from __future__ import annotations

import os
from pathlib import Path

from huggingface_hub import hf_hub_download


DEFAULT_MODEL_REPO_ID = "dimostzim/siRBench-model"
MODEL_REPO_ENV = "SIRBENCH_MODEL_REPO"
ARTIFACT_FILENAMES = (
    "xgb_model.json",
    "lgbm_model.txt",
    "calibrator.joblib",
    "feature_artifacts.json",
)


def get_model_repo_id() -> str:
    return os.getenv(MODEL_REPO_ENV, DEFAULT_MODEL_REPO_ID)


def resolve_artifact_dir(local_dir: str | Path | None = None) -> Path:
    if local_dir is not None:
        return Path(local_dir)
    return Path(__file__).resolve().parents[1] / "artifacts"


def ensure_artifact_file(filename: str, repo_id: str | None = None, local_dir: str | Path | None = None) -> Path:
    repo_id = repo_id or get_model_repo_id()
    artifact_dir = resolve_artifact_dir(local_dir)
    local_path = artifact_dir / filename
    if local_path.exists():
        return local_path

    artifact_dir.mkdir(parents=True, exist_ok=True)
    downloaded = hf_hub_download(
        repo_id=repo_id,
        filename=filename,
        repo_type="model",
    )
    return Path(downloaded)


def ensure_artifacts(repo_id: str | None = None, local_dir: str | Path | None = None) -> dict[str, Path]:
    repo_id = repo_id or get_model_repo_id()
    return {
        filename: ensure_artifact_file(filename, repo_id=repo_id, local_dir=local_dir)
        for filename in ARTIFACT_FILENAMES
    }