<?php
/**
 * User Preferences API Endpoint
 * Handles GET (fetch preferences) and POST (update preference)
 */

require_once dirname(__DIR__) . '/config/config.php';
require_once dirname(__DIR__) . '/helpers/Database.php';
require_once dirname(__DIR__) . '/models/UserPreferencesModel.php';

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

// Check authentication
if (!isset($_SESSION['user']) || !isset($_SESSION['user']['user_id'])) {
    http_response_code(401);
    echo json_encode(['success' => false, 'error' => 'Not authenticated']);
    exit;
}

// CSRF Protection
require_once dirname(__DIR__) . '/middleware/CsrfMiddleware.php';
if ($_SERVER['REQUEST_METHOD'] === 'POST' || $_SERVER['REQUEST_METHOD'] === 'DELETE') {
    $csrfToken = $_SERVER['HTTP_X_CSRF_TOKEN'] ?? '';
    if (!CsrfMiddleware::validateToken($csrfToken)) {
        http_response_code(403);
        echo json_encode(['success' => false, 'error' => 'Invalid CSRF token']);
        exit;
    }
}

$userId = $_SESSION['user']['user_id'];

// Use centralized database connection
$conn = Database::getConnection();

$prefsModel = new UserPreferencesModel($conn);

// GET - Fetch all preferences for user
if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    try {
        $prefs = $prefsModel->getUserPreferences($userId);
        echo json_encode(['success' => true, 'preferences' => $prefs]);
    } catch (Exception $e) {
        http_response_code(500);
        echo json_encode(['success' => false, 'error' => 'Failed to fetch preferences']);
    }
    exit;
}

// POST - Update a preference
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $data = json_decode(file_get_contents('php://input'), true);

    if (!isset($data['key']) || !isset($data['value'])) {
        http_response_code(400);
        echo json_encode(['success' => false, 'error' => 'Missing key or value']);
            exit;
    }

    $key = trim($data['key']);
    $value = $data['value'];

    // Validate preference key (whitelist)
    $validKeys = [
        'rows_per_page',
        'default_status_filters',
        'table_density',
        'notifications_enabled',
        'sound_effects',
        'toast_duration'
    ];

    if (!in_array($key, $validKeys)) {
        http_response_code(400);
        echo json_encode(['success' => false, 'error' => 'Invalid preference key']);
            exit;
    }

    try {
        $success = $prefsModel->setPreference($userId, $key, $value);

        // Also update cookie for rows_per_page for backwards compatibility
        if ($key === 'rows_per_page') {
            setcookie('ticketsPerPage', $value, time() + (86400 * 365), '/');
        }

        echo json_encode(['success' => $success]);
    } catch (Exception $e) {
        http_response_code(500);
        echo json_encode(['success' => false, 'error' => 'Failed to save preference']);
    }
    exit;
}

// DELETE - Delete a preference (optional endpoint)
if ($_SERVER['REQUEST_METHOD'] === 'DELETE') {
    $data = json_decode(file_get_contents('php://input'), true);

    if (!isset($data['key'])) {
        http_response_code(400);
        echo json_encode(['success' => false, 'error' => 'Missing key']);
            exit;
    }

    try {
        $success = $prefsModel->deletePreference($userId, $data['key']);
        echo json_encode(['success' => $success]);
    } catch (Exception $e) {
        http_response_code(500);
        echo json_encode(['success' => false, 'error' => 'Failed to delete preference']);
    }
    exit;
}

// Method not allowed
http_response_code(405);
echo json_encode(['success' => false, 'error' => 'Method not allowed']);
$conn->close();
?>