wcs frontend submit with qouta

/**
 * Frontend Submit quotas per paid Simple Subscription period.
 * Keys are product slugs; unused articles do not carry into a new paid period.
 */
function jnews_frontend_article_quota( $user_id ) {
    $result = array( 'managed' => false, 'remaining' => 0, 'claim' => null );
    if ( ! $user_id || ! function_exists( 'wcs_get_users_subscriptions' ) ) {
        return $result;
    }
    $limits = array( '4-article-subs' => 4, '8-article' => 8, '16-product' => 16 );
    foreach ( wcs_get_users_subscriptions( $user_id ) as $subscription ) {
        $limit = 0;
        foreach ( $subscription->get_items() as $item ) {
            $product = $item->get_product();
            if ( $product && $product->is_type( 'subscription' ) ) {
                $key = $product->get_slug();
                if ( ! isset( $limits[ $key ] ) ) {
                    $key = sanitize_title( $product->get_name() );
                }
                if ( isset( $limits[ $key ] ) ) {
                    $limit += $limits[ $key ];
                }
            }
        }
        if ( ! $limit ) {
            continue;
        }
        $result['managed'] = true;
        $end = $subscription->get_time( 'end' );
        if ( ! $subscription->has_status( array( 'active', 'pending-cancel' ) ) || ( $end && $end <= time() ) ) {
            continue;
        }

        // Only a paid parent/renewal order starts a quota period. An unpaid
        // renewal or reactivation of the same subscription cannot reset usage.
        $paid_order = null;
        $paid_time  = 0;
        foreach ( $subscription->get_related_orders( 'all', array( 'parent', 'renewal' ) ) as $order ) {
            $date = $order->get_date_paid();
            if ( $order->is_paid() && $date && $date->getTimestamp() >= $paid_time ) {
                $paid_order = $order;
                $paid_time  = $date->getTimestamp();
            }
        }
        if ( ! $paid_order ) {
            continue;
        }
        $key       = '_jnews_article_usage_' . $paid_order->get_id();
        $used      = (array) $subscription->get_meta( $key, true );
        $used      = array_filter( $used );
        $remaining = max( 0, $limit - count( $used ) );
        $result['remaining'] += $remaining;
        if ( $remaining && ! $result['claim'] ) {
            $result['claim'] = array( 'subscription' => $subscription, 'key' => $key, 'used' => $used );
        }
    }
    return $result;
}

function jnews_frontend_submit_simple_subscription_access( $allowed ) {
    if ( ! get_theme_mod( 'jnews_frontend_submit_enable_woocommerce', false ) || ! is_user_logged_in() ) {
        return $allowed;
    }
    $quota = jnews_frontend_article_quota( get_current_user_id() );
    return $quota['managed'] ? $quota['remaining'] > 0 : $allowed;
}
add_filter( 'jnews_frontend_submit_user_subscription', 'jnews_frontend_submit_simple_subscription_access' );

/**
 * Check before the plugin's wp_loaded handler without modifying that handler.
 * Serialize submissions by user so simultaneous requests cannot overspend.
 */
function jnews_frontend_article_quota_before_submit() {
    if ( ! get_theme_mod( 'jnews_frontend_submit_enable_woocommerce', false ) || ! is_user_logged_in()
        || ! isset( $_REQUEST['jnews-action'], $_REQUEST['jnews-editor-nonce'] )
        || 'create-post' !== $_REQUEST['jnews-action']
        || ! is_string( $_REQUEST['jnews-editor-nonce'] )
        || ! wp_verify_nonce( $_REQUEST['jnews-editor-nonce'], 'jnews-editor' ) ) {
        return;
    }
    $user_id = get_current_user_id();
    $quota   = jnews_frontend_article_quota( $user_id );
    if ( ! $quota['managed'] ) {
        return;
    }
    $lock = 'jnews_article_submit_lock_' . $user_id;
    $held = (int) get_option( $lock, 0 );
    if ( $held && $held < time() - 300 ) {
        delete_option( $lock );
    }
    if ( ! add_option( $lock, time(), '', false ) ) {
        wp_die( esc_html__( 'Another article is being submitted. Please try again shortly.', 'jnews' ), '', array( 'response' => 409 ) );
    }
    register_shutdown_function( function () use ( $lock ) { delete_option( $lock ); } );
    // Re-read after obtaining the lock in case another request just completed.
    $quota = jnews_frontend_article_quota( $user_id );
    if ( ! $quota['claim'] ) {
        wp_die( esc_html__( 'Your subscription has no article quota available. Please renew or activate your subscription.', 'jnews' ), '', array( 'response' => 403 ) );
    }
    $GLOBALS['jnews_frontend_article_claim'] = $quota['claim'];
}
add_action( 'wp_loaded', 'jnews_frontend_article_quota_before_submit', 19 );

/**
 * Charge only a successfully inserted new article; editing/deletion never refunds it.
 */
function jnews_frontend_article_quota_after_insert( $post_id, $post, $update ) {
    if ( $update || empty( $GLOBALS['jnews_frontend_article_claim'] ) || 'post' !== $post->post_type
        || (int) $post->post_author !== get_current_user_id() || in_array( $post->post_status, array( 'auto-draft', 'trash' ), true ) ) {
        return;
    }
    $claim = $GLOBALS['jnews_frontend_article_claim'];
    unset( $GLOBALS['jnews_frontend_article_claim'] );
    $claim['used'][] = $post_id;
    $claim['subscription']->update_meta_data( $claim['key'], array_unique( $claim['used'] ) );
    $claim['subscription']->save_meta_data();
    update_post_meta( $post_id, '_jnews_article_quota_subscription', $claim['subscription']->get_id() );
    // Subscription quota replaces the plugin's one-time Post Package deduction.
    update_post_meta( $post_id, 'finish_process', true );
}
add_action( 'wp_after_insert_post', 'jnews_frontend_article_quota_after_insert', 10, 3 );

function jnews_frontend_article_quota_remaining_text( $text ) {
    $quota = jnews_frontend_article_quota( get_current_user_id() );
    return $quota['managed'] ? (string) $quota['remaining'] : $text;
}
add_filter( 'jnews_frontend_submit_remaining_quota_text', 'jnews_frontend_article_quota_remaining_text' );