import { getCurrentLocale } from '@/locales'

const ZH_UNITS = [
  { value: 1e8, symbol: '亿' },
  { value: 1e6, symbol: '百万' },
  { value: 1e4, symbol: '万' }
]

const EN_UNITS = [
  { value: 1e9, symbol: 'B' },
  { value: 1e6, symbol: 'M' },
  { value: 1e3, symbol: 'K' }
]

function formatWithUnits(num, units, decimals) {
  for (const unit of units) {
    if (num >= unit.value) {
      const formatted = num / unit.value
      const rounded = parseFloat(formatted.toFixed(decimals))
      return rounded + unit.symbol
    }
  }
  return num.toLocaleString()
}

export function formatNumber(num, options = {}) {
  if (num === null || num === undefined || isNaN(num)) return '-'
  const { decimals = 1, locale } = options
  const currentLocale = locale || getCurrentLocale()
  const isZh = currentLocale.startsWith('zh')
  const units = isZh ? ZH_UNITS : EN_UNITS
  return formatWithUnits(Number(num), units, decimals)
}

export function formatPercent(num, options = {}) {
  if (num === null || num === undefined || isNaN(num)) return '-'
  const { decimals = 1 } = options
  return parseFloat(Number(num).toFixed(decimals)) + '%'
}