import { Cbor, CborByte } from ".";
import { AddressUtils } from "../address";
import { Multiasset } from "../assets";
import { CborInteger } from "./integer";
import { CborSet } from "./set";

const decode = (value: string, headerLength = 76) => {
  const address = CborByte.read(value.substring(headerLength));
  const utxoValue = value.substring(headerLength + 4 + address.length);
  const utxoValueType = Cbor.identifyType(utxoValue);

  if (utxoValueType === "array") {
    const coin = CborInteger.read(utxoValue.substring(2));
    const coinValue = utxoValue.substring(2);
    const coinLength = Cbor.readNextItemStringLength(coinValue);
    const multiassetValue = coinValue.substring(coinLength);

    return {
      address: AddressUtils.convertFromHexAddressToBech32(address),
      amount: {
        coin,
        multiasset: CborSet.read<Multiasset>(multiassetValue),
      },
    };
  } else if (utxoValueType === "integer" || utxoValueType === "unsigned") {
    return {
      address: AddressUtils.convertFromHexAddressToBech32(address),
      amount: {
        coin: CborInteger.read(utxoValue),
      },
    };
  } else {
    throw `Unknown utxo value`;
  }
};

export const CborUtxo = {
  decode,
};