<?php
error_reporting(E_ERROR | E_PARSE);
include('includes/config/config.php');
include('includes/functions.php');

if (!empty($_POST['item_id'])) {

    $item_id = $_POST['item_id'];

    $sql_med = "select group_concat(salt_id) as ids from tbl_items a left join item_salt b on a.item_id = b.item_id where a.item_id = '" . $item_id . "' ";

    error_log("query " . $sql_med);

    if (!$result_med = @mysqli_query($conn, $sql_med)) {
        error_log("error in getting medicine " . mysqli_error($conn));
        die(mysqli_error($conn));
    }

    $row_med = mysqli_fetch_assoc($result_med);

    $salt_id_arr = explode(",", $row_med['ids']);

    error_log("salt ids " . $salt_id_arr);

    $item_ids = [];

    $query = "select item_id from item_salt where salt_id in (" . implode(",", $salt_id_arr) . ") group by item_id having count(distinct salt_id) = " . count($salt_id_arr) . " and item_id != '" . $item_id . "'";

    error_log("query for alternate salt med " . $query);

    if (!$result_salt = mysqli_query($conn, $query)) {
        error_log("error " . mysqli_error($conn));
    } else {
        while ($row_salt = mysqli_fetch_assoc($result_salt)) {

            $stock = "select sum(stock_qty) as qty from item_stock where item_id = '" . $row_salt['item_id'] . "' 
            and stock_qty > 0 and ohc_type_id = '" . $_SESSION['current_ohcttype'] . "' and expiry_date > curdate()";


            error_log("query for stock qty med " . $stock);

            if (!$result_stock = mysqli_query($conn, $stock)) {
                error_log("error in stock " . $stock);
            } else {

                $row_stock = mysqli_fetch_assoc($result_stock);

                $item_id  = $row_salt['item_id'];
                $item_name = getFieldFromTable('item_name', 'tbl_items', 'item_id', $item_id);
                $is_prescribed = getFieldFromTable('is_prescription', 'tbl_items', 'item_id', $item_id);

                if ($row_stock['qty'] == null) {
                    $item_ids[] = array(
                        'item_name' => $item_name,
                        'item_id' => $item_id,
                        'is_prescribed' => $is_prescribed,
                        'qty' => 0
                    );
                } else {
                    $item_ids[] = array(
                        'item_name' => $item_name,
                        'item_id' => $item_id,
                        'is_prescribed' => $is_prescribed,
                        'qty' => $row_stock['qty']
                    );
                }
            }
        }
    }

    error_log("data " . print_r($item_ids, true));
}

echo json_encode($item_ids);