module Comee
  module Core
    class CustomerOrderService
      def submit(id)
        order = CustomerOrder.find_by(id: id)
        raise(StandardError, "Customer order with id `#{id}` not found.") unless order

        unless CustomerOrder.statuses[order.status] == CustomerOrder.statuses[:draft]
          raise(StandardError, "Customer order should be in draft state.")
        end

        raise(StandardError, "Customer order should have at least one item.") unless order.customer_order_items.count.positive?

        order.update!(status: CustomerOrder.statuses[:submitted])
        order
      end

      def submit_for_confirmation(id)
        order = CustomerOrder.find_by(id: id)
        raise(StandardError, "Customer order with id `#{id}` not found.") unless order

        unless CustomerOrder.statuses[order.status] == CustomerOrder.statuses[:submitted]
          raise(StandardError, "Customer order should be in submitted state.")
        end

        raise(StandardError, "Customer order does not have any items.") if order.customer_order_items.count.zero?

        order.update!(status: CustomerOrder.statuses[:awaiting_confirmation])
        order
      end

      def accept(id)
        order = CustomerOrder.find_by(id: id)
        raise(StandardError, "Customer order with id `#{id}` not found.") unless order

        if CustomerOrder.statuses[order.status] == CustomerOrder.statuses[:accepted]
          raise(StandardError, "Customer order is already in accepted state.")
        end

        allowed_statuses = [CustomerOrder.statuses[:submitted], CustomerOrder.statuses[:awaiting_confirmation]]
        unless allowed_statuses.include?(CustomerOrder.statuses[order.status])
          raise(StandardError, "Customer order should be in submitted or awaiting confirmation state.")
        end

        raise(StandardError, "Customer order does not have any items.") if order.customer_order_items.count.zero?

        sales_order = nil
        CustomerOrder.transaction do
          sales_order = SalesOrder.create!(
            order_number: order.order_number,
            customer_order: order,
            status: SalesOrder.statuses[:draft]
          )
          items = order.customer_order_items.each_with_object([]) do |item, res|
            next if item.canceled?

            res << {
              sales_order_id: sales_order.id,
              customer_order_item_id: item.id,
              product_id: item.product_id,
              unit_id: item.unit_id,
              quantity: item.quantity,
              price: item.price,
              delivery_date: item.delivery_date
            }
          end
          SalesOrderItem.insert_all!(items)
          order.update!(status: CustomerOrder.statuses[:accepted])
        end
        sales_order
      end

      def cancel(id)
        order = CustomerOrder.find_by(id: id)
        raise(StandardError, "Customer order with id `#{id}` not found.") unless order

        if CustomerOrder.statuses[order.status] == CustomerOrder.statuses[:canceled]
          raise(StandardError, "Customer order is already canceled.")
        end

        order.update!(status: CustomerOrder.statuses[:canceled])
        order
      end
    end
  end
end