import fs from 'node:fs';
import type Stream from 'node:stream';

import type { IUploadDetails } from '@rocket.chat/apps-engine/definition/uploads/IUploadDetails';
import { api, ServiceClassInternal } from '@rocket.chat/core-services';
import type { ISendFileLivechatMessageParams, ISendFileMessageParams, IUploadFileParams, IUploadService } from '@rocket.chat/core-services';
import type { IUpload, IUser, FilesAndAttachments, IMessage, AtLeast } from '@rocket.chat/core-typings';
import { isFileAttachment } from '@rocket.chat/core-typings';
import { Logger } from '@rocket.chat/logger';
import { Uploads, Users } from '@rocket.chat/models';
import { Random } from '@rocket.chat/random';
import sharp from 'sharp';

import { NOTIFICATION_ATTACHMENT_COLOR } from '../../../lib/constants';
import { canAccessRoomIdAsync } from '../../lib/authorization/canAccessRoom';
import { canDeleteMessageAsync } from '../../lib/authorization/canDeleteMessage';
import { i18n } from '../../lib/i18n';
import { FileUpload } from '../../lib/media/file-upload';
import { updateMessage } from '../../lib/messages/updateMessage';
import { setUserAvatar } from '../../lib/users/setUserAvatar';
import { parseFileIntoMessageAttachments, sendFileMessage } from '../../meteor-methods/messages/sendFileMessage';
import { sendFileLivechatMessage } from '../../meteor-methods/omnichannel/sendFileLivechatMessage';
import { UploadFS } from '../../ufs';

const logger = new Logger('UploadService');

export class UploadService extends ServiceClassInternal implements IUploadService {
	protected name = 'upload';

	async uploadFile({ buffer, details, federation }: IUploadFileParams): Promise<IUpload> {
		const fileStore = FileUpload.getStore('Uploads');
		return fileStore.insert({ ...details, ...(federation && { federation }) }, buffer);
	}

	async sendFileMessage({ roomId, file, userId, message }: ISendFileMessageParams): Promise<boolean | undefined> {
		return sendFileMessage(userId, { roomId, file, msgData: message });
	}

	async sendFileLivechatMessage({ roomId, visitorToken, file, message }: ISendFileLivechatMessageParams): Promise<boolean> {
		return sendFileLivechatMessage({ roomId, visitorToken, file, msgData: message });
	}

	async getFileBuffer({ file }: { file: IUpload }): Promise<Buffer> {
		const buffer = await FileUpload.getBuffer(file);

		if (!(buffer instanceof Buffer)) {
			throw new Error('Unknown error');
		}
		return buffer;
	}

	async extractMetadata(file: IUpload): Promise<{ height?: number; width?: number; format?: string }> {
		return FileUpload.extractMetadata(file);
	}

	async parseFileIntoMessageAttachments(file: Partial<IUpload>, roomId: string, user: IUser): Promise<FilesAndAttachments> {
		return parseFileIntoMessageAttachments(file, roomId, user);
	}

	async canDeleteFile(
		user: Pick<IUser, '_id' | 'username'>,
		file: Pick<IUpload, '_id' | 'userId' | 'rid' | 'expiresAt' | 'uploadedAt'>,
		msg: IMessage | null,
	): Promise<boolean> {
		if (msg) {
			return canDeleteMessageAsync(user, msg);
		}

		if (!file.userId || !file.rid) {
			return false;
		}

		// If file is not confirmed and was sent by the same user
		if (file.expiresAt && file.userId === user._id) {
			return canAccessRoomIdAsync(file.rid, user._id);
		}

		// It's a confirmed file but it has no message, so use data from the file to run message delete permission checks
		const msgForValidation = { u: { _id: file.userId }, ts: file.uploadedAt, rid: file.rid };
		return canDeleteMessageAsync(user, msgForValidation);
	}

	async deleteFile(user: IUser, fileId: IUpload['_id'], msg: IMessage | null): Promise<{ deletedFiles: IUpload['_id'][] }> {
		// Find every file that is derived from the file that is being deleted (its thumbnails)
		const additionalFiles = await Uploads.findAllByOriginalFileId(fileId, { projection: { _id: 1 } })
			.map(({ _id }) => _id)
			.toArray();
		const allFiles = [fileId, ...additionalFiles];

		if (msg) {
			await this.updateMessageRemovingFiles(msg, allFiles, user);
		}

		return this.removeFileAndDerivates(fileId, additionalFiles);
	}

	private async removeFileAndDerivates(
		fileId: IUpload['_id'],
		additionalFiles: IUpload['_id'][],
	): Promise<{ deletedFiles: IUpload['_id'][] }> {
		const store = FileUpload.getStore('Uploads');
		// Delete the main file first;
		await store.deleteById(fileId);

