import * as uuid from 'uuid/v4'
import { RPCParams, RPCPayload, RPCRequestMethod, TopicServiceName, TopicType } from '../types'
import { RPCInternalResponseTopic, RPCRequestTopic, RPCResponseTopic } from './topicBuilder'

export class RPCRequest {
  private _serviceName: TopicServiceName
  private _clientId: string
  private readonly _method: RPCRequestMethod
  private readonly _params: RPCParams
  private readonly _requestId: string
  private readonly _deviceId?: string

  constructor (
    clientId: string,
    serviceName: TopicServiceName,
    method: RPCRequestMethod,
    params: RPCParams,
    deviceId?: string
  ) {
    this._serviceName = serviceName
    this._clientId = clientId
    this._method = method
    this._params = params
    this._requestId = uuid()
    this._deviceId = deviceId
  }

  public get requestId (): string {
    return this._requestId
  }

  public get publishTopic (): string {
    return new RPCRequestTopic(this._serviceName, this._deviceId).topic
  }

  public get subscribeTopic (): string {
    return new RPCResponseTopic(this._clientId).topic
  }

  public get eventTopic (): string {
    return new RPCInternalResponseTopic(TopicType.RPC_RESPONSE, this.requestId).topic
  }

  public get payload (): RPCPayload {
    return {
      requestId: this.requestId,
      method: this._method,
      params: this._params,
    }
  }

}