import type { GarminConnect } from "garmin-connect";

export type DayWellness = {
  date: string;
  sleepDurationMin?: number;
  sleepScore?: number;
  deepSleepMin?: number;
  remSleepMin?: number;
  avgOvernightHrv?: number;
  hrvStatus?: string;
  restingHr?: number;
  bodyBatteryChange?: number;
};

export async function fetchRecentWellness(
  client: GarminConnect,
  days: number
): Promise<DayWellness[]> {
  const today = new Date();

  const dates = Array.from({ length: days }, (_, i) => {
    const d = new Date(today);
    d.setDate(d.getDate() - i);
    return d;
  });

  const results = await Promise.allSettled(
    dates.map((date) => client.getSleepData(date))
  );

  return results
    .map((result, i) => {
      const dateStr = dates[i].toISOString().slice(0, 10);
      if (result.status === "rejected" || !result.value?.dailySleepDTO) {
        return { date: dateStr };
      }
      const { value: data } = result;
      const dto = data.dailySleepDTO;
      return {
        date: dateStr,
        sleepDurationMin: dto.sleepTimeSeconds ? Math.round(dto.sleepTimeSeconds / 60) : undefined,
        sleepScore: dto.sleepScores?.overall?.value ?? undefined,
        deepSleepMin: dto.deepSleepSeconds ? Math.round(dto.deepSleepSeconds / 60) : undefined,
        remSleepMin: dto.remSleepSeconds ? Math.round(dto.remSleepSeconds / 60) : undefined,
        avgOvernightHrv: data.avgOvernightHrv || undefined,
        hrvStatus: data.hrvStatus || undefined,
        restingHr: data.restingHeartRate || undefined,
        bodyBatteryChange: typeof data.bodyBatteryChange === "number" ? data.bodyBatteryChange : undefined,
      };
    })
    .sort((a, b) => a.date.localeCompare(b.date));
}