Added expected payback years

backend/apis/GoogleSolarApi.py

@@ -159,19 +159,42 @@ class GoogleSolarApi:
         # We now start finding the solar panel configurations
         self.optimise_solar_configuration(energy_consumption=energy_consumption, is_building=is_building)
 
-    def save_to_db(self, session, uprns_to_location):
+    def save_to_db(self, session, uprns_to_location, scenario_type):
         if self.insights_data is None:
             raise ValueError("No api data to store")
 
+        if scenario_type not in ["unit", "building"]:
+            raise Exception("Invalid scenario type. Must be either 'unit' or 'building'")
+
         if not self.need_to_store:
             return
 
         logger.info("Storing to database")
 
+        scenarios_data = self.panel_performance.head(1)[
+            ["n_panels", "yearly_dc_energy", "total_cost", "panneled_roof_area", "array_warrage",
+             "initial_ac_kwh_per_year", "lifetime_ac_kwh", "roi"]
+        ].rename(
+            columns={
+                "n_panels": "number_panels",
+                "yearly_dc_energy": "yearly_dc_kwh",
+                "total_cost": "cost",
+                "panneled_roof_area": "panelled_roof_area",
+                "array_warrage": "array_kwhp",
+                "initial_ac_kwh_per_year": "yearly_ac_kwh",
+                "lifetime_ac_kwh": "lifetime_ac_kwh",
+            }
+        )
+
+        # Adding missing fields with default values
+        scenarios_data["is_default"] = True
+        scenarios_data["scenario_type"] = scenario_type
+
         store_batch_data(
             session=session,
             api_data=self.insights_data,
-            uprns_to_location=uprns_to_location
+            uprns_to_location=uprns_to_location,
+            scenarios_data=scenarios_data
         )
 
     @staticmethod
@@ -286,13 +309,21 @@ class GoogleSolarApi:
                 roi = (generation_value + surplus_value) / panel_config["total_cost"]
                 generation_deficit = surplus_value
 
+            # Calculate expected payback years
+            if generation_value > 0:
+                expected_payback_years = panel_config["total_cost"] / (
+                    generation_value / self.installation_life_span)
+            else:
+                expected_payback_years = None  # or some high value indicating no payback
+
             # Generation deficit tells us how much more energy we need to meet the generation demand.
             roi_results.append(
                 {
                     "n_panels": panel_config["n_panels"],
                     "roi": roi,
                     "generation_value": generation_value,
-                    "generation_deficit": generation_deficit
+                    "generation_deficit": generation_deficit,
+                    "expected_payback_years": expected_payback_years
                 }
             )
 
@@ -309,6 +340,8 @@ class GoogleSolarApi:
             ["roi", "generation_deficit", "generation_value"], ascending=[False, True, False]
         )
 
+        panel_performance["expected_payback_years"] = np.ceil(panel_performance["expected_payback_years"]).astype(int)
+
         self.panel_performance = panel_performance
 
     def exclude_north_facing_segments(self):

backend/app/db/functions/solar_functions.py

@@ -2,7 +2,7 @@ import datetime
 import pytz
 from sqlalchemy.orm import Session
 from sqlalchemy.orm.exc import NoResultFound
-from backend.app.db.models.solar import Solar
+from backend.app.db.models.solar import Solar, SolarScenario
 
 
 def get_solar_data(session: Session, longitude: float = None, latitude: float = None, uprn: str = None):
@@ -35,28 +35,56 @@ def get_solar_data(session: Session, longitude: float = None, latitude: float =
         return None, None, False
 
 
-def store_batch_data(session: Session, api_data: dict, uprns_to_location: list):
+def store_batch_data(session: Session, api_data: dict, uprns_to_location: list, scenarios_data: list):
     """
     This function will store the API data to the solar table against all of the UPRNs with longitude and latitude.
     :param session: The database session
     :param api_data: The API data to store
-    :param data_list: A list of dictionaries containing uprn, longitude, and latitude
+    :param uprns_to_location: A list of dictionaries containing uprn, longitude, and latitude
+    :param scenarios_data: A list of dictionaries containing scenario data for each UPRN
     """
     try:
-        # Convert the data_list to a list of dicts for bulk insert
-        records_to_update = []
+        # Insert data into the Solar table and get the IDs
+        solar_records = []
         for data in uprns_to_location:
-            record = {
-                'uprn': data['uprn'],
-                'longitude': data['longitude'],
-                'latitude': data['latitude'],
-                'google_api_response': api_data,
-                'updated_at': datetime.datetime.now(pytz.utc)
-            }
-            records_to_update.append(record)
+            solar_record = Solar(
+                uprn=data['uprn'],
+                longitude=data['longitude'],
+                latitude=data['latitude'],
+                google_api_response=api_data,
+                updated_at=datetime.datetime.now(pytz.utc)
+            )
+            solar_records.append(solar_record)
 
