require 'spec_helper'

describe Spree::OrderContents, type: :model do
  let(:order) { Spree::Order.create }
  let(:variant) { create(:variant) }

  subject { described_class.new(order) }

  context "#add" do
    context 'given quantity is not explicitly provided' do
      it 'should add one line item' do
        line_item = subject.add(variant)
        expect(line_item.quantity).to eq(1)
        expect(order.line_items.size).to eq(1)
      end
    end

    context 'given a shipment' do
      it "ensure shipment calls update_amounts instead of order calling ensure_updated_shipments" do
        shipment = create(:shipment)
        expect(subject.order).to_not receive(:ensure_updated_shipments)
        expect(subject.order).to receive(:refresh_shipment_rates).with(Spree::ShippingMethod::DISPLAY_ON_BACK_END)
        expect(shipment).to receive(:update_amounts)
        subject.add(variant, 1, shipment: shipment)
      end
    end

    context 'not given a shipment' do
      it "ensures updated shipments" do
        expect(subject.order).to receive(:ensure_updated_shipments)
        subject.add(variant)
      end
    end

    it 'should add line item if one does not exist' do
      line_item = subject.add(variant, 1)
      expect(line_item.quantity).to eq(1)
      expect(order.line_items.size).to eq(1)
    end

    it 'should update line item if one exists' do
      subject.add(variant, 1)
      line_item = subject.add(variant, 1)
      expect(line_item.quantity).to eq(2)
      expect(order.line_items.size).to eq(1)
    end

    it "should update order totals" do
      expect(order.item_total.to_f).to eq(0.00)
      expect(order.total.to_f).to eq(0.00)

      subject.add(variant, 1)

      expect(order.item_total.to_f).to eq(19.99)
      expect(order.total.to_f).to eq(19.99)
    end

    context 'when store_credits payment' do
      let!(:payment) { create(:store_credit_payment, order: order) }

      it { expect { subject.add(variant, 1) }.to change { order.payments.store_credits.count }.by(-1) }
    end

    context "running promotions" do
      let(:promotion) { create(:promotion) }
      let(:calculator) { Spree::Calculator::FlatRate.new(preferred_amount: 10) }

      shared_context "discount changes order total" do
        before { subject.add(variant, 1) }
        it { expect(subject.order.total).not_to eq variant.price }
      end

      context "one active order promotion" do
        let!(:action) { Spree::Promotion::Actions::CreateAdjustment.create(promotion: promotion, calculator: calculator) }

        it "creates valid discount on order" do
          subject.add(variant, 1)
          expect(subject.order.adjustments.to_a.sum(&:amount)).not_to eq 0
        end

        include_context "discount changes order total"
      end

      context "one active line item promotion" do
        let!(:action) { Spree::Promotion::Actions::CreateItemAdjustments.create(promotion: promotion, calculator: calculator) }

        it "creates valid discount on order" do
          subject.add(variant, 1)
          expect(subject.order.line_item_adjustments.to_a.sum(&:amount)).not_to eq 0
        end

        include_context "discount changes order total"
      end

      context "VAT for variant with percent promotion" do
        let!(:category) { Spree::TaxCategory.create name: "Taxable Foo" }
        let!(:rate) do
          Spree::TaxRate.create(
            amount: 0.25,
            included_in_price: true,
            calculator: Spree::Calculator::DefaultTax.create,
            tax_category: category,
            zone: create(:zone_with_country, default_tax: true)
          )
        end
        let(:variant) { create(:variant, price: 1000) }
        let(:calculator) { Spree::Calculator::PercentOnLineItem.new(preferred_percent: 50) }
        let!(:action) { Spree::Promotion::Actions::CreateItemAdjustments.create(promotion: promotion, calculator: calculator) }

        it "should update included_tax_total" do
          expect(order.included_tax_total.to_f).to eq(0.00)
          subject.add(variant, 1)
          expect(order.included_tax_total.to_f).to eq(100)
        end

        it "should update included_tax_total after adding two line items" do
          subject.add(variant, 1)
          expect(order.included_tax_total.to_f).to eq(100)
          subject.add(variant, 1)
          expect(order.included_tax_total.to_f).to eq(200)
        end
      end
    end
  end

  context "#remove" do
    context "given an invalid variant" do
      it "raises an exception" do
        expect {
          subject.remove(variant, 1)
        }.to raise_error(ActiveRecord::RecordNotFound)
      end
    end

    context 'given quantity is not explicitly provided' do
      it 'should remove one line item' do
        line_item = subject.add(variant, 3)
        subject.remove(variant)

        expect(line_item.quantity).to eq(2)
      end
    end

    context 'given a shipment' do
      it "ensure shipment calls update_amounts instead of order calling ensure_updated_shipments" do
        line_item = subject.add(variant, 1)
        shipment = create(:shipment)
        expect(subject.order).to_not receive(:ensure_updated_shipments)
        expect(shipment).to receive(:update_amounts)
        subject.remove(variant, 1, shipment: shipment)
      end
    end

