import type { ISnmpConfig, TRuntimeUnit, TUpsModel } from './types.ts';

/**
 * Return the runtime unit that matches the bundled OID set for a UPS model.
 */
export function getDefaultRuntimeUnitForUpsModel(
  upsModel: TUpsModel | undefined,
  batteryRuntime?: number,
): TRuntimeUnit {
  switch (upsModel) {
    case 'cyberpower':
    case 'apc':
      return 'ticks';
    case 'eaton':
      return 'seconds';
    case 'custom':
    case 'tripplite':
    case 'liebert':
    case undefined:
      if (batteryRuntime !== undefined && batteryRuntime > 10000) {
        return 'ticks';
      }
      return 'minutes';
  }
}

/**
 * Convert an SNMP runtime value to minutes using explicit config first, then model defaults.
 */
export function convertRuntimeValueToMinutes(
  config: Pick<ISnmpConfig, 'runtimeUnit' | 'upsModel'>,
  batteryRuntime: number,
): number {
  if (batteryRuntime <= 0) {
    return batteryRuntime;
  }

  const runtimeUnit = config.runtimeUnit ||
    getDefaultRuntimeUnitForUpsModel(config.upsModel, batteryRuntime);

  if (runtimeUnit === 'seconds') {
    return Math.floor(batteryRuntime / 60);
  }

  if (runtimeUnit === 'ticks') {
    return Math.floor(batteryRuntime / 6000);
  }

  return batteryRuntime;
}