import { ITokenHandler, Tokens } from './ITokenHandler'
import { Config } from '../config'
import { CoError } from '../co-error'
import { decode } from 'jsonwebtoken';

let TOKENS_KEY = 'tokens'

export class FileTokenHandler implements ITokenHandler{
  constructor () {}

  get(){
    return Config.get()
      .get(TOKENS_KEY)
      .then(tokens => {
        if(tokens){
          return tokens
        }

        throw new CoError('NOT_LOGGED_IN')
      })
  }

  set(data: Tokens){
    return Config.set({
      ewizard: {
        gatewayHost: getGatewayUrl(data.access_token)
      },
      [TOKENS_KEY]: filterData(data)
    })
  }

  clear(){
    return Config.reset([TOKENS_KEY])
  }
}

function filterData(data: Tokens): Tokens{
  return {
    access_token: data.access_token,
    refresh_token: data.refresh_token
  }
}

function getGatewayUrl(token: string): string {
  const data: any = decode(token);
  return data.apiUrl;
}