		// The main file is already deleted; From here forward we'll return a success response even if some sub-process fails
		const deletedFiles: IUpload['_id'][] = [fileId];
		// Delete them one by one as the store may include requests to external services
		for await (const id of additionalFiles) {
			try {
				await store.deleteById(id);
				deletedFiles.push(id);
			} catch (err) {
				logger.error({ msg: 'Failed to delete derived file', fileId: id, originalFileId: fileId, err });
			}
		}

		return { deletedFiles };
	}

	private async updateMessageRemovingFiles(msg: IMessage, filesToRemove: IUpload['_id'][], user: IUser): Promise<void> {
		const text = `_${i18n.t('File_removed')}_`;
		const color = NOTIFICATION_ATTACHMENT_COLOR;

		const newFiles = msg.files?.filter((file) => !filesToRemove.includes(file._id));
		const newAttachments = msg.attachments?.map((attachment) => {
			if (!isFileAttachment(attachment)) {
				return attachment;
			}

			// If the attachment doesn't have a `fileId`, we assume it's an old message with only one file, in which case checking the id is not needed
			if (attachment.fileId && !filesToRemove.includes(attachment.fileId)) {
				return attachment;
			}

			return { type: 'removed-file', color, text, ...(attachment.fileId && { fileId: attachment.fileId }) };
		});
		const newFile = msg.file?._id && !filesToRemove.includes(msg.file._id) ? msg.file : newFiles?.[0];

		const editedMessage = {
			...msg,
			files: newFiles,
			attachments: newAttachments,
			file: newFile,
		};

		await updateMessage(editedMessage, user, msg);
	}

	async streamUploadedFile({
		file,
		imageResizeOpts,
	}: {
		file: IUpload;
		imageResizeOpts?: { width: number; height: number };
	}): Promise<Stream.Readable> {
		const stream = await FileUpload.getStore('Uploads')._store.getReadStream(file._id, file);
		if (!stream) {
			throw new Error('error-file-not-found');
		}

		if (file?.type?.includes('image') && imageResizeOpts) {
			const { width, height } = imageResizeOpts;

			const transformer = sharp().resize({ width, height, fit: 'contain' });

			stream.on('error', (err) => transformer.destroy(err));

			return stream.pipe(transformer);
		}

		return stream;
	}

	async uploadFileFromStream({
		streamParam,
		details,
	}: {
		streamParam: Stream.Readable;
		details: Omit<IUploadDetails, 'size'>;
	}): Promise<IUpload> {
		const resolver = Promise.withResolvers<IUpload>();

		const tempFilePath = UploadFS.getTempFilePath(Random.id());

		const writeStream = fs.createWriteStream(tempFilePath);
		streamParam.pipe(writeStream);

		const cleanup = (err: unknown) => {
			fs.promises.unlink(tempFilePath).catch(() => undefined);
			resolver.reject(err);
		};

		writeStream.on('finish', async () => {
			FileUpload.getStore('Uploads')
				.insert(
					{
						...details,
						size: writeStream.bytesWritten,
					},
					tempFilePath,
				)
				.then(resolver.resolve)
				.catch(cleanup);
		});

		streamParam.on('error', async (err) => {
			writeStream.destroy();
			cleanup(err);
		});

		writeStream.on('error', cleanup);

		return resolver.promise;
	}

	async setUserAvatar(user: Pick<IUser, '_id' | 'username'>, buffer: Buffer, contentType: string, service: 'rest'): Promise<void> {
		return setUserAvatar(user, buffer, contentType, service);
	}

	async resetUserAvatar(user: AtLeast<IUser, '_id' | 'username'>): Promise<void> {
		if (!user.username) {
			throw new Error('Username is required to reset avatar');
		}

		await FileUpload.getStore('Avatars').deleteByName(user.username);
		await Users.unsetAvatarData(user._id);
		void api.broadcast('user.avatarUpdate', { username: user.username, avatarETag: undefined });
	}
}