From a43c9e82d34e952983ff62f12ed919a53dcc0951 Mon Sep 17 00:00:00 2001
From: Khalim Conn-Kowlessar <kconnkowlessar@gmail.com>
Date: Wed, 10 Jul 2024 01:29:11 +0100
Subject: [PATCH] reverting electric boiler recs, adding cylinder thermostat
 rec

---
 recommendations/Costs.py                   | 19 +++++++
 recommendations/HotwaterRecommendations.py | 60 ++++++++++++++++++++--
 2 files changed, 75 insertions(+), 4 deletions(-)

diff --git a/recommendations/Costs.py b/recommendations/Costs.py
index 2dbce327..2159c0b0 100644
--- a/recommendations/Costs.py
+++ b/recommendations/Costs.py
@@ -1151,6 +1151,25 @@ class Costs:
             "labour_days": 1,
         }
 
+    def cylinder_thermostat(self):
+        """
+        Calculate the cost of installing a cylinder thermostat
+        """
+
+        # The £200 cost is a rough estimate based on internet research
+        total_cost = 200
+        subtotal_before_vat = total_cost / (1 + self.VAT_RATE)
+        vat = total_cost - subtotal_before_vat
+
+        # We estimate the labour hours to be 2
+        return {
+            "total": total_cost,
+            "subtotal": subtotal_before_vat,
+            "vat": vat,
+            "labour_hours": 2,
+            "labour_days": 1,
+        }
+
     def hot_water_tank_insulation(self):
         """
         Calculate the cost of installing hot water tank insulation
diff --git a/recommendations/HotwaterRecommendations.py b/recommendations/HotwaterRecommendations.py
index 95488d3f..86a031d6 100644
--- a/recommendations/HotwaterRecommendations.py
+++ b/recommendations/HotwaterRecommendations.py
@@ -1,6 +1,7 @@
 from backend.Property import Property
 from recommendations.Costs import Costs
-from recommendations.recommendation_utils import override_costs
+from recommendations.recommendation_utils import override_costs, check_simulation_difference
+from etl.epc_clean.epc_attributes.HotWaterAttributes import HotWaterAttributes
 
 
 class HotwaterRecommendations:
@@ -34,10 +35,15 @@ class HotwaterRecommendations:
             self.recommend_tank_insulation(phase=phase)
             return
 
+        if self.property.hotwater["clean_description"] == "From main system, no cylinder thermostat":
+            self.recommend_cylinder_thermostat(phase=phase)
+            return
+
     def recommend_tank_insulation(self, phase):
         """
         If the home has a very poor hot water system, this is often indicative of a lack of insulation on the hot water
-        tank. This is a very simple and cost effective improvement that can be made to the home.
+        tank. This is a very simple and cost effective improvement that can be made to the home. It will likely
+        take the efficiency from very poor to poor.
         """
 
         recommendation_cost = self.costs.hot_water_tank_insulation()
@@ -62,9 +68,55 @@ class HotwaterRecommendations:
                 "sap_points": None,
                 "already_installed": already_installed,
                 **recommendation_cost,
-                "simulation_config": {"hot_water_energy_eff_ending": "Average"},
+                "simulation_config": {"hot_water_energy_eff_ending": "Poor"},
                 "description_simulation": {
-                    "hot-water-energy-eff": "Average"
+                    "hot-water-energy-eff": "Poor"
+                }
+            }
+        )
+        return
+
+    def recommend_cylinder_thermostat(self, phase):
+        """
+        If the home has a very poor hot water system, this is often indicative of a lack of insulation on the hot water
+        tank. This is a very simple and cost effective improvement that can be made to the home.
+        """
+
+        recommendation_cost = self.costs.cylinder_thermostat()
+
+        already_installed = "cylinder_thermostat" in self.property.already_installed
+        if already_installed:
+            recommendation_cost = override_costs(recommendation_cost)
+            description = "Cylinder thermostat has already been installed, no further action required"
+        else:
+            description = "Install cylinder thermostat"
+
+        new_epc_description = "From main system"
+        hotwater_ending_config = HotWaterAttributes(new_epc_description).process()
+        hotwater_simulation_config = check_simulation_difference(
+            new_config=hotwater_ending_config, old_config=self.property.hotwater
+        )
+
+        simulation_config = {
+            "hot_water_energy_eff_ending": self.property.data["hot-water-energy-eff"],
+            **hotwater_simulation_config
+        }
+
+        self.recommendations.append(
+            {
+                "phase": phase,
+                "parts": [],
+                "type": "cylinder_thermostat",
+                "description": description,
+                "starting_u_value": None,
+                "new_u_value": None,
+                "sap_points": None,
+                "already_installed": already_installed,
+                **recommendation_cost,
+                "simulation_config": simulation_config,
+                "description_simulation": {
+                    "hot-water-energy-eff": self.property.data["hot-water-energy-eff"],
+                    "hotwater-description": new_epc_description,
                 }
             }
         )