// Copyright 2018-2026 the Deno authors. MIT license.

// deno-lint-ignore-file no-explicit-any no-var

/// <reference no-default-lib="true" />
/// <reference lib="esnext" />

/** @category Platform */
interface DomIterable<K, V> {
  keys(): IterableIterator<K>;
  values(): IterableIterator<V>;
  entries(): IterableIterator<[K, V]>;
  [Symbol.iterator](): IterableIterator<[K, V]>;
  forEach(
    callback: (value: V, key: K, parent: this) => void,
    thisArg?: any,
  ): void;
}

/** @category Fetch */
type FormDataEntryValue = File | string;

/** Provides a way to easily construct a set of key/value pairs representing
 * form fields and their values, which can then be easily sent using the
 * XMLHttpRequest.send() method. It uses the same format a form would use if the
 * encoding type were set to "multipart/form-data".
 *
 * @category Fetch
 */
interface FormData extends DomIterable<string, FormDataEntryValue> {
  append(name: string, value: string | Blob, fileName?: string): void;
  delete(name: string): void;
  get(name: string): FormDataEntryValue | null;
  getAll(name: string): FormDataEntryValue[];
  has(name: string): boolean;
  set(name: string, value: string | Blob, fileName?: string): void;
}

/** Provides a way to construct a set of key/value pairs representing form
 * fields and their values, which can then be sent using the {@linkcode fetch}
 * API. It uses the same format a form would use if the encoding type were set
 * to `"multipart/form-data"`.
 *
 * @see https://developer.mozilla.org/docs/Web/API/FormData
 *
 * @category Fetch
 */
declare var FormData: typeof globalThis extends
  { document: any; FormData: infer T } ? T : {
  readonly prototype: FormData;
  new (): FormData;
};

/** @category Fetch */
interface Body {
  /** A simple getter used to expose a `ReadableStream` of the body contents. */
  readonly body: ReadableStream<Uint8Array<ArrayBuffer>> | null;
  /** Stores a `Boolean` that declares whether the body has been used in a
   * response yet.
   */
  readonly bodyUsed: boolean;
  /** Takes a `Response` stream and reads it to completion. It returns a promise
   * that resolves with an `ArrayBuffer`.
   */
  arrayBuffer(): Promise<ArrayBuffer>;
  /** Takes a `Response` stream and reads it to completion. It returns a promise
   * that resolves with a `Blob`.
   */
  blob(): Promise<Blob>;
  /** Takes a `Response` stream and reads it to completion. It returns a promise
   * that resolves with a `Uint8Array`.
   */
  bytes(): Promise<Uint8Array<ArrayBuffer>>;
  /** Takes a `Response` stream and reads it to completion. It returns a promise
   * that resolves with a `FormData` object.
   */
  formData(): Promise<FormData>;
  /** Takes a `Response` stream and reads it to completion. It returns a promise
   * that resolves with the result of parsing the body text as JSON.
   */
  json(): Promise<any>;
  /** Takes a `Response` stream and reads it to completion. It returns a promise
   * that resolves with a `USVString` (text).
   */
  text(): Promise<string>;
  /** Takes a `Response` body stream and returns a `ReadableStream<string>`
   * that streams the body decoded as UTF-8 text. */
  textStream(): ReadableStream<string>;
}

/** @category Fetch */
type HeadersInit = Iterable<string[]> | Record<string, string>;

/** This Fetch API interface allows you to perform various actions on HTTP
 * request and response headers. These actions include retrieving, setting,
 * adding to, and removing. A Headers object has an associated header list,
 * which is initially empty and consists of zero or more name and value pairs.
 * You can add to this using methods like append() (see Examples). In all
 * methods of this interface, header names are matched by case-insensitive byte
 * sequence.
 *
 * @category Fetch
 */
interface Headers extends DomIterable<string, string> {
  /** Appends a new value onto an existing header inside a `Headers` object, or
   * adds the header if it does not already exist.
   */
  append(name: string, value: string): void;
  /** Deletes a header from a `Headers` object. */
  delete(name: string): void;
  /** Returns a `ByteString` sequence of all the values of a header within a
   * `Headers` object with a given name.
   */
  get(name: string): string | null;
  /** Returns a boolean stating whether a `Headers` object contains a certain
   * header.
   */
  has(name: string): boolean;
  /** Sets a new value for an existing header inside a Headers object, or adds
   * the header if it does not already exist.
   */
  set(name: string, value: string): void;
  /** Returns an array containing the values of all `Set-Cookie` headers
   * associated with a response.
   */
  getSetCookie(): string[];
}

