"""Batch-check add-on. On unless SINETTI_BATCH_CHECK_ENABLED is explicitly off."""

from __future__ import annotations

import os
from collections.abc import Mapping
from dataclasses import dataclass

from fastapi import FastAPI

_OFF = frozenset({"0", "false", "no", "off"})


@dataclass(frozen=True)
class BatchCheckStatus:
    active: bool
    reason: str


def deployment_requested(environ: Mapping[str, str] | None = None) -> bool:
    source = os.environ if environ is None else environ
    raw = source.get("SINETTI_BATCH_CHECK_ENABLED", "").strip().casefold()
    return raw not in _OFF


def status() -> BatchCheckStatus:
    if deployment_requested():
        return BatchCheckStatus(True, "active")
    return BatchCheckStatus(False, "deployment_disabled")


def register(app: FastAPI, dependencies: list) -> BatchCheckStatus:
    current = status()
    if not current.active:
        return current
    from sinetti_api.routers import batch_check

    app.include_router(batch_check.router, dependencies=dependencies)
    return current