<?php

declare(strict_types=1);

namespace ACA\WC\Search\UserSubscription;

use ACP;
use ACP\Query\Bindings;
use ACP\Search\Operators;
use ACP\Search\Value;

class ActiveSubscriber extends ACP\Search\Comparison
{

    public function __construct()
    {
        $operators = new Operators([
            Operators::IS_EMPTY,
            Operators::NOT_IS_EMPTY,
        ]);
        parent::__construct($operators);
    }

    protected function create_query_bindings(string $operator, Value $value): Bindings
    {
        global $wpdb;
        $ids = implode(',', $this->get_active_subscribers_ids());

        if (Operators::NOT_IS_EMPTY === $operator) {
            $where = $wpdb->users . '.ID IN( ' . $ids . ' )';
        } else {
            $where = $wpdb->users . '.ID NOT IN( ' . $ids . ' )';
        }

        $bindings = new Bindings();
        $bindings->where($where);

        return $bindings;
    }

    private function get_active_subscribers_ids()
    {
        global $wpdb;

        return $wpdb->get_col(
            "
        SELECT DISTINCT pm.meta_value
        FROM {$wpdb->prefix}posts as p
        JOIN {$wpdb->prefix}postmeta as pm ON p.ID = pm.post_id
        WHERE p.post_type = 'shop_subscription'
        AND p.post_status = 'wc-active'
        AND pm.meta_key = '_customer_user'
    "
        );
    }

}