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import { CorsOptions, CorsOptionsDelegate } from "./types.ts";import { Cors } from "./cors.ts";
interface Req {  method: string;  headers: {    get(headerKey: string): string | null | undefined;  };}
interface Res {  status: (status: number) => any;  headers: {    get(headerKey: string): string | null | undefined;    set(headerKey: string, headerValue: string): any;  };  send: (body: any) => any;}
export const attainCors = <  RequestT extends Req = any,  ResponseT extends Res = any,  MiddlewareT extends (    request: RequestT, response: ResponseT  ) => any = any>(  o?: CorsOptions | CorsOptionsDelegate<RequestT>,) => {  const corsOptionsDelegate = Cors.produceCorsOptionsDelegate<    CorsOptionsDelegate<RequestT>  >(o);
  return async function cors(request, response) {    try {      const fakeNext = () => undefined;      const options = await corsOptionsDelegate(request);
      const corsOptions = Cors.produceCorsOptions(options || {});      const originDelegate = Cors.produceOriginDelegate(corsOptions);
      if (originDelegate) {        const requestMethod = request.method;        const getRequestHeader = (headerKey: string) =>          request.headers.get(headerKey);        const getResponseHeader = (headerKey: string) =>          response.headers.get(headerKey);        const setResponseHeader = (headerKey: string, headerValue: string) =>          response.headers.set(headerKey, headerValue);        const setStatus = (statusCode: number) =>          response.status(statusCode)
        const origin = await originDelegate(getRequestHeader("origin"));
        if (origin) {          corsOptions.origin = origin;
          new Cors({            corsOptions,            requestMethod,            getRequestHeader,            getResponseHeader,            setResponseHeader,            setStatus,            next: fakeNext,          }).configureHeaders();        }      }
      if(request.method === "OPTIONS") {        response.send("");      }
    } catch (error) {      throw error    }  } as MiddlewareT;};