from datetime import datetime

from pydantic import BaseModel, ConfigDict
from pydantic.alias_generators import to_camel


class UsageFifoCandidateModel(BaseModel):
    model_config = ConfigDict(alias_generator=to_camel, populate_by_name=True)

    pallet_id: int
    pallet_code: str
    batch_no: str
    remaining_packages: int
    site_arrived_at: datetime


class UsageFifoRecommendationModel(BaseModel):
    model_config = ConfigDict(alias_generator=to_camel, populate_by_name=True)

    recommended: UsageFifoCandidateModel | None = None
    unknown_arrival_count: int = 0
    requires_skip_reason: bool = False
    message: str