"""Tests for task handlers."""

import uuid
from unittest.mock import AsyncMock, MagicMock, patch

import pytest
from sqlmodel.ext.asyncio.session import AsyncSession

from app.models.scheduled_task import ScheduledTask, TaskType
from app.services.task_handlers import TaskExecutionError, TaskHandlerRegistry


class TestTaskHandlerRegistry:
    """Test cases for task handler registry."""

    @pytest.fixture
    def mock_credit_service(self):
        """Create mock credit service."""
        return AsyncMock()

    @pytest.fixture
    def mock_player_service(self):
        """Create mock player service."""
        return MagicMock()

    @pytest.fixture
    def task_registry(
        self,
        db_session: AsyncSession,
        mock_credit_service,
        mock_player_service,
    ) -> TaskHandlerRegistry:
        """Create task handler registry fixture."""
        return TaskHandlerRegistry(
            db_session,
            mock_credit_service,
            mock_player_service,
        )

    async def test_execute_task_unknown_type(
        self,
        task_registry: TaskHandlerRegistry,
    ):
        """Test executing task with unknown type."""
        # Create task with invalid type
        task = ScheduledTask(
            name="Unknown Task",
            task_type="UNKNOWN_TYPE",  # Invalid type
            scheduled_at=datetime.utcnow(),
        )

        with pytest.raises(TaskExecutionError, match="No handler registered"):
            await task_registry.execute_task(task)

    async def test_handle_credit_recharge_all_users(
        self,
        task_registry: TaskHandlerRegistry,
        mock_credit_service,
    ):
        """Test handling credit recharge for all users."""
        task = ScheduledTask(
            name="Daily Credit Recharge",
            task_type=TaskType.CREDIT_RECHARGE,
            scheduled_at=datetime.utcnow(),
            parameters={},
        )

        mock_credit_service.recharge_all_users_credits.return_value = {
            "users_recharged": 10,
            "total_credits": 1000,
        }

        await task_registry.execute_task(task)

        mock_credit_service.recharge_all_users_credits.assert_called_once()

    async def test_handle_credit_recharge_specific_user(
        self,
        task_registry: TaskHandlerRegistry,
        mock_credit_service,
        test_user_id: uuid.UUID,
    ):
        """Test handling credit recharge for specific user."""
        task = ScheduledTask(
            name="User Credit Recharge",
            task_type=TaskType.CREDIT_RECHARGE,
            scheduled_at=datetime.utcnow(),
            parameters={"user_id": str(test_user_id)},
        )

        mock_credit_service.recharge_user_credits.return_value = {
            "user_id": str(test_user_id),
            "credits_added": 100,
        }

        await task_registry.execute_task(task)

        mock_credit_service.recharge_user_credits.assert_called_once_with(test_user_id)

    async def test_handle_credit_recharge_uuid_user_id(
        self,
        task_registry: TaskHandlerRegistry,
        mock_credit_service,
        test_user_id: uuid.UUID,
    ):
        """Test handling credit recharge with UUID user_id parameter."""
        task = ScheduledTask(
            name="User Credit Recharge",
            task_type=TaskType.CREDIT_RECHARGE,
            scheduled_at=datetime.utcnow(),
            parameters={"user_id": test_user_id},  # UUID object instead of string
        )

        await task_registry.execute_task(task)

        mock_credit_service.recharge_user_credits.assert_called_once_with(test_user_id)

    async def test_handle_play_sound_success(
        self,
        task_registry: TaskHandlerRegistry,
        test_sound_id: uuid.UUID,
    ):
        """Test successful play sound task handling."""
        task = ScheduledTask(
            name="Play Sound",
            task_type=TaskType.PLAY_SOUND,
            scheduled_at=datetime.utcnow(),
            parameters={"sound_id": str(test_sound_id)},
        )

        # Mock sound repository
        mock_sound = MagicMock()
        mock_sound.id = test_sound_id
        mock_sound.filename = "test_sound.mp3"

        with patch.object(task_registry.sound_repository, "get_by_id", return_value=mock_sound):
            with patch("app.services.vlc_player.VLCPlayerService") as mock_vlc_class:
                mock_vlc_service = AsyncMock()
                mock_vlc_class.return_value = mock_vlc_service

                await task_registry.execute_task(task)

                task_registry.sound_repository.get_by_id.assert_called_once_with(test_sound_id)
                mock_vlc_service.play_sound.assert_called_once_with(mock_sound)

    async def test_handle_play_sound_missing_sound_id(
        self,
        task_registry: TaskHandlerRegistry,
    ):
        """Test play sound task with missing sound_id parameter."""
        task = ScheduledTask(
            name="Play Sound",
            task_type=TaskType.PLAY_SOUND,
            scheduled_at=datetime.utcnow(),
            parameters={},  # Missing sound_id
        )

