import { defineStore } from 'pinia'
import { ref, computed } from 'vue'
import { api } from '../composables/useApi'

export const DROPS_PER_ML = 18.6

export const VOLUME_DROPS = {
  '2.5': 46,
  '5': 93,
  '10': 186,
  '15': 280,
  '115': 2146,
}

export const useOilsStore = defineStore('oils', () => {
  const oils = ref({})
  const oilsMeta = ref({})

  // Getters
  const oilNames = computed(() =>
    Object.keys(oils.value).sort((a, b) => a.localeCompare(b, 'zh'))
  )

  function pricePerDrop(name) {
    return oils.value[name] || 0
  }

  function calcCost(ingredients) {
    return ingredients.reduce((sum, ing) => {
      return sum + pricePerDrop(ing.oil) * ing.drops
    }, 0)
  }

  function calcRetailCost(ingredients) {
    return ingredients.reduce((sum, ing) => {
      const meta = oilsMeta.value[ing.oil]
      if (meta && meta.retailPrice && meta.dropCount) {
        return sum + (meta.retailPrice / meta.dropCount) * ing.drops
      }
      return sum + pricePerDrop(ing.oil) * ing.drops
    }, 0)
  }

  function fmtPrice(n) {
    return '¥ ' + n.toFixed(2)
  }

  function fmtCostWithRetail(ingredients) {
    const cost = calcCost(ingredients)
    const retail = calcRetailCost(ingredients)
    const costStr = fmtPrice(cost)
    if (retail > cost) {
      return { cost: costStr, retail: fmtPrice(retail), hasRetail: true }
    }
    return { cost: costStr, retail: null, hasRetail: false }
  }

  // Actions
  async function loadOils() {
    const data = await api.get('/api/oils')
    const newOils = {}
    const newMeta = {}
    for (const oil of data) {
      const ppd = oil.drop_count ? oil.bottle_price / oil.drop_count : 0
      newOils[oil.name] = ppd
      newMeta[oil.name] = {
        bottlePrice: oil.bottle_price,
        dropCount: oil.drop_count,
        retailPrice: oil.retail_price ?? null,
        isActive: oil.is_active ?? true,
      }
    }
    oils.value = newOils
    oilsMeta.value = newMeta
  }

  async function saveOil(name, bottlePrice, dropCount, retailPrice) {
    await api.post('/api/oils', {
      name,
      bottle_price: bottlePrice,
      drop_count: dropCount,
      retail_price: retailPrice,
    })
    await loadOils()
  }

  async function deleteOil(name) {
    await api.delete(`/api/oils/${encodeURIComponent(name)}`)
    delete oils.value[name]
    delete oilsMeta.value[name]
  }

  return {
    oils,
    oilsMeta,
    oilNames,
    pricePerDrop,
    calcCost,
    calcRetailCost,
    fmtPrice,
    fmtCostWithRetail,
    loadOils,
    saveOil,
    deleteOil,
  }
})