// File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.

import type { RequestInit, RequestInfo, BodyInit } from './internal/builtin-types';
import type { HTTPMethod, PromiseOrValue, MergedRequestInit, FinalizedRequestInit } from './internal/types';
import { uuid4 } from './internal/utils/uuid';
import { validatePositiveInteger, isAbsoluteURL, safeJSON } from './internal/utils/values';
import { sleep } from './internal/utils/sleep';
export type { Logger, LogLevel } from './internal/utils/log';
import { castToError, isAbortError } from './internal/errors';
import type { APIResponseProps } from './internal/parse';
import { getPlatformHeaders } from './internal/detect-platform';
import * as Shims from './internal/shims';
import * as Opts from './internal/request-options';
import { stringifyQuery } from './internal/utils/query';
import { VERSION } from './version';
import * as Errors from './core/error';
import * as Uploads from './core/uploads';
import * as Webhooks from './lib/webhook_auth';
import * as API from './resources/index';
import { APIPromise } from './core/api-promise';
import {
  Agent,
  AgentCreateParams,
  AgentCreateVersionParams,
  AgentCreateVersionResponse,
  AgentDeleteVersionParams,
  AgentGetVersionsResponse,
  AgentListParams,
  AgentListResponse,
  AgentListVersionsParams,
  AgentListVersionsResponse,
  AgentPublishParams,
  AgentResponse,
  AgentRetrieveParams,
  AgentUpdateParams,
} from './resources/agent';
import {
  App,
  AppCreateParams,
  AppDeleteParams,
  AppListParams,
  AppListResponse,
  AppListUsagesParams,
  AppListUsagesResponse,
  AppResponse,
  AppTestAuthResponse,
  AppUpdateParams,
} from './resources/app';
import { BatchCall, BatchCallCreateBatchCallParams, BatchCallResponse } from './resources/batch-call';
import {
  Call,
  CallCreatePhoneCallParams,
  CallCreateWebCallParams,
  CallListParams,
  CallListResponse,
  CallRegisterPhoneCallParams,
  CallResponse,
  CallUpdateLiveParams,
  CallUpdateLiveResponse,
  CallUpdateParams,
  PhoneCallResponse,
  WebCallResponse,
} from './resources/call';
import {
  Chat,
  ChatCreateChatCompletionParams,
  ChatCreateChatCompletionResponse,
  ChatCreateParams,
  ChatCreateSMSChatParams,
  ChatListParams,
  ChatListResponse,
  ChatResponse,
  ChatUpdateParams,
} from './resources/chat';
import {
  ChatAgent,
  ChatAgentCreateParams,
  ChatAgentCreateVersionParams,
  ChatAgentCreateVersionResponse,
  ChatAgentDeleteVersionParams,
  ChatAgentGetVersionsResponse,
  ChatAgentListParams,
  ChatAgentListResponse,
  ChatAgentPublishParams,
  ChatAgentResponse,
  ChatAgentRetrieveParams,
  ChatAgentUpdateParams,
} from './resources/chat-agent';
import { Concurrency, ConcurrencyRetrieveResponse } from './resources/concurrency';
import {
  Contact,
  ContactBackfillAnalysisDataParams,
  ContactBackfillAnalysisDataResponse,
  ContactCreateParams,
  ContactGetBackfillJobStatusResponse,
  ContactListConversationsParams,
  ContactListConversationsResponse,
  ContactListParams,
  ContactListResponse,
  ContactResponse,
  ContactUpdateParams,
} from './resources/contact';
import {
  ConversationFlow,
  ConversationFlowCreateParams,
  ConversationFlowDeleteParams,
  ConversationFlowListParams,
  ConversationFlowListResponse,
  ConversationFlowResponse,
  ConversationFlowRetrieveParams,
  ConversationFlowUpdateParams,
} from './resources/conversation-flow';
import {
  ConversationFlowComponent,
  ConversationFlowComponentCreateParams,
  ConversationFlowComponentListParams,
  ConversationFlowComponentListResponse,
  ConversationFlowComponentResponse,
  ConversationFlowComponentUpdateParams,
} from './resources/conversation-flow-component';
import {
  CRM,
  CRMConfig,
  CRMGetSchemaParams,
  CRMGetSchemaResponse,
  CRMGetSyncJobStatusResponse,
  CRMRunSyncJobResponse,
  CRMUpdateConfigParams,
} from './resources/crm';
import {
  ExportRequest,
  ExportRequestListParams,
  ExportRequestListResponse,
} from './resources/export-request';
import { Identity, IdentityRetrieveResponse } from './resources/identity';
import {
  KnowledgeBase,
  KnowledgeBaseAddSourcesParams,
  KnowledgeBaseCreateParams,
  KnowledgeBaseDeleteSourceParams,
  KnowledgeBaseListResponse,
  KnowledgeBaseResponse,
} from './resources/knowledge-base';
import {
  Llm,
  LlmCreateParams,
  LlmDeleteParams,
  LlmListParams,
  LlmListResponse,
  LlmResponse,
  LlmRetrieveParams,
  LlmUpdateParams,
} from './resources/llm';
import {
  McpTool,
  McpToolDefinition,
  McpToolGetMcpToolsParams,
  McpToolGetMcpToolsResponse,
} from './resources/mcp-tool';
import {
  PhoneNumber,
  PhoneNumberCreateParams,
  PhoneNumberImportParams,
  PhoneNumberListParams,
  PhoneNumberListResponse,
  PhoneNumberResponse,
  PhoneNumberUpdateParams,
} from './resources/phone-number';
import { Playground, PlaygroundCompletionParams, PlaygroundCompletionResponse } from './resources/playground';
import {
  BatchTestResponse,
  TestCaseDefinitionResponse,
  TestCaseJobResponse,
  TestCreateBatchTestParams,
  TestCreateTestCaseDefinitionParams,
  TestListBatchTestsParams,
  TestListBatchTestsResponse,
  TestListTestCaseDefinitionsParams,
  TestListTestCaseDefinitionsResponse,
  TestListTestRunsParams,
  TestListTestRunsResponse,
  TestUpdateTestCaseDefinitionParams,
  Tests,
} from './resources/tests';
import {
  Voice,
  VoiceAddResourceParams,
  VoiceCloneParams,
  VoiceListResponse,
  VoiceResponse,
  VoiceSearchParams,
  VoiceSearchResponse,
} from './resources/voice';
import { type Fetch } from './internal/builtin-types';
import { HeadersLike, NullableHeaders, buildHeaders } from './internal/headers';
import { FinalRequestOptions, RequestOptions } from './internal/request-options';
import { readEnv } from './internal/utils/env';
import {
  type LogLevel,
  type Logger,
  formatRequestDetails,
  loggerFor,
  parseLogLevel,
} from './internal/utils/log';
import { isEmptyObj } from './internal/utils/values';

export interface ClientOptions {
  /**
   * Defaults to process.env['RETELL_API_KEY'].
   */
  apiKey?: string | undefined;

  /**
   * Override the default base URL for the API, e.g., "https://api.example.com/v2/"
   *
   * Defaults to process.env['RETELL_BASE_URL'].
   */
  baseURL?: string | null | undefined;

  /**
   * The maximum amount of time (in milliseconds) that the client should wait for a response
   * from the server before timing out a single request.
   *
   * Note that request timeouts are retried by default, so in a worst-case scenario you may wait
   * much longer than this timeout before the promise succeeds or fails.
   *
   * @unit milliseconds
   */
  timeout?: number | undefined;
  /**
   * Additional `RequestInit` options to be passed to `fetch` calls.
   * Properties will be overridden by per-request `fetchOptions`.
   */
  fetchOptions?: MergedRequestInit | undefined;

  /**
   * Specify a custom `fetch` function implementation.
   *
   * If not provided, we expect that `fetch` is defined globally.
   */
  fetch?: Fetch | undefined;

  /**
   * The maximum number of times that the client will retry a request in case of a
   * temporary failure, like a network error or a 5XX error from the server.
   *
   * @default 2
   */
  maxRetries?: number | undefined;

  /**
   * Default headers to include with every request to the API.
   *
   * These can be removed in individual requests by explicitly setting the
   * header to `null` in request options.
   */
  defaultHeaders?: HeadersLike | undefined;

  /**
   * Default query parameters to include with every request to the API.
   *
   * These can be removed in individual requests by explicitly setting the
   * param to `undefined` in request options.
   */
  defaultQuery?: Record<string, string | undefined> | undefined;

  /**
   * Set the log level.
   *
   * Defaults to process.env['RETELL_LOG'] or 'warn' if it isn't set.
   */
  logLevel?: LogLevel | undefined;

  /**
   * Set the logger.
   *
   * Defaults to globalThis.console.
   */
  logger?: Logger | undefined;
}

/**
 * API Client for interfacing with the Retell API.
 */
export class Retell {
  apiKey: string;

  baseURL: string;
  maxRetries: number;
  timeout: number;
  logger: Logger;
  logLevel: LogLevel | undefined;
  fetchOptions: MergedRequestInit | undefined;

  private fetch: Fetch;
  #encoder: Opts.RequestEncoder;
  protected idempotencyHeader?: string;
  private _options: ClientOptions;

  /**
   * API Client for interfacing with the Retell API.
   *
   * @param {string | undefined} [opts.apiKey=process.env['RETELL_API_KEY'] ?? undefined]
   * @param {string} [opts.baseURL=process.env['RETELL_BASE_URL'] ?? https://api.retellai.com] - Override the default base URL for the API.
   * @param {number} [opts.timeout=1 minute] - The maximum amount of time (in milliseconds) the client will wait for a response before timing out.
   * @param {MergedRequestInit} [opts.fetchOptions] - Additional `RequestInit` options to be passed to `fetch` calls.
   * @param {Fetch} [opts.fetch] - Specify a custom `fetch` function implementation.
   * @param {number} [opts.maxRetries=2] - The maximum number of times the client will retry a request.
   * @param {HeadersLike} opts.defaultHeaders - Default headers to include with every request to the API.
   * @param {Record<string, string | undefined>} opts.defaultQuery - Default query parameters to include with every request to the API.
   */
  constructor({
    baseURL = readEnv('RETELL_BASE_URL'),
    apiKey = readEnv('RETELL_API_KEY'),
    ...opts
  }: ClientOptions = {}) {
    if (apiKey === undefined) {
      throw new Errors.RetellError(
        "The RETELL_API_KEY environment variable is missing or empty; either provide it, or instantiate the Retell client with an apiKey option, like new Retell({ apiKey: 'YOUR_RETELL_API_KEY' }).",
      );
    }

    const options: ClientOptions = {
      apiKey,
      ...opts,
      baseURL: baseURL || `https://api.retellai.com`,
    };

