module Returnly
  class RefundPresenter

    def self.present_estimate(calculator)
      total = Money.new 0
      sub_total = Money.new 0

      calculator.line_items_return_items.values.flatten.each do |return_item|
        total += Money.from_amount return_item.total
        sub_total += Money.from_amount return_item.pre_tax_amount
      end

      total_refund_amount = total - calculator.order.promo_total
      shipping_tax        = calculator.shipping_tax
      {
        product_amount:                 sub_total.to_f,
        tax_amount:                     (total - sub_total).to_f,
        discount_amount:                calculator.order.promo_total.to_f,
        total_refund_amount:            total_refund_amount.to_f,
        refundable_shipping_amount:     calculator.order.shipment_total.to_f,
        refundable_shipping_tax_amount: shipping_tax.to_f,
        max_refundable_amount:          calculator.order.total.to_f,
        refunds_by_payment_method:      refunds_by_payment(calculator.order, total_refund_amount.to_d + calculator.order.shipment_total + shipping_tax)
      }
    end

    def self.present_line_items(calculator)
      calculator.line_items_return_items.values.map do |return_items|
        line_item = return_items.first.inventory_unit.line_item

        total_amount = 0.0
        sub_total = 0.0

        return_items.each do |return_item|
          total_amount += return_item.total
          sub_total += return_item.pre_tax_amount
        end

        {
          order_line_item_id: line_item.id,
          quantity: return_items.size,
          total_amount: total_amount.to_f,
          tax_amount: (total_amount - sub_total).to_f
        }
      end
    end


    def self.present_refund(refunder)
      customer_return = refunder.customer_return

      {
        refund_id:    customer_return.number,
        line_items:   customer_return.return_items.group_by { |ri| ri.inventory_unit.line_item.id }.map do |_, return_items|
          first_return_item = return_items.first
          {
            refund_line_item_id:      first_return_item.id,
            order_line_item_id:       first_return_item.inventory_unit.line_item.id,
            refunded_amount_per_item: first_return_item.amount.to_f,
            units:                    return_items.size
          }
        end,
        transactions: [
                        id:     refunder.reimbursement.id,
                        amount: refunder.reimbursement.total
                      ]
      }
    end

    private_class_method def self.refunds_by_payment(order, amount)
                           completed_payments = order.payments.completed
                           payment_amount = amount / completed_payments.count

                           completed_payments.each_with_object([]) do |payment, payments|
                             payments << {
                               code:                    payment.source_type.constantize.model_name.human,
                               amount:                  payment_amount.to_f,
                               original_transaction_id: ''
                             }
                           end
                         end
  end
end