import {Readable as ReadableStream} from 'node:stream';
import lowercaseKeys from 'lowercase-keys';

export default class Response extends ReadableStream {
	statusCode;
	headers;
	body;
	url;

	constructor({statusCode, headers, body, url}) {
		if (typeof statusCode !== 'number') {
			throw new TypeError('Argument `statusCode` should be a number');
		}

		if (typeof headers !== 'object') {
			throw new TypeError('Argument `headers` should be an object');
		}

		if (!(body instanceof Uint8Array)) {
			throw new TypeError('Argument `body` should be a buffer');
		}

		if (typeof url !== 'string') {
			throw new TypeError('Argument `url` should be a string');
		}

		super({
			read() {
				this.push(body);
				this.push(null);
			},
		});

		this.statusCode = statusCode;
		this.headers = lowercaseKeys(headers);
		this.body = body;
		this.url = url;
	}
}