    this.baseURL = options.baseURL!;
    this.timeout = options.timeout ?? Retell.DEFAULT_TIMEOUT /* 1 minute */;
    this.logger = options.logger ?? console;
    const defaultLogLevel = 'warn';
    // Set default logLevel early so that we can log a warning in parseLogLevel.
    this.logLevel = defaultLogLevel;
    this.logLevel =
      parseLogLevel(options.logLevel, 'ClientOptions.logLevel', this) ??
      parseLogLevel(readEnv('RETELL_LOG'), "process.env['RETELL_LOG']", this) ??
      defaultLogLevel;
    this.fetchOptions = options.fetchOptions;
    this.maxRetries = options.maxRetries ?? 2;
    this.fetch = options.fetch ?? Shims.getDefaultFetch();
    this.#encoder = Opts.FallbackEncoder;

    const customHeadersEnv = readEnv('RETELL_CUSTOM_HEADERS');
    if (customHeadersEnv) {
      const parsed: Record<string, string> = {};
      for (const line of customHeadersEnv.split('\n')) {
        const colon = line.indexOf(':');
        if (colon >= 0) {
          parsed[line.substring(0, colon).trim()] = line.substring(colon + 1).trim();
        }
      }
      options.defaultHeaders = { ...parsed, ...options.defaultHeaders };
    }

    this._options = options;

    this.apiKey = apiKey;
  }

  /**
   * Create a new client instance re-using the same options given to the current client with optional overriding.
   */
  withOptions(options: Partial<ClientOptions>): this {
    const client = new (this.constructor as any as new (props: ClientOptions) => typeof this)({
      ...this._options,
      baseURL: this.baseURL,
      maxRetries: this.maxRetries,
      timeout: this.timeout,
      logger: this.logger,
      logLevel: this.logLevel,
      fetch: this.fetch,
      fetchOptions: this.fetchOptions,
      apiKey: this.apiKey,
      ...options,
    });
    return client;
  }

  /**
   * Check whether the base URL is set to its default.
   */
  #baseURLOverridden(): boolean {
    return this.baseURL !== 'https://api.retellai.com';
  }

  protected defaultQuery(): Record<string, string | undefined> | undefined {
    return this._options.defaultQuery;
  }

  protected validateHeaders({ values, nulls }: NullableHeaders) {
    return;
  }

  protected async authHeaders(opts: FinalRequestOptions): Promise<NullableHeaders | undefined> {
    return buildHeaders([{ Authorization: `Bearer ${this.apiKey}` }]);
  }

  /**
   * Basic re-implementation of `qs.stringify` for primitive types.
   */
  protected stringifyQuery(query: object | Record<string, unknown>): string {
    return stringifyQuery(query);
  }

  private getUserAgent(): string {
    return `${this.constructor.name}/JS ${VERSION}`;
  }

  protected defaultIdempotencyKey(): string {
    return `stainless-node-retry-${uuid4()}`;
  }

  protected makeStatusError(
    status: number,
    error: Object,
    message: string | undefined,
    headers: Headers,
  ): Errors.APIError {
    return Errors.APIError.generate(status, error, message, headers);
  }

  buildURL(
    path: string,
    query: Record<string, unknown> | null | undefined,
    defaultBaseURL?: string | undefined,
  ): string {
    const baseURL = (!this.#baseURLOverridden() && defaultBaseURL) || this.baseURL;
    const url =
      isAbsoluteURL(path) ?
        new URL(path)
      : new URL(baseURL + (baseURL.endsWith('/') && path.startsWith('/') ? path.slice(1) : path));

    const defaultQuery = this.defaultQuery();
    const pathQuery = Object.fromEntries(url.searchParams);
    if (!isEmptyObj(defaultQuery) || !isEmptyObj(pathQuery)) {
      query = { ...pathQuery, ...defaultQuery, ...query };
    }

    if (typeof query === 'object' && query && !Array.isArray(query)) {
      url.search = this.stringifyQuery(query);
    }

    return url.toString();
  }

  /**
   * Used as a callback for mutating the given `FinalRequestOptions` object.
   */
  protected async prepareOptions(options: FinalRequestOptions): Promise<void> {}

  /**
   * Used as a callback for mutating the given `RequestInit` object.
   *
   * This is useful for cases where you want to add certain headers based off of
   * the request properties, e.g. `method` or `url`.
   */
  protected async prepareRequest(
    request: RequestInit,
    { url, options }: { url: string; options: FinalRequestOptions },
  ): Promise<void> {}

  get<Rsp>(path: string, opts?: PromiseOrValue<RequestOptions>): APIPromise<Rsp> {
    return this.methodRequest('get', path, opts);
  }

  post<Rsp>(path: string, opts?: PromiseOrValue<RequestOptions>): APIPromise<Rsp> {
    return this.methodRequest('post', path, opts);
  }

  patch<Rsp>(path: string, opts?: PromiseOrValue<RequestOptions>): APIPromise<Rsp> {
    return this.methodRequest('patch', path, opts);
  }

  put<Rsp>(path: string, opts?: PromiseOrValue<RequestOptions>): APIPromise<Rsp> {
    return this.methodRequest('put', path, opts);
  }

  delete<Rsp>(path: string, opts?: PromiseOrValue<RequestOptions>): APIPromise<Rsp> {
    return this.methodRequest('delete', path, opts);
  }

