"""Tests for cht.stream.tracker — RecordingTracker."""

import time
from pathlib import Path
from unittest.mock import patch, MagicMock

import pytest

from cht.stream.tracker import RecordingTracker


class TestRecordingTracker:
    def test_initial_duration_is_zero(self, tmp_path):
        tracker = RecordingTracker(tmp_path / "rec.ts")
        assert tracker.duration == 0.0

    def test_callback_called_on_update(self, tmp_path):
        rec = tmp_path / "rec.ts"
        rec.write_bytes(b"\x00" * 100_000)

        cb = MagicMock()
        tracker = RecordingTracker(rec, on_duration_update=cb)

        with patch.object(tracker, "_probe_duration", return_value=10.0):
            tracker.start()
            time.sleep(3)
            tracker.stop()

        cb.assert_called()
        assert cb.call_args[0][0] > 0

    def test_no_callback_if_file_missing(self, tmp_path):
        cb = MagicMock()
        tracker = RecordingTracker(tmp_path / "nonexistent.ts", on_duration_update=cb)
        tracker.start()
        time.sleep(3)
        tracker.stop()
        cb.assert_not_called()