"""Tests for cht.stream.manager — StreamManager orchestration."""

import json
import time
from unittest.mock import patch, MagicMock

import pytest

from cht.stream.manager import StreamManager


@pytest.fixture
def manager(tmp_path):
    with patch("cht.stream.manager.SESSIONS_DIR", tmp_path):
        mgr = StreamManager(session_id="test_session")
        yield mgr
        mgr.stop_all()


class TestInit:
    def test_session_id_default(self, tmp_path):
        with patch("cht.stream.manager.SESSIONS_DIR", tmp_path):
            mgr = StreamManager()
            assert mgr.session_id

    def test_session_id_custom(self, manager):
        assert manager.session_id == "test_session"

    def test_dirs_not_created_on_init(self, manager):
        assert not manager.stream_dir.exists()


class TestSetupDirs:
    def test_creates_all_subdirs(self, manager):
        manager.setup_dirs()
        assert manager.stream_dir.is_dir()
        assert manager.frames_dir.is_dir()
        assert manager.transcript_dir.is_dir()
        assert manager.agent_dir.is_dir()

    def test_idempotent(self, manager):
        manager.setup_dirs()
        manager.setup_dirs()
        assert manager.stream_dir.is_dir()


class TestStreamUrl:
    def test_default_url(self, manager):
        assert "0.0.0.0" in manager.stream_url
        assert "4444" in manager.stream_url
        assert "listen" in manager.stream_url


class TestRecordingPath:
    def test_is_in_stream_dir(self, manager):
        assert manager.recording_path.parent == manager.stream_dir
        assert manager.recording_path.name == "recording.ts"


class TestStartRecorder:
    @patch("cht.stream.manager.ff.run_async")
    @patch("cht.stream.manager.ff.receive_and_record")
    def test_calls_ffmpeg_module(self, mock_record, mock_async, manager):
        manager.setup_dirs()
        mock_node = MagicMock()
        mock_record.return_value = mock_node

        manager.start_recorder()

        mock_record.assert_called_once_with(
            manager.stream_url, manager.recording_path,
        )
        mock_async.assert_called_once_with(mock_node, pipe_stderr=True)
        assert "recorder" in manager._procs


class TestStopAll:
    @patch("cht.stream.manager.ff.stop_proc")
    def test_stops_all_procs(self, mock_stop, manager):
        proc1, proc2 = MagicMock(), MagicMock()
        manager._procs = {"a": proc1, "b": proc2}

        manager.stop_all()

        mock_stop.assert_any_call(proc1)
        mock_stop.assert_any_call(proc2)
        assert len(manager._procs) == 0

    def test_sets_stop_flag(self, manager):
        manager.stop_all()
        assert "stop" in manager._stop_flags


class TestExtractNewFrames:
    @patch("cht.stream.manager.ff.extract_scene_frames")
    def test_calls_ffmpeg_with_start_time(self, mock_extract, manager):
        manager.setup_dirs()
        rec = manager.recording_path
        rec.touch()

        mock_extract.return_value = ("", "")
        manager._extract_new_frames(rec, start_time=10.0, start_number=5)

        mock_extract.assert_called_once_with(
            rec,
            manager.frames_dir,
            scene_threshold=0.3,
            max_interval=30,
            start_number=5,
            start_time=10.0,
        )

    @patch("cht.stream.manager.ff.extract_scene_frames")
    def test_indexes_new_frames(self, mock_extract, manager):
        manager.setup_dirs()
        rec = manager.recording_path
        rec.touch()

        # Simulate ffmpeg creating a frame file during extraction
        def create_frame_and_return(*args, **kwargs):
            (manager.frames_dir / "F0001.jpg").touch()
            return ("", "[Parsed_showinfo_1 @ 0x1] n:0 pts:1000 pts_time:10.5 stuff\n")

        mock_extract.side_effect = create_frame_and_return

        count, max_ts = manager._extract_new_frames(rec, start_number=1)
        assert count == 1
        assert max_ts == 10.5

        index_path = manager.frames_dir / "index.json"
        with open(index_path) as f:
            index = json.load(f)
        assert len(index) == 1
        assert index[0]["id"] == "F0001"
        assert index[0]["timestamp"] == 10.5

    @patch("cht.stream.manager.ff.extract_scene_frames")
    def test_handles_ffmpeg_failure(self, mock_extract, manager):
        manager.setup_dirs()
        rec = manager.recording_path
        rec.touch()

        mock_extract.side_effect = RuntimeError("ffmpeg died")
        count, max_ts = manager._extract_new_frames(rec)
        assert count == 0

    @patch("cht.stream.manager.ff.extract_scene_frames")
    def test_skips_preexisting_frames(self, mock_extract, manager):
        manager.setup_dirs()
        rec = manager.recording_path
        rec.touch()

        # Pre-existing frame
        (manager.frames_dir / "F0001.jpg").touch()

        # ffmpeg "creates" no new files, just returns showinfo for existing
        stderr = "[Parsed_showinfo_1 @ 0x1] n:0 pts:100 pts_time:5.0 stuff\n"
        mock_extract.return_value = ("", stderr)

        count, _ = manager._extract_new_frames(rec, start_number=1)
        # F0001 already existed before extraction, should not be counted
        assert count == 0


class TestSceneDetector:
    @patch("cht.stream.manager.ff.extract_scene_frames")
    def test_detects_growing_file(self, mock_extract, manager):
        manager.setup_dirs()
        mock_extract.return_value = ("", "")

        # Create recording with some data
        rec = manager.recording_path
        rec.write_bytes(b"\x00" * 200_000)

        manager.start_scene_detector()
        time.sleep(12)  # wait for one cycle
        manager.stop_all()

        mock_extract.assert_called()