import Logger, { LoggerOptions } from '../util/logger';
import Defaults from '../util/defaults';
import Auth from './auth';
import { HttpPaginatedResponse, PaginatedResult } from './paginatedresource';
import ErrorInfo from '../types/errorinfo';
import Stats from '../types/stats';
import { Http, RequestParams } from '../../types/http';
import ClientOptions, { NormalisedClientOptions } from '../../types/ClientOptions';
import * as API from '../../../../ably';
import * as Utils from '../util/utils';

import Platform from '../../platform';
import { Rest } from './rest';
import { IUntypedCryptoStatic } from 'common/types/ICryptoStatic';
import { AnnotationsPlugin } from './modularplugins';
import { throwMissingPluginError } from '../util/utils';
import { MsgPack } from 'common/types/msgpack';
import { HTTPRequestImplementations } from 'platform/web/lib/http/http';
import { FilteredSubscriptions } from './filteredsubscriptions';
import type { LocalDevice } from 'plugins/push/pushactivation';
import EventEmitter from '../util/eventemitter';
import { MessageEncoding } from '../types/basemessage';

type BatchResult<T> = API.BatchResult<T>;
type BatchPublishSpec = API.BatchPublishSpec;
type BatchPublishSuccessResult = API.BatchPublishSuccessResult;
type BatchPublishFailureResult = API.BatchPublishFailureResult;
type BatchPublishResult = BatchResult<BatchPublishSuccessResult | BatchPublishFailureResult>;
type BatchPresenceSuccessResult = API.BatchPresenceSuccessResult;
type BatchPresenceFailureResult = API.BatchPresenceFailureResult;
type BatchPresenceResult = BatchResult<BatchPresenceSuccessResult | BatchPresenceFailureResult>;

/**
 `BaseClient` acts as the base class for all of the client classes exported by the SDK. It is an implementation detail and this class is not advertised publicly.
 */
class BaseClient {
  options: NormalisedClientOptions;
  _currentFallback: null | {
    host: string;
    validUntil: number;
  };
  serverTimeOffset: number | null;
  http: Http;
  auth: Auth;

  private readonly _rest: Rest | null;
  readonly _Crypto: IUntypedCryptoStatic | null;
  readonly _MsgPack: MsgPack | null;
  // Extra HTTP request implementations available to this client, in addition to those in web’s Http.bundledRequestImplementations
  readonly _additionalHTTPRequestImplementations: HTTPRequestImplementations | null;
  private readonly __FilteredSubscriptions: typeof FilteredSubscriptions | null;
  readonly _Annotations: AnnotationsPlugin | null;
  readonly logger: Logger;
  _device?: LocalDevice;

  constructor(options: ClientOptions) {
    this._additionalHTTPRequestImplementations = options.plugins ?? null;

    this.logger = new Logger();
    this.logger.setLog(options.logLevel, options.logHandler);
    Logger.logAction(
      this.logger,
      Logger.LOG_MICRO,
      'BaseClient()',
      'initialized with clientOptions ' + Platform.Config.inspect(options),
    );

    this._MsgPack = options.plugins?.MsgPack ?? null;
    const normalOptions = (this.options = Defaults.normaliseOptions(options, this._MsgPack, this.logger));

    /* process options */
    if (normalOptions.key) {
      const keyMatch = normalOptions.key.match(/^([^:\s]+):([^:.\s]+)$/);
      if (!keyMatch) {
        const msg = 'invalid key parameter';
        Logger.logAction(this.logger, Logger.LOG_ERROR, 'BaseClient()', msg);
        throw new ErrorInfo(msg, 40400, 404);
      }
      normalOptions.keyName = keyMatch[1];
      normalOptions.keySecret = keyMatch[2];
    }

    if ('clientId' in normalOptions) {
      if (!(typeof normalOptions.clientId === 'string' || normalOptions.clientId === null))
        throw new ErrorInfo('clientId must be either a string or null', 40012, 400);
      else if (normalOptions.clientId === '*')
        throw new ErrorInfo(
          'Can’t use "*" as a clientId as that string is reserved. (To change the default token request behaviour to use a wildcard clientId, use {defaultTokenParams: {clientId: "*"}})',
          40012,
          400,
        );
    }

