import uuid
from app import db
from app.models import (Template, Service)
from sqlalchemy import (asc, desc)

from app.dao.dao_utils import (
    transactional,
    version_class
)


@transactional
@version_class(Template)
def dao_create_template(template):
    template.id = uuid.uuid4()  # must be set now so version history model can use same id
    template.archived = False
    db.session.add(template)


@transactional
@version_class(Template)
def dao_update_template(template):
    db.session.add(template)


def dao_get_template_by_id_and_service_id(template_id, service_id, version=None):
    if version is not None:
        return Template.get_history_model().query.filter_by(
            id=template_id,
            service_id=service_id,
            version=version).one()
    return Template.query.filter_by(id=template_id, service_id=service_id).one()


def dao_get_template_by_id(template_id, version=None):
    if version is not None:
        return Template.get_history_model().query.filter_by(
            id=template_id,
            version=version).one()
    return Template.query.filter_by(id=template_id).one()


def dao_get_all_templates_for_service(service_id):
    return Template.query.filter_by(
        service=Service.query.get(service_id)
    ).order_by(
        asc(Template.updated_at), asc(Template.created_at)
    ).all()


def dao_get_template_versions(service_id, template_id):
    history_model = Template.get_history_model()
    return history_model.query.filter_by(service_id=service_id, id=template_id).order_by(
        desc(history_model.version)).all()