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

session_start();
require_once dirname(__DIR__) . '/config/config.php';
require_once dirname(__DIR__) . '/helpers/Database.php';
require_once dirname(__DIR__) . '/models/BulkOperationsModel.php';
require_once dirname(__DIR__) . '/models/TicketModel.php';
require_once dirname(__DIR__) . '/models/AuditLogModel.php';

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

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

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

// Check admin status - bulk operations are admin-only
$isAdmin = $_SESSION['user']['is_admin'] ?? false;
if (!$isAdmin) {
    echo json_encode(['success' => false, 'error' => 'Admin access required']);
    exit;
}

// Get request data
$data = json_decode(file_get_contents('php://input'), true);
$operationType = $data['operation_type'] ?? null;
$ticketIds = $data['ticket_ids'] ?? [];
$parameters = $data['parameters'] ?? null;

// Validate input
if (!$operationType || empty($ticketIds)) {
    echo json_encode(['success' => false, 'error' => 'Operation type and ticket IDs required']);
    exit;
}

// Validate ticket IDs are integers
foreach ($ticketIds as $ticketId) {
    if (!is_numeric($ticketId)) {
        echo json_encode(['success' => false, 'error' => 'Invalid ticket ID format']);
        exit;
    }
}

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

$bulkOpsModel = new BulkOperationsModel($conn);
$ticketModel = new TicketModel($conn);

// Verify user can access all tickets in the bulk operation
// (Admins can access all, but this is defense-in-depth)
$accessibleTicketIds = [];
$inaccessibleCount = 0;
$tickets = $ticketModel->getTicketsByIds($ticketIds);

foreach ($ticketIds as $ticketId) {
    $ticketId = trim($ticketId);
    $ticket = $tickets[$ticketId] ?? null;

    if ($ticket && $ticketModel->canUserAccessTicket($ticket, $_SESSION['user'])) {
        $accessibleTicketIds[] = $ticketId;
    } else {
        $inaccessibleCount++;
    }
}

if (empty($accessibleTicketIds)) {
    echo json_encode(['success' => false, 'error' => 'No accessible tickets in selection']);
    exit;
}

// Use only accessible ticket IDs
$ticketIds = $accessibleTicketIds;

// Create bulk operation record
$operationId = $bulkOpsModel->createBulkOperation($operationType, $ticketIds, $_SESSION['user']['user_id'], $parameters);

if (!$operationId) {
    echo json_encode(['success' => false, 'error' => 'Failed to create bulk operation']);
    exit;
}

// Process the bulk operation
$result = $bulkOpsModel->processBulkOperation($operationId);

$conn->close();

if (isset($result['error'])) {
    echo json_encode([
        'success' => false,
        'error' => $result['error']
    ]);
} else {
    $message = "Bulk operation completed: {$result['processed']} succeeded, {$result['failed']} failed";
    if ($inaccessibleCount > 0) {
        $message .= " ($inaccessibleCount skipped - no access)";
    }
    echo json_encode([
        'success' => true,
        'operation_id' => $operationId,
        'processed' => $result['processed'],
        'failed' => $result['failed'],
        'skipped' => $inaccessibleCount,
        'message' => $message
    ]);
}