import ob from 'urbit-ob';

import { ensurePatFormat } from 'form/formatters';

// looks into the GET parameters and attempts to construct a "flow" object,
// which would indicate bridge is to be used for one specific flow.
// expects to find any of the following sets of parameters, varying by kind.
//
// ? kind  = invite
// & as    = ~ship      // who to send the invite as
// & ship  = ~ship      // what planet to send as the invite
// & email = ex@amp.le  // email to send the invite code to
//

const COMMANDS = {
  INVITE: 'invite',
};

const useFlowCommand = () => {
  let flow = {};
  window.location.search
    .substr(1)
    .split('&')
    .forEach(arg => {
      if ('' === arg) return;
      const pam = arg.split('=');
      flow[pam[0]] = pam.length <= 1 ? true : decodeURIComponent(pam[1]);
    });

  if (typeof flow === 'object') {
    switch (flow.kind) {
      case COMMANDS.INVITE:
        flow.as = ensurePatFormat(flow.as);
        flow.ship = ensurePatFormat(flow.ship);
        if (!ob.isValidPatp(flow.as) || !ob.isValidPatp(flow.ship)) {
          console.log('invalid inviting flow arguments', flow.as, flow.ship);
          flow = null;
        }
        break;
      //
      default:
        console.log('unrecognized kind of flow:', flow.kind);
      // eslint-disable-next-line no-fallthrough
      case undefined:
        flow = null;
        break;
    }
  } else {
    flow = null;
  }

  return flow;
};

export { COMMANDS, useFlowCommand };