<?php
declare(strict_types=1);
/**
 * @copyright Copyright (c) 2016 Joas Schilling <coding@schilljs.com>
 *
 * @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\Spreed\Notification;


use OCA\Spreed\Chat\RichMessageHelper;
use OCA\Spreed\Chat\SystemMessage\Parser;
use OCA\Spreed\Exceptions\RoomNotFoundException;
use OCA\Spreed\Manager;
use OCA\Spreed\Room;
use OCP\Comments\ICommentsManager;
use OCP\Comments\NotFoundException;
use OCP\IL10N;
use OCP\IURLGenerator;
use OCP\IUser;
use OCP\IUserManager;
use OCP\L10N\IFactory;
use OCP\Notification\INotification;
use OCP\Notification\INotifier;
use OCP\RichObjectStrings\Definitions;
use OCP\Share\Exceptions\ShareNotFound;
use OCP\Share\IManager as IShareManager;

class Notifier implements INotifier {

	/** @var IFactory */
	protected $lFactory;

	/** @var IURLGenerator */
	protected $url;

	/** @var IUserManager */
	protected $userManager;

	/** @var IShareManager */
	private $shareManager;

	/** @var Manager */
	protected $manager;

	/** @var ICommentsManager */
	protected $commentManager;

	/** @var RichMessageHelper */
	protected $richMessageHelper;

	/** @var Parser */
	protected $systemMessageParser;

	/** @var Definitions */
	protected $definitions;

	public function __construct(IFactory $lFactory,
								IURLGenerator $url,
								IUserManager $userManager,
								IShareManager $shareManager,
								Manager $manager,
								ICommentsManager $commentManager,
								RichMessageHelper $richMessageHelper,
								Parser $systemMessageParser,
								Definitions $definitions) {
		$this->lFactory = $lFactory;
		$this->url = $url;
		$this->userManager = $userManager;
		$this->shareManager = $shareManager;
		$this->manager = $manager;
		$this->commentManager = $commentManager;
		$this->richMessageHelper = $richMessageHelper;
		$this->systemMessageParser = $systemMessageParser;
		$this->definitions = $definitions;
	}

	/**
	 * @param INotification $notification
	 * @param string $languageCode The code of the language that should be used to prepare the notification
	 * @return INotification
	 * @throws \InvalidArgumentException When the notification was not prepared by a notifier
	 * @since 9.0.0
	 */
	public function prepare(INotification $notification, $languageCode): INotification {
		if ($notification->getApp() !== 'spreed') {
			throw new \InvalidArgumentException('Incorrect app');
		}

		$l = $this->lFactory->get('spreed', $languageCode);

		try {
			$room = $this->manager->getRoomByToken($notification->getObjectId());
		} catch (RoomNotFoundException $e) {
			try {
				// Before 3.2.3 the id was passed in notifications
				$room = $this->manager->getRoomById((int) $notification->getObjectId());
			} catch (RoomNotFoundException $e) {
				// Room does not exist
				throw new \InvalidArgumentException('Invalid room');
			}
		}

		$notification
			->setIcon($this->url->getAbsoluteURL($this->url->imagePath('spreed', 'app-dark.svg')))
			->setLink($this->url->linkToRouteAbsolute('spreed.Page.index') . '?token=' . $room->getToken());

		$subject = $notification->getSubject();
		if ($subject === 'invitation') {
			return $this->parseInvitation($notification, $room, $l);
		}
		if ($subject === 'call') {
			if ($room->getObjectType() === 'share:password') {
				return $this->parsePasswordRequest($notification, $room, $l);
			}
			return $this->parseCall($notification, $room, $l);
		}
		if ($subject === 'mention' ||  $subject === 'chat') {
			return $this->parseChatMessage($notification, $room, $l);
		}

		throw new \InvalidArgumentException('Unknown subject');
	}

	/**
	 * @param INotification $notification
	 * @param Room $room
	 * @param IL10N $l
	 * @return INotification
	 * @throws \InvalidArgumentException
	 */
	protected function parseChatMessage(INotification $notification, Room $room, IL10N $l): INotification {
		if ($notification->getObjectType() !== 'chat') {
			throw new \InvalidArgumentException('Unknown object type');
		}

		$subjectParameters = $notification->getSubjectParameters();

		$richSubjectUser = null;
		$isGuest = false;
		if ($subjectParameters['userType'] === 'users') {
			$userId = $subjectParameters['userId'];
			$user = $this->userManager->get($userId);

			if ($user instanceof IUser) {
				$richSubjectUser = [
					'type' => 'user',
					'id' => $userId,
					'name' => $user->getDisplayName(),
				];
			}
		} else {
			$isGuest = true;
		}

		$richSubjectCall = [
			'type' => 'call',
			'id' => $room->getId(),
			'name' => $room->getName() !== '' ? $room->getName() : $l->t('a conversation'),
			'call-type' => $this->getRoomType($room),
		];

