import type { HydrogenDailyRow } from '../types';

export {
  formatYmd,
  getQuickRange,
  getRangeModeLabel,
  normalizeRange,
  QUICK_PICK_OPTIONS,
  type RangeMode,
} from '../daily-range/model';

export function summarizeHydrogenRows(rows: HydrogenDailyRow[] | null) {
  const source = rows ?? [];
  // 图表固定按日期升序；复制数组避免改变接口返回及表格原始顺序。
  const trendData = [...source].sort((left, right) => left.date.localeCompare(right.date));
  const totalKg = source.reduce((total, row) => total + row.totalKg, 0);
  const activeDays = source.filter(row => row.totalKg > 0).length;
  const stationNames = new Set<string>();
  source.forEach(row => row.stations.forEach(station => stationNames.add(station.name)));
  const peakDay = trendData.reduce<HydrogenDailyRow | null>(
    (best, item) => (!best || item.totalKg > best.totalKg ? item : best),
    null,
  );
  const lowDay = trendData
    .filter(item => item.totalKg > 0)
    .reduce<HydrogenDailyRow | null>(
      (low, item) => (!low || item.totalKg < low.totalKg ? item : low),
      null,
    );

  return {
    trendData,
    totalKg,
    activeDays,
    stationCount: stationNames.size,
    avgKg: activeDays > 0 ? totalKg / activeDays : 0,
    peakDay,
    lowDay,
    zeroDays: source.filter(row => row.totalKg === 0).length,
  };
}