from unittest.mock import MagicMock, patch

import src.distributed_job_manager as djm_module
from src.distributed_job_manager import DistributedJobManager
from src.utilities.status_utils import RenderStatus


class TestSubscribeToListener:
    """PubSub subscription."""

    def test_subscribes_to_status_change(self, distributed_job_manager_instance):
        distributed_job_manager_instance._subscribe_to_listener()

        # Check via the module-level reference (the one _subscribe_to_listener uses)
        djm_module.pub.subscribe.assert_any_call(
            distributed_job_manager_instance._local_job_status_changed,
            'status_change',
        )
        djm_module.pub.subscribe.assert_any_call(
            distributed_job_manager_instance._local_job_frame_complete,
            'frame_complete',
        )


class TestCreateRenderJob:
    """Creating a render job."""

    @patch('src.distributed_job_manager.os.makedirs')
    @patch('src.distributed_job_manager.EngineManager.create_worker')
    def test_creates_worker_and_adds_to_queue(
        self, mock_create_worker, mock_makedirs, distributed_job_manager_instance,
        config_instance, tmp_path,
    ):
        worker = MagicMock()
        worker.total_frames = 10
        worker.parent = None
        worker.id = 'job-1'
        mock_create_worker.return_value = worker

        project_path = tmp_path / 'test_project.blend'
        project_path.write_text('fake')

        attrs = {
            'engine_name': 'blender',
            'args': {'engine': 'CYCLES'},
            'name': 'Test Job',
            'start_frame': 1,
            'end_frame': 10,
            'priority': 2,
            'enable_split_jobs': False,
        }

        with patch('src.distributed_job_manager.RenderQueue.add_to_render_queue') as mock_add:
            with patch('src.distributed_job_manager.PreviewManager.update_previews_for_job'):
                result = DistributedJobManager.create_render_job(attrs, project_path)

        assert result == worker
        assert worker.status == RenderStatus.NOT_STARTED
        mock_add.assert_called_once_with(worker, force_start=False)

    @patch('src.distributed_job_manager.os.makedirs')
    @patch('src.distributed_job_manager.EngineManager.create_worker')
    def test_split_jobs_enabled_calls_split_async(
        self, mock_create_worker, mock_makedirs, distributed_job_manager_instance,
        config_instance, tmp_path,
    ):
        worker = MagicMock()
        worker.total_frames = 10
        worker.parent = None
        mock_create_worker.return_value = worker

        project_path = tmp_path / 'test_project.blend'
        project_path.write_text('fake')

        attrs = {
            'engine_name': 'blender',
            'args': {},
            'name': 'Split Job',
            'start_frame': 1,
            'end_frame': 10,
            'priority': 2,
            'enable_split_jobs': True,
        }

        # The forwarder passes system_os=None by default
        with patch.object(distributed_job_manager_instance, '_split_into_subjobs_async') as mock_split:
            with patch('src.distributed_job_manager.RenderQueue.add_to_render_queue'):
                with patch('src.distributed_job_manager.PreviewManager.update_previews_for_job'):
                    DistributedJobManager.create_render_job(attrs, project_path)

        mock_split.assert_called_once_with(worker, attrs, project_path, None)


class TestHandleSubjobUpdate:
    """Processing subjob update notifications."""

    def test_updates_child_info(self, distributed_job_manager_instance):
        parent_job = MagicMock()
        parent_job.children = {}

        subjob_data = {
            'id': 'sub-1',
            'hostname': 'worker-1',
            'status': 'completed',
            'percent_complete': 1.0,
            'file_count': 5,
        }

        with patch('src.distributed_job_manager.download_missing_frames_from_subjob',
                   return_value=True):
            DistributedJobManager.handle_subjob_update_notification(parent_job, subjob_data)

        assert 'sub-1@worker-1' in parent_job.children
        assert parent_job.children['sub-1@worker-1']['download_status'] == 'completed'


class TestFindAvailableServers:
    """Discovering remote servers."""

    @patch('src.distributed_job_manager.ZeroconfServer.found_hostnames')
    @patch('src.distributed_job_manager.ZeroconfServer.get_hostname_properties')
    @patch('src.distributed_job_manager.RenderServerProxy')
    def test_finds_matching_server(
        self, mock_proxy_class, mock_get_props, mock_found_hostnames,
    ):
        mock_found_hostnames.return_value = ['server-1.local']
        mock_get_props.return_value = {'api_version': '0.1', 'system_os': 'macos'}

        mock_proxy = MagicMock()
        mock_proxy.is_engine_available.return_value = {
            'available': True,
            'hostname': 'server-1.local',
        }
        mock_proxy_class.return_value = mock_proxy

        result = DistributedJobManager.find_available_servers('blender')
        assert len(result) == 1
        assert result[0]['hostname'] == 'server-1.local'