<?php
/**
 * @author Christoph Wurst <christoph@owncloud.com>
 * @author Joas Schilling <coding@schilljs.com>
 * @author Jörn Friedrich Dreyer <jfd@butonic.de>
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 * @author Vincent Petry <pvince81@owncloud.com>
 *
 * @copyright Copyright (c) 2018, ownCloud GmbH
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * 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, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

namespace OCA\Files\Controller;

use OC\AppFramework\Http\Request;
use OCP\App\IAppManager;
use OCP\AppFramework\Controller;
use OCP\AppFramework\Http\ContentSecurityPolicy;
use OCP\AppFramework\Http\RedirectResponse;
use OCP\AppFramework\Http\TemplateResponse;
use OCP\Files\Folder;
use OCP\Files\NotFoundException;
use OCP\IConfig;
use OCP\IL10N;
use OCP\INavigationManager;
use OCP\IRequest;
use OCP\IURLGenerator;
use OCP\IUserSession;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use OCP\AppFramework\Http;
use Symfony\Component\EventDispatcher\GenericEvent;

/**
 * Class ViewController
 *
 * @package OCA\Files\Controller
 */
class ViewController extends Controller {
	/** @var string */
	protected $appName;
	/** @var IRequest */
	protected $request;
	/** @var IURLGenerator */
	protected $urlGenerator;
	/** @var INavigationManager */
	protected $navigationManager;
	/** @var IL10N */
	protected $l10n;
	/** @var IConfig */
	protected $config;
	/** @var EventDispatcherInterface */
	protected $eventDispatcher;
	/** @var IUserSession */
	protected $userSession;
	/** @var IAppManager */
	protected $appManager;
	/** @var \OCP\Files\Folder */
	protected $rootFolder;

	/**
	 * @param string $appName
	 * @param IRequest $request
	 * @param IURLGenerator $urlGenerator
	 * @param IL10N $l10n
	 * @param IConfig $config
	 * @param EventDispatcherInterface $eventDispatcherInterface
	 * @param IUserSession $userSession
	 * @param IAppManager $appManager
	 * @param Folder $rootFolder
	 */
	public function __construct($appName,
								IRequest $request,
								IURLGenerator $urlGenerator,
								IL10N $l10n,
								IConfig $config,
								EventDispatcherInterface $eventDispatcherInterface,
								IUserSession $userSession,
								IAppManager $appManager,
								Folder $rootFolder
	) {
		parent::__construct($appName, $request);
		$this->appName = $appName;
		$this->request = $request;
		$this->urlGenerator = $urlGenerator;
		$this->l10n = $l10n;
		$this->config = $config;
		$this->eventDispatcher = $eventDispatcherInterface;
		$this->userSession = $userSession;
		$this->appManager = $appManager;
		$this->rootFolder = $rootFolder;
	}

	/**
	 * @param string $appName
	 * @param string $scriptName
	 * @return string
	 */
	protected function renderScript($appName, $scriptName) {
		$content = '';
		$appPath = \OC_App::getAppPath($appName);
		$scriptPath = $appPath . '/' . $scriptName;
		if (\file_exists($scriptPath)) {
			// TODO: sanitize path / script name ?
			\ob_start();
			include $scriptPath;
			$content = \ob_get_contents();
			@\ob_end_clean();
		}
		return $content;
	}

	/**
	 * FIXME: Replace with non static code
	 *
	 * @return array
	 * @throws \OCP\Files\NotFoundException
	 */
	protected function getStorageInfo() {
		$dirInfo = \OC\Files\Filesystem::getFileInfo('/', false);
		return \OC_Helper::getStorageInfo('/', $dirInfo);
	}

	/**
	 * @NoCSRFRequired
	 * @NoAdminRequired
	 *
	 * @param string $dir
	 * @param string $view
	 * @param string $fileid
	 * @return TemplateResponse
	 */
	public function index($dir = '', $view = '', $fileid = null, $details = null) {
		$fileNotFound = false;
		if ($fileid !== null) {
			try {
				return $this->showFile($fileid, $details);
			} catch (NotFoundException $e) {
				$fileNotFound = true;
			}
		}

