $following_id): void {
		if ($following_id > 0) {
			$this->evaluate($following_id);
		}
		if ($follower_id > 0) {
			$this->evaluate($follower_id);
		}
	}

	public function on_checkin(int $user_id): void {
		if ($user_id > 0) {
			$this->evaluate($user_id);
		}
	}

	public function evaluate(int $user_id): void {
		if ($user_id <= 0 || !class_exists('\AKSRT\User\Badges') || !Badges::enabled()) {
			return;
		}
		Badges::auto_evaluate($user_id);
	}
}