<?php
// File: actions/process_login.php
// สำคัญ: ต้องไม่มีช่องว่าง, ตัวอักษร, หรือ BOM ก่อน <?php นี้
session_start();

if (isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true) {
    header("location: ../dashboard.php");
    exit;
}

require_once '../includes/db_hosoffice.php';

if ($_SERVER["REQUEST_METHOD"] == "POST") {

    $user = trim($_POST['username'] ?? '');
    $pass = trim($_POST['password'] ?? '');

    if (empty($user) || empty($pass)) {
        $_SESSION['login_error'] = "กรุณากรอก Username และ Password";
        header("location: ../index.php");
        exit;
    }

    $pass_md5 = MD5($pass);

    $sql = "SELECT HR_CID, HR_PASSWORD, HR_STATUS_ID, HR_PREFIX_NAME, HR_FNAME, HR_LNAME 
            FROM hr_person a  
            LEFT OUTER JOIN hr_prefix e ON a.HR_PREFIX_ID=e.HR_PREFIX_ID 
            WHERE a.HR_USERNAME = :user LIMIT 1";

    try {
        $stmt = $pdo_hos->prepare($sql);
        $stmt->execute(['user' => $user]);
        $row = $stmt->fetch(PDO::FETCH_ASSOC);

        if (!$row) {
            $_SESSION['login_error'] = "ไม่พบบัญชีผู้ใช้นี้";
            header("location: ../index.php");
            exit;
        }

        if (strtolower($row['HR_PASSWORD']) !== strtolower($pass_md5)) {
            $_SESSION['login_error'] = "รหัสผ่านไม่ถูกต้อง";
            header("location: ../index.php");
            exit;
        }

        if ($row['HR_STATUS_ID'] !== '01') {
            $_SESSION['login_error'] = "บัญชีผู้ใช้นี้ถูกปิดการใช้งานไปแล้ว";
            header("location: ../index.php");
            exit;
        }

        unset($_SESSION['login_error']);

        $_SESSION['loggedin'] = true;
        $_SESSION['fullname'] = $row['HR_PREFIX_NAME'] . $row['HR_FNAME'] . " " . $row['HR_LNAME'];
        $_SESSION['cid'] = $row['HR_CID'];
        //$_SESSION['dep_id'] = $row['HR_DEPARTMENT_SUB_SUB_ID'];
        //$_SESSION['department'] = $row['HR_DEPARTMENT_SUB_SUB_NAME'];

        header("location: ../dashboard.php");
        exit;
    } catch (PDOException $e) {
        $_SESSION['login_error'] = "เกิดข้อผิดพลาดของระบบ: " . $e->getMessage();
        header("location: ../index.php");
        exit;
    }
} else {
    header("location: ../index.php");
    exit;
}
// สำคัญ: ต้องไม่มีช่องว่าง หรือบรรทัดว่างหลังโค้ด PHP นี้