export function formatYuan(v) {
  if (v == null || v === '') return '0.00'
  const n = Number(v)
  if (Number.isNaN(n)) return '0.00'
  return n.toFixed(2)
}

export function formatFenAsYuan(fen) {
  if (fen == null || Number.isNaN(fen)) return '0.00'
  return (fen / 100).toFixed(2)
}

/**
 * 计量 + 单位 +（规格），如 500 克（礼盒装）；无规格时不显示括号
 */
export function formatMeasureUnitSpec(measureValue, unitName, spec) {
  const unitText = (unitName || '').trim()
  const specText = spec != null ? String(spec).trim() : ''

  let base = ''
  if (measureValue != null && measureValue !== '') {
    const num = Number(measureValue)
    if (!Number.isNaN(num)) {
      const measureText = String(num).replace(/\.?0+$/, '')
      base = unitText ? `${measureText} ${unitText}` : measureText
    } else {
      const measureText = String(measureValue).trim()
      base = unitText ? `${measureText} ${unitText}` : measureText
    }
  } else if (unitText) {
    base = unitText
  } else if (!specText) {
    return '-'
  }

  if (specText) {
    return base ? `${base}（${specText}）` : `（${specText}）`
  }
  return base || '-'
}

/** 数量 × 计量单位（规格），如 10×500 克（礼盒装） */
export function formatQtyMeasureUnitSpec(qty, measureValue, unitName, spec) {
  const inner = formatMeasureUnitSpec(measureValue, unitName, spec)
  if (inner === '-') return String(qty)
  return `${qty}×${inner}`
}