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class Group {
  /**
   * @param name {string}
   * @param bench {readonly Bench[]}
   * @param samples {number}
   */
  constructor(name, bench, samples = 10_000) {
    /**
     * @type {string}
     * @public
     */
    this.name = name;

    /**
     * @type {readonly Bench[]}
     * @public
     */
    this.bench = bench;

    /**
     * @type {number}
     * @public
     */
    this.samples = samples;
  }

  async run() {
    const { samples } = this;

    console.group(`${this.name} (n=${samples})`);

    for (const bench of this.bench) {
      const ds = [];

      for (let i = 0; i < samples; i++) {
        ds.push(await bench.run());
      }

      const ordered = ds.sort((a, b) => a - b);

      const total = ds.reduce((a, b) => a + b, 0);

      console.group(bench.name);
      console.log("total: ", total);
      console.log("avg: ", total / samples);
      console.log("p75: ", ordered[(ordered.length * 0.75) | 0]);
      console.log("p90: ", ordered[(ordered.length * 0.9) | 0]);
      console.groupEnd();
    }

    console.groupEnd();
  }
}

/**
 * @param name {string}
 * @param benches {readonly Bench[]}
 */
export function group(name, benches) {
  return new Group(name, benches);
}

class Bench {
  /**
   * @param name {string}
   * @param f {() => (void | Promise<void>)}
   */
  constructor(name, f) {
    /**
     * @type {string}
     * @public
     */
    this.name = name;

    /**
     * @type {() => (void | Promise<void>)}
     * @private
     */
    this.f = f;
  }

  /**
   * @returns {number | Promise<number>}
   */
  run() {
    const start = performance.now();

    const ret = this.f();
    if (ret instanceof Promise) {
      return ret.then(() => {
        return performance.now() - start;
      });
    }

    return performance.now() - start;
  }
}

/**
 * @param name {string}
 * @param f {() => (void | Promise<void>)}
 */
export function bench(name, f) {
  return new Bench(name, f);
}