import { ref } from 'vue'

export type SpecialPricingRule = {
  product_id?: number
  package_id: number
  title: string
  profit_buy: number
  profit_sell: number
  show_product: boolean
}

export type SpecialPricingPayload = {
  enabled?: boolean
  products?: SpecialPricingRule[]
  board?: SpecialPricingRule | null
}

const state = ref<{
  enabled: boolean
  byProduct: Record<number, SpecialPricingRule>
  board: SpecialPricingRule | null
}>({
  enabled: false,
  byProduct: {},
  board: null,
})

export function setSpecialPricingPayload(payload?: SpecialPricingPayload | null) {
  if (!payload || !payload.enabled) {
    state.value = { enabled: false, byProduct: {}, board: null }
    return
  }

  const byProduct: Record<number, SpecialPricingRule> = {}
  for (const row of payload.products ?? []) {
    const pid = Number(row.product_id ?? 0)
    if (pid > 0) byProduct[pid] = row
  }

  state.value = {
    enabled: true,
    byProduct,
    board: payload.board ?? null,
  }
}

export function getSpecialPricingState() {
  return state
}

/** اگر سرور قبلاً special_pricing نزده، اختلاف تابلو را روی last اعمال کن */
export function applyBoardSpecialToLastPayload<T extends Record<string, any>>(payload: T): T {
  if (!payload || typeof payload !== 'object') return payload
  if (payload.special_pricing) return payload

  const board = state.value.board
  if (!state.value.enabled || !board) return payload

  const buyExtra = Number(board.profit_buy ?? 0)
  const sellExtra = Number(board.profit_sell ?? 0)
  if (buyExtra <= 0 && sellExtra <= 0) return payload

  const next = { ...payload } as T & Record<string, any>
  if (Number(next.buy ?? 0) > 0 && buyExtra > 0) {
    next.buy = Number(next.buy) + buyExtra
  }
  if (Number(next.sell ?? 0) > 0 && sellExtra > 0) {
    next.sell = Math.max(0, Number(next.sell) - sellExtra)
  }
  if (Number(next.price_last ?? 0) > 0 && buyExtra > 0) {
    next.price_last = Number(next.price_last) + buyExtra
  }
  next.special_pricing = {
    package_id: board.package_id,
    title: board.title,
    profit_buy: buyExtra,
    profit_sell: sellExtra,
  }
  return next
}