from abc import ABCMeta, abstractmethod
import os
from typing import Tuple, Optional, Any

import jinja2

from app import app


class BaseAutomation(metaclass=ABCMeta):
    short_name: str = "base"
    description: str = "Abstract base automation."
    frequency: int

    """
    The short name of the automation provider. This is used as an opaque token throughout
    the portal system.
    """

    @abstractmethod
    def automate(self, working_dir: str, full: bool = False) -> Tuple[bool, str]:
        raise NotImplementedError()

    def tmpl_write(self, filename: str, template: str, working_dir: str, **kwargs: Any) -> None:
        """
        Write a Jinja2 template to the working directory for use by an automation module.

        :param filename: filename to write to
        :param template: Jinja2 template
        :param working_dir: temporary directory for running the Terraform automation
        :param kwargs: variables for use with the template
        :return: None
        """
        tmpl = jinja2.Template(template)
        with open(os.path.join(working_dir, filename), 'w', encoding="utf-8") as tfconf:
            tfconf.write(tmpl.render(**kwargs))