<?php
// Disable error display in the output
ini_set('display_errors', 0);
error_reporting(E_ALL);

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

try {
    // Include required files with proper error handling
    $configPath = dirname(__DIR__) . '/config/config.php';
    $commentModelPath = dirname(__DIR__) . '/models/CommentModel.php';
    $auditLogModelPath = dirname(__DIR__) . '/models/AuditLogModel.php';

    if (!file_exists($configPath)) {
        throw new Exception("Config file not found: $configPath");
    }

    if (!file_exists($commentModelPath)) {
        throw new Exception("CommentModel file not found: $commentModelPath");
    }

    require_once $configPath;
    require_once $commentModelPath;
    require_once $auditLogModelPath;

    // Check authentication via session
    session_start();
    if (!isset($_SESSION['user']) || !isset($_SESSION['user']['user_id'])) {
        throw new Exception("Authentication required");
    }

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

    // Create database connection
    $conn = new mysqli(
        $GLOBALS['config']['DB_HOST'],
        $GLOBALS['config']['DB_USER'],
        $GLOBALS['config']['DB_PASS'],
        $GLOBALS['config']['DB_NAME']
    );

    if ($conn->connect_error) {
        throw new Exception("Database connection failed: " . $conn->connect_error);
    }

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

    if (!$data) {
        throw new Exception("Invalid JSON data received");
    }

    $ticketId = $data['ticket_id'];

    // Initialize models
    $commentModel = new CommentModel($conn);
    $auditLog = new AuditLogModel($conn);

    // Add comment with user tracking
    $result = $commentModel->addComment($ticketId, $data, $userId);

    // Log comment creation to audit log
    if ($result['success'] && isset($result['comment_id'])) {
        $auditLog->logCommentCreate($userId, $result['comment_id'], $ticketId);
    }

    // Discard any unexpected output
    ob_end_clean();

    // Return JSON response
    header('Content-Type: application/json');
    echo json_encode($result);
    
} catch (Exception $e) {
    // Discard any unexpected output
    ob_end_clean();
    
    // Return error response
    header('Content-Type: application/json');
    echo json_encode([
        'success' => false,
        'error' => $e->getMessage()
    ]);
}