/** This Fetch API interface allows you to perform various actions on HTTP
 * request and response headers. These actions include retrieving, setting,
 * adding to, and removing. A Headers object has an associated header list,
 * which is initially empty and consists of zero or more name and value pairs.
 * You can add to this using methods like append() (see Examples). In all
 * methods of this interface, header names are matched by case-insensitive byte
 * sequence.
 *
 * @category Fetch
 */
declare var Headers: typeof globalThis extends
  { document: any; Headers: infer T } ? T : {
  readonly prototype: Headers;
  new (init?: HeadersInit): Headers;
};

/** @category Fetch */
type RequestInfo = Request | string;
/** @category Fetch */
type RequestCache =
  | "default"
  | "force-cache"
  | "no-cache"
  | "no-store"
  | "only-if-cached"
  | "reload";
/** @category Fetch */
type RequestCredentials = "include" | "omit" | "same-origin";
/** @category Fetch */
type RequestMode = "cors" | "navigate" | "no-cors" | "same-origin";
/** @category Fetch */
type RequestRedirect = "error" | "follow" | "manual";
/** @category Fetch */
type RequestPriority = "auto" | "high" | "low";
/** @category Fetch */
type ReferrerPolicy =
  | ""
  | "no-referrer"
  | "no-referrer-when-downgrade"
  | "origin"
  | "origin-when-cross-origin"
  | "same-origin"
  | "strict-origin"
  | "strict-origin-when-cross-origin"
  | "unsafe-url";
/** @category Fetch */
type BodyInit =
  | Blob
  | BufferSource
  | FormData
  | URLSearchParams
  | ReadableStream<Uint8Array>
  | Iterable<Uint8Array>
  | AsyncIterable<Uint8Array>
  | string;
/** @category Fetch */
type RequestDestination =
  | ""
  | "audio"
  | "audioworklet"
  | "document"
  | "embed"
  | "font"
  | "image"
  | "manifest"
  | "object"
  | "paintworklet"
  | "report"
  | "script"
  | "sharedworker"
  | "style"
  | "track"
  | "video"
  | "worker"
  | "xslt";

/** @category Fetch */
interface RequestInit {
  /**
   * A BodyInit object or null to set request's body.
   */
  body?: BodyInit | null;
  /**
   * A string indicating how the request will interact with the browser's cache
   * to set request's cache.
   */
  cache?: RequestCache;
  /**
   * A string indicating whether credentials will be sent with the request
   * always, never, or only when sent to a same-origin URL. Sets request's
   * credentials.
   */
  credentials?: RequestCredentials;
  /**
   * A Headers object, an object literal, or an array of two-item arrays to set
   * request's headers.
   */
  headers?: HeadersInit;
  /**
   * A cryptographic hash of the resource to be fetched by request. Sets
   * request's integrity.
   */
  integrity?: string;
  /**
   * A boolean to set request's keepalive.
   */
  keepalive?: boolean;
  /**
   * A string to set request's method.
   */
  method?: string;
  /**
   * A string to indicate whether the request will use CORS, or will be
   * restricted to same-origin URLs. Sets request's mode.
   */
  mode?: RequestMode;
  /**
   * A string indicating the relative priority of the request. Sets request's
   * priority.
   */
  priority?: RequestPriority;
  /**
   * A string indicating whether request follows redirects, results in an error
   * upon encountering a redirect, or returns the redirect (in an opaque
   * fashion). Sets request's redirect.
   */
  redirect?: RequestRedirect;
  /**
   * A string whose value is a same-origin URL, "about:client", or the empty
   * string, to set request's referrer.
   */
  referrer?: string;
  /**
   * A referrer policy to set request's referrerPolicy.
   */
  referrerPolicy?: ReferrerPolicy;
  /**
   * An AbortSignal to set request's signal.
   */
  signal?: AbortSignal | null;
  /**
   * Can only be null. Used to disassociate request from any Window.
   */
  window?: any;
}

