import os
import time
import pytest
import tempfile
from pathlib import Path

from agent.scanner import is_file_locked, is_file_stable, DirectoryScanner

def test_file_lock_and_stability():
    """
    Tests detection of file locks, growing files, and stable files.
    """
    with tempfile.TemporaryDirectory() as tmpdir:
        test_file = Path(tmpdir) / "test_active.bak"
        test_file.write_text("initial data")

        # 1. Stable file test
        # When file was modified now, with min_stable_seconds=0, it should be immediately stable
        assert is_file_stable(test_file, min_stable_seconds=0) == True

        # 2. Scanner test with filter
        other_file = Path(tmpdir) / "ignored.txt"
        other_file.write_text("not a backup")

        scanner = DirectoryScanner(tmpdir, file_patterns="*.bak", min_stable_seconds=0)
        found = scanner.scan()
        assert len(found) == 1
        assert found[0].name == "test_active.bak"

        print("\n>>> File Lock & Scanner Test Passed!")