import type { MonitoringVehicle } from './types';
import type { VehicleRecentDay } from './api';

export function monitoringMileageValue(vehicle: MonitoringVehicle): number | string {
  if (vehicle.periodMileageKm !== undefined) return vehicle.periodMileageKm ?? '—';
  if (vehicle.mileageAnomaly) return '数据异常';
  if (!vehicle.isDataSynced) return '—';
  return Math.max(0, vehicle.dailyKm || 0);
}

export function hasDailyMileage(day: VehicleRecentDay): boolean {
  return day.isDataSynced && Number.isFinite(day.dailyKm) && day.dailyKm >= 0;
}

export function recentMileageStats(days: VehicleRecentDay[]) {
  const validDays = days.filter(hasDailyMileage);
  const totalKm = validDays.reduce((sum, day) => sum + day.dailyKm, 0);
  return {
    totalKm,
    synced: validDays.length,
    avg: validDays.length ? totalKm / validDays.length : 0,
    max: Math.max(1, ...validDays.map(day => day.dailyKm)),
    totalDays: days.length,
  };
}

export function mileageQualityLabel(vehicle: MonitoringVehicle): string | null {
  if (!vehicle.qualityStatus) return null;
  return `${vehicle.validDays ?? 0}天有效 · ${vehicle.missingDays ?? 0}天缺失 · ${vehicle.anomalyDays ?? 0}天异常`;
}