  private methodRequest<Rsp>(
    method: HTTPMethod,
    path: string,
    opts?: PromiseOrValue<RequestOptions>,
  ): APIPromise<Rsp> {
    return this.request(
      Promise.resolve(opts).then((opts) => {
        return { method, path, ...opts };
      }),
    );
  }

  request<Rsp>(
    options: PromiseOrValue<FinalRequestOptions>,
    remainingRetries: number | null = null,
  ): APIPromise<Rsp> {
    return new APIPromise(this, this.makeRequest(options, remainingRetries, undefined));
  }

  private async makeRequest(
    optionsInput: PromiseOrValue<FinalRequestOptions>,
    retriesRemaining: number | null,
    retryOfRequestLogID: string | undefined,
  ): Promise<APIResponseProps> {
    const options = await optionsInput;
    const maxRetries = options.maxRetries ?? this.maxRetries;
    if (retriesRemaining == null) {
      retriesRemaining = maxRetries;
    }

    await this.prepareOptions(options);

    const { req, url, timeout } = await this.buildRequest(options, {
      retryCount: maxRetries - retriesRemaining,
    });

    await this.prepareRequest(req, { url, options });

    /** Not an API request ID, just for correlating local log entries. */
    const requestLogID = 'log_' + ((Math.random() * (1 << 24)) | 0).toString(16).padStart(6, '0');
    const retryLogStr = retryOfRequestLogID === undefined ? '' : `, retryOf: ${retryOfRequestLogID}`;
    const startTime = Date.now();

    loggerFor(this).debug(
      `[${requestLogID}] sending request`,
      formatRequestDetails({
        retryOfRequestLogID,
        method: options.method,
        url,
        options,
        headers: req.headers,
      }),
    );

    if (options.signal?.aborted) {
      throw new Errors.APIUserAbortError();
    }

    const controller = new AbortController();
    const response = await this.fetchWithTimeout(url, req, timeout, controller).catch(castToError);
    const headersTime = Date.now();

    if (response instanceof globalThis.Error) {
      const retryMessage = `retrying, ${retriesRemaining} attempts remaining`;
      if (options.signal?.aborted) {
        throw new Errors.APIUserAbortError();
      }
      // detect native connection timeout errors
      // deno throws "TypeError: error sending request for url (https://example/): client error (Connect): tcp connect error: Operation timed out (os error 60): Operation timed out (os error 60)"
      // undici throws "TypeError: fetch failed" with cause "ConnectTimeoutError: Connect Timeout Error (attempted address: example:443, timeout: 1ms)"
      // others do not provide enough information to distinguish timeouts from other connection errors
      const isTimeout =
        isAbortError(response) ||
        /timed? ?out/i.test(String(response) + ('cause' in response ? String(response.cause) : ''));
      if (retriesRemaining) {
        loggerFor(this).info(
          `[${requestLogID}] connection ${isTimeout ? 'timed out' : 'failed'} - ${retryMessage}`,
        );
        loggerFor(this).debug(
          `[${requestLogID}] connection ${isTimeout ? 'timed out' : 'failed'} (${retryMessage})`,
          formatRequestDetails({
            retryOfRequestLogID,
            url,
            durationMs: headersTime - startTime,
            message: response.message,
          }),
        );
        return this.retryRequest(options, retriesRemaining, retryOfRequestLogID ?? requestLogID);
      }
      loggerFor(this).info(
        `[${requestLogID}] connection ${isTimeout ? 'timed out' : 'failed'} - error; no more retries left`,
      );
      loggerFor(this).debug(
        `[${requestLogID}] connection ${isTimeout ? 'timed out' : 'failed'} (error; no more retries left)`,
        formatRequestDetails({
          retryOfRequestLogID,
          url,
          durationMs: headersTime - startTime,
          message: response.message,
        }),
      );
      if (isTimeout) {
        throw new Errors.APIConnectionTimeoutError();
      }
      throw new Errors.APIConnectionError({ cause: response });
    }

    const responseInfo = `[${requestLogID}${retryLogStr}] ${req.method} ${url} ${
      response.ok ? 'succeeded' : 'failed'
    } with status ${response.status} in ${headersTime - startTime}ms`;

    if (!response.ok) {
      const shouldRetry = await this.shouldRetry(response);
      if (retriesRemaining && shouldRetry) {
        const retryMessage = `retrying, ${retriesRemaining} attempts remaining`;

        // We don't need the body of this response.
        await Shims.CancelReadableStream(response.body);
        loggerFor(this).info(`${responseInfo} - ${retryMessage}`);
        loggerFor(this).debug(
          `[${requestLogID}] response error (${retryMessage})`,
          formatRequestDetails({
            retryOfRequestLogID,
            url: response.url,
            status: response.status,
            headers: response.headers,
            durationMs: headersTime - startTime,
          }),
        );
        return this.retryRequest(
          options,
          retriesRemaining,
          retryOfRequestLogID ?? requestLogID,
          response.headers,
        );
      }

      const retryMessage = shouldRetry ? `error; no more retries left` : `error; not retryable`;

      loggerFor(this).info(`${responseInfo} - ${retryMessage}`);

      const errText = await response.text().catch((err: any) => castToError(err).message);
      const errJSON = safeJSON(errText) as any;
      const errMessage = errJSON ? undefined : errText;

      loggerFor(this).debug(
        `[${requestLogID}] response error (${retryMessage})`,
        formatRequestDetails({
          retryOfRequestLogID,
          url: response.url,
          status: response.status,
          headers: response.headers,
          message: errMessage,
          durationMs: Date.now() - startTime,
        }),
      );

