<?php

namespace ACA\WC\Search\ShopOrder;

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

class OrderWeight extends Comparison
{

    public function __construct()
    {
        $operators = new ACP\Search\Operators(
            [
                ACP\Search\Operators::LT,
                ACP\Search\Operators::GT,
                ACP\Search\Operators::BETWEEN,
            ]
        );

        parent::__construct($operators);
    }

    protected function create_query_bindings(string $operator, Value $value): Bindings
    {
        $bindings = new Bindings();

        return $bindings->where($this->get_where($operator, $value));
    }

    public function get_where($operator, $value)
    {
        global $wpdb;

        $order_ids = $this->get_order_ids($operator, $value);
        $order_ids = array_filter($order_ids, 'is_numeric');

        // Force empty results when not IDs are found
        if (empty($order_ids)) {
            $order_ids = [0];
        }

        return sprintf("{$wpdb->posts}.ID IN( %s )", implode(',', $order_ids));
    }

    public function get_order_ids($operator, Value $value)
    {
        global $wpdb;

        switch ($operator) {
            case ACP\Search\Operators::BETWEEN:
                $where = $wpdb->prepare('total BETWEEN %d AND %d', $value->get_value()[0], $value->get_value()[1]);
                break;
            default:
                $where = $wpdb->prepare("total {$operator} %d", $value->get_value());
        }

        // The sub query needs a limit in order to sort the subquery before grouping it, which is necessary in this case
        $sql = "
		SELECT ID, SUM(total) AS total
		FROM (
			SELECT woi.order_id AS ID, woim2.meta_value*pm.meta_value AS total
			FROM {$wpdb->prefix}woocommerce_order_items AS woi
			JOIN ( 
				SELECT order_item_id, meta_value AS product_id FROM (
					SELECT * FROM {$wpdb->prefix}woocommerce_order_itemmeta
					WHERE meta_key = '_product_id' OR meta_key = '_variation_id'
					ORDER BY meta_value DESC
					LIMIT 1000000000
				) AS sq
				GROUP BY order_item_id
			) AS woim ON woi.order_item_id = woim.order_item_id
			JOIN {$wpdb->prefix}woocommerce_order_itemmeta AS woim2 ON woi.order_item_id = woim2.order_item_id AND woim2.meta_key = '_qty'
			JOIN {$wpdb->postmeta} AS pm ON woim.product_id = pm.post_id AND pm.meta_key = '_weight'
			WHERE woi.order_item_type = 'line_item'
		) AS total_order_weight
		GROUP BY total_order_weight.ID
		HAVING {$where}
		";

        return $wpdb->get_col($sql);
    }

}