UPDATE

irrigation/indicators.py

@@ -0,0 +1,41 @@
+from __future__ import annotations
+
+from typing import Any
+
+from django.apps import apps
+
+from farm_data.models import SensorData
+
+
+def build_water_stress_summary(sensor: Any) -> dict[str, Any]:
+    moisture = float(getattr(sensor, "soil_moisture", None) or 0.0)
+    water_stress = max(0, min(100, round(35 - (moisture / 2))))
+    return {
+        "waterStressIndex": water_stress,
+        "level": "پایین" if water_stress <= 20 else "متوسط" if water_stress <= 45 else "بالا",
+        "sourceMetric": {
+            "soilMoisture": round(moisture, 2),
+            "formula": "clamp(round(35 - (soil_moisture / 2)), 0, 100)",
+        },
+    }
+
+
+class WaterStressService:
+    def get_water_stress(self, *, farm_uuid: str, plant_name: str | None = None) -> dict[str, Any]:
+        sensor = SensorData.objects.filter(farm_uuid=farm_uuid).first()
+        if sensor is None:
+            raise ValueError("Farm not found.")
+        simulation_service = apps.get_app_config("crop_simulation").get_water_stress_service()
+        try:
+            return simulation_service.get_water_stress(
+                farm_uuid=str(sensor.farm_uuid),
+                plant_name=plant_name,
+            )
+        except Exception as exc:
+            fallback = {
+                "farm_uuid": str(sensor.farm_uuid),
+                **build_water_stress_summary(sensor),
+            }
+            fallback["sourceMetric"]["engine"] = "sensor_fallback"
+            fallback["sourceMetric"]["fallbackReason"] = str(exc)
+            return fallback