// Forked from https://github.com/stardazed/sd-streams/tree/8928cf04b035fd02fb1340b7eb541c76be37e546
// Copyright (c) 2018-Present by Arthur Langereis - @zenmumbler MIT

/**
 * streams/readable-stream-byob-request - ReadableStreamBYOBRequest class implementation
 * Part of Stardazed
 * (c) 2018-Present by Arthur Langereis - @zenmumbler
 * https://github.com/stardazed/sd-streams
 */

import * as rs from "./readable-internals.ts";

export class ReadableStreamBYOBRequest {
  [rs.associatedReadableByteStreamController_]:
    | rs.SDReadableByteStreamController
    | undefined;
  [rs.view_]: ArrayBufferView | undefined;

  constructor() {
    throw new TypeError();
  }

  get view(): ArrayBufferView {
    if (!rs.isReadableStreamBYOBRequest(this)) {
      throw new TypeError();
    }
    return this[rs.view_]!;
  }

  respond(bytesWritten: number): void {
    if (!rs.isReadableStreamBYOBRequest(this)) {
      throw new TypeError();
    }
    if (this[rs.associatedReadableByteStreamController_] === undefined) {
      throw new TypeError();
    }
    // If! IsDetachedBuffer(this.[[view]].[[ViewedArrayBuffer]]) is true, throw a TypeError exception.
    return rs.readableByteStreamControllerRespond(
      this[rs.associatedReadableByteStreamController_]!,
      bytesWritten
    );
  }

  respondWithNewView(view: ArrayBufferView): void {
    if (!rs.isReadableStreamBYOBRequest(this)) {
      throw new TypeError();
    }
    if (this[rs.associatedReadableByteStreamController_] === undefined) {
      throw new TypeError();
    }
    if (!ArrayBuffer.isView(view)) {
      throw new TypeError("view parameter must be a TypedArray");
    }
    // If! IsDetachedBuffer(view.[[ViewedArrayBuffer]]) is true, throw a TypeError exception.
    return rs.readableByteStreamControllerRespondWithNewView(
      this[rs.associatedReadableByteStreamController_]!,
      view
    );
  }
}