      const err = this.makeStatusError(response.status, errJSON, errMessage, response.headers);
      throw err;
    }

    loggerFor(this).info(responseInfo);
    loggerFor(this).debug(
      `[${requestLogID}] response start`,
      formatRequestDetails({
        retryOfRequestLogID,
        url: response.url,
        status: response.status,
        headers: response.headers,
        durationMs: headersTime - startTime,
      }),
    );

    return { response, options, controller, requestLogID, retryOfRequestLogID, startTime };
  }

  async fetchWithTimeout(
    url: RequestInfo,
    init: RequestInit | undefined,
    ms: number,
    controller: AbortController,
  ): Promise<Response> {
    const { signal, method, ...options } = init || {};
    const abort = this._makeAbort(controller);
    if (signal) signal.addEventListener('abort', abort, { once: true });

    const timeout = setTimeout(abort, ms);

    const isReadableBody =
      ((globalThis as any).ReadableStream && options.body instanceof (globalThis as any).ReadableStream) ||
      (typeof options.body === 'object' && options.body !== null && Symbol.asyncIterator in options.body);

    const fetchOptions: RequestInit = {
      signal: controller.signal as any,
      ...(isReadableBody ? { duplex: 'half' } : {}),
      method: 'GET',
      ...options,
    };
    if (method) {
      // Custom methods like 'patch' need to be uppercased
      // See https://github.com/nodejs/undici/issues/2294
      fetchOptions.method = method.toUpperCase();
    }

    try {
      // use undefined this binding; fetch errors if bound to something else in browser/cloudflare
      return await this.fetch.call(undefined, url, fetchOptions);
    } finally {
      clearTimeout(timeout);
    }
  }

  private async shouldRetry(response: Response): Promise<boolean> {
    // Note this is not a standard header.
    const shouldRetryHeader = response.headers.get('x-should-retry');

    // If the server explicitly says whether or not to retry, obey.
    if (shouldRetryHeader === 'true') return true;
    if (shouldRetryHeader === 'false') return false;

    // Retry on request timeouts.
    if (response.status === 408) return true;

    // Retry on lock timeouts.
    if (response.status === 409) return true;

    // Retry on rate limits.
    if (response.status === 429) return true;

    // Retry internal errors.
    if (response.status >= 500) return true;

    return false;
  }

  private async retryRequest(
    options: FinalRequestOptions,
    retriesRemaining: number,
    requestLogID: string,
    responseHeaders?: Headers | undefined,
  ): Promise<APIResponseProps> {
    let timeoutMillis: number | undefined;

    // Note the `retry-after-ms` header may not be standard, but is a good idea and we'd like proactive support for it.
    const retryAfterMillisHeader = responseHeaders?.get('retry-after-ms');
    if (retryAfterMillisHeader) {
      const timeoutMs = parseFloat(retryAfterMillisHeader);
      if (!Number.isNaN(timeoutMs)) {
        timeoutMillis = timeoutMs;
      }
    }

    // About the Retry-After header: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Retry-After
    const retryAfterHeader = responseHeaders?.get('retry-after');
    if (retryAfterHeader && !timeoutMillis) {
      const timeoutSeconds = parseFloat(retryAfterHeader);
      if (!Number.isNaN(timeoutSeconds)) {
        timeoutMillis = timeoutSeconds * 1000;
      } else {
        timeoutMillis = Date.parse(retryAfterHeader) - Date.now();
      }
    }

    // If the API asks us to wait a certain amount of time, just do what it
    // says, but otherwise calculate a default
    if (timeoutMillis === undefined) {
      const maxRetries = options.maxRetries ?? this.maxRetries;
      timeoutMillis = this.calculateDefaultRetryTimeoutMillis(retriesRemaining, maxRetries);
    }
    await sleep(timeoutMillis);

    return this.makeRequest(options, retriesRemaining - 1, requestLogID);
  }

  private calculateDefaultRetryTimeoutMillis(retriesRemaining: number, maxRetries: number): number {
    const initialRetryDelay = 0.5;
    const maxRetryDelay = 8.0;

    const numRetries = maxRetries - retriesRemaining;

    // Apply exponential backoff, but not more than the max.
    const sleepSeconds = Math.min(initialRetryDelay * Math.pow(2, numRetries), maxRetryDelay);

    // Apply some jitter, take up to at most 25 percent of the retry time.
    const jitter = 1 - Math.random() * 0.25;

    return sleepSeconds * jitter * 1000;
  }

  async buildRequest(
    inputOptions: FinalRequestOptions,
    { retryCount = 0 }: { retryCount?: number } = {},
  ): Promise<{ req: FinalizedRequestInit; url: string; timeout: number }> {
    const options = { ...inputOptions };
    const { method, path, query, defaultBaseURL } = options;

    const url = this.buildURL(path!, query as Record<string, unknown>, defaultBaseURL);
    if ('timeout' in options) validatePositiveInteger('timeout', options.timeout);
    options.timeout = options.timeout ?? this.timeout;
    const { bodyHeaders, body } = this.buildBody({ options });
    const reqHeaders = await this.buildHeaders({ options: inputOptions, method, bodyHeaders, retryCount });