-        # Perform bulk insert or update
-        session.bulk_insert_mappings(Solar, records_to_update)
+        session.bulk_save_objects(solar_records)
+        session.commit()
+
+        # Retrieve the IDs of the inserted records
+        inserted_ids = [record.id for record in solar_records]
+
+        # Prepare the data for SolarScenario
+        scenario_records = []
+        for index, solar_id in enumerate(inserted_ids):
+            scenarios = scenarios_data[index]  # Assuming scenarios_data has the same order as uprns_to_location
+            for scenario in scenarios:
+                scenario_record = SolarScenario(
+                    solar_id=solar_id,
+                    scenario_type=scenario['scenario_type'],
+                    number_panels=scenario['number_panels'],
+                    array_kwhp=scenario['array_kwhp'],
+                    lifetime_dc_kwh=scenario['lifetime_dc_kwh'],
+                    yearly_dc_kwh=scenario['yearly_dc_kwh'],
+                    lifetime_ac_kwh=scenario.get('lifetime_ac_kwh'),  # Optional field
+                    yearly_ac_kwh=scenario.get('yearly_ac_kwh'),  # Optional field
+                    cost=scenario['cost'],
+                    expected_payback_years=scenario.get('expected_payback_years'),  # Optional field
+                    panelled_roof_area=scenario['panelled_roof_area'],
+                    is_default=scenario['is_default']
+                )
+                scenario_records.append(scenario_record)
+
+        # Insert data into the SolarScenario table
+        session.bulk_save_objects(scenario_records)
         session.commit()
 
     except Exception as e:

backend/app/db/models/solar.py

@@ -1,6 +1,7 @@
 import datetime
 import pytz
-from sqlalchemy import Column, Integer, Float, DateTime, JSON
+from enum import Enum as PyEnum
+from sqlalchemy import Column, Integer, Float, DateTime, JSON, BigInteger, ForeignKey, Enum, Boolean
 from sqlalchemy.ext.declarative import declarative_base
 
 Base = declarative_base()
@@ -19,3 +20,26 @@ class Solar(Base):
         DateTime, nullable=False, default=datetime.datetime.now(pytz.utc), onupdate=datetime.datetime.now(pytz.utc)
     )
     google_api_response = Column(JSON, nullable=False)
+
+
+class ScenarioType(PyEnum):
+    unit = "unit"
+    building = "building"
+
+
+class SolarScenario(Base):
+    __tablename__ = 'solar_scenario'
+
+    id = Column(BigInteger, primary_key=True, autoincrement=True)
+    solar_id = Column(BigInteger, ForeignKey('solar.id'), nullable=False)
+    scenario_type = Column(Enum(ScenarioType), nullable=False)
+    number_panels = Column(Integer, nullable=False)
+    array_kwhp = Column(Integer, nullable=False)
+    lifetime_dc_kwh = Column(Float, nullable=False)
+    yearly_dc_kwh = Column(Float, nullable=False)
+    lifetime_ac_kwh = Column(Float)
+    yearly_ac_kwh = Column(Float)
+    cost = Column(Float, nullable=False)
+    expected_payback_years = Column(Float)
+    panelled_roof_area = Column(Float, nullable=False)
+    is_default = Column(Boolean, nullable=False)

backend/app/plan/router.py

@@ -431,7 +431,9 @@ async def trigger_plan(body: PlanTriggerRequest):
                 }
 
                 # Store the data in the database
-                solar_api_client.save_to_db(session=session, uprns_to_location=building_uprns[building_id])
+                solar_api_client.save_to_db(
+                    session=session, uprns_to_location=building_uprns[building_id], scenario_type="building"
+                )
 
                 # Insert this into the properties that have this building id
                 for p in input_properties: