Derive weekly rent

app/models/case_log.rb

@@ -85,6 +85,31 @@ class CaseLog < ApplicationRecord
     end
   end
 
+  def weekly_rent
+    return unless brent && period
+
+    case rent_period
+    when "Every 2 weeks"
+      brent / 2
+    when "Every 4 weeks"
+      brent / 4
+    when "Every calendar month"
+      brent * 12 / 52
+    when "Weekly for 50 weeks"
+      brent / 52 * 50
+    when "Weekly for 49 weeks"
+      brent / 52 * 49
+    when "Weekly for 48 weeks"
+      brent / 52 * 48
+    when "Weekly for 47 weeks"
+      brent / 52 * 47
+    when "Weekly for 46 weeks"
+      brent / 52 * 46
+    when "Weekly for 52 weeks"
+      brent
+    end
+  end
+
   def applicable_income_range
     return unless ecstat1
 
@@ -231,6 +256,31 @@ class CaseLog < ApplicationRecord
     reason == 1
   end
 
+  def rent_period
+    return unless period
+
+    case period
+    when 0
+      "Every 2 weeks"
+    when 1
+      "Every 4 weeks"
+    when 2
+      "Every calendar month"
+    when 3
+      "Weekly for 50 weeks"
+    when 4
+      "Weekly for 49 weeks"
+    when 5
+      "Weekly for 48 weeks"
+    when 6
+      "Weekly for 47 weeks"
+    when 7
+      "Weekly for 46 weeks"
+    when 8
+      "Weekly for 52 weeks"
+    end
+  end
+
 private
 
   PIO = Postcodes::IO.new
@@ -304,6 +354,7 @@ private
     self.totchild = get_totchild
     self.totelder = get_totelder
     self.totadult = get_totadult
+    self.wrent = weekly_rent if brent.present? && period.present?
     if %i[brent scharge pscharge supcharg].any? { |f| public_send(f).present? }
       self.brent ||= 0
       self.scharge ||= 0

db/migrate/20220311151611_add_derived_fields.rb

@@ -0,0 +1,12 @@
+class AddDerivedFields < ActiveRecord::Migration[7.0]
+  def change
+    change_table :case_logs, bulk: true do |t|
+      t.decimal :wrent, precision: 10, scale: 2
+      t.decimal :wscharge, precision: 10, scale: 2
+      t.decimal :wpschrge, precision: 10, scale: 2
+      t.decimal :wsupchrge, precision: 10, scale: 2
+      t.decimal :wtchrge, precision: 10, scale: 2
+      t.decimal :wtshortfall, precision: 10, scale: 2
+    end
+  end
+end

db/schema.rb

@@ -218,6 +218,12 @@ ActiveRecord::Schema[7.0].define(version: 202202071123100) do
     t.integer "rent_type"
     t.integer "has_benefits"
     t.integer "renewal"
+    t.decimal "wrent", precision: 10, scale: 2
+    t.decimal "wscharge", precision: 10, scale: 2
+    t.decimal "wpschrge", precision: 10, scale: 2
+    t.decimal "wsupchrge", precision: 10, scale: 2
+    t.decimal "wtchrge", precision: 10, scale: 2
+    t.decimal "wtshortfall", precision: 10, scale: 2
     t.index ["managing_organisation_id"], name: "index_case_logs_on_managing_organisation_id"
     t.index ["owning_organisation_id"], name: "index_case_logs_on_owning_organisation_id"
   end

spec/fixtures/exports/case_logs.xml

@@ -160,5 +160,11 @@
     <rent_type>1</rent_type>
     <has_benefits>1</has_benefits>
     <renewal>0</renewal>
+    <wrent>100.0</wrent>
+    <wscharge/>
+    <wpschrge/>
+    <wsupchrge/>
+    <wtchrge/>
+    <wtshortfall/>
   </form>
 </forms>

