<?php
/**
 * @copyright Copyright (c) 2018, Roeland Jago Douma <roeland@famdouma.nl>
 *
 * @author Roeland Jago Douma <roeland@famdouma.nl>
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

namespace OCA\Richdocuments;

use OCP\AppFramework\Utility\ITimeFactory;
use OCP\Capabilities\ICapability;
use OCP\Files\IAppData;
use OCP\Files\NotFoundException;
use OCP\Files\SimpleFS\ISimpleFolder;
use OCP\Http\Client\IClientService;
use OCP\IConfig;
use OCP\IURLGenerator;

class Capabilities implements ICapability {

	/** @var IConfig */
	private $config;
	/** @var IClientService */
	private $clientService;
	/** @var ITimeFactory */
	private $timeFactory;
	/** @var ISimpleFolder */
	private $appData;

	/**
	 * Capabilities constructor.
	 *
	 * @param IConfig $config
	 * @param IClientService $clientService
	 * @param IAppData $appData
	 * @param ITimeFactory $timeFactory
	 * @throws \OCP\Files\NotPermittedException
	 */
	public function __construct(IConfig $config, IClientService $clientService, IAppData $appData, ITimeFactory $timeFactory) {
		$this->config = $config;
		$this->clientService = $clientService;
		try {
			$this->appData = $appData->getFolder('richdocuments');
		} catch (NotFoundException $e) {
			$this->appData = $appData->newFolder('richdocuments');
		}
		$this->timeFactory = $timeFactory;
	}

	public function getCapabilities() {
		$collaboraCapabilities = $this->getCollaboraCapabilities();
		return [
			'richdocuments' => [
				'mimetypes' => [
					'application/vnd.oasis.opendocument.text',
					'application/vnd.oasis.opendocument.spreadsheet',
					'application/vnd.oasis.opendocument.presentation',
					'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
					'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
					'application/vnd.openxmlformats-officedocument.presentationml.presentation',
				],
				'collabora' => $collaboraCapabilities,
				'direct_editing' => false, //TODO: fix once proper capability is available
				'templates' => false, //TODO: fix once proper capability is available
			],
		];
	}

	/**
	 * @return array
	 * @throws \OCP\Files\NotPermittedException
	 */
	private function getCollaboraCapabilities() {
		try {
			$file = $this->appData->getFile('capabilities.json');
			$decodedFile = \json_decode($file->getContent(), true);
			if($decodedFile['timestamp'] + 3600 > $this->timeFactory->getTime()) {
				return \json_decode($decodedFile['data'], true);
			}
		} catch (NotFoundException $e) {
			$file = $this->appData->newFile('capabilities.json');
		}
		$remoteHost = $this->config->getAppValue('richdocuments', 'wopi_url');
		$capabilitiesEndpoint = $remoteHost . '/hosting/capabilities';

		$client = $this->clientService->newClient();
		try {
			$response = $client->get($capabilitiesEndpoint);
		} catch (\Exception $e) {
			return [];
		}

		$responseBody = $response->getBody();
		$file->putContent(
			\json_encode([
				'data' => $responseBody,
				'timestamp' => $this->timeFactory->getTime(),
			])
		);
		return \json_decode($responseBody, true);
	}
}