import dayjs from 'dayjs'

/** Gleiche Logik wie History.jsx für rollierende Mittel */
export function rollingAvg(arr, key, window = 7) {
  return arr.map((d, i) => {
    const s = arr
      .slice(Math.max(0, i - window + 1), i + 1)
      .map((x) => x[key])
      .filter((v) => v != null)
    return s.length
      ? { ...d, [`${key}_avg`]: Math.round((s.reduce((a, b) => a + b, 0) / s.length) * 10) / 10 }
      : d
  })
}

export const fmtDate = (d) => dayjs(d).format('DD.MM')