kif-ev · thegcat · Jun 15, 2017 · houndci-bot · Jun 15, 2017 · houndci-bot
diff --git a/app/interactors/pay_cart.rb b/app/interactors/pay_cart.rb
@@ -9,5 +9,6 @@ class PayCart
            CheckUserBalance,
            ApplyTransactionToUserBalance,
            CommitTransaction,
-           ApplyAndDestroyCart
+           ApplyAndDestroyCart,
+           WarnIfProductQuantityBelowThreshold
 end
diff --git a/app/interactors/warn_if_product_quantity_below_threshold.rb b/app/interactors/warn_if_product_quantity_below_threshold.rb
@@ -0,0 +1,10 @@
+class WarnIfProductQuantityBelowThreshold
+  include Interactor
+
+  def call
+    btp = context.cart.cart_items.map(&:product).
+          select(&:below_warning_threshold?).
+          compact.uniq
+    AdminMailer.btp_mail(btp: btp).deliver_later if btp.present?
+  end
+end
diff --git a/app/mailers/admin_mailer.rb b/app/mailers/admin_mailer.rb
@@ -0,0 +1,9 @@
+class AdminMailer < ApplicationMailer
+  def btp_mail(btp:)
+    @btp = btp
+    mail(
+      to: ENV['KDV_ADMIN_MAIL'],
+      subject: 'Some products are running low'
+    )
+  end
+end
diff --git a/app/mailers/application_mailer.rb b/app/mailers/application_mailer.rb
@@ -0,0 +1,4 @@
+class ApplicationMailer < ActionMailer::Base
+  default from: 'kdv@kif.rocks'
+  layout 'mailer'
+end
diff --git a/app/models/product.rb b/app/models/product.rb
@@ -11,4 +11,9 @@ def quantity
   def available_quantity
     pricings.to_a.sum &:available_quantity
   end
+
+  def below_warning_threshold?
+    return false if warning_threshold.nil?
+    quantity <= warning_threshold
+  end
 end
diff --git a/app/representers/product_representer.rb b/app/representers/product_representer.rb
@@ -4,6 +4,8 @@ class ProductRepresenter < ApplicationDecorator
   property :name
   property :quantity, writeable: false, type: Integer
   property :available_quantity, writeable: false, type: Integer
+  property :warning_threshold, type: Integer
+
   collection(
     :tags,
     decorator: TagRepresenter,

diff --git a/app/views/admin_mailer/btp_mail.text.erb b/app/views/admin_mailer/btp_mail.text.erb
@@ -0,0 +1,9 @@
+Moin,
+
+Folgende Produkte gehen bald leer, es sind nur noch übrig jeweils:
+
+<% @btp.each do |p| -%>
+* <%= p.name -%>: <%= p.quantity -%>
+<% end -%>
+
+Deine KDV Admins.
diff --git a/app/views/layouts/mailer.html.erb b/app/views/layouts/mailer.html.erb
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    <style>
+      /* Email styles need to be inline */
+    </style>
+  </head>
+
+  <body>
+    <%= yield %>
+  </body>
+</html>
diff --git a/app/views/layouts/mailer.text.erb b/app/views/layouts/mailer.text.erb
@@ -0,0 +1 @@
+<%= yield %>
diff --git a/db/migrate/20170614221707_add_threshold_to_products.rb b/db/migrate/20170614221707_add_threshold_to_products.rb
@@ -0,0 +1,5 @@
+class AddThresholdToProducts < ActiveRecord::Migration[5.1]
+  def change
+    add_column :products, :warning_threshold, :integer
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170614124236) do
+ActiveRecord::Schema.define(version: 20170614221707) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -92,6 +92,7 @@
     t.string "name"
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.integer "warning_threshold"
   end
 
   create_table "taggings", id: :serial, force: :cascade do |t|

diff --git a/spec/interactors/pay_cart_spec.rb b/spec/interactors/pay_cart_spec.rb
@@ -11,12 +11,13 @@
     end
     let(:context) { interactor.context }
     let(:user) { create :user, balance: 1000 }
-    let(:pricings) do
+    let(:products) do
       [
-        create(:pricing, price: 50, quantity: 5),
-        create(:pricing, price: 200, quantity: 5)
+        create(:product, price: 50, quantity: 5),
+        create(:product, price: 200, quantity: 5)
       ]
     end
+    let(:pricings) { products.map { |p| p.pricings.first } }
     let(:cart_items) do
       [
         create(:cart_item, quantity: 2, pricing: pricings[0]),

diff --git a/spec/interactors/warn_if_product_quantity_below_threshold_spec.rb b/spec/interactors/warn_if_product_quantity_below_threshold_spec.rb
@@ -0,0 +1,56 @@
+require 'rails_helper'
+
+RSpec.describe WarnIfProductQuantityBelowThreshold do
+  describe '#call' do
+    let(:interactor) { WarnIfProductQuantityBelowThreshold.new cart: cart }
+    let(:context) { interactor.context }
+
+    let(:products) do
+      [
+        create(:product),
+        create(:product)
+      ]
+    end
+    let(:cart_items) do
+      [
+        create(:cart_item, quantity: 2, pricing: products[0].pricings.first),
+        create(:cart_item, quantity: 1, pricing: products[1].pricings.first)
+      ]
+    end
+    let(:cart) { create :cart, cart_items: cart_items }
+
+    before do
+      allow(AdminMailer).to receive_message_chain(:btp_mail, :deliver_later)
+    end
+    before { interactor.call }
+
+    context 'when there are no products below their thresholds' do
+      it 'succeeds' do
+        expect(context).to be_a_success
+      end
+
+      it 'doesn\'t send an email' do
+        expect(AdminMailer).to_not have_received(:btp_mail)
+      end
+    end
+
+    context 'when some products are below their threshold' do
+      let(:products) do
+        [
+          create(:product, quantity: 5, warning_threshold: 12),
+          create(:product, quantity: 12, warning_threshold: 5),
+          create(:product, quantity: 5, warning_threshold: 10)
+        ]
+      end
+
+      it 'succeeds' do
+        expect(context).to be_a_success
+      end
+
+      it 'sends an email' do
+        expect(AdminMailer).to have_received(:btp_mail).
+          with(btp: [products[0]])
+      end
+    end
+  end
+end
diff --git a/spec/models/product_spec.rb b/spec/models/product_spec.rb
@@ -36,4 +36,34 @@
       end
     end
   end
+
+  describe '#below_warning_threshold?' do
+    subject { product.below_warning_threshold? }
+
+    context 'the warning_threshold is not set' do
+      before { product.warning_threshold = nil }
+
+      it { is_expected.to be false }
+    end
+
+    context 'a warning_threshold is set' do
+      context 'and it is less than the remaining items' do
+        before { product.warning_threshold = product.quantity - 1 }
+
+        it { is_expected.to be false }
+      end
+
+      context 'and it is the same as the remaining items' do
+        before { product.warning_threshold = product.quantity }
+
+        it { is_expected.to be true }
+      end
+
+      context 'and it is less than the remaining items' do
+        before { product.warning_threshold = product.quantity + 5 }
+
+        it { is_expected.to be true }
+      end
+    end
+  end
 end