from __future__ import annotations

from functools import lru_cache
from pathlib import Path
import re
from typing import Any

import yaml

from schemas.automation import AutomationJobConfig

_CONFIG_NAME_PATTERN = re.compile(r"^[a-z0-9][a-z0-9_-]{0,63}$")


def _automation_yaml_path(config_name: str) -> Path:
    if not _CONFIG_NAME_PATTERN.fullmatch(config_name):
        raise ValueError("invalid automation config name")
    return (
        Path(__file__).resolve().parents[2]
        / "core"
        / "config"
        / "static"
        / "automation"
        / f"{config_name}.yaml"
    )


@lru_cache(maxsize=16)
def load_static_automation_job_config(*, config_name: str) -> AutomationJobConfig:
    path = _automation_yaml_path(config_name)
    with path.open("r", encoding="utf-8") as file:
        loaded: Any = yaml.safe_load(file) or {}
    if not isinstance(loaded, dict):
        raise ValueError(f"invalid automation config format: {path}")
    return AutomationJobConfig.model_validate(loaded)