		$messageParameters = $notification->getMessageParameters();
		if (!isset($messageParameters['commentId'])) {
			throw new \InvalidArgumentException('Unknown comment');
		}

		try {
			$comment = $this->commentManager->get($messageParameters['commentId']);
		} catch (NotFoundException $e) {
			throw new \InvalidArgumentException('Unknown comment');
		}

		if ($comment->getVerb() === 'system') {
			$user = $this->userManager->get($notification->getUser());
			$this->systemMessageParser->setUserInfo($user, $l);
			list($richMessage, $richMessageParameters) = $this->systemMessageParser->parseMessage($comment);
		} else {
			list($richMessage, $richMessageParameters) = $this->richMessageHelper->getRichMessage($comment);
		}

		$placeholders = $replacements = [];
		foreach ($richMessageParameters as $placeholder => $parameter) {
			$placeholders[] = '{' . $placeholder . '}';
			if ($parameter['type'] === 'user') {
				$replacements[] = '@' . $parameter['name'];
			} else {
				$replacements[] = $parameter['name'];
			}
		}

		$notification->setParsedMessage(str_replace($placeholders, $replacements, $richMessage));
		$notification->setRichMessage($richMessage, $richMessageParameters);

		if ($notification->getSubject() === 'chat') {
			$notification
				->setParsedSubject(str_replace('{user}', $user->getDisplayName(), $l->t('{user} sent you a private message')))
				->setRichSubject(
					$l->t('{user} sent you a private message'), [
						'user' => $richSubjectUser,
						'call' => $richSubjectCall,
					]
				);

		} else if ($room->getType() === Room::ONE_TO_ONE_CALL) {
			$notification
				->setParsedSubject(
					$l->t('%s mentioned you in a private conversation', [$user->getDisplayName()])
				)
				->setRichSubject(
					$l->t('{user} mentioned you in a private conversation'), [
						'user' => $richSubjectUser,
						'call' => $richSubjectCall,
					]
				);

		} else if (\in_array($room->getType(), [Room::GROUP_CALL, Room::PUBLIC_CALL], true)) {
			if ($richSubjectUser && $room->getName() !== '') {
				$notification
					->setParsedSubject(
						$l->t('%s mentioned you in a group conversation: %s', [$user->getDisplayName(), $room->getName()])
					)
					->setRichSubject(
						$l->t('{user} mentioned you in a group conversation: {call}'), [
							'user' => $richSubjectUser,
							'call' => $richSubjectCall,
						]
					);
			} else if ($richSubjectUser) {
				$notification
					->setParsedSubject(
						$l->t('%s mentioned you in a group conversation', [$user->getDisplayName()])
					)
					->setRichSubject(
						$l->t('{user} mentioned you in a group conversation'), [
							'user' => $richSubjectUser,
							'call' => $richSubjectCall,
						]
					);
			} else if (!$isGuest && $room->getName() !== '') {
				$notification
					->setParsedSubject(
						$l->t('You were mentioned in a group conversation by a deleted user: %s', [$room->getName()])
					)
					->setRichSubject(
						$l->t('You were mentioned in a group conversation by a deleted user: {call}'), [
							'call' => $richSubjectCall,
						]
					);
			} else if (!$isGuest) {
				$notification
					->setParsedSubject(
						$l->t('You were mentioned in a group conversation by a deleted user')
					)
					->setRichSubject(
						$l->t('You were mentioned in a group conversation by a deleted user'), [
							'call' => $richSubjectCall,
						]
					);
			} else if ($room->getName() !== '') {
				$notification
					->setParsedSubject(
						$l->t('A guest mentioned you in a group conversation: %s', [$room->getName()])
					)
					->setRichSubject(
						$l->t('A guest mentioned you in a group conversation: {call}'), [
							'call' => $richSubjectCall,
						]
					);
			} else {
				$notification
					->setParsedSubject(
						$l->t('A guest mentioned you in a group conversation')
					)
					->setRichSubject(
						$l->t('A guest mentioned you in a group conversation'), [
							'call' => $richSubjectCall,
						]
					);
			}
		} else {
			throw new \InvalidArgumentException('Unknown room type');
		}

		return $notification;
	}

	/**
	 * @param Room $room
	 * @return string
	 * @throws \InvalidArgumentException
	 */
	protected function getRoomType(Room $room) {
		switch ($room->getType()) {
			case Room::ONE_TO_ONE_CALL:
				return 'one2one';
			case Room::GROUP_CALL:
				return 'group';
			case Room::PUBLIC_CALL:
				return 'public';
			default:
				throw new \InvalidArgumentException('Unknown room type');
		}
	}

	/**
	 * @param INotification $notification
	 * @param Room $room
	 * @param IL10N $l
	 * @return INotification
	 * @throws \InvalidArgumentException
	 */
	protected function parseInvitation(INotification $notification, Room $room, IL10N $l): INotification {
		if ($notification->getObjectType() !== 'room') {
			throw new \InvalidArgumentException('Unknown object type');
		}

		$parameters = $notification->getSubjectParameters();
		$uid = $parameters['actorId'] ?? $parameters[0];

