# frozen_string_literal: true

module PaymentServices
  # PaymentService
  class PaymentService
    attr_reader :error_messages

    def initialize(card_id, user_account)
      @user_account = user_account
      @card_id = card_id
      @service = CartToOrderService.new(@user_account)
      @order = @service.call
    end

    def call
      @error_messages = @service.error_messages and return if @order.nil?

      @payment = Payment.new(order_id: @order.id, card_id: @card_id, total:)

      unless @payment.save
        @error_messages = @payment.errors.as_json
        @order.destroy
        return
      end

      update_products_available_quantity
      update_order
    end

    private

    def update_products_available_quantity
      @order.products.joins(:product_orders).select('products.*, product_orders.quantity AS bought_quantity').distinct
            .find_each do |product|
        product.update(available_quantity: product.available_quantity - product.bought_quantity)
      end
    end

    def update_order
      @order.update(payment_id: @payment.id)
      @user_account.cart.product_carts.destroy_all
      @order
    end

    def total
      total = 0

      @order.product_orders.includes(:product).find_each do |product_order|
        total += product_order.total
      end
      total
    end
  end
end