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

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $email = $_POST['email'] ?? '';
    $password = $_POST['password'] ?? '';

    if (empty($email) || empty($password)) {
        $_SESSION['login_error'] = 'Email dan password harus diisi.';
        header('Location: login.php');
        exit();
    }

    try {
        $pdo = db();
        $stmt = $pdo->prepare("SELECT * FROM users WHERE email = ?");
        $stmt->execute([$email]);
        $user = $stmt->fetch();

        if ($user && password_verify($password, $user['password'])) {
            // Regenerate session ID to prevent session fixation
            session_regenerate_id(true);

            $_SESSION['user_id'] = $user['id'];
            $_SESSION['user_name'] = $user['nama_lengkap'];
            $_SESSION['user_role'] = $user['role'];
            $_SESSION['user_office_id'] = $user['id_kantor'];

            header('Location: index.php');
            exit();
        } else {
            $_SESSION['login_error'] = 'Email atau password salah.';
            header('Location: login.php');
            exit();
        }
    } catch (PDOException $e) {
        // In a real app, you would log this error
        $_SESSION['login_error'] = 'Terjadi kesalahan pada database.';
        header('Location: login.php');
        exit();
    }
} else {
    header('Location: login.php');
    exit();
}