import { LogMetricTraceable, LogTraceable } from "@emprespresso/pengueno";
import { TraceUtil } from "../trace/util.ts";

const greetings = [
  "hewwo :D",
  "hiya cutie",
  "boop!",
  "sending virtual hugs!",
  "stay pawsitive",
];
const penguenoGreeting = () =>
  greetings[Math.floor(Math.random() * greetings.length)];

export class PenguenoRequest extends Request {
  private constructor(
    _input: URL,
    _requestInit: RequestInit,
    public readonly id: string,
    public readonly at: Date,
  ) {
    super(_input, _requestInit);
  }

  public baseResponseHeaders(): Record<string, string> {
    const ServerRequestTime = this.at.getTime();
    const ServerResponseTime = Date.now();
    const DeltaTime = ServerResponseTime - ServerRequestTime;
    const RequestId = this.id;

    return Object.entries({
      RequestId,
      ServerRequestTime,
      ServerResponseTime,
      DeltaTime,
      Hai: penguenoGreeting(),
    }).reduce((acc, [key, val]) => ({ ...acc, [key]: val.toString() }), {});
  }

  public static from(request: Request): LogMetricTraceable<PenguenoRequest> {
    const id = crypto.randomUUID();
    const url = new URL(request.url);
    const { pathname } = url;
    const logTraceable = LogTraceable.of(
      new PenguenoRequest(url, { ...request }, id, new Date()),
    ).bimap(
      TraceUtil.withTrace(`RequestId = ${id}, Method = ${request.method}, Path = ${pathname}`),
    );
    return LogMetricTraceable.ofLogTraceable(logTraceable);
  }
}