<?php
/**
 * Get Comments API
 * Returns paginated comments for a ticket (used by "Load more" on ticket view)
 */

require_once __DIR__ . '/bootstrap.php';
require_once dirname(__DIR__) . '/models/CommentModel.php';
require_once dirname(__DIR__) . '/models/TicketModel.php';

if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
    http_response_code(405);
    echo json_encode(['success' => false, 'error' => 'Method not allowed']);
    exit;
}

$ticketId = isset($_GET['ticket_id']) ? (int)$_GET['ticket_id'] : 0;
$offset   = isset($_GET['offset'])    ? max(0, (int)$_GET['offset'])   : 0;
$limit    = isset($_GET['limit'])     ? min(100, max(1, (int)$_GET['limit'])) : 50;

if ($ticketId <= 0) {
    http_response_code(400);
    echo json_encode(['success' => false, 'error' => 'Invalid ticket_id']);
    exit;
}

$ticketModel = new TicketModel($conn);
$ticket = $ticketModel->getTicketById($ticketId);
if (!$ticket || !$ticketModel->canUserAccessTicket($ticket, $currentUser)) {
    http_response_code(404);
    echo json_encode(['success' => false, 'error' => 'Ticket not found']);
    exit;
}

$commentModel  = new CommentModel($conn);
$total         = $commentModel->getCommentCount($ticketId);
$comments      = $commentModel->getCommentsByTicketId($ticketId, true, $limit, $offset);

echo json_encode([
    'success'  => true,
    'comments' => $comments,
    'total'    => $total,
    'offset'   => $offset,
    'limit'    => $limit,
    'has_more' => ($offset + $limit) < $total,
]);