import { JSONRPCRequest } from '../base-provider';
import Subprovider, { CompletionHandler, NextHandler } from '../subprovider';

export default class FixtureProvider extends Subprovider {
  protected staticResponses: any;

  constructor(staticResponses) {
    super();
    this.staticResponses = staticResponses || {};
  }

  public handleRequest(payload: JSONRPCRequest, next: NextHandler, end: CompletionHandler): void {
    const staticResponse = this.staticResponses[payload.method];
    // async function
    if ('function' === typeof staticResponse) {
      staticResponse(payload, next, end);
    // static response - null is valid response
    } else if (staticResponse !== undefined) {
      // return result asynchronously
      setTimeout(() => end(null, staticResponse));
    // no prepared response - skip
    } else {
      next();
    }
  }
}