import FilesRepository from "@Repositories/FilesRepository";
import BaseService from "@Services/BaseService";
import { Service } from "typedi";
import { File } from "le-coffre-resources/dist/SuperAdmin";
import CryptoService from "../CryptoService/CryptoService";
import IpfsService from "../IpfsService/IpfsService";
import { BackendVariables } from "@Common/config/variables/Variables";
import { Readable } from "stream";
import {v4}  from "uuid";
import { Files } from "@prisma/client";
import fetch from "node-fetch";


@Service()
export default class FilesService extends BaseService {
	constructor(
		private filesRepository: FilesRepository,
		private ipfsService: IpfsService,
		private variables: BackendVariables,
		private cryptoService: CryptoService,
	) {
		super();
	}

	/**
	 * @description : Get all files
	 * @throws {Error} If files cannot be ge
	 */
	public async get(query: any): Promise<Files[]>  {
		return this.filesRepository.findMany(query);
	}

	/**
	 * @description : Get a file by uid
	 * @throws {Error} If project cannot be created
	 */
	public async getByUid(uid: string): Promise<Files | null>  {
		return this.filesRepository.findOneByUid(uid);
	}

	/**
	 * @description : view a file
	 * @throws {Error} If file cannot be deleted
	 */
	public async download(uid: string) {
		const file = await this.filesRepository.findOneByUid(uid);
		if (!file?.key) return null;
		const fileResult = await fetch(file.file_path);
		const fileArrayBuffer = await fileResult.arrayBuffer();
		return {file: file, buffer: await this.cryptoService.decrypt(Buffer.from(fileArrayBuffer), file.key)};
	}

	/**
	 * @description : Create a new file
	 * @throws {Error} If file cannot be created
	 */
	public async create(file: File, fileData: Express.Multer.File) {
		const key = v4();		
		const encryptedFile = await this.cryptoService.encrypt(fileData.buffer, key);
		const upload = await this.ipfsService.pinFile(Readable.from(encryptedFile), fileData.originalname);
		const fileToCreate: File = file;
		fileToCreate.file_name = fileData.originalname;
		fileToCreate.file_path = this.variables.PINATA_GATEWAY.concat(upload.IpfsHash);
		fileToCreate.mimetype = fileData.mimetype;
		fileToCreate.size = fileData.size;

		return this.filesRepository.create(fileToCreate, key);
	}

	/**
	 * @description : Modify a new file
	 * @throws {Error} If file cannot be modified
	 */
	public async update(uid: string, file: File): Promise<Files> {
		return this.filesRepository.update(uid, file);
	}

	/**
	 * @description : Delete a file key and archive
	 * @throws {Error} If file key cannot be deleted or archived
	 */
	public async deleteKeyAndArchive(uid: string): Promise<Files> {
		try {
			const fileToUnpin = await this.filesRepository.findOneByUid(uid);
			if(!fileToUnpin) throw new Error("file not found");
			const fileHash = fileToUnpin.file_path.substring(this.variables.PINATA_GATEWAY.length);
			await this.ipfsService.unpinFile(fileHash);
		} catch(error) {
			console.error(error);
		}
		
		return this.filesRepository.deleteKeyAndArchive(uid);
	}
}