    context 'not given a shipment' do
      it "ensures updated shipments" do
        line_item = subject.add(variant, 1)
        expect(subject.order).to receive(:ensure_updated_shipments)
        subject.remove(variant)
      end
    end

    it 'should reduce line_item quantity if quantity is less the line_item quantity' do
      line_item = subject.add(variant, 3)
      subject.remove(variant, 1)

      expect(line_item.quantity).to eq(2)
    end

    context 'when store_credits payment' do
      let(:payment) { create(:store_credit_payment, order: order) }

      before do
        subject.add(variant, 1)
        payment
      end

      it { expect { subject.remove(variant, 1) }.to change { order.payments.store_credits.count }.by(-1) }
    end

    it 'should remove line_item if quantity matches line_item quantity' do
      subject.add(variant, 1)
      removed_line_item = subject.remove(variant, 1)

      # Should reflect the change already in Order#line_item
      expect(order.line_items).to_not include(removed_line_item)
    end

    it "should update order totals" do
      expect(order.item_total.to_f).to eq(0.00)
      expect(order.total.to_f).to eq(0.00)

      subject.add(variant,2)

      expect(order.item_total.to_f).to eq(39.98)
      expect(order.total.to_f).to eq(39.98)

      subject.remove(variant,1)
      expect(order.item_total.to_f).to eq(19.99)
      expect(order.total.to_f).to eq(19.99)
    end
  end

  context "#remove_line_item" do
    context 'given a shipment' do
      it "ensure shipment calls update_amounts instead of order calling ensure_updated_shipments" do
        line_item = subject.add(variant, 1)
        shipment = create(:shipment)
        expect(subject.order).to_not receive(:ensure_updated_shipments)
        expect(shipment).to receive(:update_amounts)
        subject.remove_line_item(line_item, shipment: shipment)
      end
    end

    context 'not given a shipment' do
      it "ensures updated shipments" do
        line_item = subject.add(variant, 1)
        expect(subject.order).to receive(:ensure_updated_shipments)
        subject.remove_line_item(line_item)
      end
    end

    context 'when store_credits payment' do
      let(:payment) { create(:store_credit_payment, order: order) }

      before do
        @line_item = subject.add(variant, 1)
        payment
      end

      it { expect { subject.remove_line_item(@line_item) }.to change { order.payments.store_credits.count }.by(-1) }
    end

    it 'should remove line_item' do
      line_item = subject.add(variant, 1)
      subject.remove_line_item(line_item)

      expect(order.reload.line_items).to_not include(line_item)
    end

    it "should update order totals" do
      expect(order.item_total.to_f).to eq(0.00)
      expect(order.total.to_f).to eq(0.00)

      line_item = subject.add(variant,2)

      expect(order.item_total.to_f).to eq(39.98)
      expect(order.total.to_f).to eq(39.98)

      subject.remove_line_item(line_item)
      expect(order.item_total.to_f).to eq(0.00)
      expect(order.total.to_f).to eq(0.00)
    end
  end

  context "update cart" do
    let!(:shirt) { subject.add variant, 1 }

    let(:params) do
      { line_items_attributes: {
        "0" => { id: shirt.id, quantity: 3 }
      } }
    end

    it "changes item quantity" do
      subject.update_cart params
      expect(shirt.quantity).to eq 3
    end

    it "updates order totals" do
      expect {
        subject.update_cart params
      }.to change { subject.order.total }
    end

    context 'when store_credits payment' do
      let!(:payment) { create(:store_credit_payment, order: order) }

      it { expect { subject.update_cart params }.to change { order.payments.store_credits.count }.by(-1) }
    end

    context "submits item quantity 0" do
      let(:params) do
        { line_items_attributes: {
          "0" => { id: shirt.id, quantity: 0 },
          "1" => { id: "666", quantity: 0}
        } }
      end

      it "removes item from order" do
        expect {
          subject.update_cart params
        }.to change { subject.order.line_items.count }
      end

      it "doesnt try to update unexistent items" do
        filtered_params = { line_items_attributes: {
          "0" => { id: shirt.id, quantity: 0 },
        } }
        expect(subject.order).to receive(:update_attributes).with(filtered_params)
        subject.update_cart params
      end

      it "should not filter if there is only one line item" do
        single_line_item_params = { line_items_attributes: { id: shirt.id, quantity: 0 } }
        expect(subject.order).to receive(:update_attributes).with(single_line_item_params)
        subject.update_cart single_line_item_params
      end

    end

    it "ensures updated shipments" do
      expect(subject.order).to receive(:ensure_updated_shipments)
      subject.update_cart params
    end
  end

  context "completed order" do
    let(:order) { create(:order, state: 'complete', completed_at: Time.current) }

    before { order.shipments.create! stock_location_id: variant.stock_location_ids.first }

    it "updates order payment state" do
      expect {
        subject.add variant
      }.to change { order.payment_state }

      expect {
        subject.remove variant
      }.to change { order.payment_state }
    end
  end
end