    const req: FinalizedRequestInit = {
      method,
      headers: reqHeaders,
      ...(options.signal && { signal: options.signal }),
      ...((globalThis as any).ReadableStream &&
        body instanceof (globalThis as any).ReadableStream && { duplex: 'half' }),
      ...(body && { body }),
      ...((this.fetchOptions as any) ?? {}),
      ...((options.fetchOptions as any) ?? {}),
    };

    return { req, url, timeout: options.timeout };
  }

  private async buildHeaders({
    options,
    method,
    bodyHeaders,
    retryCount,
  }: {
    options: FinalRequestOptions;
    method: HTTPMethod;
    bodyHeaders: HeadersLike;
    retryCount: number;
  }): Promise<Headers> {
    let idempotencyHeaders: HeadersLike = {};
    if (this.idempotencyHeader && method !== 'get') {
      if (!options.idempotencyKey) options.idempotencyKey = this.defaultIdempotencyKey();
      idempotencyHeaders[this.idempotencyHeader] = options.idempotencyKey;
    }

    const headers = buildHeaders([
      idempotencyHeaders,
      {
        Accept: 'application/json',
        'User-Agent': this.getUserAgent(),
        'X-Stainless-Retry-Count': String(retryCount),
        ...(options.timeout ? { 'X-Stainless-Timeout': String(Math.trunc(options.timeout / 1000)) } : {}),
        ...getPlatformHeaders(),
      },
      await this.authHeaders(options),
      this._options.defaultHeaders,
      bodyHeaders,
      options.headers,
    ]);

    this.validateHeaders(headers);

    return headers.values;
  }

  private _makeAbort(controller: AbortController) {
    // note: we can't just inline this method inside `fetchWithTimeout()` because then the closure
    //       would capture all request options, and cause a memory leak.
    return () => controller.abort();
  }

  private buildBody({ options }: { options: FinalRequestOptions }): {
    bodyHeaders: HeadersLike;
    body: BodyInit | undefined;
  } {
    const { body, headers: rawHeaders } = options;
    if (!body) {
      // A resource method always passes a `body` key when its operation defines a
      // request body, even if the caller omitted an optional body param. Keep the
      // content-type for those, and only elide it for operations with no body at
      // all (e.g. GET/DELETE).
      if (body == null && 'body' in options) {
        return this.#encoder({ body, headers: buildHeaders([rawHeaders]) });
      }
      return { bodyHeaders: undefined, body: undefined };
    }
    const headers = buildHeaders([rawHeaders]);
    if (
      // Pass raw type verbatim
      ArrayBuffer.isView(body) ||
      body instanceof ArrayBuffer ||
      body instanceof DataView ||
      (typeof body === 'string' &&
        // Preserve legacy string encoding behavior for now
        headers.values.has('content-type')) ||
      // `Blob` is superset of `File`
      ((globalThis as any).Blob && body instanceof (globalThis as any).Blob) ||
      // `FormData` -> `multipart/form-data`
      body instanceof FormData ||
      // `URLSearchParams` -> `application/x-www-form-urlencoded`
      body instanceof URLSearchParams ||
      // Send chunked stream (each chunk has own `length`)
      ((globalThis as any).ReadableStream && body instanceof (globalThis as any).ReadableStream)
    ) {
      return { bodyHeaders: undefined, body: body as BodyInit };
    } else if (
      typeof body === 'object' &&
      (Symbol.asyncIterator in body ||
        (Symbol.iterator in body && 'next' in body && typeof body.next === 'function'))
    ) {
      return { bodyHeaders: undefined, body: Shims.ReadableStreamFrom(body as AsyncIterable<Uint8Array>) };
    } else if (
      typeof body === 'object' &&
      headers.values.get('content-type') === 'application/x-www-form-urlencoded'
    ) {
      return {
        bodyHeaders: { 'content-type': 'application/x-www-form-urlencoded' },
        body: this.stringifyQuery(body),
      };
    } else {
      return this.#encoder({ body, headers });
    }
  }

  static Retell = this;
  static DEFAULT_TIMEOUT = 60000; // 1 minute

  static RetellError = Errors.RetellError;
  static APIError = Errors.APIError;
  static APIConnectionError = Errors.APIConnectionError;
  static APIConnectionTimeoutError = Errors.APIConnectionTimeoutError;
  static APIUserAbortError = Errors.APIUserAbortError;
  static NotFoundError = Errors.NotFoundError;
  static ConflictError = Errors.ConflictError;
  static RateLimitError = Errors.RateLimitError;
  static BadRequestError = Errors.BadRequestError;
  static AuthenticationError = Errors.AuthenticationError;
  static InternalServerError = Errors.InternalServerError;
  static PermissionDeniedError = Errors.PermissionDeniedError;
  static UnprocessableEntityError = Errors.UnprocessableEntityError;

  static toFile = Uploads.toFile;
  static verify = Webhooks.verify;
  static sign = Webhooks.sign;

  call: API.Call = new API.Call(this);
  chat: API.Chat = new API.Chat(this);
  phoneNumber: API.PhoneNumber = new API.PhoneNumber(this);
  agent: API.Agent = new API.Agent(this);
  chatAgent: API.ChatAgent = new API.ChatAgent(this);
  llm: API.Llm = new API.Llm(this);
  conversationFlow: API.ConversationFlow = new API.ConversationFlow(this);
  conversationFlowComponent: API.ConversationFlowComponent = new API.ConversationFlowComponent(this);
  knowledgeBase: API.KnowledgeBase = new API.KnowledgeBase(this);
  voice: API.Voice = new API.Voice(this);
  concurrency: API.Concurrency = new API.Concurrency(this);
  identity: API.Identity = new API.Identity(this);
  exportRequest: API.ExportRequest = new API.ExportRequest(this);
  batchCall: API.BatchCall = new API.BatchCall(this);
  tests: API.Tests = new API.Tests(this);
  playground: API.Playground = new API.Playground(this);
  mcpTool: API.McpTool = new API.McpTool(this);
  contact: API.Contact = new API.Contact(this);
  app: API.App = new API.App(this);
  crm: API.CRM = new API.CRM(this);
}

