// need.js: +need but worse
//
// generally, pass the props object into these functions

import { BRIDGE_ERROR } from './error';

function web3(obj) {
  return 'web3' in obj === false
    ? (() => {
        throw BRIDGE_ERROR.MISSING_WEB3;
      })()
    : obj.web3.matchWith({
        Nothing: () => {
          throw BRIDGE_ERROR.MISSING_WEB3;
        },
        Just: w => w.value,
      });
}

function contracts(obj) {
  return 'contracts' in obj === false
    ? (() => {
        throw BRIDGE_ERROR.MISSING_CONTRACTS;
      })()
    : obj.contracts.matchWith({
        Nothing: () => {
          throw BRIDGE_ERROR.MISSING_CONTRACTS;
        },
        Just: c => c.value,
      });
}

function wallet(obj) {
  return 'wallet' in obj === false
    ? (() => {
        throw BRIDGE_ERROR.MISSING_WALLET;
      })()
    : obj.wallet.matchWith({
        Nothing: () => {
          throw BRIDGE_ERROR.MISSING_WALLET;
        },
        Just: w => w.value,
      });
}

function address(obj) {
  return wallet(obj).address;
}

function pointCursor(obj) {
  return 'pointCursor' in obj === false
    ? (() => {
        throw BRIDGE_ERROR.MISSING_POINT;
      })()
    : obj.pointCursor.matchWith({
        Nothing: () => {
          throw BRIDGE_ERROR.MISSING_POINT;
        },
        Just: p => p.value,
      });
}

function fromPointCache(obj, point) {
  return 'pointCache' in obj === false
    ? (() => {
        throw BRIDGE_ERROR.MISSING_POINT;
      })()
    : point in obj.pointCache
    ? obj.pointCache[point]
    : (() => {
        throw BRIDGE_ERROR.MISSING_POINT;
      })();
}

export { web3, contracts, wallet, address, pointCursor, fromPointCache };