		$nav = new \OCP\Template('files', 'appnavigation', '');

		// Load the files we need
		\OCP\Util::addStyle('files', 'files');
		\OCP\Util::addStyle('files', 'upload');
		\OCP\Util::addStyle('files', 'mobile');
		\OCP\Util::addScript('files', 'app');
		\OCP\Util::addScript('files', 'file-upload');
		\OCP\Util::addScript('files', 'newfilemenu');
		\OCP\Util::addScript('files', 'jquery.fileupload');
		\OCP\Util::addScript('files', 'jquery-visibility');
		\OCP\Util::addScript('files', 'fileinfomodel');
		\OCP\Util::addScript('files', 'filesummary');
		\OCP\Util::addScript('files', 'breadcrumb');
		\OCP\Util::addScript('files', 'filelist');
		\OCP\Util::addScript('files', 'search');

		\OCP\Util::addScript('files', 'favoritesfilelist');
		\OCP\Util::addScript('files', 'tagsplugin');
		\OCP\Util::addScript('files', 'favoritesplugin');

		\OCP\Util::addScript('files', 'detailfileinfoview');
		\OCP\Util::addScript('files', 'detailtabview');
		\OCP\Util::addScript('files', 'mainfileinfodetailview');
		\OCP\Util::addScript('files', 'detailsview');
		\OCP\Util::addStyle('files', 'detailsView');

		\OC_Util::addVendorScript('core', 'handlebars/handlebars');

		\OCP\Util::addScript('files', 'fileactions');
		\OCP\Util::addScript('files', 'fileactionsmenu');
		\OCP\Util::addScript('files', 'files');
		\OCP\Util::addScript('files', 'keyboardshortcuts');
		\OCP\Util::addScript('files', 'navigation');

		// if IE8 and "?dir=path&view=someview" was specified, reformat the URL to use a hash like "#?dir=path&view=someview"
		$isIE8 = $this->request->isUserAgent([Request::USER_AGENT_IE_8]);
		if ($isIE8 && ($dir !== '' || $view !== '')) {
			$dir = !empty($dir) ? $dir : '/';
			$view = !empty($view) ? $view : 'files';
			$hash = '#?dir=' . \OCP\Util::encodePath($dir);
			if ($view !== 'files') {
				$hash .= '&view=' . \urlencode($view);
			}
			return new RedirectResponse($this->urlGenerator->linkToRoute('files.view.index') . $hash);
		}

		// mostly for the home storage's free space
		// FIXME: Make non static
		$storageInfo = $this->getStorageInfo();

		\OCA\Files\App::getNavigationManager()->add(
			[
				'id' => 'favorites',
				'appname' => 'files',
				'script' => 'simplelist.php',
				'order' => 5,
				'name' => $this->l10n->t('Favorites')
			]
		);

		$user = $this->userSession->getUser()->getUID();

		$navItems = \OCA\Files\App::getNavigationManager()->getAll();
		\usort($navItems, function ($item1, $item2) {
			return $item1['order'] - $item2['order'];
		});
		$nav->assign('navigationItems', $navItems);
		$nav->assign('webdavUrl', $this->urlGenerator->getAbsoluteUrl($this->urlGenerator->linkTo('', 'remote.php') . '/dav/files/' . \rawurlencode($user) . '/'));

		$contentItems = [];

		// render the container content for every navigation item
		foreach ($navItems as $item) {
			$content = '';
			if (isset($item['script'])) {
				$content = $this->renderScript($item['appname'], $item['script']);
			}
			$contentItem = [];
			$contentItem['id'] = $item['id'];
			$contentItem['content'] = $content;
			$contentItems[] = $contentItem;
		}

		$this->eventDispatcher->dispatch('OCA\Files::loadAdditionalScripts');

