From b7255130b6130c4da8bf9126e77542ff7f83be3f Mon Sep 17 00:00:00 2001
From: Luis Ramos <luisramos0@gmail.com>
Date: Wed, 1 Jul 2020 17:18:07 +0100
Subject: [PATCH] Bring Package from spree_core

---
 app/models/spree/stock/package.rb       | 116 ++++++++++++++++++++++++
 spec/models/spree/stock/package_spec.rb | 110 ++++++++++++++++++++++
 2 files changed, 226 insertions(+)
 create mode 100644 app/models/spree/stock/package.rb
 create mode 100644 spec/models/spree/stock/package_spec.rb

diff --git a/app/models/spree/stock/package.rb b/app/models/spree/stock/package.rb
new file mode 100644
index 0000000000..68ef8837ab
--- /dev/null
+++ b/app/models/spree/stock/package.rb
@@ -0,0 +1,116 @@
+module Spree
+  module Stock
+    class Package
+      ContentItem = Struct.new(:variant, :quantity, :state)
+
+      attr_reader :stock_location, :order, :contents
+      attr_accessor :shipping_rates
+
+      def initialize(stock_location, order, contents=[])
+        @stock_location = stock_location
+        @order = order
+        @contents = contents
+        @shipping_rates = Array.new
+      end
+
+      def add(variant, quantity, state=:on_hand)
+        contents << ContentItem.new(variant, quantity, state)
+      end
+
+      def weight
+        contents.sum { |item| item.variant.weight * item.quantity }
+      end
+
+      def on_hand
+        contents.select { |item| item.state == :on_hand }
+      end
+
+      def backordered
+        contents.select { |item| item.state == :backordered }
+      end
+
+      def find_item(variant, state=:on_hand)
+        contents.select do |item|
+          item.variant == variant &&
+          item.state == state
+        end.first
+      end
+
+      def quantity(state=nil)
+        case state
+        when :on_hand
+          on_hand.sum { |item| item.quantity }
+        when :backordered
+          backordered.sum { |item| item.quantity }
+        else
+          contents.sum { |item| item.quantity }
+        end
+      end
+
+      def empty?
+        quantity == 0
+      end
+
+      def flattened
+        flat = []
+        contents.each do |item|
+          item.quantity.times do
+            flat << ContentItem.new(item.variant, 1, item.state)
+          end
+        end
+        flat
+      end
+
+      def flattened=(flattened)
+        contents.clear
+        flattened.each do |item|
+          current_item = find_item(item.variant, item.state)
+          if current_item
+            current_item.quantity += 1
+          else
+            add(item.variant, item.quantity, item.state)
+          end
+        end
+      end
+
+      def currency
+        #TODO calculate from first variant?
+      end
+
+      def shipping_categories
+        contents.map { |item| item.variant.shipping_category }.compact.uniq
+      end
+
+      def shipping_methods
+        shipping_categories.map { |sc| sc.shipping_methods }.flatten.uniq
+      end
+
+      def inspect
+        out = "#{order} - "
+        out << contents.map do |content_item|
+          "#{content_item.variant.name} #{content_item.quantity} #{content_item.state}"
+        end.join('/')
+        out
+      end
+
+      def to_shipment
+        shipment = Spree::Shipment.new
+        shipment.order = order
+        shipment.stock_location = stock_location
+        shipment.shipping_rates = shipping_rates
+
+        contents.each do |item|
+          item.quantity.times do |n|
+            unit = shipment.inventory_units.build
+            unit.pending = true
+            unit.order = order
+            unit.variant = item.variant
+            unit.state = item.state.to_s
+          end
+        end
+
+        shipment
+      end
+    end
+  end
+end
diff --git a/spec/models/spree/stock/package_spec.rb b/spec/models/spree/stock/package_spec.rb
new file mode 100644
index 0000000000..532ce23dae
--- /dev/null
+++ b/spec/models/spree/stock/package_spec.rb
@@ -0,0 +1,110 @@
+require 'spec_helper'
+
+module Spree
+  module Stock
+    describe Package do
