from sqlalchemy.orm import Session
from sqlalchemy import desc

from . import models, schemas

def get_hosts(db: Session):
    hosts = db.query(models.Host).all()

    return hosts

def get_host_by_hostname(db: Session, hostname: str):
    db_host = db.query(models.Host).filter(models.Host.hostname == hostname).first()
    if db_host:
        return db_host
    return {}

def get_host_id_for_hostname(db: Session, hostname: str):
    try:
        db_host_id = db.query(models.Host).filter(models.Host.hostname == hostname).first().id
    except AttributeError:
        return -1
    return db_host_id

def create_host(db: Session, host: schemas.HostCreate):
    db_host = models.Host(
        hostname=host.hostname
    )

    db.add(db_host)
    db.commit()
    db.refresh(db_host)

    return db_host

def delete_host(db: Session, host_id: int):
    db_host = db.query(models.Host).filter(models.Host.id == host_id).first()
    db.delete(db_host)
    db.commit()

    return {
        "message": "Host successfully deleted"
    }

def delete_host_by_hostname(db: Session, hostname: str):
    db_host = db.query(models.Host).filter(models.Host.hostname == hostname).first()
    db.delete(db_host)
    db.commit()

    return {
        "message": "Host successfully deleted"
    }

def get_cpus_by_host_id(db: Session, host_id: int):
    return \
        db.query(models.CPU).filter(models.CPU.host_id == host_id).order_by(desc(models.CPU.time))

def create_cpu(db: Session, cpu: schemas.CPUCreate):
    db_cpu = models.CPU(
        time    = cpu.time,

        name   = cpu.name,
        socket = cpu.socket,
        cores  = cpu.cores,
        usage  = cpu.usage,

        host_id = cpu.host_id
    )

    db.add(db_cpu)
    db.commit()
    db.refresh(db_cpu)

    return db_cpu