"""Tests for the AZ-407 MAVLink test passkey fixture (AC-5)."""

from __future__ import annotations

from pathlib import Path

REPO_ROOT = Path(__file__).resolve().parents[3]
PASSKEY_PATH = REPO_ROOT / "e2e" / "fixtures" / "secrets" / "mavlink-test-passkey.txt"


def _hex_lines(path: Path) -> list[str]:
    """Return non-comment, non-blank stripped lines."""
    out: list[str] = []
    for raw in path.read_text().splitlines():
        line = raw.strip()
        if not line or line.startswith("#"):
            continue
        out.append(line)
    return out


def test_passkey_has_comment_header() -> None:
    """AC-5: the first line is the human-readable test-only header."""
    # Arrange
    first_line = PASSKEY_PATH.read_text().splitlines()[0]
    # Assert
    assert first_line.startswith("# TEST ONLY")
    assert "not for production use" in first_line


def test_passkey_is_64_hex_chars() -> None:
    """AC-5: the secret line is exactly 64 hex chars (32 bytes)."""
    # Arrange
    lines = _hex_lines(PASSKEY_PATH)
    # Assert
    assert len(lines) == 1, f"expected one hex line, got {len(lines)}"
    secret = lines[0]
    assert len(secret) == 64, f"passkey length {len(secret)}, expected 64"
    int(secret, 16)  # raises ValueError if not hex


def test_passkey_is_lowercase() -> None:
    """Conventionally lowercase so byte-equality comparisons are stable."""
    # Arrange
    secret = _hex_lines(PASSKEY_PATH)[0]
    # Assert
    assert secret == secret.lower()