from typing import List, Optional

from sqlalchemy.orm import Session
from sqlalchemy.sql.expression import true

from ..errors import ClanError
from . import schemas, sql_models

#########################
#                       #
#       service         #
#                       #
#########################


def create_service(db: Session, service: schemas.ServiceCreate) -> sql_models.Service:
    db_service = sql_models.Service(**service.dict())
    db.add(db_service)
    db.commit()
    db.refresh(db_service)
    return db_service


def get_services(
    db: Session, skip: int = 0, limit: int = 100
) -> List[sql_models.Service]:
    return db.query(sql_models.Service).offset(skip).limit(limit).all()


def get_services_by_entity_did(
    db: Session, entity_did: str, skip: int = 0, limit: int = 100
) -> List[sql_models.Service]:
    return (
        db.query(sql_models.Service)
        .filter(sql_models.Service.entity_did == entity_did)
        .offset(skip)
        .limit(limit)
        .all()
    )


def delete_service_by_entity_did(db: Session, entity_did: str) -> None:
    db.query(sql_models.Service).filter(
        sql_models.Service.entity_did == entity_did
    ).delete()
    db.commit()


def get_services_without_entity_id(
    db: Session, entity_did: str, skip: int = 0, limit: int = 100
) -> List[sql_models.Service]:
    return (
        db.query(sql_models.Service)
        .filter(sql_models.Service.entity_did != entity_did)
        .offset(skip)
        .limit(limit)
        .all()
    )


#########################
#                       #
#        Entity         #
#                       #
#########################
def create_entity(db: Session, entity: schemas.EntityCreate) -> sql_models.Entity:
    db_entity = sql_models.Entity(**entity.dict(), attached=False)
    db.add(db_entity)
    db.commit()
    db.refresh(db_entity)
    return db_entity


def get_entities(
    db: Session, skip: int = 0, limit: int = 100
) -> List[sql_models.Entity]:
    return db.query(sql_models.Entity).offset(skip).limit(limit).all()


def get_entity_by_did(db: Session, did: str) -> Optional[sql_models.Entity]:
    return db.query(sql_models.Entity).filter(sql_models.Entity.did == did).first()


# get attached
def get_attached_entities(
    db: Session, skip: int = 0, limit: int = 100
) -> List[sql_models.Entity]:
    return (
        db.query(sql_models.Entity)
        .filter(sql_models.Entity.attached == true())
        # https://stackoverflow.com/questions/18998010/flake8-complains-on-boolean-comparison-in-filter-clause
        .offset(skip)
        .limit(limit)
        .all()
    )


# Returns same entity if setting didnt changed something
def set_attached_by_entity_did(
    db: Session, entity_did: str, value: bool
) -> sql_models.Entity:
    db_entity = get_entity_by_did(db, entity_did)
    if db_entity is None:
        raise ClanError(f"Entity with did '{entity_did}' not found")

    setattr(db_entity, "attached", value)

    # save changes in db
    db.add(db_entity)
    db.commit()
    db.refresh(db_entity)
    return db_entity


def delete_entity_by_did(db: Session, did: str) -> None:
    db.query(sql_models.Entity).filter(sql_models.Entity.did == did).delete()
    db.commit()


def delete_entity_by_did_recursive(db: Session, did: str) -> None:
    delete_service_by_entity_did(db, did)
    delete_entity_by_did(db, did)