        with pytest.raises(TaskExecutionError, match="sound_id parameter is required"):
            await task_registry.execute_task(task)

    async def test_handle_play_sound_invalid_sound_id(
        self,
        task_registry: TaskHandlerRegistry,
    ):
        """Test play sound task with invalid sound_id parameter."""
        task = ScheduledTask(
            name="Play Sound",
            task_type=TaskType.PLAY_SOUND,
            scheduled_at=datetime.utcnow(),
            parameters={"sound_id": "invalid-uuid"},
        )

        with pytest.raises(TaskExecutionError, match="Invalid sound_id format"):
            await task_registry.execute_task(task)

    async def test_handle_play_sound_not_found(
        self,
        task_registry: TaskHandlerRegistry,
        test_sound_id: uuid.UUID,
    ):
        """Test play sound task with non-existent sound."""
        task = ScheduledTask(
            name="Play Sound",
            task_type=TaskType.PLAY_SOUND,
            scheduled_at=datetime.utcnow(),
            parameters={"sound_id": str(test_sound_id)},
        )

        with patch.object(task_registry.sound_repository, "get_by_id", return_value=None):
            with pytest.raises(TaskExecutionError, match="Sound not found"):
                await task_registry.execute_task(task)

    async def test_handle_play_sound_uuid_parameter(
        self,
        task_registry: TaskHandlerRegistry,
        test_sound_id: uuid.UUID,
    ):
        """Test play sound task with UUID parameter (not string)."""
        task = ScheduledTask(
            name="Play Sound",
            task_type=TaskType.PLAY_SOUND,
            scheduled_at=datetime.utcnow(),
            parameters={"sound_id": test_sound_id},  # UUID object
        )

        mock_sound = MagicMock()
        mock_sound.filename = "test_sound.mp3"

        with patch.object(task_registry.sound_repository, "get_by_id", return_value=mock_sound):
            with patch("app.services.vlc_player.VLCPlayerService") as mock_vlc_class:
                mock_vlc_service = AsyncMock()
                mock_vlc_class.return_value = mock_vlc_service

                await task_registry.execute_task(task)

                task_registry.sound_repository.get_by_id.assert_called_once_with(test_sound_id)

    async def test_handle_play_playlist_success(
        self,
        task_registry: TaskHandlerRegistry,
        mock_player_service,
        test_playlist_id: uuid.UUID,
    ):
        """Test successful play playlist task handling."""
        task = ScheduledTask(
            name="Play Playlist",
            task_type=TaskType.PLAY_PLAYLIST,
            scheduled_at=datetime.utcnow(),
            parameters={
                "playlist_id": str(test_playlist_id),
                "play_mode": "loop",
                "shuffle": True,
            },
        )

        # Mock playlist repository
        mock_playlist = MagicMock()
        mock_playlist.id = test_playlist_id
        mock_playlist.name = "Test Playlist"

        with patch.object(task_registry.playlist_repository, "get_by_id", return_value=mock_playlist):
            await task_registry.execute_task(task)

            task_registry.playlist_repository.get_by_id.assert_called_once_with(test_playlist_id)
            mock_player_service.load_playlist.assert_called_once_with(test_playlist_id)
            mock_player_service.set_mode.assert_called_once_with("loop")
            mock_player_service.set_shuffle.assert_called_once_with(True)
            mock_player_service.play.assert_called_once()

    async def test_handle_play_playlist_minimal_parameters(
        self,
        task_registry: TaskHandlerRegistry,
        mock_player_service,
        test_playlist_id: uuid.UUID,
    ):
        """Test play playlist task with minimal parameters."""
        task = ScheduledTask(
            name="Play Playlist",
            task_type=TaskType.PLAY_PLAYLIST,
            scheduled_at=datetime.utcnow(),
            parameters={"playlist_id": str(test_playlist_id)},
        )

        mock_playlist = MagicMock()
        mock_playlist.name = "Test Playlist"

        with patch.object(task_registry.playlist_repository, "get_by_id", return_value=mock_playlist):
            await task_registry.execute_task(task)

