/**
 * @license
 * Copyright 2020 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { ControlParams, EventParams, CustomParams } from './public-types';

/**
 * Encapsulates metadata concerning throttled fetch requests.
 */
export interface ThrottleMetadata {
  // The number of times fetch has backed off. Used for resuming backoff after a timeout.
  backoffCount: number;
  // The Unix timestamp in milliseconds when callers can retry a request.
  throttleEndTimeMillis: number;
}

/**
 * Dynamic configuration fetched from server.
 * See https://firebase.google.com/docs/projects/api/reference/rest/v1beta1/projects.webApps/getConfig
 */
export interface DynamicConfig {
  projectId: string;
  appId: string;
  databaseURL: string;
  storageBucket: string;
  locationId: string;
  apiKey: string;
  authDomain: string;
  messagingSenderId: string;
  measurementId: string;
}

export interface MinimalDynamicConfig {
  appId: string;
  measurementId: string;
}

/**
 * Standard `gtag` function provided by gtag.js.
 */
export interface Gtag {
  (
    command: 'config',
    targetId: string,
    config?: ControlParams | EventParams | CustomParams
  ): void;
  (command: 'set', config: CustomParams): void;
  (
    command: 'event',
    eventName: string,
    eventParams?: ControlParams | EventParams | CustomParams
  ): void;
}

export type DataLayer = IArguments[];