import * as _ from 'lodash';

// Utility function to create a K:V from a list of strings
// Adapted from: https://basarat.gitbooks.io/typescript/content/docs/types/literal-types.html
function strEnum(values: string[]): {[key: string]: string} {
    return _.reduce(values, (result, key) => {
        result[key] = key;
        return result;
    }, Object.create(null));
}

export const ZeroExError = strEnum([
  'CONTRACT_DOES_NOT_EXIST',
  'UNHANDLED_ERROR',
  'USER_HAS_NO_ASSOCIATED_ADDRESSES',
  'INVALID_SIGNATURE',
]);
export type ZeroExError = keyof typeof ZeroExError;

/**
 * Elliptic Curve signature
 */
export interface ECSignature {
    v: number;
    r: string;
    s: string;
}

export interface ExchangeContract {
    isValidSignature: any;
}

export const SolidityTypes = strEnum([
    'address',
    'uint256',
]);
export type SolidityTypes = keyof typeof SolidityTypes;