+      let(:variant) { build(:variant, weight: 25.0) }
+      let(:stock_location) { build(:stock_location) }
+      let(:order) { build(:order) }
+
+      subject { Package.new(stock_location, order) }
+
+      it 'calculates the weight of all the contents' do
+        subject.add variant, 4
+        subject.weight.should == 100.0
+      end
+
+      it 'filters by on_hand and backordered' do
+        subject.add variant, 4, :on_hand
+        subject.add variant, 3, :backordered
+        subject.on_hand.count.should eq 1
+        subject.backordered.count.should eq 1
+      end
+
+      it 'calculates the quantity by state' do
+        subject.add variant, 4, :on_hand
+        subject.add variant, 3, :backordered
+
+        subject.quantity.should eq 7
+        subject.quantity(:on_hand).should eq 4
+        subject.quantity(:backordered).should eq 3
+      end
+
+      it 'returns nil for content item not found' do
+        item = subject.find_item(variant, :on_hand)
+        item.should be_nil
+      end
+
+      it 'finds content item for a variant' do
+        subject.add variant, 4, :on_hand
+        item = subject.find_item(variant, :on_hand)
+        item.quantity.should eq 4
+      end
+
+      it 'get flattened contents' do
+        subject.add variant, 4, :on_hand
+        subject.add variant, 2, :backordered
+        flattened = subject.flattened
+        flattened.select { |i| i.state == :on_hand }.size.should eq 4
+        flattened.select { |i| i.state == :backordered }.size.should eq 2
+      end
+
+      it 'set contents from flattened' do
+        flattened = [Package::ContentItem.new(variant, 1, :on_hand),
+                    Package::ContentItem.new(variant, 1, :on_hand),
+                    Package::ContentItem.new(variant, 1, :backordered),
+                    Package::ContentItem.new(variant, 1, :backordered)]
+
+        subject.flattened = flattened
+        subject.on_hand.size.should eq 1
+        subject.on_hand.first.quantity.should eq 2
+
+        subject.backordered.size.should eq 1
+      end
+
+      # Contains regression test for #2804
+      it 'builds a list of shipping methods from all categories' do
+        shipping_method1 = create(:shipping_method)
+        shipping_method2 = create(:shipping_method)
+        variant1 = mock_model(Variant, shipping_category: shipping_method1.shipping_categories.first)
+        variant2 = mock_model(Variant, shipping_category: shipping_method2.shipping_categories.first)
+        variant3 = mock_model(Variant, shipping_category: nil)
+        contents = [Package::ContentItem.new(variant1, 1),
+                    Package::ContentItem.new(variant1, 1),
+                    Package::ContentItem.new(variant2, 1),
+                    Package::ContentItem.new(variant3, 1)]
+
+        package = Package.new(stock_location, order, contents)
+        package.shipping_methods.size.should eq 2
+      end
+
+
+      it "can convert to a shipment" do
+        flattened = [Package::ContentItem.new(variant, 2, :on_hand),
+                    Package::ContentItem.new(variant, 1, :backordered)]
+        subject.flattened = flattened
+
+        shipping_method = build(:shipping_method)
+        subject.shipping_rates = [ Spree::ShippingRate.new(shipping_method: shipping_method, cost: 10.00, selected: true) ]
+
+        shipment = subject.to_shipment
+        shipment.order.should == subject.order
+        shipment.stock_location.should == subject.stock_location
+        shipment.inventory_units.size.should == 3
+
+        first_unit = shipment.inventory_units.first
+        first_unit.variant.should == variant
+        first_unit.state.should == 'on_hand'
+        first_unit.order.should == subject.order
+        first_unit.should be_pending
+
+        last_unit = shipment.inventory_units.last
+        last_unit.variant.should == variant
+        last_unit.state.should == 'backordered'
+        last_unit.order.should == subject.order
+
+        shipment.shipping_method.should eq shipping_method
+      end
+    end
+  end
+end