<?php declare(strict_types = 0);
/*
** L2 Topology - GET controller.
** Renders either the live snapshot or any stored snapshot chosen by ?ts=<epoch>.
*/

namespace Modules\WecomCenter\Actions;

use CController;
use CControllerResponseData;
use CWebUser;
use Modules\WecomCenter\Lib\L2Store;

class L2TopologyView extends CController {

	protected function init() {
		$this->disableCsrfValidation();
	}

	protected function checkInput() {
		return true;
	}

	protected function checkPermissions() {
		return CWebUser::getType() >= USER_TYPE_ZABBIX_USER;
	}

	protected function doAction() {
		L2Store::ensureSchema();
		$cfg = L2Store::getConfig();

		$ts_raw = $_REQUEST['ts'] ?? '';
		$ts = ($ts_raw === '' || $ts_raw === null) ? null : (int) $ts_raw;

		$requested_ts = $ts;
		$snap = L2Store::snapshotAt($ts);
		$json = $snap['json'] ?? null;
		$used_ts = $snap['ts'];
		// A stale bookmark / hand-edited ?ts= must not leave an empty page.
		// If that exact snapshot is gone, fall back to the live latest view.
		if ($ts !== null && ($json === null || $json === '')) {
			$ts = null;
			$snap = L2Store::snapshotAt(null);
			$json = $snap['json'] ?? null;
			$used_ts = $snap['ts'];
		}

		// The selector must cover the full retention window, not only the
		// latest 500 rows.  At 5 minutes / 7 days this is ~2,016 points.
		$history_days = max(1, min(30, (int) ($cfg['history_days'] ?? 7)));
		$history_interval = max(5, (int) ($cfg['history_interval_min'] ?? 5));
		$history_limit = (int) ceil($history_days * 1440 / $history_interval) + 30;
		$history_limit = max(500, min(10000, $history_limit));

		$this->setResponse(new CControllerResponseData([
			'title'      => _('L2 Topology'),
			'snap_json'  => ($json !== null && $json !== '') ? $json : 'null',
			'cfg_json'   => json_encode($cfg, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
			'history'    => L2Store::listHistory($history_limit),
			'used_ts'    => $used_ts,
			'requested_ts' => $ts,
			'is_live'    => ($ts === null),
			'cfg_refresh'=> (int) $cfg['refresh_seconds']
		]));
	}
}