/** This Fetch API interface represents a resource request.
 *
 * @category Fetch
 */
interface Request extends Body {
  /**
   * Returns the cache mode associated with request, which is a string
   * indicating how the request will interact with the browser's cache when
   * fetching.
   */
  readonly cache: RequestCache;
  /**
   * Returns the credentials mode associated with request, which is a string
   * indicating whether credentials will be sent with the request always, never,
   * or only when sent to a same-origin URL.
   */
  readonly credentials: RequestCredentials;
  /**
   * Returns the kind of resource requested by request, e.g., "document" or "script".
   */
  readonly destination: RequestDestination;
  /**
   * Returns a Headers object consisting of the headers associated with request.
   * Note that headers added in the network layer by the user agent will not be
   * accounted for in this object, e.g., the "Host" header.
   */
  readonly headers: Headers;
  /**
   * Returns request's subresource integrity metadata, which is a cryptographic
   * hash of the resource being fetched. Its value consists of multiple hashes
   * separated by whitespace. [SRI]
   */
  readonly integrity: string;
  /**
   * Returns a boolean indicating whether or not request is for a history
   * navigation (a.k.a. back-forward navigation).
   */
  readonly isHistoryNavigation: boolean;
  /**
   * Returns a boolean indicating whether or not request is for a reload
   * navigation, e.g. a refresh triggered via the browser's reload control or
   * by calling location.reload().
   */
  readonly isReloadNavigation: boolean;
  /**
   * Returns a boolean indicating whether or not request can outlive the global
   * in which it was created.
   */
  readonly keepalive: boolean;
  /**
   * Returns request's HTTP method, which is "GET" by default.
   */
  readonly method: string;
  /**
   * Returns the mode associated with request, which is a string indicating
   * whether the request will use CORS, or will be restricted to same-origin
   * URLs.
   */
  readonly mode: RequestMode;
  /**
   * Returns the redirect mode associated with request, which is a string
   * indicating how redirects for the request will be handled during fetching. A
   * request will follow redirects by default.
   */
  readonly redirect: RequestRedirect;
  /**
   * Returns the referrer of request. Its value can be a same-origin URL if
   * explicitly set in init, the empty string to indicate no referrer, and
   * "about:client" when defaulting to the global's default. This is used during
   * fetching to determine the value of the `Referer` header of the request
   * being made.
   */
  readonly referrer: string;
  /**
   * Returns the referrer policy associated with request. This is used during
   * fetching to compute the value of the request's referrer.
   */
  readonly referrerPolicy: ReferrerPolicy;
  /**
   * Returns the signal associated with request, which is an AbortSignal object
   * indicating whether or not request has been aborted, and its abort event
   * handler.
   */
  readonly signal: AbortSignal;
  /**
   * Returns the URL of request as a string.
   */
  readonly url: string;
  clone(): Request;
}

/** This Fetch API interface represents a resource request.
 *
 * @category Fetch
 */
declare var Request: typeof globalThis extends
  { document: any; Request: infer T } ? T : {
  readonly prototype: Request;
  new (input: RequestInfo | URL, init?: RequestInit): Request;
};

/** @category Fetch */
interface ResponseInit {
  headers?: HeadersInit;
  status?: number;
  statusText?: string;
}

/** @category Fetch */
type ResponseType =
  | "basic"
  | "cors"
  | "default"
  | "error"
  | "opaque"
  | "opaqueredirect";

/** This Fetch API interface represents the response to a request.
 *
 * @category Fetch
 */
interface Response extends Body {
  readonly headers: Headers;
  readonly ok: boolean;
  readonly redirected: boolean;
  readonly status: number;
  readonly statusText: string;
  readonly type: ResponseType;
  readonly url: string;
  clone(): Response;
}

/** This Fetch API interface represents the response to a request.
 *
 * @category Fetch
 */
declare var Response: typeof globalThis extends
  { document: any; Response: infer T } ? T : {
  readonly prototype: Response;
  new (body?: BodyInit | null, init?: ResponseInit): Response;
  json(data: unknown, init?: ResponseInit): Response;
  error(): Response;
  redirect(url: string | URL, status?: number): Response;
};

/** Fetch a resource from the network. It returns a `Promise` that resolves to the
 * `Response` to that `Request`, whether it is successful or not.
 *
 * ```ts
 * const response = await fetch("http://my.json.host/data.json");
 * console.log(response.status);  // e.g. 200
 * console.log(response.statusText); // e.g. "OK"
 * const jsonData = await response.json();
 * ```
 *
 * @tags allow-net, allow-read
 * @category Fetch
 */
declare function fetch(
  input: RequestInfo | URL,
  init?: RequestInit,
): Promise<Response>;

/**
 * @category Fetch
 */
interface EventSourceInit {
  withCredentials?: boolean;
  headers?: HeadersInit;
}

/**
 * @category Fetch
 */
interface EventSourceEventMap {
  "error": Event;
  "message": MessageEvent;
  "open": Event;
}

/** Represents a connection to a server that sends
 * [server-sent events](https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events),
 * receiving updates pushed by the server as a stream of `message` events over a
 * persistent HTTP connection that automatically reconnects when interrupted.
 *
 * @category Fetch
 */
interface EventSource extends EventTarget {
  onerror: ((this: EventSource, ev: Event) => any) | null;
  onmessage: ((this: EventSource, ev: MessageEvent) => any) | null;
  onopen: ((this: EventSource, ev: Event) => any) | null;
  /**
   * Returns the state of this EventSource object's connection. It can have the values described below.
   */
  readonly readyState: number;
  /**
   * Returns the URL providing the event stream.
   */
  readonly url: string;
  /**
   * Returns true if the credentials mode for connection requests to the URL providing the event stream is set to "include", and false otherwise.
   */
  readonly withCredentials: boolean;
  /**
   * Aborts any instances of the fetch algorithm started for this EventSource object, and sets the readyState attribute to CLOSED.
   */
  close(): void;
  readonly CONNECTING: 0;
  readonly OPEN: 1;
  readonly CLOSED: 2;
  addEventListener<K extends keyof EventSourceEventMap>(
    type: K,
    listener: (this: EventSource, ev: EventSourceEventMap[K]) => any,
    options?: boolean | AddEventListenerOptions,
  ): void;
  addEventListener(
    type: string,
    listener: (this: EventSource, event: MessageEvent) => any,
    options?: boolean | AddEventListenerOptions,
  ): void;
  addEventListener(
    type: string,
    listener: EventListenerOrEventListenerObject,
    options?: boolean | AddEventListenerOptions,
  ): void;
  removeEventListener<K extends keyof EventSourceEventMap>(
    type: K,
    listener: (this: EventSource, ev: EventSourceEventMap[K]) => any,
    options?: boolean | EventListenerOptions,
  ): void;
  removeEventListener(
    type: string,
    listener: (this: EventSource, event: MessageEvent) => any,
    options?: boolean | EventListenerOptions,
  ): void;
  removeEventListener(
    type: string,
    listener: EventListenerOrEventListenerObject,
    options?: boolean | EventListenerOptions,
  ): void;
}

/** The `EventSource` interface is a web content's interface to server-sent
 * events. An `EventSource` instance opens a persistent connection to an HTTP
 * server, which sends events in `text/event-stream` format. The connection
 * remains open until closed by calling {@linkcode EventSource.close}.
 *
 * @see https://developer.mozilla.org/docs/Web/API/EventSource
 *
 * @category Fetch
 */
declare var EventSource: typeof globalThis extends
  { document: any; EventSource: infer T } ? T : {
  prototype: EventSource;
  new (url: string | URL, eventSourceInitDict?: EventSourceInit): EventSource;
  readonly CONNECTING: 0;
  readonly OPEN: 1;
  readonly CLOSED: 2;
};
