"""
Shared helpers for NPM ACME authority mutations.
"""

from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path
import os


AUTHORITY_FILE = "/acme_authority/state/acme-authority"


@dataclass(frozen=True)
class GateConfig:
    request: bool
    renew: bool
    revoke: bool

    @property
    def any_enabled(self) -> bool:
        return self.request or self.renew or self.revoke


def log(message: str) -> None:
    print(f"[acme-authority] {message}", flush=True)


def env_bool(name: str, default: bool = False) -> bool:
    value = os.environ.get(name)

    if value is None:
        return default

    value = value.strip().lower()

    if value in {"1", "true", "yes", "on"}:
        return True

    if value in {"0", "false", "no", "off"}:
        return False

    raise RuntimeError(
        f"{name} must be true/false, yes/no, on/off, or 1/0; got {value!r}"
    )


def load_config() -> GateConfig:
    return GateConfig(
        request=env_bool("ACME_GATE_REQUEST"),
        renew=env_bool("ACME_GATE_RENEW"),
        revoke=env_bool("ACME_GATE_REVOKE"),
    )


def load_source(path: Path) -> str:
    if not path.is_file():
        raise RuntimeError(f"NPM certificate source not found: {path}")

    return path.read_text()


def write_source(path: Path, source: str) -> None:
    path.write_text(source)


def apply_authority_helper(source: str) -> str:
    """
    Install the common requireAcmeAuthority() helper.

    Implemented in the next development step.
    """
    raise NotImplementedError("authority helper mutation not implemented yet")


def verify(source: str, config: GateConfig) -> None:
    """
    Verify every requested mutation before certificate.js is written.

    Implemented after the individual mutation modules.
    """
    raise NotImplementedError("patch verification not implemented yet")