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
from cosmic_ledger.adapter import DeltaBlock, verify_block, verify_entry_inclusion


def test_deltablock_create_and_verify():
    dl = DeltaLog()
    # add a few simple entries
    for i in range(5):
        dl.add_entry({"v": i})

    key = b'test-key-for-adapter'
    raw_block = dl.export_delta_block(since_index=0, signer_key=key)

    block = DeltaBlock.from_dict(raw_block)

    # verify aggregated block signature and structure
    assert block.root == raw_block["root"]
    assert len(block.digests) == len(block.entries)
    assert verify_block(block, signer_key=key)


def test_verify_single_entry_inclusion():
    dl = DeltaLog()
    for i in range(3):
        dl.add_entry({"k": i})

    block = DeltaBlock.from_dict(dl.export_delta_block(since_index=0))
    # verify inclusion for each entry
    for idx, digest in enumerate(block.digests):
        assert verify_entry_inclusion(digest, block, idx)