<?php
// includes/stock_helper.php

if (!function_exists('current_outlet_id')) {
    function current_outlet_id() {
        if (session_status() === PHP_SESSION_NONE && !headers_sent()) session_start();
        return (int)($_SESSION['outlet_id'] ?? 1);
    }
}

if (!function_exists('update_stock')) {
    function update_stock($item_id, $qty, $outlet_id = null) {
        // With local stock items, item_id is unique and holds the correct stock_quantity.
        // We can update it directly.
        // We ignore $outlet_id because item_id already implies the outlet (if we enforce separation).
        // However, for extra safety or validation, we could check.
        // But for now, simple update is best.
        
        $normalizedQty = function_exists('normalize_quantity') ? normalize_quantity($qty) : round((float)$qty, 2);

        $db = db();
        $stmt = $db->prepare("UPDATE stock_items SET stock_quantity = stock_quantity + ? WHERE id = ?");
        $stmt->execute([$normalizedQty, $item_id]);
    }
}