from dataclasses import dataclass, field
from typing import Dict, List


@dataclass
class LocalProblem:
    neighborhood_id: str
    demand_kw: float  # total demand in kW
    pv_kw: float      # available PV generation in kW
    storage_kwh: float
    evs: int = 0
    metadata: Dict[str, float] = field(default_factory=dict)

    def net_load(self) -> float:
        # Simple net load: demand - pv
        return max(self.demand_kw - self.pv_kw, 0.0)