frontend submit with wcs quota

/**
 * Simple Subscription article limits, keyed by product slug.
 */
function jnews_frontend_subscription_quota_payment( $subscription ) {
    $limits = array(
        '4-article-subs' => 4,
        '8-article'      => 8,
        '16-product'     => 16,
    );
    $limit  = 0;
    foreach ( $subscription->get_items() as $item ) {
        $product = $item->get_product();
        if ( ! $product || ! $product->is_type( 'subscription' ) ) {
            continue;
        }
        $key = $product->get_slug();
        if ( ! isset( $limits[ $key ] ) ) {
            $key = sanitize_title( $product->get_name() );
        }
        if ( isset( $limits[ $key ] ) ) {
            $limit += $limits[ $key ];
        }
    }
    $order = null;
    if ( $limit ) {
        foreach ( $subscription->get_related_orders( 'all', array( 'parent', 'renewal' ) ) as $related_order ) {
            if ( $related_order->is_paid() && $related_order->get_date_paid()
                && ( ! $order || $related_order->get_id() > $order->get_id() ) ) {
                $order = $related_order;
            }
        }
    }
    return array(
        'limit' => $limit,
        'order' => $order,
    );
}

function jnews_frontend_subscription_is_valid( $subscription ) {
    $end = $subscription->get_time( 'end' );
    return $subscription->has_status( array( 'active', 'pending-cancel' ) ) && ( ! $end || $end > time() );
}

/**
 * Replace listing_left once per paid order. Status changes alone never refill it.
 */
function jnews_frontend_subscription_sync_quota( $subscription ) {
    if ( ! get_theme_mod( 'jnews_frontend_submit_enable_woocommerce', false ) || ! jnews_frontend_subscription_is_valid( $subscription ) ) {
        return;
    }
    $payment = jnews_frontend_subscription_quota_payment( $subscription );
    $user_id = $subscription->get_user_id();
    if ( ! $user_id || ! $payment['order'] ) {
        return;
    }
    $order_id  = $payment['order']->get_id();
    $processed = (int) $subscription->get_meta( '_jnews_quota_processed_order_id', true );
    $latest    = (int) get_user_meta( $user_id, '_jnews_quota_latest_order_id', true );
    if ( $processed >= $order_id || $latest >= $order_id ) {
        return;
    }
    // Preserve articles charged by the previous implementation during migration.
    $used      = array_filter( (array) $subscription->get_meta( '_jnews_article_usage_' . $order_id, true ) );
    $remaining = max( 0, $payment['limit'] - count( $used ) );
    update_user_meta( $user_id, 'listing_left', $remaining );
    update_user_meta( $user_id, '_jnews_quota_latest_order_id', $order_id );
    $subscription->update_meta_data( '_jnews_quota_processed_order_id', $order_id );
    $subscription->save_meta_data();
}

/**
 * Block inactive subscribers; active subscribers use JNews's quota check.
 */
function jnews_frontend_submit_simple_subscription_access( $allowed ) {
    if ( ! get_theme_mod( 'jnews_frontend_submit_enable_woocommerce', false ) || ! is_user_logged_in() || ! function_exists( 'wcs_get_users_subscriptions' ) ) {
        return $allowed;
    }
    $managed = false;
    foreach ( wcs_get_users_subscriptions( get_current_user_id() ) as $subscription ) {
        $payment = jnews_frontend_subscription_quota_payment( $subscription );
        if ( ! $payment['limit'] ) {
            continue;
        }
        $managed = true;
        if ( jnews_frontend_subscription_is_valid( $subscription ) ) {
            return $allowed;
        }
    }
    return $managed ? false : $allowed;
}

/**
 * Remove the article balance when a configured subscription is cancelled or expired.
 */
function jnews_frontend_subscription_clear_quota( $subscription ) {
    $user_id = $subscription->get_user_id();
    $payment = jnews_frontend_subscription_quota_payment( $subscription );
    if ( $user_id && $payment['limit'] ) {
        delete_user_meta( $user_id, 'listing_left' );
    }
}

add_filter( 'jnews_frontend_submit_user_subscription', 'jnews_frontend_submit_simple_subscription_access' );
add_action( 'woocommerce_subscription_payment_complete', 'jnews_frontend_subscription_sync_quota' );
add_action( 'woocommerce_subscription_status_updated', 'jnews_frontend_subscription_sync_quota' );
add_action( 'woocommerce_subscription_status_cancelled', 'jnews_frontend_subscription_clear_quota' );
add_action( 'woocommerce_subscription_status_expired', 'jnews_frontend_subscription_clear_quota' );