		$user = $this->userManager->get($uid);
		if (!$user instanceof IUser) {
			throw new \InvalidArgumentException('Calling user does not exist anymore');
		}

		if ($room->getType() === Room::ONE_TO_ONE_CALL) {
			$notification
				->setParsedSubject(
					$l->t('%s invited you to a private conversation', [$user->getDisplayName()])
				)
				->setRichSubject(
					$l->t('{user} invited you to a private conversation'), [
						'user' => [
							'type' => 'user',
							'id' => $uid,
							'name' => $user->getDisplayName(),
						],
						'call' => [
							'type' => 'call',
							'id' => $room->getId(),
							'name' => $l->t('a conversation'),
							'call-type' => $this->getRoomType($room),
						],
					]
				);

		} else if (\in_array($room->getType(), [Room::GROUP_CALL, Room::PUBLIC_CALL], true)) {
			if ($room->getName() !== '') {
				$notification
					->setParsedSubject(
						$l->t('%s invited you to a group conversation: %s', [$user->getDisplayName(), $room->getName()])
					)
					->setRichSubject(
						$l->t('{user} invited you to a group conversation: {call}'), [
							'user' => [
								'type' => 'user',
								'id' => $uid,
								'name' => $user->getDisplayName(),
							],
							'call' => [
								'type' => 'call',
								'id' => $room->getId(),
								'name' => $room->getName(),
								'call-type' => $this->getRoomType($room),
							],
						]
					);
			} else {
				$notification
					->setParsedSubject(
						$l->t('%s invited you to a group conversation', [$user->getDisplayName()])
					)
					->setRichSubject(
						$l->t('{user} invited you to a group conversation'), [
							'user' => [
								'type' => 'user',
								'id' => $uid,
								'name' => $user->getDisplayName(),
							],
							'call' => [
								'type' => 'call',
								'id' => $room->getId(),
								'name' => $l->t('a conversation'),
								'call-type' => $this->getRoomType($room),
							],
						]
					);
			}
		} else {
			throw new \InvalidArgumentException('Unknown room type');
		}

		return $notification;
	}

	/**
	 * @param INotification $notification
	 * @param Room $room
	 * @param IL10N $l
	 * @return INotification
	 * @throws \InvalidArgumentException
	 */
	protected function parseCall(INotification $notification, Room $room, IL10N $l): INotification {
		if ($notification->getObjectType() !== 'call') {
			throw new \InvalidArgumentException('Unknown object type');
		}

		if ($room->getType() === Room::ONE_TO_ONE_CALL) {
			$parameters = $notification->getSubjectParameters();
			$calleeId = $parameters['callee'];
			$user = $this->userManager->get($calleeId);
			if ($user instanceof IUser) {
				$notification
					->setParsedSubject(
						str_replace('{user}', $user->getDisplayName(), $l->t('{user} wants to talk with you'))
					)
					->setRichSubject(
						$l->t('{user} wants to talk with you'), [
							'user' => [
								'type' => 'user',
								'id' => $calleeId,
								'name' => $user->getDisplayName(),
							],
							'call' => [
								'type' => 'call',
								'id' => $room->getId(),
								'name' => $l->t('a conversation'),
								'call-type' => $this->getRoomType($room),
							],
						]
					);
			} else {
				throw new \InvalidArgumentException('Calling user does not exist anymore');
			}

		} else if (\in_array($room->getType(), [Room::GROUP_CALL, Room::PUBLIC_CALL], true)) {
			if ($room->getName() !== '') {
				$notification
					->setParsedSubject(
						str_replace('{call}', $room->getName(), $l->t('A group call has started in {call}'))
					)
					->setRichSubject(
						$l->t('A group call has started in {call}'), [
							'call' => [
								'type' => 'call',
								'id' => $room->getId(),
								'name' => $room->getName(),
								'call-type' => $this->getRoomType($room),
							],
						]
					);
			} else {
				$notification
					->setParsedSubject($l->t('A group call has started'))
					->setRichSubject($l->t('A group call has started'), [
						'call' => [
							'type' => 'call',
							'id' => $room->getId(),
							'name' => $l->t('a conversation'),
							'call-type' => $this->getRoomType($room),
						],
					]);
			}

		} else {
			throw new \InvalidArgumentException('Unknown room type');
		}

		return $notification;
	}

	/**
	 * @param INotification $notification
	 * @param Room $room
	 * @param IL10N $l
	 * @return INotification
	 * @throws \InvalidArgumentException
	 */
	protected function parsePasswordRequest(INotification $notification, Room $room, IL10N $l): INotification {
		if ($notification->getObjectType() !== 'call') {
			throw new \InvalidArgumentException('Unknown object type');
		}

		try {
			$share = $this->shareManager->getShareByToken($room->getObjectId());
		} catch (ShareNotFound $e) {
			throw new \InvalidArgumentException('Unknown share');
		}

		$sharedWith = $share->getSharedWith();

		$notification
			->setParsedSubject(str_replace('{email}', $sharedWith, $l->t('{email} requested the password to access a share')))
			->setRichSubject(
				$l->t('{email} requested the password to access a share'), [
					'email' => [
						'type' => 'email',
						'id' => $sharedWith,
						'name' => $sharedWith,
					]
				]
			);

		return $notification;
	}
}
