"""Runtime configuration."""

from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path

DEFAULT_HF_REPO = "ZipLime/corporate-actions"

# Everything here is derived from one sibling dataset. No new source is
# fetched: the dividends were already parsed out of XBRL, and the splits are
# recovered from the restatement history that dataset keeps precisely because
# it never overwrites what a filing said.
SOURCE_REPO = "ZipLime/company-fundamentals"
SIBLING_DIR = "Company_fundamentals"


@dataclass(frozen=True, slots=True)
class Settings:
    data_dir: Path = Path("data")
    hf_repo: str = DEFAULT_HF_REPO
    siblings_dir: Path | None = None

    @classmethod
    def from_env(cls, **overrides) -> Settings:
        siblings = os.environ.get("CORPORATE_ACTIONS_SIBLINGS")
        return cls(
            data_dir=Path(overrides.get("data_dir") or os.environ.get("DATA_DIR", "data")),
            hf_repo=overrides.get("hf_repo") or os.environ.get("HF_DATASET_REPO", DEFAULT_HF_REPO),
            siblings_dir=Path(siblings) if siblings else None,
        )