<?php

// Enable error reporting for debugging
require_once dirname(__DIR__) . '/helpers/ErrorHandler.php';
ErrorHandler::init();

// Apply rate limiting
require_once dirname(__DIR__) . '/middleware/RateLimitMiddleware.php';
RateLimitMiddleware::apply('api');

// Start output buffering to capture any errors
ob_start();

try {
    // Load config
    $configPath = dirname(__DIR__) . '/config/config.php';
    require_once $configPath;
    require_once dirname(__DIR__) . '/helpers/Database.php';

    // Load models directly with absolute paths
    $ticketModelPath = dirname(__DIR__) . '/models/TicketModel.php';
    $commentModelPath = dirname(__DIR__) . '/models/CommentModel.php';
    $auditLogModelPath = dirname(__DIR__) . '/models/AuditLogModel.php';
    $workflowModelPath = dirname(__DIR__) . '/models/WorkflowModel.php';

    require_once $ticketModelPath;
    require_once $commentModelPath;
    require_once $auditLogModelPath;
    require_once $workflowModelPath;
    require_once dirname(__DIR__) . '/helpers/NotificationHelper.php';

    // Check authentication via session
    if (session_status() === PHP_SESSION_NONE) {
        session_start();
    }
    if (!isset($_SESSION['user']) || !isset($_SESSION['user']['user_id'])) {
        ob_end_clean();
        http_response_code(401);
        header('Content-Type: application/json');
        echo json_encode(['success' => false, 'error' => 'Authentication required']);
        exit;
    }

    // CSRF Protection
    require_once dirname(__DIR__) . '/middleware/CsrfMiddleware.php';
    if ($_SERVER['REQUEST_METHOD'] === 'POST' || $_SERVER['REQUEST_METHOD'] === 'PUT') {
        $csrfToken = $_SERVER['HTTP_X_CSRF_TOKEN'] ?? '';
        if (!CsrfMiddleware::validateToken($csrfToken)) {
            http_response_code(403);
            header('Content-Type: application/json');
            echo json_encode([
                'success' => false,
                'error' => 'Invalid CSRF token',
                'csrf_token' => CsrfMiddleware::getToken()
            ]);
            exit;
        }
        $GLOBALS['newCsrfToken'] = CsrfMiddleware::rotateToken();
    }

    $currentUser = $_SESSION['user'];
    $userId = $currentUser['user_id'];
    $isAdmin = $currentUser['is_admin'] ?? false;

    require_once dirname(__DIR__) . '/controllers/ApiTicketController.php';

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

    // Check request method
    if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
        throw new Exception("Method not allowed. Expected POST, got " . $_SERVER['REQUEST_METHOD']);
    }

    // Get POST data
    $input = file_get_contents('php://input');
    $data = json_decode($input, true);

    if (!$data) {
        ob_end_clean();
        http_response_code(400);
        header('Content-Type: application/json');
        echo json_encode(['success' => false, 'error' => 'Invalid JSON data received']);
        exit;
    }

    if (!isset($data['ticket_id'])) {
        ob_end_clean();
        http_response_code(400);
        header('Content-Type: application/json');
        echo json_encode(['success' => false, 'error' => 'Missing ticket_id parameter']);
        exit;
    }

    $ticketId = trim((string)$data['ticket_id']);

    // Initialize controller
    $controller = new ApiTicketController($conn, $userId, $isAdmin, $currentUser);

    // Update ticket
    $result = $controller->update($ticketId, $data);

    // Discard any output that might have been generated
    ob_end_clean();

    // Invalidate stats cache on successful ticket update
    if (!empty($result['success'])) {
        require_once dirname(__DIR__) . '/models/StatsModel.php';
        (new StatsModel($conn))->invalidateCache();
    }

    // Return response
    if (!empty($result['http_status'])) {
        http_response_code($result['http_status']);
        unset($result['http_status']);
    }
    header('Content-Type: application/json');
    echo json_encode($result);
} catch (Exception $e) {
    // Discard any output that might have been generated
    ob_end_clean();

    // Log error details but don't expose to client
    error_log("Update ticket API error: " . $e->getMessage());

    // Return error response
    header('Content-Type: application/json');
    http_response_code(500);
    echo json_encode([
        'success' => false,
        'error' => 'An internal error occurred'
    ]);
}