import type {
  Callable,
  IMetric,
  ITraceableMapper,
  ITraceableTuple,
  MetricsTraceSupplier,
} from "@emprespresso/pengueno";

export class TraceUtil {
  static withMetricTrace<T, Trace extends MetricsTraceSupplier>(
    metric: IMetric,
  ): ITraceableMapper<
    T,
    ITraceableTuple<T, Trace | Array<Trace>>,
    Trace
  > {
    return (t) => [t.get(), metric as Trace];
  }

  static withFunctionTrace<F extends Callable, T, Trace>(
    f: F,
  ): ITraceableMapper<
    T,
    ITraceableTuple<T, Trace | Array<Trace>>,
    Trace
  > {
    return (t) => [t.get(), `[${f.name}]`];
  }

  static withClassTrace<C extends object, T, Trace>(
    c: C,
  ): ITraceableMapper<
    T,
    ITraceableTuple<T, Trace | Array<Trace>>,
    Trace
  > {
    return (t) => [t.get(), `[${c.constructor.name}]`];
  }

  static promiseify<T, U, Trace>(
    mapper: ITraceableMapper<T, U, Trace>,
  ): ITraceableMapper<Promise<T>, Promise<U>, Trace> {
    return (traceablePromise) =>
      traceablePromise.flatMapAsync(async (t) =>
        t.move(await t.get()).map(mapper)
      ).get();
  }
}