import { EncryptionService } from "./EncryptionService";
import * as sjcl from "sjcl";
import { MessageCipherDTO } from "../dto/MessageCipherDTO";
import PromiseWorker from "promise-worker";
export class SJCLEncryptionService implements EncryptionService {
    private _params: sjcl.SjclCipherParams = { mode: "gcm", ts: 128, adata: "", iter: 10000 };
    private readonly _promiseWorker: PromiseWorker;

    constructor(promiseWorker: PromiseWorker) {
        this._promiseWorker = promiseWorker;
    }



    public encrypt(passphrase: string, plainText: string): MessageCipherDTO {
        const fn = () => {
            // @ts-ignore
            const cipher = sjcl.encrypt(passphrase, plainText, this._params)
            return cipher as unknown as string
        }
        return JSON.parse(fn())
    }

    public decrypt(passphrase: string, cipher: MessageCipherDTO): string {
        return sjcl.decrypt(passphrase, JSON.stringify(cipher));
    }

    public async decryptAsPromise(passphrase: string, cipher: MessageCipherDTO): Promise<string> {
        const decrypted = await this._promiseWorker.postMessage({ "passphrase": passphrase, "cipher": cipher })
        return decrypted;
    }
}