import { computed } from 'vue'
import type { Ref } from 'vue'
import type { CraftingRecipe, ProfitResult, IngredientBreakdown, SortState } from '../types/crafting'
import type { FilterState, VariantType } from '../types/filters'
import { useAlbionPrices } from './useAlbionPrices'
import { formatItemId } from '../utils/formatting'
import { localProductionBonus, rrrFromBonus, isRrrExempt, FOCUS_LPB } from '../data/cityBonuses'

function variantOf(outputItemId: string): VariantType {
  const id = outputItemId.replace(/@\d$/, '') // strip enchantment suffix
  if (id.endsWith('_AVALON')) return 'avalon'
  if (id.endsWith('_CRYSTAL')) return 'crystal'
  if (/_SET[123]$/.test(id)) return 'basic'
  if (/_(?:UNDEAD|HELL|MORGANA|KEEPER|ROYAL|FEY)$/.test(id)) return 'artifact'
  return 'basic'
}

const VARIANT_ORDER: Record<VariantType, number> = { basic: 0, artifact: 1, avalon: 2, crystal: 3 }

function variantRank(outputItemId: string): number {
  return VARIANT_ORDER[variantOf(outputItemId)]
}

export function useCraftingProfit(
  recipes: CraftingRecipe[],
  filters: Ref<FilterState>,
  sortState: Ref<SortState>
) {
  const { getPrice } = useAlbionPrices()

  const profitResults = computed<ProfitResult[]>(() => {
    const f = filters.value
    const city = f.city

    const results: ProfitResult[] = []
    const nameLower = f.nameFilter.trim().toLowerCase()

    for (const recipe of recipes) {
      if (!f.tiers.has(recipe.tier)) continue
      if (f.enchantments !== null && !f.enchantments.has(recipe.enchantment)) continue
      if (f.variants !== null && !f.variants.has(variantOf(recipe.outputItemId))) continue
      const baseName = recipe.displayName.replace(/^T\d+\.\d /, '')
      if (f.selectedItemTypes !== null && !f.selectedItemTypes.has(baseName)) continue
      if (nameLower && !recipe.displayName.toLowerCase().includes(nameLower)) continue

      // Calculate material cost from ingredients only
      let basicCost = 0    // resources subject to RRR
      let artefactCost = 0 // artefacts / ALCHEMY_RARE — not subject to RRR
      let missingPrices = false

      // Track oldest price date (for status column)
      let oldestDate: string | null = null
      function trackDate(date: string) {
        if (!oldestDate || date < oldestDate) oldestDate = date
      }

      const ingredientBreakdown: IngredientBreakdown[] = []

      for (const ing of recipe.ingredients) {
        const ingEntry = getPrice(ing.itemId, city)
        const unitPrice = ingEntry?.sell_price_min ?? 0
        if (ingEntry === null || unitPrice === 0) {
          missingPrices = true
          ingredientBreakdown.push({
            itemId: ing.itemId,
            displayName: formatItemId(ing.itemId),
            quantity: ing.quantity,
            unitPrice: 0,
            totalCost: 0,
          })
        } else {
          trackDate(ingEntry.sell_price_min_date)
          const totalCost = unitPrice * ing.quantity
          if (isRrrExempt(ing.itemId)) artefactCost += totalCost
          else basicCost += totalCost
          ingredientBreakdown.push({
            itemId: ing.itemId,
            displayName: formatItemId(ing.itemId),
            quantity: ing.quantity,
            unitPrice,
            totalCost,
          })
        }
      }

      const materialCost = basicCost + artefactCost
      const lpb = localProductionBonus(city, recipe.outputItemId)
      const rrr = rrrFromBonus(lpb)
      const rrrFocus = rrrFromBonus(lpb + FOCUS_LPB)
      const effectiveMaterialCost = basicCost * (1 - rrr / 100) + artefactCost
      const effectiveMaterialCostFocus = basicCost * (1 - rrrFocus / 100) + artefactCost
      const priceAgeMs = missingPrices ? null : (oldestDate ? Date.now() - new Date(oldestDate).getTime() : null)

      results.push({
        recipe,
        materialCost,
        effectiveMaterialCost,
        effectiveMaterialCostFocus,
        rrr,
        rrrFocus,
        priceAgeMs,
        missingPrices,
        ingredientBreakdown,
      })
    }

    // Sort results
    const { field, direction } = sortState.value
    results.sort((a, b) => {
      let aVal: number | string
      let bVal: number | string

      switch (field) {
        case 'materialCost':
          aVal = a.effectiveMaterialCost
          bVal = b.effectiveMaterialCost
          break
        case 'displayName':
          aVal = a.recipe.displayName
          bVal = b.recipe.displayName
          break
        case 'tier':
          aVal = a.recipe.tier
          bVal = b.recipe.tier
          break
        case 'variantType':
          aVal = variantRank(a.recipe.outputItemId)
          bVal = variantRank(b.recipe.outputItemId)
          break
        default:
          aVal = a.effectiveMaterialCost
          bVal = b.effectiveMaterialCost
      }

      if (typeof aVal === 'string' && typeof bVal === 'string') {
        return direction === 'asc' ? aVal.localeCompare(bVal) : bVal.localeCompare(aVal)
      }
      const diff = (aVal as number) - (bVal as number)
      return direction === 'asc' ? diff : -diff
    })

    return results
  })

  return { profitResults }
}