from __future__ import annotations

from typing import Any

from .growth_simulation import CurrentFarmChartSimulator, GrowthSimulationError


def build_yield_prediction_payload(*, farm_uuid: str, plant_name: str | None = None) -> dict[str, Any]:
    simulator = CurrentFarmChartSimulator()
    result = simulator.simulate(farm_uuid=farm_uuid, plant_name=plant_name)
    yield_estimate = float((result.get("metrics") or {}).get("yield_estimate") or 0.0)
    predicted_yield_tons = round(max(yield_estimate / 1000.0, 0.0), 2)
    return {
        "farm_uuid": farm_uuid,
        "plant_name": result.get("plant_name"),
        "predictedYieldTons": predicted_yield_tons,
        "predictedYieldRaw": round(yield_estimate, 2),
        "unit": "تن",
        "sourceUnit": "kg/ha",
        "simulationEngine": result.get("engine"),
        "simulationModel": result.get("model_name"),
        "scenarioId": result.get("scenario_id"),
        "simulationWarning": result.get("simulation_warning"),
        "supportingMetrics": result.get("metrics") or {},
    }


class YieldPredictionService:
    def get_yield_prediction(self, *, farm_uuid: str, plant_name: str | None = None) -> dict[str, Any]:
        try:
            return build_yield_prediction_payload(farm_uuid=farm_uuid, plant_name=plant_name)
        except GrowthSimulationError:
            raise