<?php
require_once '../db/config.php';

header('Content-Type: application/json');

$id = $_GET['id'] ?? null;

try {
    $pdo = db();

    if ($id) {
        $stmt = $pdo->prepare("SELECT * FROM customers WHERE id = ?");
        $stmt->execute([$id]);
        $customer = $stmt->fetch(PDO::FETCH_ASSOC);

        if ($customer) {
            echo json_encode($customer);
        } else {
            http_response_code(404);
            echo json_code(['error' => 'Customer not found']);
        }
    } else {
        $stmt = $pdo->query("SELECT * FROM customers");
        $customers = $stmt->fetchAll(PDO::FETCH_ASSOC);
        echo json_encode($customers);
    }

} catch (PDOException $e) {
    http_response_code(500);
    echo json_encode(['error' => 'Database error: ' . $e->getMessage()]);
}