<?php

declare(strict_types=1);

/**
 * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

namespace OCA\ServerInfo\Controller;

use OCA\ServerInfo\DatabaseStatistics;
use OCA\ServerInfo\FpmStatistics;
use OCA\ServerInfo\Os;
use OCA\ServerInfo\PhpStatistics;
use OCA\ServerInfo\SessionStatistics;
use OCA\ServerInfo\ShareStatistics;
use OCA\ServerInfo\StorageStatistics;
use OCA\ServerInfo\SystemStatistics;
use OCP\AppFramework\Http;
use OCP\AppFramework\Http\DataResponse;
use OCP\AppFramework\OCSController;
use OCP\IConfig;
use OCP\IGroupManager;
use OCP\IL10N;
use OCP\IRequest;
use OCP\IUserSession;

class ApiController extends OCSController {
	public function __construct(
		string $appName,
		IRequest $request,
		private IConfig $config,
		private IGroupManager $groupManager,
		private ?IUserSession $userSession,
		private Os $os,
		private SystemStatistics $systemStatistics,
		private StorageStatistics $storageStatistics,
		private PhpStatistics $phpStatistics,
		private FpmStatistics $fpmStatistics,
		private DatabaseStatistics $databaseStatistics,
		private ShareStatistics $shareStatistics,
		private SessionStatistics $sessionStatistics,
		private IL10N $l10n,
	) {
		parent::__construct($appName, $request);
	}

	/**
	 * Check if authorized to view serverinfo API.
	 */
	private function checkAuthorized(): bool {
		// check for monitoring privilege
		$token = $this->request->getHeader('NC-Token');
		if (!empty($token)) {
			$storedToken = $this->config->getAppValue('serverinfo', 'token', '');
			if (hash_equals($storedToken, $token)) {
				return true;
			}
		}

		// fallback to admin privilege
		$userSession = $this->userSession;
		if ($userSession === null) {
			return false;
		}

		$user = $userSession->getUser();
		if ($user === null) {
			return false;
		}

		return $this->groupManager->isAdmin($user->getUID());
	}

	/**
	 * @NoCSRFRequired
	 * @NoAdminRequired
	 * @PublicPage
	 * @BruteForceProtection(action=serverinfo)
	 */
	public function info(bool $skipApps = true, bool $skipUpdate = true): DataResponse {
		if (!$this->checkAuthorized()) {
			$response = new DataResponse(['message' => 'Unauthorized']);
			$response->throttle();
			$response->setStatus(Http::STATUS_UNAUTHORIZED);
			return $response;
		}
		return new DataResponse([
			'nextcloud' => [
				'system' => $this->systemStatistics->getSystemStatistics($skipApps, $skipUpdate),
				'storage' => $this->storageStatistics->getStorageStatistics(),
				'shares' => $this->shareStatistics->getShareStatistics()
			],
			'server' => [
				'webserver' => $this->getWebserver(),
				'php' => $this->phpStatistics->getPhpStatistics(),
				'fpm' => $this->fpmStatistics->getFpmStatistics(),
				'database' => $this->databaseStatistics->getDatabaseStatistics()
			],
			'activeUsers' => $this->sessionStatistics->getSessionStatistics()
		]);
	}

	public function BasicData(): DataResponse {
		$servertime = $this->os->getTime();
		$uptime = $this->formatUptime($this->os->getUptime());

		return new DataResponse([
			'servertime' => $servertime,
			'uptime' => $uptime,
			'thermalzones' => $this->os->getThermalZones()
		]);
	}

	public function DiskData(): DataResponse {
		$result = $this->os->getDiskData();
		return new DataResponse($result);
	}

	/**
	 * Get webserver information
	 */
	private function getWebserver(): string {
		if (isset($_SERVER['SERVER_SOFTWARE'])) {
			return $_SERVER['SERVER_SOFTWARE'];
		}
		return 'unknown';
	}

	/**
	 * Return the uptime of the system as human readable value
	 */
	private function formatUptime(int $uptime): string {
		if ($uptime === -1) {
			return $this->l10n->t('Unknown');
		}

		try {
			$boot = new \DateTime($uptime . ' seconds ago');
		} catch (\Exception $e) {
			return $this->l10n->t('Unknown');
		}

		$interval = $boot->diff(new \DateTime());
		$days = $interval->days;
		$hours = $interval->h;
		$minutes = $interval->i;
		$seconds = $interval->s;

		if ($days > 0) {
			return $this->l10n->t('%1$d days, %2$d hours, %3$d minutes, %4$d seconds', [$days, $hours, $minutes, $seconds]);
		}
		return $this->l10n->t('%1$d hours, %2$d minutes, %3$d seconds', [$hours, $minutes, $seconds]);
	}
}