spec/models/case_log_spec.rb

@@ -298,6 +298,87 @@ RSpec.describe CaseLog do
             expect(record_from_db["lettype"]).to eq(1)
           end
         end
+
+        context "when rent is paid bi-weekly" do
+          it "correctly derives and saves weekly rent" do
+            case_log.update!(brent: 100, period: 0)
+            record_from_db = ActiveRecord::Base.connection.execute("select wrent from case_logs where id=#{case_log.id}").to_a[0]
+            expect(case_log.wrent).to eq(50.0)
+            expect(record_from_db["wrent"]).to eq(50.0)
+          end
+        end
+
+        context "when rent is paid every 4 weeks" do
+          it "correctly derives and saves weekly rent" do
+            case_log.update!(brent: 120, period: 1)
+            record_from_db = ActiveRecord::Base.connection.execute("select wrent from case_logs where id=#{case_log.id}").to_a[0]
+            expect(case_log.wrent).to eq(30.0)
+            expect(record_from_db["wrent"]).to eq(30.0)
+          end
+        end
+
+        context "when rent is paid every calendar month" do
+          it "correctly derives and saves weekly rent" do
+            case_log.update!(brent: 130, period: 2)
+            record_from_db = ActiveRecord::Base.connection.execute("select wrent from case_logs where id=#{case_log.id}").to_a[0]
+            expect(case_log.wrent).to eq(30.0)
+            expect(record_from_db["wrent"]).to eq(30.0)
+          end
+        end
+
+        context "when rent is paid weekly for 50 weeks" do
+          it "correctly derives and saves weekly rent" do
+            case_log.update!(brent: 130, period: 3)
+            record_from_db = ActiveRecord::Base.connection.execute("select wrent from case_logs where id=#{case_log.id}").to_a[0]
+            expect(case_log.wrent).to eq(125.0)
+            expect(record_from_db["wrent"]).to eq(125.0)
+          end
+        end
+
+        context "when rent is paid weekly for 49 weeks" do
+          it "correctly derives and saves weekly rent" do
+            case_log.update!(brent: 130, period: 4)
+            record_from_db = ActiveRecord::Base.connection.execute("select wrent from case_logs where id=#{case_log.id}").to_a[0]
+            expect(case_log.wrent).to eq(122.5)
+            expect(record_from_db["wrent"]).to eq(122.5)
+          end
+        end
+
+        context "when rent is paid weekly for 48 weeks" do
+          it "correctly derives and saves weekly rent" do
+            case_log.update!(brent: 130, period: 5)
+            record_from_db = ActiveRecord::Base.connection.execute("select wrent from case_logs where id=#{case_log.id}").to_a[0]
+            expect(case_log.wrent).to eq(120.0)
+            expect(record_from_db["wrent"]).to eq(120.0)
+          end
+        end
+
+        context "when rent is paid weekly for 47 weeks" do
+          it "correctly derives and saves weekly rent" do
+            case_log.update!(brent: 130, period: 6)
+            record_from_db = ActiveRecord::Base.connection.execute("select wrent from case_logs where id=#{case_log.id}").to_a[0]
+            expect(case_log.wrent).to eq(117.5)
+            expect(record_from_db["wrent"]).to eq(117.5)
+          end
+        end
+
+        context "when rent is paid weekly for 46 weeks" do
+          it "correctly derives and saves weekly rent" do
+            case_log.update!(brent: 130, period: 7)
+            record_from_db = ActiveRecord::Base.connection.execute("select wrent from case_logs where id=#{case_log.id}").to_a[0]
+            expect(case_log.wrent).to eq(115.0)
+            expect(record_from_db["wrent"]).to eq(115.0)
+          end
+        end
+
+        context "when rent is paid weekly for 52 weeks" do
+          it "correctly derives and saves weekly rent" do
+            case_log.update!(brent: 130, period: 8)
+            record_from_db = ActiveRecord::Base.connection.execute("select wrent from case_logs where id=#{case_log.id}").to_a[0]
+            expect(case_log.wrent).to eq(130.0)
+            expect(record_from_db["wrent"]).to eq(130.0)
+          end
+        end
       end
 
       context "when the owning organisation is an LA" do