Retell.Call = Call;
Retell.Chat = Chat;
Retell.PhoneNumber = PhoneNumber;
Retell.Agent = Agent;
Retell.ChatAgent = ChatAgent;
Retell.Llm = Llm;
Retell.ConversationFlow = ConversationFlow;
Retell.ConversationFlowComponent = ConversationFlowComponent;
Retell.KnowledgeBase = KnowledgeBase;
Retell.Voice = Voice;
Retell.Concurrency = Concurrency;
Retell.Identity = Identity;
Retell.ExportRequest = ExportRequest;
Retell.BatchCall = BatchCall;
Retell.Tests = Tests;
Retell.Playground = Playground;
Retell.McpTool = McpTool;
Retell.Contact = Contact;
Retell.App = App;
Retell.CRM = CRM;

export declare namespace Retell {
  export type RequestOptions = Opts.RequestOptions;

  export {
    Call as Call,
    type CallResponse as CallResponse,
    type PhoneCallResponse as PhoneCallResponse,
    type WebCallResponse as WebCallResponse,
    type CallListResponse as CallListResponse,
    type CallUpdateLiveResponse as CallUpdateLiveResponse,
    type CallUpdateParams as CallUpdateParams,
    type CallListParams as CallListParams,
    type CallCreatePhoneCallParams as CallCreatePhoneCallParams,
    type CallCreateWebCallParams as CallCreateWebCallParams,
    type CallRegisterPhoneCallParams as CallRegisterPhoneCallParams,
    type CallUpdateLiveParams as CallUpdateLiveParams,
  };

  export {
    Chat as Chat,
    type ChatResponse as ChatResponse,
    type ChatListResponse as ChatListResponse,
    type ChatCreateChatCompletionResponse as ChatCreateChatCompletionResponse,
    type ChatCreateParams as ChatCreateParams,
    type ChatUpdateParams as ChatUpdateParams,
    type ChatListParams as ChatListParams,
    type ChatCreateChatCompletionParams as ChatCreateChatCompletionParams,
    type ChatCreateSMSChatParams as ChatCreateSMSChatParams,
  };

  export {
    PhoneNumber as PhoneNumber,
    type PhoneNumberResponse as PhoneNumberResponse,
    type PhoneNumberListResponse as PhoneNumberListResponse,
    type PhoneNumberCreateParams as PhoneNumberCreateParams,
    type PhoneNumberUpdateParams as PhoneNumberUpdateParams,
    type PhoneNumberListParams as PhoneNumberListParams,
    type PhoneNumberImportParams as PhoneNumberImportParams,
  };

  export {
    Agent as Agent,
    type AgentResponse as AgentResponse,
    type AgentListResponse as AgentListResponse,
    type AgentCreateVersionResponse as AgentCreateVersionResponse,
    type AgentGetVersionsResponse as AgentGetVersionsResponse,
    type AgentListVersionsResponse as AgentListVersionsResponse,
    type AgentCreateParams as AgentCreateParams,
    type AgentRetrieveParams as AgentRetrieveParams,
    type AgentUpdateParams as AgentUpdateParams,
    type AgentListParams as AgentListParams,
    type AgentCreateVersionParams as AgentCreateVersionParams,
    type AgentDeleteVersionParams as AgentDeleteVersionParams,
    type AgentListVersionsParams as AgentListVersionsParams,
    type AgentPublishParams as AgentPublishParams,
  };

  export {
    ChatAgent as ChatAgent,
    type ChatAgentResponse as ChatAgentResponse,
    type ChatAgentListResponse as ChatAgentListResponse,
    type ChatAgentCreateVersionResponse as ChatAgentCreateVersionResponse,
    type ChatAgentGetVersionsResponse as ChatAgentGetVersionsResponse,
    type ChatAgentCreateParams as ChatAgentCreateParams,
    type ChatAgentRetrieveParams as ChatAgentRetrieveParams,
    type ChatAgentUpdateParams as ChatAgentUpdateParams,
    type ChatAgentListParams as ChatAgentListParams,
    type ChatAgentCreateVersionParams as ChatAgentCreateVersionParams,
    type ChatAgentDeleteVersionParams as ChatAgentDeleteVersionParams,
    type ChatAgentPublishParams as ChatAgentPublishParams,
  };

  export {
    Llm as Llm,
    type LlmResponse as LlmResponse,
    type LlmListResponse as LlmListResponse,
    type LlmCreateParams as LlmCreateParams,
    type LlmRetrieveParams as LlmRetrieveParams,
    type LlmUpdateParams as LlmUpdateParams,
    type LlmListParams as LlmListParams,
    type LlmDeleteParams as LlmDeleteParams,
  };

