import tempfile
import unittest
from datetime import datetime, time
from pathlib import Path
from zoneinfo import ZoneInfo

import snapshot


class ScheduleTests(unittest.TestCase):
    def test_day_window(self):
        now = datetime(2026, 7, 30, 12, 0, tzinfo=ZoneInfo("Europe/Prague"))
        self.assertTrue(snapshot.is_active(now, time(6), time(20)))
        self.assertFalse(snapshot.is_active(now, time(13), time(20)))

    def test_overnight_window(self):
        late = datetime(2026, 7, 30, 23, 0, tzinfo=ZoneInfo("Europe/Prague"))
        noon = datetime(2026, 7, 30, 12, 0, tzinfo=ZoneInfo("Europe/Prague"))
        self.assertTrue(snapshot.is_active(late, time(20), time(6)))
        self.assertFalse(snapshot.is_active(noon, time(20), time(6)))

    def test_equal_times_mean_all_day(self):
        now = datetime(2026, 7, 30, 12, 0, tzinfo=ZoneInfo("Europe/Prague"))
        self.assertTrue(snapshot.is_active(now, time(0), time(0)))


class FileTests(unittest.TestCase):
    def test_atomic_copy_replaces_destination(self):
        with tempfile.TemporaryDirectory() as directory:
            root = Path(directory)
            source = root / "dummy.jpg"
            destination = root / "web" / "camera.jpg"
            source.write_bytes(b"dummy")
            snapshot.atomic_copy(source, destination)
            self.assertEqual(destination.read_bytes(), b"dummy")


if __name__ == "__main__":
    unittest.main()