import * as ob from "urbit-ob";
import * as kg from "urbit-key-generation/dist/index";
import * as more from "more-entropy";
import lodash from "lodash";
import {
  MIN_STAR,
  MIN_PLANET,
  SEED_ENTROPY_BITS,
  GALAXY_ENTROPY_BITS,
  STAR_ENTROPY_BITS,
  PLANET_ENTROPY_BITS,
} from "./constants";

const SEED_LENGTH_BYTES = SEED_ENTROPY_BITS / 8;

// returns a promise for a ticket string
const makeTicket = point => {
  const bits =
    point < MIN_STAR
      ? GALAXY_ENTROPY_BITS
      : point < MIN_PLANET
      ? STAR_ENTROPY_BITS
      : PLANET_ENTROPY_BITS;

  const bytes = bits / 8;
  const some = new Uint8Array(bytes);
  window.crypto.getRandomValues(some);

  const gen = new more.Generator();

  return new Promise((resolve, reject) => {
    gen.generate(bits, result => {
      const chunked = lodash.chunk(result, 2);
      const desired = chunked.slice(0, bytes); // only take required entropy
      const more = lodash.flatMap(desired, arr => arr[0] ^ arr[1]);
      const entropy = lodash.zipWith(some, more, (x, y) => x ^ y);
      const buf = Buffer.from(entropy);
      const patq = ob.hex2patq(buf.toString("hex"));
      resolve(patq);
      reject("Entropy generation failed");
    });
  });
};

// return a wallet object
const generateWallet = async (point, ticket, boot) => {
  const config = {
    ticket: ticket,
    seedSize: SEED_LENGTH_BYTES,
    ship: point,
    password: "",
    revisions: {},
    boot: boot,
  };

  const wallet = await kg.generateWallet(config);

  // This is here to notify anyone who opens console because the thread
  // hangs, blocking UI updates so this cannot be done in the UI
  console.log("Generating Wallet for point address: ", point);

  return wallet;
};

// returns a promise
const generateOwnershipWallet = (ship, ticket) =>
  kg.generateOwnershipWallet({ ship, ticket });

const seq = num => Array.from(Array(num), (_, i) => i);

const compose = (...fs) =>
  fs.reduceRight((pF, nF) => (...args) => nF(pF(...args)), v => v);

export { makeTicket, generateWallet, generateOwnershipWallet, compose, seq };