import type { Unit } from "@ledgerhq/types-cryptoassets";
import { getSeparators } from "./localeUtility";

const numbers = "0123456789";

export const sanitizeValueString = (
  unit: Unit,
  valueString: string,
  locale?: string,
): {
  display: string;
  value: string;
} => {
  const s = getSeparators(locale || "en-US");
  const dot = s.decimal || ".";
  let display = "";
  let value = "";
  let decimals = -1;

  for (let i = 0; i < valueString.length; i++) {
    const c = valueString[i];

    if (numbers.indexOf(c) !== -1) {
      if (decimals >= 0) {
        decimals++;
        if (decimals > unit.magnitude) break;
        value = value === "0" ? c : value + c;
        display += c;
      } else if (value !== "0") {
        value += c;
        display += c;
      } else {
        value = c;
        display = c;
      }
    } else if (decimals === -1 && (c === "," || c === ".")) {
      if (unit.magnitude === 0) {
        // in this specific case, we will never allow commas
        return {
          display,
          value,
        };
      }

      if (i === 0) display = "0";
      decimals = 0;
      display += dot;
    }
  }

  for (let i = Math.max(0, decimals); i < unit.magnitude; ++i) {
    value += "0";
  }

  if (!value) value = "0";
  return {
    display,
    value,
  };
};