import sys
import pathlib

# Ensure repository root is on sys.path so tests can import the package
sys.path.insert(0, str(pathlib.Path(__file__).resolve().parents[1]))

from cosmic_ledger.delta import DeltaLog, BloomFilter


def test_checkpoint_includes_bloom_and_membership():
    dl = DeltaLog()
    # add several payloads
    for i in range(8):
        dl.add_entry({"v": i})

    # create checkpoint archiving first 5 entries
    cp = dl.checkpoint(prune_before_index=5)

    assert "bloom" in cp
    assert cp["bloom"] is not None

    # load bloom and check that all archived digests are (probably) present
    bf = BloomFilter.from_dict(cp["bloom"])
    archived = cp["digests"]
    # Bloom filters may have false positives but must not have false negatives
    for d in archived:
        assert d in bf

    # non-archived digest may or may not be in bloom (allow either)
    remaining = [e["digest"] for e in dl.entries]
    if remaining:
        # ensure at least one remaining digest is not erroneously marked as missing
        _ = remaining[0]  # presence not asserted