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import { Response as DenoResponse, ServerRequest } from './deps.ts'
/** Encodes the url preventing double enconding */export function encodeUrl(url: string) {  return String(url)    .replace(UNMATCHED_SURROGATE_PAIR_REGEXP, UNMATCHED_SURROGATE_PAIR_REPLACE)    .replace(ENCODE_CHARS_REGEXP, encodeURI)}
const ENCODE_CHARS_REGEXP = /(?:[^\x21\x25\x26-\x3B\x3D\x3F-\x5B\x5D\x5F\x61-\x7A\x7E]|%(?:[^0-9A-Fa-f]|[0-9A-Fa-f][^0-9A-Fa-f]|$))+/g
const UNMATCHED_SURROGATE_PAIR_REGEXP = /(^|[^\uD800-\uDBFF])[\uDC00-\uDFFF]|[\uD800-\uDBFF]([^\uDC00-\uDFFF]|$)/g;
const UNMATCHED_SURROGATE_PAIR_REPLACE = "$1\uFFFD$2";
export const REDIRECT_BACK = Symbol("redirect backwards")
export interface IResponse extends DenoResponse {  error?: any  body: any  headers: Headers  finished: boolean  sent: boolean  sendResponse: () => Promise<boolean>  redirect: (    url: string | URL | typeof REDIRECT_BACK,    alt?: string | URL  ) => void  [key: string]: any}
/** * This class represents the response object from Mith framework */export class Response implements IResponse{  error?: any  body: any = {}  headers: Headers = new Headers()  finished: boolean = false  sent: boolean = false  status: number = 200  private request: ServerRequest
  constructor(req: ServerRequest) {    this.request = req  }
  /**   * Redirects the user to the chosen URL   * @param url string or url or symbol redirect backwards   * @param alt string or url to be used in case of unexisting "Referrer" when redirecting the user backwards    * @return void   */  redirect(url: string | URL | typeof REDIRECT_BACK, alt: string | URL = "/") {    if (url === REDIRECT_BACK) {      url = this.request.headers.get("Referrer") ?? String(alt);    } else if (typeof url === "object") {      url = String(url);    }    this.headers.set("Location", encodeUrl(url));        this.status = 302;        this.headers.set('Content-Type', 'text/plain; charset=utf-8')    this.body = this.body.length !== undefined && this.body.length !== 0 ? this.body : `Redirecting to ${url}.`  }
  /**   * Sends the response back to the caller   *   * @param request Deno Server Request Object   * @param response Mith Server Response Object   * @return void   */  public async sendResponse() {    let body = this.body    if (!this.sent) {      this.sent = true      if (typeof this.body === 'object') {        if (typeof body.read !== 'function') {          if (!this.headers.get('content-type')) {            this.headers.set('content-type', 'application/json')          }          body = JSON.stringify(this.body)        }      }      return this.request.respond({        status: this.status,        headers: this.headers,        body,      }).then(        () => {          return true        }      ).catch(        (e) => {          console.log(e)          return false        }      )    }    return false  }}