import { defineStore } from 'pinia'

interface CartItem {
  id: number
  quantity: number
  summary?: number
}

export const useSelectedBook = defineStore('selectedBook', {
  state: () => ({
    cartQuantities: [] as CartItem[],
  }),
  actions: {
    increment(id: number) {
      const item = this.cartQuantities.find((i) => i.id === id)
      if (item && item.quantity < 1) {
        item.quantity++
      }
    },
    decrement(id: number) {
      const item = this.cartQuantities.find((i) => i.id === id)
      if (item) {
        item.quantity--
      }
    },
    reset(id: number) {
      const idx = this.cartQuantities.findIndex((i) => i.id === id)
      if (idx !== -1) {
        this.cartQuantities.splice(idx, 1)
      }
    },
    addToCart(id: number) {
      if (!this.cartQuantities.find((i) => i.id === id)) {
        this.cartQuantities.push({ id, quantity: 1 })
      }
    },
    getQuantity(id: number) {
      return this.cartQuantities.find((i) => i.id === id)?.quantity || 0
    },
  },
  getters: {
    getTotalPrice: (state) => (books: { id: number; price: number }[]) => {
      const selected = state.cartQuantities.filter((i) => i.quantity > 0)
      if (selected.length === 2) {
        // Проверяем, что это две разные книги
        const ids = selected.map((i) => i.id)
        if (ids[0] !== ids[1]) {
          return 936
        }
      }
      // Обычная сумма
      return selected.reduce((sum, item) => {
        const book = books.find((b) => b.id === item.id)
        return sum + (book ? book.price * item.quantity : 0)
      }, 0)
    },
  },
})