import {
	BadRequestException,
	Injectable,
	NotImplementedException,
	StreamableFile,
	UnauthorizedException
} from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { INode, User } from 'entities';
import { Repository } from 'typeorm';
import { Multipart } from '@fastify/multipart';
import { pipeline } from 'stream/promises';
import { createReadStream, createWriteStream, statSync, unlink } from 'fs';
import { Writable } from 'stream';

@Injectable()
export default class FileSystemService {
	constructor(
		@InjectRepository(INode)
		private inodeRepo: Repository<INode>
	) {}

	async downloadFile(id: number, user: User): Promise<StreamableFile> {
		const node = await this.getNodeAndValidate(id, user);
		if (!node.isFile) throw new NotImplementedException();
		const stats = statSync(`files/${node.id}`);
		return new StreamableFile(createReadStream(`files/${node.id}`), {
			disposition: `attachment; filename="${node.name}"`,
			length: stats.size
		});
	}
}