require 'rails_helper'

module Spree
  RSpec.describe Exchange, type: :model do
    let(:order) { Spree::Order.new }

    let(:return_item_1) { build(:exchange_return_item) }
    let(:return_item_2) { build(:exchange_return_item) }
    let(:return_items) { [return_item_1, return_item_2] }
    let(:exchange) { Exchange.new(order, return_items) }

    describe "#description" do
      before do
        allow(return_item_1).to receive(:variant) { double(options_text: "foo") }
        allow(return_item_1).to receive(:exchange_variant) { double(options_text: "bar") }
        allow(return_item_2).to receive(:variant) { double(options_text: "baz") }
        allow(return_item_2).to receive(:exchange_variant) { double(options_text: "qux") }
      end

      it "describes the return items' change in options" do
        expect(exchange.description).to match /foo => bar/
        expect(exchange.description).to match /baz => qux/
      end
    end

    describe "#display_amount" do
      it "is the total amount of all return items" do
        expect(exchange.display_amount).to eq Spree::Money.new(0.0)
      end
    end

    describe "#perform!" do
      let(:return_item) { create(:exchange_return_item, inventory_unit: inventory_unit) }
      let(:return_items) { [return_item] }

      let(:inventory_unit) { create(:inventory_unit, order: order, line_item: line_item) }
      let(:order) { create(:shipped_order, line_items_count: 1) }
      let(:line_item) { order.line_items.first }

      subject { exchange.perform! }
      before { return_item.exchange_variant.stock_items.first.adjust_count_on_hand(20) }

      it "creates shipments for the order with the return items exchange inventory units" do
        expect { subject }.to change { order.shipments.count }.by(1)
        new_shipment = order.shipments.last
        expect(new_shipment).to be_ready
        new_inventory_units = new_shipment.inventory_units
        expect(new_inventory_units.count).to eq 1
        expect(new_inventory_units.first.original_return_item).to eq return_item
        expect(new_inventory_units.first.line_item).to eq return_item.inventory_unit.line_item
      end

      context "when it cannot create shipments for all items" do
        before do
          StockItem.where(variant_id: return_item.exchange_variant_id).each(&:really_destroy!)
        end

        it 'raises an UnableToCreateShipments error' do
          expect {
            subject
          }.to raise_error(Spree::Exchange::UnableToCreateShipments)
        end
      end
    end

    describe "#to_key" do # for dom_id
      it { expect(Exchange.new(nil, nil).to_key).to be_nil }
    end

    describe ".param_key" do # for dom_id
      it { expect(Exchange.param_key).to eq "spree_exchange" }
    end
  end
end