"""REQ-331 test: nova init scaffolds .nova/contract.yml.attestations/ empty.

P1 (nova/init.py + core/init_scaffold.py) creates the attestations dir
during `nova init`. This test explicitly verifies (a) the dir exists and
(b) it is EMPTY after init (listdir returns []) — a freshly scaffolded
repo has no attestations yet (they are produced later by
nova apply --sign-local-review / the JWS attestation flow, REQ-332).
"""

from __future__ import annotations

import os
import subprocess
import sys
from pathlib import Path


def _nova_help_cmd():
    """Return the command list to invoke `nova --help` (prefer installed entry)."""
    nova = os.path.join(os.path.dirname(sys.executable), "nova")
    if os.path.isfile(nova):
        return [nova, "--help"]
    return [sys.executable, "-m", "nova.cli", "--help"]


def test_init_attestations_dir_exists_and_is_empty(tmp_path):
    """nova init creates .nova/contract.yml.attestations/ and it is empty."""
    cmd = _nova_help_cmd()
    init_cmd = cmd[:-1] + ["init"]
    proc = subprocess.run(init_cmd, capture_output=True, text=True, cwd=str(tmp_path))
    assert proc.returncode == 0, f"nova init failed: {proc.stderr}"
    attest_dir = tmp_path / ".nova" / "contract.yml.attestations"
    assert attest_dir.is_dir(), ".nova/contract.yml.attestations/ not created"
    # REQ-331: the dir is empty after init (no attestations yet).
    entries = os.listdir(attest_dir)
    assert entries == [], (
        f".nova/contract.yml.attestations/ not empty after init: {entries}"
    )


def test_init_attestations_dir_is_a_directory_not_a_file(tmp_path):
    """The attestations path is a directory (not a file), so attestation
    JWS files can be written into it later (REQ-332 flow)."""
    cmd = _nova_help_cmd()
    init_cmd = cmd[:-1] + ["init"]
    proc = subprocess.run(init_cmd, capture_output=True, text=True, cwd=str(tmp_path))
    assert proc.returncode == 0, f"nova init failed: {proc.stderr}"
    attest_path = tmp_path / ".nova" / "contract.yml.attestations"
    assert attest_path.is_dir(), f"{attest_path} is not a directory"
    assert not attest_path.is_file(), f"{attest_path} is a file, not a directory"