from datetime import datetime

from sqlalchemy import select
from sqlalchemy.orm import Session

from app.db.models import ModelDefinition


class ModelDefinitionRepository:
    def __init__(self, db: Session) -> None:
        self.db = db

    def create(self, entity: ModelDefinition) -> ModelDefinition:
        self.db.add(entity)
        self.db.commit()
        self.db.refresh(entity)
        return entity

    def list_all(self) -> list[ModelDefinition]:
        stmt = select(ModelDefinition).order_by(
            ModelDefinition.status.asc(),
            ModelDefinition.name.asc(),
        )
        return list(self.db.scalars(stmt))

    def get_by_id(self, model_id: str) -> ModelDefinition | None:
        return self.db.get(ModelDefinition, model_id)

    def get_by_code(self, code: str) -> ModelDefinition | None:
        stmt = select(ModelDefinition).where(ModelDefinition.code == code).limit(1)
        return self.db.scalar(stmt)

    def get_active_for_request(self, model: str) -> ModelDefinition | None:
        stmt = (
            select(ModelDefinition)
            .where(ModelDefinition.status == "active")
            .where(
                (ModelDefinition.code == model)
                | (ModelDefinition.model_name == model)
            )
            .limit(1)
        )
        return self.db.scalar(stmt)

    def update(self, entity: ModelDefinition) -> ModelDefinition:
        entity.updated_time = datetime.utcnow()
        self.db.commit()
        self.db.refresh(entity)
        return entity

    def delete(self, entity: ModelDefinition) -> None:
        self.db.delete(entity)
        self.db.commit()