module Solidus
  module Returnly
    class Refunds
      attr_accessor :calculator, :order, :line_items, :restock, :transactions

      def initialize(order:, line_items:, restock: true, transactions:)
        self.order = order
        self.line_items = line_items
        self.calculator = Calculator.new order, line_items
        self.restock = restock
        self.transactions = transactions
      end

      def restock_return(customer_return)
        customer_return.return_items.each do |item|
          customer_return.stock_location.restock(item.inventory_unit.variant, 1, customer_return)
        end
      end

      def proceed!
        customer_return = Spree::CustomerReturn.new customer_return_params
        customer_return.return_items = calculator.line_items_return_items.values.flatten

        customer_return.return_items.each do |return_item|
          return_item.amount = refund_amount_per_item
        end

        if customer_return.save!
          reimbursement = perform_reimbursement(customer_return)
          restock_return(customer_return) if self.restock

          processed_customer_return(customer_return, reimbursement)
        end
      end

      def processed_customer_return(customer_return, reimbursement)
        {
            refund_id: customer_return.number,
            created_at: customer_return.created_at,
            updated_at: customer_return.updated_at,
            line_items: customer_return.return_items.map {|ri|
              {
                  refund_line_item_id: ri.id,
                  order_line_item_id: ri.inventory_unit.line_item.id,
                  quantity: 1
              }
            },
            transactions: [
                id: reimbursement.id,
                amount: reimbursement.total
            ],
            note: "comment text",
            restock: true
        }
      end

      def perform_reimbursement(customer_return)
        reimbursement = Spree::Reimbursement.build_from_customer_return(customer_return)
        reimbursement.save!
        reimbursement.perform!
        reimbursement
      end

      def customer_return_params
        {
            stock_location_id: stock_location_id,
        }
      end

      def stock_location_id
        order.shipments.last.stock_location.id
      end

      def refund_available_amount
        @available_amount ||= self.transactions.sum {|t| Money.from_amount(t[:amount].to_f)}
      end

      def refund_amount_per_item
        refund_available_amount / line_items.size
      end
    end
  end

end