AugurProject/augur-ui

import { formatAttoRep } from "utils/format-number";
import { createBigNumber } from "utils/create-big-number";
import { augur } from "services/augurjs";

const ONE = createBigNumber(1);
const ONE_HUNDRED = createBigNumber(100);

// Percentages are ALWAYS in number range so results are returned as number
export const calculatePercentage = (numSize, numTotalStake) => {
  if (numSize === null || numTotalStake === null) return 0;
  if (typeof numSize === "undefined" || typeof numTotalStake === "undefined")
    return 0;

  // NB: Remove whence paramaters are converted outside
  const size = createBigNumber(numSize, 10);
  const totalStake = createBigNumber(numTotalStake, 10);
  // NB: Remove whence paramaters are converted outside

  if (size.isEqualTo(0)) return 0;
  if (size.lt(0) || totalStake.lt(0)) return 0;
  if (totalStake.isEqualTo(0)) return 0;

  const ratio = size.minus(totalStake).dividedBy(size);
  const value = ONE.minus(ratio)
    .times(ONE_HUNDRED)
    .toFixed(4, 1);
  return createBigNumber(value).toNumber();
};

export const calculateNonAccountPercentage = (
  size,
  numStakeCurrent,
  numAccountStakeCurrent
) => {
  // NB: Remove whence paramaters are converted outside
  const stakeCurrent = createBigNumber(numStakeCurrent, 10);
  const accountStakeCurrent = createBigNumber(numAccountStakeCurrent, 10);
  // NB: Remove whence paramaters are converted outside

  return calculatePercentage(size, stakeCurrent.minus(accountStakeCurrent));
};

export const calculateAddedStakePercentage = (
  size,
  numAccountStake,
  numAddedStake
) => {
  // NB: Remove whence paramaters are converted outside
  const accountStake = createBigNumber(numAccountStake, 10);
  const addedStake = createBigNumber(numAddedStake, 10);
  // NB: Remove whence paramaters are converted outside

  return calculatePercentage(size, accountStake.plus(addedStake));
};

export const calculateTentativeCurrentRep = (
  numTotalStake,
  numTentativeStake
) => {
  // NB: Remove whence paramaters are converted outside
  const totalStake = createBigNumber(numTotalStake, 10);
  const tentativeStake = createBigNumber(numTentativeStake, 10);
  // NB: Remove whence paramaters are converted outside

  const result = totalStake
    .plus(convertRepToAttoRep(tentativeStake))
    .toNumber();
  if (result < 0) return "0";

  return formatAttoRep(result, { decimals: 4, denomination: " REP" }).formatted;
};

const convertRepToAttoRep = num => {
  if (!num || num.isEqualTo(0)) return augur.constants.ZERO;
  return num.times(augur.rpc.constants.ETHER);
};