<?php

/**
 * tickets_api.php — Bearer-key read endpoint (list/triage + read-one).
 *
 * GET only. Requires 'read' scope (a 'read_write' key also satisfies it).
 * By default, a key only sees public-visibility tickets — Confidential and
 * Internal tickets are excluded, the same as they would be for a regular user
 * with no special access. An admin can mark a specific key see_all_visibility
 * (API Key Management) when it genuinely needs the full queue.
 *
 *   GET ?ticket_id=NNN            -> {success, ticket, comments}
 *   GET ?status=&priority=&host=  -> {success, tickets, page, total, pages}
 *       &page=&limit=
 */

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

require_once dirname(__DIR__) . '/helpers/ErrorHandler.php';
ErrorHandler::init();

// Rate limiting (same pattern as the other Bearer API endpoints)
require_once dirname(__DIR__) . '/middleware/RateLimitMiddleware.php';
RateLimitMiddleware::apply('api');

require_once dirname(__DIR__) . '/config/config.php';
require_once dirname(__DIR__) . '/helpers/Database.php';
require_once dirname(__DIR__) . '/middleware/ApiKeyAuth.php';
require_once dirname(__DIR__) . '/models/TicketModel.php';
require_once dirname(__DIR__) . '/models/CommentModel.php';

try {
    $conn = Database::getConnection();
} catch (Throwable $e) {
    error_log('tickets_api: DB connection failed: ' . $e->getMessage());
    http_response_code(500);
    echo json_encode(['success' => false, 'error' => 'Internal server error']);
    exit;
}

$apiKeyAuth = new ApiKeyAuth($conn);

try {
    $apiKeyAuth->authenticate();
} catch (Exception $e) {
    // ApiKeyAuth already sent the 401 response.
    exit;
}

// Reads only need the 'read' scope.
$apiKeyAuth->requireScope('read');

// Keys are public-ticket-only by default (#70) — a key must be explicitly
// marked see_all_visibility to bypass Confidential/Internal restrictions.
// Reuse TicketModel's existing per-user visibility plumbing with a synthetic
// "no special access" user rather than a separate SQL path, so this stays in
// lockstep with however visibility rules evolve for real users. user_id is
// -1, not 0: canUserAccessTicket() does a PHP-level (int) cast for the
// confidential-ticket check, and (int)null === 0, so an unassigned
// confidential ticket's assigned_to would otherwise false-positive-match a
// synthetic user_id of 0. No real user_id is ever <= 0, so -1 can't collide.
$keyContext = $apiKeyAuth->getKeyContext();
$visibilityUser = !empty($keyContext['see_all_visibility'])
    ? null
    : ['user_id' => -1, 'is_admin' => false, 'groups' => ''];

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

$ticketModel = new TicketModel($conn);

// ── READ ONE ──────────────────────────────────────────────────────────────
if (isset($_GET['ticket_id']) && trim((string)$_GET['ticket_id']) !== '') {
    $ticketId = trim((string)$_GET['ticket_id']);

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

    // A public-only key gets a plain 404 for a non-public ticket — same as a
    // regular user hitting a ticket they can't see — rather than a 403 that
    // would confirm the ticket exists.
    if ($visibilityUser !== null && !$ticketModel->canUserAccessTicket($ticket, $visibilityUser)) {
        http_response_code(404);
        echo json_encode(['success' => false, 'error' => 'Ticket not found']);
        exit;
    }

    // Flat list of comments (newest first) — same fetch the ticket view uses.
    $commentModel = new CommentModel($conn);
    $comments = $commentModel->getCommentsByTicketId($ticketId, false);

    echo json_encode([
        'success' => true,
        'ticket' => $ticket,
        'comments' => $comments,
    ]);
    exit;
}

// ── LIST / TRIAGE ───────────────────────────────────────────────────────────
$status = (isset($_GET['status']) && trim((string)$_GET['status']) !== '')
    ? trim((string)$_GET['status'])
    : 'Open';

$page = isset($_GET['page']) ? (int)$_GET['page'] : 1;
if ($page < 1) {
    $page = 1;
}

$limit = isset($_GET['limit']) ? (int)$_GET['limit'] : 25;
if ($limit < 1) {
    $limit = 25;
}
if ($limit > 100) {
    $limit = 100; // cap
}

$filters = [];
if (isset($_GET['priority']) && trim((string)$_GET['priority']) !== '') {
    $priority = (int)$_GET['priority'];
    if ($priority >= 1 && $priority <= 5) {
        // Exact-priority match via the min/max range filter.
        $filters['priority_min'] = $priority;
        $filters['priority_max'] = $priority;
    }
}

// hwmon puts the host in the title (e.g. "[hostname] ..."), so a host filter is a
// title substring match — served by getAllTickets's `search` param (title search).
$search = null;
if (isset($_GET['host']) && trim((string)$_GET['host']) !== '') {
    $search = trim((string)$_GET['host']);
}

// $visibilityUser is null (skip filtering, full queue) only for a key marked
// see_all_visibility; otherwise it restricts to public tickets (see above).
$result = $ticketModel->getAllTickets(
    $page,
    $limit,
    $status,
    'ticket_id',
    'desc',
    null,
    null,
    $search,
    $filters,
    $visibilityUser
);

echo json_encode([
    'success' => true,
    'tickets' => $result['tickets'],
    'page' => $result['current_page'],
    'total' => $result['total'],
    'pages' => $result['pages'],
]);
exit;