<?php
session_start();
require_once 'db/config.php';

if (!isset($_SESSION['user_id']) || $_SESSION['user_role'] !== 'client') {
    header('Location: login.php');
    exit;
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $client_id = $_SESSION['user_id'];
    $timezone = $_POST['timezone'] ?? 'UTC';

    $pdo = db();
    $stmt = $pdo->prepare("UPDATE clients SET timezone = ? WHERE id = ?");
    $stmt->execute([$timezone, $client_id]);

    header('Location: dashboard.php?status=settings_updated');
    exit;
} else {
    header('Location: dashboard.php');
    exit;
}