"""Fetch InstaWarn datasets from Hugging Face when local data is absent."""

from __future__ import annotations

import os

from src.config import DATA_DIR, PROCESSED_UNIONS, PROJECT_ROOT

DATASET_REPO = os.environ.get(
    "INSTAWARN_DATASET_REPO",
    "jubayerahmad/instawarn-data",
)
MARKER = PROCESSED_UNIONS


def data_is_present() -> bool:
    return MARKER.is_file()


def ensure_data(*, force: bool = False) -> bool:
    """Download dataset files if missing. Returns True when data is available."""
    if os.environ.get("INSTAWARN_SKIP_DATA_DOWNLOAD", "").lower() in ("1", "true", "yes"):
        return data_is_present()

    if not force and data_is_present():
        return True

    from huggingface_hub import snapshot_download

    snapshot_download(
        repo_id=DATASET_REPO,
        repo_type="dataset",
        local_dir=str(PROJECT_ROOT),
        allow_patterns=["data/**"],
    )
    return data_is_present()