/**
 * 数据单位格式化工具
 *
 * 按 docs/tech/API.md 数据单位规范：
 * - soc: ‰（千分比）→ 百分比，÷10
 * - voltage: mV → V，÷1000
 * - current: mA → A，÷1000
 * - energy: Wh → kWh，÷1000
 */

export const fmtSoc = (v: number | null | undefined) =>
  v != null ? (v / 10).toFixed(1) + '%' : '-'

export const fmtVoltage = (v: number | null | undefined) =>
  v != null ? (v / 1000).toFixed(1) + ' V' : '-'

export const fmtCurrent = (v: number | null | undefined) =>
  v != null ? (v / 1000).toFixed(1) + ' A' : '-'

export const fmtEnergy = (v: number | null | undefined) =>
  v != null ? (v / 1000).toFixed(2) + ' kWh' : '-'

export const fmtEnergyKwh = (v: number | null | undefined) =>
  v != null ? (v / 1000).toFixed(3) + ' kWh' : '-'