"""Unit tests for BackgroundLoaderService.

Tests task queuing, status tracking, and worker logic in isolation.
"""
import asyncio
from datetime import datetime
from unittest.mock import AsyncMock, Mock, patch

import pytest

from src.server.services.background_loader_service import (
    BackgroundLoaderService,
    LoadingStatus,
    SeriesLoadingTask,
)


@pytest.fixture
def mock_websocket_service():
    """Mock WebSocket service."""
    service = Mock()
    service.broadcast = AsyncMock()
    return service


@pytest.fixture
def mock_anime_service():
    """Mock anime service."""
    service = Mock()
    service.rescan = AsyncMock()
    return service


@pytest.fixture
def mock_series_app():
    """Mock SeriesApp."""
    app = Mock()
    app.directory_to_search = "/test/anime"
    app.nfo_service = Mock()
    app.nfo_service.create_tvshow_nfo = AsyncMock()
    return app


@pytest.fixture
async def background_loader(mock_websocket_service, mock_anime_service, mock_series_app):
    """Create BackgroundLoaderService instance."""
    service = BackgroundLoaderService(
        websocket_service=mock_websocket_service,
        anime_service=mock_anime_service,
        series_app=mock_series_app
    )
    yield service
    await service.stop()


class TestBackgroundLoaderService:
    """Test suite for BackgroundLoaderService."""

    @pytest.mark.asyncio
    async def test_service_initialization(self, background_loader):
        """Test service initializes correctly."""
        assert background_loader.task_queue is not None
        assert isinstance(background_loader.active_tasks, dict)
        assert len(background_loader.active_tasks) == 0

    @pytest.mark.asyncio
    async def test_start_worker(self, background_loader):
        """Test worker starts successfully."""
        await background_loader.start()
        assert background_loader.worker_task is not None
        assert not background_loader.worker_task.done()

    @pytest.mark.asyncio
    async def test_stop_worker_gracefully(self, background_loader):
        """Test worker stops gracefully."""
        await background_loader.start()
        await background_loader.stop()
        assert background_loader.worker_task.done()

    @pytest.mark.asyncio
    async def test_add_series_loading_task(self, background_loader):
        """Test adding a series to the loading queue."""
        await background_loader.add_series_loading_task(
            key="test-series",
            folder="Test Series",
            name="Test Series",
            year=2024
        )

        # Verify task in active tasks
        assert "test-series" in background_loader.active_tasks
        task = background_loader.active_tasks["test-series"]
        assert task.key == "test-series"
        assert task.status == LoadingStatus.PENDING

    @pytest.mark.asyncio
    async def test_duplicate_task_handling(self, background_loader):
        """Test that duplicate tasks for same series are handled correctly."""
        key = "test-series"

        await background_loader.add_series_loading_task(
            key=key,
            folder="Test Series",
            name="Test Series"
        )
        await background_loader.add_series_loading_task(
            key=key,
            folder="Test Series",
            name="Test Series"
        )

        # Verify only one task exists
        assert len([k for k in background_loader.active_tasks if k == key]) == 1

    @pytest.mark.asyncio
    async def test_check_missing_data_all_missing(
        self,
        background_loader,
        mock_series_app
    ):
        """Test checking for missing data when all data is missing."""
        with patch('src.server.database.service.AnimeSeriesService.get_by_key') as mock_get:
            mock_series = Mock()
            mock_series.episodes_loaded = False
            mock_series.has_nfo = False
            mock_series.logo_loaded = False
            mock_series.images_loaded = False
            mock_get.return_value = mock_series

            mock_db = AsyncMock()

            missing_data = await background_loader.check_missing_data(
                key="test-series",
                folder="Test Series",
                anime_directory="/test/anime",
                db=mock_db
            )

            assert missing_data["episodes"] is True
            assert missing_data["nfo"] is True
            assert missing_data["logo"] is True
            assert missing_data["images"] is True

    @pytest.mark.asyncio
    async def test_broadcast_status(self, background_loader, mock_websocket_service):
        """Test status broadcasting via WebSocket."""
        task = SeriesLoadingTask(
            key="test-series",
            folder="Test Series",
            name="Test Series",
            status=LoadingStatus.LOADING_EPISODES
        )

        await background_loader._broadcast_status(task)

        # Verify broadcast was called
        mock_websocket_service.broadcast.assert_called_once()
        
        # Verify message structure
        call_args = mock_websocket_service.broadcast.call_args[0][0]
        assert call_args["type"] == "series_loading_update"
        assert call_args["key"] == "test-series"
        assert call_args["loading_status"] == "loading_episodes"


class TestSeriesLoadingTask:
    """Test SeriesLoadingTask model."""

    def test_task_initialization(self):
        """Test task initializes with correct defaults."""
        task = SeriesLoadingTask(
            key="test",
            folder="Test",
            name="Test"
        )
        
        assert task.key == "test"
        assert task.status == LoadingStatus.PENDING
        assert not any(task.progress.values())

    def test_task_progress_tracking(self):
        """Test progress tracking updates correctly."""
        task = SeriesLoadingTask(
            key="test",
            folder="Test",
            name="Test"
        )

        task.progress["episodes"] = True
        assert task.progress["episodes"] is True
        assert not task.progress["nfo"]
        assert not task.progress["logo"]
        assert not task.progress["images"]

    def test_loading_status_enum(self):
        """Test LoadingStatus enum values."""
        assert LoadingStatus.PENDING == "pending"
        assert LoadingStatus.LOADING_EPISODES == "loading_episodes"
        assert LoadingStatus.LOADING_NFO == "loading_nfo"
        assert LoadingStatus.COMPLETED == "completed"
        assert LoadingStatus.FAILED == "failed"