const OIL_VOLUMES = new Set(['2.5', '5', '10', '15', '115'])

export function parseOilProductPaste(raw) {
  const result = {
    type: 'product',
    cn: '',
    en: '',
    memberPrice: null,
    retailPrice: null,
    volume: null,
    customDrops: null,
    productAmount: null,
    productUnit: null,
  }
  if (!raw || !raw.trim()) return result

  const text = raw.replace(/[：:]/g, ':').replace(/[￥¥]/g, '')

  const memberMatch = text.match(/(?:优惠顾客价|会员价|批发价)\s*:?\s*(\d+(?:\.\d+)?)/)
  const retailMatch = text.match(/零售价\s*:?\s*(\d+(?:\.\d+)?)/)
  const specMatch = text.match(/规格\s*:?\s*(\d+(?:\.\d+)?)\s*(毫升|ml|ML|克|g|G|颗|粒|片)/)

  if (memberMatch) result.memberPrice = Number(memberMatch[1])
  if (retailMatch) result.retailPrice = Number(retailMatch[1])

  for (const line of raw.split(/\r?\n/)) {
    const s = line.trim()
    if (!s) continue
    if (/优惠顾客价|会员价|零售价|点数|规格|PT\s*:|批发价/i.test(s)) continue
    const m = s.match(/^([^A-Za-z]+?)\s+([A-Za-z].*)$/)
    if (m) { result.cn = m[1].trim(); result.en = m[2].trim() } else { result.cn = s }
    break
  }

  if (specMatch) {
    const amount = specMatch[1]
    const unitRaw = specMatch[2].toLowerCase()
    const isMl = unitRaw === '毫升' || unitRaw === 'ml'
    if (isMl && OIL_VOLUMES.has(String(Number(amount)))) {
      result.type = 'oil'
      result.volume = String(Number(amount))
    } else {
      result.type = 'product'
      result.productAmount = Number(amount)
      result.productUnit = (unitRaw === '克' || unitRaw === 'g') ? 'g'
        : (unitRaw === '颗' || unitRaw === '粒' || unitRaw === '片') ? 'capsule'
        : 'ml'
    }
  }

  return result
}