            # Should use default values
            mock_player_service.set_mode.assert_called_once_with("continuous")
            mock_player_service.set_shuffle.assert_called_once_with(False)

    async def test_handle_play_playlist_missing_playlist_id(
        self,
        task_registry: TaskHandlerRegistry,
    ):
        """Test play playlist task with missing playlist_id parameter."""
        task = ScheduledTask(
            name="Play Playlist",
            task_type=TaskType.PLAY_PLAYLIST,
            scheduled_at=datetime.utcnow(),
            parameters={},  # Missing playlist_id
        )

        with pytest.raises(TaskExecutionError, match="playlist_id parameter is required"):
            await task_registry.execute_task(task)

    async def test_handle_play_playlist_invalid_playlist_id(
        self,
        task_registry: TaskHandlerRegistry,
    ):
        """Test play playlist task with invalid playlist_id parameter."""
        task = ScheduledTask(
            name="Play Playlist",
            task_type=TaskType.PLAY_PLAYLIST,
            scheduled_at=datetime.utcnow(),
            parameters={"playlist_id": "invalid-uuid"},
        )

        with pytest.raises(TaskExecutionError, match="Invalid playlist_id format"):
            await task_registry.execute_task(task)

    async def test_handle_play_playlist_not_found(
        self,
        task_registry: TaskHandlerRegistry,
        test_playlist_id: uuid.UUID,
    ):
        """Test play playlist task with non-existent playlist."""
        task = ScheduledTask(
            name="Play Playlist",
            task_type=TaskType.PLAY_PLAYLIST,
            scheduled_at=datetime.utcnow(),
            parameters={"playlist_id": str(test_playlist_id)},
        )

        with patch.object(task_registry.playlist_repository, "get_by_id", return_value=None):
            with pytest.raises(TaskExecutionError, match="Playlist not found"):
                await task_registry.execute_task(task)

    async def test_handle_play_playlist_valid_play_modes(
        self,
        task_registry: TaskHandlerRegistry,
        mock_player_service,
        test_playlist_id: uuid.UUID,
    ):
        """Test play playlist task with various valid play modes."""
        mock_playlist = MagicMock()
        mock_playlist.name = "Test Playlist"

        valid_modes = ["continuous", "loop", "loop_one", "random", "single"]

        for mode in valid_modes:
            task = ScheduledTask(
                name="Play Playlist",
                task_type=TaskType.PLAY_PLAYLIST,
                scheduled_at=datetime.utcnow(),
                parameters={
                    "playlist_id": str(test_playlist_id),
                    "play_mode": mode,
                },
            )

            with patch.object(task_registry.playlist_repository, "get_by_id", return_value=mock_playlist):
                await task_registry.execute_task(task)
                mock_player_service.set_mode.assert_called_with(mode)

            # Reset mock for next iteration
            mock_player_service.reset_mock()

    async def test_handle_play_playlist_invalid_play_mode(
        self,
        task_registry: TaskHandlerRegistry,
        mock_player_service,
        test_playlist_id: uuid.UUID,
    ):
        """Test play playlist task with invalid play mode."""
        task = ScheduledTask(
            name="Play Playlist",
            task_type=TaskType.PLAY_PLAYLIST,
            scheduled_at=datetime.utcnow(),
            parameters={
                "playlist_id": str(test_playlist_id),
                "play_mode": "invalid_mode",
            },
        )

        mock_playlist = MagicMock()
        mock_playlist.name = "Test Playlist"

        with patch.object(task_registry.playlist_repository, "get_by_id", return_value=mock_playlist):
            await task_registry.execute_task(task)

            # Should not call set_mode for invalid mode
            mock_player_service.set_mode.assert_not_called()
            # But should still load playlist and play
            mock_player_service.load_playlist.assert_called_once()
            mock_player_service.play.assert_called_once()

    async def test_task_execution_exception_handling(
        self,
        task_registry: TaskHandlerRegistry,
        mock_credit_service,
    ):
        """Test exception handling during task execution."""
        task = ScheduledTask(
            name="Failing Task",
            task_type=TaskType.CREDIT_RECHARGE,
            scheduled_at=datetime.utcnow(),
            parameters={},
        )

        # Make credit service raise an exception
        mock_credit_service.recharge_all_users_credits.side_effect = Exception("Service error")

        with pytest.raises(TaskExecutionError, match="Task execution failed: Service error"):
            await task_registry.execute_task(task)

    async def test_task_registry_initialization(
        self,
        db_session: AsyncSession,
        mock_credit_service,
        mock_player_service,
    ):
        """Test task registry initialization."""
        registry = TaskHandlerRegistry(
            db_session,
            mock_credit_service,
            mock_player_service,
        )

        assert registry.db_session == db_session
        assert registry.credit_service == mock_credit_service
        assert registry.player_service == mock_player_service
        assert registry.sound_repository is not None
        assert registry.playlist_repository is not None

        # Check all handlers are registered
        expected_handlers = {
            TaskType.CREDIT_RECHARGE,
            TaskType.PLAY_SOUND,
            TaskType.PLAY_PLAYLIST,
        }
        assert set(registry._handlers.keys()) == expected_handlers