from __future__ import annotations

import hashlib
from pathlib import Path

import pytest

from gnn4colliders.data.huggingface import resolve_data_files


def test_huggingface_source_resolves_files_and_labels(monkeypatch, tmp_path):
    root_file = tmp_path / "sample.root"
    root_file.write_bytes(b"fixture")
    monkeypatch.setattr(
        "gnn4colliders.data.huggingface.hf_hub_download",
        lambda **kwargs: str(root_file),
    )
    paths, labels = resolve_data_files(
        {
            "source": {
                "type": "huggingface",
                "repo_id": "org/data",
                "revision": "abc123",
                "files": [{"path": "sample.root", "label": 4}],
            }
        }
    )
    assert paths == [root_file]
    assert labels == [4]


def test_huggingface_source_verifies_checksum(monkeypatch, tmp_path):
    root_file = tmp_path / "sample.root"
    root_file.write_bytes(b"fixture")
    monkeypatch.setattr(
        "gnn4colliders.data.huggingface.hf_hub_download",
        lambda **kwargs: str(root_file),
    )
    checksum = hashlib.sha256(b"wrong").hexdigest()
    with pytest.raises(ValueError, match="SHA-256 mismatch"):
        resolve_data_files(
            {
                "source": {
                    "type": "huggingface",
                    "repo_id": "org/data",
                    "revision": "abc123",
                    "files": [{"path": "sample.root", "sha256": checksum}],
                }
            }
        )


def test_local_source_remains_unchanged(tmp_path: Path):
    local = tmp_path / "events.root"
    paths, label = resolve_data_files({"files": [str(local)], "label": 2})
    assert paths == [local]
    assert label == 2