  export {
    ConversationFlow as ConversationFlow,
    type ConversationFlowResponse as ConversationFlowResponse,
    type ConversationFlowListResponse as ConversationFlowListResponse,
    type ConversationFlowCreateParams as ConversationFlowCreateParams,
    type ConversationFlowRetrieveParams as ConversationFlowRetrieveParams,
    type ConversationFlowUpdateParams as ConversationFlowUpdateParams,
    type ConversationFlowListParams as ConversationFlowListParams,
    type ConversationFlowDeleteParams as ConversationFlowDeleteParams,
  };

  export {
    ConversationFlowComponent as ConversationFlowComponent,
    type ConversationFlowComponentResponse as ConversationFlowComponentResponse,
    type ConversationFlowComponentListResponse as ConversationFlowComponentListResponse,
    type ConversationFlowComponentCreateParams as ConversationFlowComponentCreateParams,
    type ConversationFlowComponentUpdateParams as ConversationFlowComponentUpdateParams,
    type ConversationFlowComponentListParams as ConversationFlowComponentListParams,
  };

  export {
    KnowledgeBase as KnowledgeBase,
    type KnowledgeBaseResponse as KnowledgeBaseResponse,
    type KnowledgeBaseListResponse as KnowledgeBaseListResponse,
    type KnowledgeBaseCreateParams as KnowledgeBaseCreateParams,
    type KnowledgeBaseAddSourcesParams as KnowledgeBaseAddSourcesParams,
    type KnowledgeBaseDeleteSourceParams as KnowledgeBaseDeleteSourceParams,
  };

  export {
    Voice as Voice,
    type VoiceResponse as VoiceResponse,
    type VoiceListResponse as VoiceListResponse,
    type VoiceSearchResponse as VoiceSearchResponse,
    type VoiceAddResourceParams as VoiceAddResourceParams,
    type VoiceCloneParams as VoiceCloneParams,
    type VoiceSearchParams as VoiceSearchParams,
  };

  export { Concurrency as Concurrency, type ConcurrencyRetrieveResponse as ConcurrencyRetrieveResponse };

  export { Identity as Identity, type IdentityRetrieveResponse as IdentityRetrieveResponse };

  export {
    ExportRequest as ExportRequest,
    type ExportRequestListResponse as ExportRequestListResponse,
    type ExportRequestListParams as ExportRequestListParams,
  };

  export {
    BatchCall as BatchCall,
    type BatchCallResponse as BatchCallResponse,
    type BatchCallCreateBatchCallParams as BatchCallCreateBatchCallParams,
  };

  export {
    Tests as Tests,
    type BatchTestResponse as BatchTestResponse,
    type TestCaseDefinitionResponse as TestCaseDefinitionResponse,
    type TestCaseJobResponse as TestCaseJobResponse,
    type TestListBatchTestsResponse as TestListBatchTestsResponse,
    type TestListTestCaseDefinitionsResponse as TestListTestCaseDefinitionsResponse,
    type TestListTestRunsResponse as TestListTestRunsResponse,
    type TestCreateBatchTestParams as TestCreateBatchTestParams,
    type TestCreateTestCaseDefinitionParams as TestCreateTestCaseDefinitionParams,
    type TestListBatchTestsParams as TestListBatchTestsParams,
    type TestListTestCaseDefinitionsParams as TestListTestCaseDefinitionsParams,
    type TestListTestRunsParams as TestListTestRunsParams,
    type TestUpdateTestCaseDefinitionParams as TestUpdateTestCaseDefinitionParams,
  };

  export {
    Playground as Playground,
    type PlaygroundCompletionResponse as PlaygroundCompletionResponse,
    type PlaygroundCompletionParams as PlaygroundCompletionParams,
  };

  export {
    McpTool as McpTool,
    type McpToolDefinition as McpToolDefinition,
    type McpToolGetMcpToolsResponse as McpToolGetMcpToolsResponse,
    type McpToolGetMcpToolsParams as McpToolGetMcpToolsParams,
  };

  export {
    Contact as Contact,
    type ContactResponse as ContactResponse,
    type ContactListResponse as ContactListResponse,
    type ContactBackfillAnalysisDataResponse as ContactBackfillAnalysisDataResponse,
    type ContactGetBackfillJobStatusResponse as ContactGetBackfillJobStatusResponse,
    type ContactListConversationsResponse as ContactListConversationsResponse,
    type ContactCreateParams as ContactCreateParams,
    type ContactUpdateParams as ContactUpdateParams,
    type ContactListParams as ContactListParams,
    type ContactBackfillAnalysisDataParams as ContactBackfillAnalysisDataParams,
    type ContactListConversationsParams as ContactListConversationsParams,
  };

  export {
    App as App,
    type AppResponse as AppResponse,
    type AppListResponse as AppListResponse,
    type AppListUsagesResponse as AppListUsagesResponse,
    type AppTestAuthResponse as AppTestAuthResponse,
    type AppCreateParams as AppCreateParams,
    type AppUpdateParams as AppUpdateParams,
    type AppListParams as AppListParams,
    type AppDeleteParams as AppDeleteParams,
    type AppListUsagesParams as AppListUsagesParams,
  };

  export {
    CRM as CRM,
    type CRMConfig as CRMConfig,
    type CRMGetSchemaResponse as CRMGetSchemaResponse,
    type CRMGetSyncJobStatusResponse as CRMGetSyncJobStatusResponse,
    type CRMRunSyncJobResponse as CRMRunSyncJobResponse,
    type CRMGetSchemaParams as CRMGetSchemaParams,
    type CRMUpdateConfigParams as CRMUpdateConfigParams,
  };
}