    Logger.logAction(this.logger, Logger.LOG_MINOR, 'BaseClient()', 'started; version = ' + Defaults.version);

    this._currentFallback = null;

    this.serverTimeOffset = null;
    this.http = new Http(this);
    this.auth = new Auth(this, normalOptions);

    this._rest = options.plugins?.Rest ? new options.plugins.Rest(this) : null;
    this._Crypto = options.plugins?.Crypto ?? null;
    this.__FilteredSubscriptions = options.plugins?.MessageInteractions ?? null;
    this._Annotations = options.plugins?.Annotations ?? null;
  }

  get rest(): Rest {
    if (!this._rest) {
      throwMissingPluginError('Rest');
    }
    return this._rest;
  }

  get _FilteredSubscriptions(): typeof FilteredSubscriptions {
    if (!this.__FilteredSubscriptions) {
      throwMissingPluginError('MessageInteractions');
    }
    return this.__FilteredSubscriptions;
  }

  get channels() {
    return this.rest.channels;
  }

  get push() {
    return this.rest.push;
  }

  /** RSH8 */
  device(): LocalDevice & API.LocalDevice {
    if (!this.options.plugins?.Push || !this.push.LocalDevice) {
      throwMissingPluginError('Push');
    }
    if (!this._device) {
      this._device = this.push.LocalDevice.load(this);
    }
    return this._device;
  }

  baseUri(host: string) {
    return Defaults.getHttpScheme(this.options) + host + ':' + Defaults.getPort(this.options, false);
  }

  async stats(params: RequestParams): Promise<PaginatedResult<Stats>> {
    return this.rest.stats(params);
  }

  async time(params?: RequestParams): Promise<number> {
    return this.rest.time(params);
  }

  async request(
    method: string,
    path: string,
    version: number,
    params: RequestParams,
    body: unknown,
    customHeaders: Record<string, string>,
  ): Promise<HttpPaginatedResponse<unknown>> {
    return this.rest.request(method, path, version, params, body, customHeaders);
  }

  batchPublish<T extends BatchPublishSpec | BatchPublishSpec[]>(
    specOrSpecs: T,
  ): Promise<T extends BatchPublishSpec ? BatchPublishResult : BatchPublishResult[]> {
    return this.rest.batchPublish(specOrSpecs);
  }

  batchPresence(channels: string[]): Promise<BatchPresenceResult> {
    return this.rest.batchPresence(channels);
  }

  setLog(logOptions: LoggerOptions): void {
    this.logger.setLog(logOptions.level, logOptions.handler);
  }

  /**
   * Get the current time based on the local clock,
   * or if the option queryTime is true, return the server time.
   * The server time offset from the local time is stored so that
   * only one request to the server to get the time is ever needed
   */
  async getTimestamp(queryTime: boolean): Promise<number> {
    if (!this.isTimeOffsetSet() && queryTime) {
      return this.time();
    }

    return this.getTimestampUsingOffset();
  }

  getTimestampUsingOffset(): number {
    return Date.now() + (this.serverTimeOffset || 0);
  }

  isTimeOffsetSet(): boolean {
    return this.serverTimeOffset !== null;
  }

  static Platform = Platform;

  /**
   * These exports are for use by UMD plugins; reason being so that constructors and static methods can be accessed by these plugins without needing to import the classes directly and result in the class existing in both the plugin and the core library.
   */
  Platform = Platform;
  ErrorInfo = ErrorInfo;
  Logger = Logger;
  Defaults = Defaults;
  Utils = Utils;
  EventEmitter = EventEmitter;
  MessageEncoding = MessageEncoding;
}

export default BaseClient;