module Returnly
  module Builders
    class ReturnItem
      attr_accessor :order

      def initialize(order)
        @order = order
      end

      def build_by_requested_line_items(requested_line_items)
        is_returned_item = false
        items = requested_line_items.each_with_object([]) do |request_line_item, return_items|
          quantity = request_line_item[:units].to_i
          next return_items unless quantity > 0

          inventory_units = inventory_units_by(request_line_item[:order_line_item_id])
          if inventory_units.empty?
            inventory_units = returned_inventory_units_by(request_line_item[:order_line_item_id])
            request_line_item[:find_return?] = true
            is_returned_item = true
          end
          inventory_units.take(quantity).each do |inventory_unit|
            return_items << build_by_inventory_unit(inventory_unit, request_line_item)
          end

          return_items
        end
        {
          items: items,
          is_returned_items: is_returned_item
        }
      end

      def exact_build_by_inventory_unit(inventory_unit, options = {})
        Spree::ReturnItem.new(
          amount: inventory_unit.line_item.price,
          acceptance_status: 'accepted',
          inventory_unit_id: inventory_unit.id,
          reception_status_event: 'receive',
          resellable: options[:restock]
        )
      end

      def build_by_inventory_unit(inventory_unit, options = {})
        return exact_build_by_inventory_unit(inventory_unit, options) unless options[:find_return?]
        Spree::ReturnItem.find_by(
          amount: inventory_unit.line_item.price,
          inventory_unit_id: inventory_unit.id
        )
      end

      private

      def inventory_units_by(line_item_ids)
        order.inventory_units.includes(:line_item)
          .where(line_item_id: line_item_ids)
          .where.not(state: 'returned')
      end

      def returned_inventory_units_by(line_item_ids)
        order.inventory_units.includes(:line_item, :return_items)
          .where(line_item_id: line_item_ids, state: 'returned')
          .where(spree_return_items: { reimbursement_id: nil })
      end
    end
  end
end