		$params = [];
		$params['usedSpacePercent'] = (int)$storageInfo['relative'];
		$params['owner'] = $storageInfo['owner'];
		$params['ownerDisplayName'] = $storageInfo['ownerDisplayName'];
		$params['isPublic'] = false;
		$params['mailNotificationEnabled'] = $this->config->getAppValue('core', 'shareapi_allow_mail_notification', 'no');
		$params['mailPublicNotificationEnabled'] = $this->config->getAppValue('core', 'shareapi_allow_public_notification', 'no');
		$params['socialShareEnabled'] = $this->config->getAppValue('core', 'shareapi_allow_social_share', 'yes');
		$params['allowShareWithLink'] = $this->config->getAppValue('core', 'shareapi_allow_links', 'yes');
		$params['defaultFileSorting'] = $this->config->getUserValue($user, 'files', 'file_sorting', 'name');
		$params['defaultFileSortingDirection'] = $this->config->getUserValue($user, 'files', 'file_sorting_direction', 'asc');
		$showHidden = (bool) $this->config->getUserValue($this->userSession->getUser()->getUID(), 'files', 'show_hidden', false);
		$params['showHiddenFiles'] = $showHidden ? 1 : 0;
		$params['fileNotFound'] = $fileNotFound ? 1 : 0;
		$params['appNavigation'] = $nav;
		$params['appContents'] = $contentItems;

		$response = new TemplateResponse(
			$this->appName,
			'index',
			$params
		);
		$policy = new ContentSecurityPolicy();
		$policy->addAllowedFrameDomain('\'self\'');
		$response->setContentSecurityPolicy($policy);

		return $response;
	}

	/**
	 * Redirects to the file list and highlight the given file id
	 *
	 * @param string $fileId file id to show
	 * @return RedirectResponse redirect response or not found response
	 * @throws \OCP\Files\NotFoundException
	 *
	 * @NoCSRFRequired
	 * @NoAdminRequired
	 */
	public function showFile($fileId, $details = null) {
		$uid = $this->userSession->getUser()->getUID();
		$baseFolder = $this->rootFolder->get($uid . '/files/');
		$files = $baseFolder->getById($fileId);
		$params = [];

		if (empty($files)) {
			// probe apps to see if the file is in a different state and can be accessed
			// through another URL
			$event = new GenericEvent(null, [
				'fileid' => $fileId,
				'uid' => $uid,
				'resolvedWebLink' => null,
				'resolvedDavLink' => null,
			]);
			$this->eventDispatcher->dispatch('files.resolvePrivateLink', $event);

			$webUrl = $event->getArgument('resolvedWebLink');
			$webdavUrl = $event->getArgument('resolvedDavLink');
		} else {
			$file = \current($files);
			if ($file instanceof Folder) {
				// set the full path to enter the folder
				$params['dir'] = $baseFolder->getRelativePath($file->getPath());
			} else {
				// set parent path as dir
				$params['dir'] = $baseFolder->getRelativePath($file->getParent()->getPath());
				// and scroll to the entry
				$params['scrollto'] = $file->getName();
			}
			if ($details !== null) {
				$params['details'] = $details;
			}
			$webUrl = $this->urlGenerator->linkToRoute('files.view.index', $params);

			$webdavUrl = $this->urlGenerator->linkTo('', 'remote.php') . '/dav/files/' . \rawurlencode($uid) . '/';
			$webdavUrl .= \OCP\Util::encodePath(\ltrim($baseFolder->getRelativePath($file->getPath()), '/'));
		}

		if ($webUrl) {
			$response = new RedirectResponse($webUrl);
			if ($webdavUrl !== null) {
				$response->addHeader('Webdav-Location', $webdavUrl);
			}
			return $response;
		}

		if ($this->userSession->isLoggedIn() and empty($files)) {
			$param["error"] = $this->l10n->t("You don't have permissions to access this file/folder - Please contact the owner to share it with you.");
			$response = new TemplateResponse("core", 'error', ["errors" => [$param]], 'guest');
			$response->setStatus(Http::STATUS_NOT_FOUND);
			return $response;
		}

		// FIXME: potentially dead code as the user is normally always logged in non-public routes
		throw new \OCP\Files\NotFoundException();
	}
}