<?php
/**
 * Profile API — any logged-in user can view/update their own profile
 * GET    ?action=get       — Get current user's profile
 * POST   ?action=update    — Update current user's profile (except personnel_code)
 */

require_once __DIR__ . '/../config/database.php';
require_once __DIR__ . '/../config/auth.php';

header('Content-Type: application/json; charset=utf-8');

requireLogin();

$action = $_GET['action'] ?? '';

switch ($action) {
    case 'get':
        getProfile();
        break;
    case 'update':
        updateProfile();
        break;
    default:
        jsonResponse(['error' => 'Invalid action'], 400);
}

function getProfile() {
    $userId = $_SESSION['user_id'];
    $db = getDB();
    $stmt = $db->prepare("SELECT id, username, role, full_name, personnel_code, subject_area, branch_code, email, created_at FROM users WHERE id = ?");
    $stmt->execute([$userId]);
    $user = $stmt->fetch();

    if (!$user) {
        jsonResponse(['error' => 'ไม่พบข้อมูลผู้ใช้'], 404);
    }
    jsonResponse(['user' => $user]);
}

function updateProfile() {
    $userId = $_SESSION['user_id'];
    $input = getInput();

    $fullName = trim($input['full_name'] ?? '');
    $subjectArea = trim($input['subject_area'] ?? '');
    $branchCode = trim($input['branch_code'] ?? '');
    $email = trim($input['email'] ?? '');

    $db = getDB();

    $fields = [];
    $params = [];

    if (!empty($fullName)) { $fields[] = "full_name = ?"; $params[] = $fullName; }
    if ($subjectArea !== '') { $fields[] = "subject_area = ?"; $params[] = $subjectArea; }
    if ($branchCode !== '') { $fields[] = "branch_code = ?"; $params[] = $branchCode; }
    if (isset($input['email'])) { $fields[] = "email = ?"; $params[] = trim($input['email']); }

    // Update password if provided
    if (!empty($input['password'])) {
        if (strlen($input['password']) < 4) {
            jsonResponse(['error' => 'รหัสผ่านต้องมีอย่างน้อย 4 ตัวอักษร'], 400);
        }
        $fields[] = "password_hash = ?";
        $params[] = password_hash($input['password'], PASSWORD_DEFAULT);
    }

    if (empty($fields)) {
        jsonResponse(['error' => 'ไม่มีข้อมูลที่ต้องอัปเดต'], 400);
    }

    $params[] = $userId;
    $sql = "UPDATE users SET " . implode(', ', $fields) . " WHERE id = ?";
    $stmt = $db->prepare($sql);
    $stmt->execute($params);

    // Update session name if changed
    if (!empty($fullName)) {
        $_SESSION['full_name'] = $fullName;
    }

    jsonResponse(['success' => true, 'message' => 'อัปเดตข้อมูลส่วนตัวสำเร็จ']);
}