"""Tests for MeshCore worker rate limiting functionality."""

import asyncio
import time
from typing import Any, Dict
from unittest.mock import AsyncMock, MagicMock

import pytest

from meshcore_mqtt.config import Config, ConnectionType, MeshCoreConfig, MQTTConfig
from meshcore_mqtt.meshcore_worker import MeshCoreWorker


@pytest.fixture
def test_config() -> Config:
    """Create a test configuration with rate limiting settings."""
    return Config(
        mqtt=MQTTConfig(broker="localhost"),
        meshcore=MeshCoreConfig(
            connection_type=ConnectionType.TCP,
            address="127.0.0.1",
            port=5000,
            message_initial_delay=0.1,  # 100ms for faster tests
            message_send_delay=0.2,  # 200ms for faster tests
        ),
    )


@pytest.fixture
def test_config_zero_delays() -> Config:
    """Create a test configuration with zero delays."""
    return Config(
        mqtt=MQTTConfig(broker="localhost"),
        meshcore=MeshCoreConfig(
            connection_type=ConnectionType.TCP,
            address="127.0.0.1",
            port=5000,
            message_initial_delay=0.0,
            message_send_delay=0.0,
        ),
    )


@pytest.fixture
def mock_meshcore_worker(test_config: Config) -> MeshCoreWorker:
    """Create a MeshCore worker with mocked MeshCore instance."""
    worker = MeshCoreWorker(test_config)

    # Mock the MeshCore instance
    mock_meshcore = MagicMock()
    mock_meshcore.commands = MagicMock()
    mock_meshcore.commands.send_msg = AsyncMock(return_value=MagicMock())
    mock_meshcore.commands.send_chan_msg = AsyncMock(return_value=MagicMock())
    mock_meshcore.commands.send_device_query = AsyncMock(return_value=MagicMock())
    worker.meshcore = mock_meshcore

    return worker


class TestRateLimiting:
    """Test message rate limiting functionality."""

    async def test_message_initial_delay(
        self, mock_meshcore_worker: MeshCoreWorker
    ) -> None:
        """Test that initial delay is applied before the first message."""
        start_time = time.time()

        # Set worker to running state
        mock_meshcore_worker._running = True

        # Queue a message
        command_data = {"destination": "test", "message": "test"}
        future: asyncio.Future[Any] = asyncio.Future()
        message_data = {"command_type": "send_msg", "future": future, **command_data}

        await mock_meshcore_worker._message_queue.put(message_data)

        # Start the rate limiter
        rate_limiter_task = asyncio.create_task(
            mock_meshcore_worker._message_rate_limiter()
        )

        # Wait for the message to be processed
        try:
            await asyncio.wait_for(future, timeout=1.0)
        except asyncio.TimeoutError:
            pass
        finally:
            mock_meshcore_worker._running = False  # Stop the rate limiter
            rate_limiter_task.cancel()
            try:
                await rate_limiter_task
            except asyncio.CancelledError:
                pass

        elapsed_time = time.time() - start_time

        # Should take at least the initial delay time
        assert (
            elapsed_time >= mock_meshcore_worker.config.meshcore.message_initial_delay
        )

    async def test_message_send_delay(
        self, mock_meshcore_worker: MeshCoreWorker
    ) -> None:
        """Test that delay is applied between consecutive messages."""
        # Set worker to running state
        mock_meshcore_worker._running = True

        # Set the last message time to simulate a previous message
        mock_meshcore_worker._last_message_time = time.time()

        start_time = time.time()

        # Queue a message
        command_data = {"destination": "test", "message": "test"}
        future: asyncio.Future[Any] = asyncio.Future()
        message_data = {"command_type": "send_msg", "future": future, **command_data}

        await mock_meshcore_worker._message_queue.put(message_data)

        # Start the rate limiter
        rate_limiter_task = asyncio.create_task(
            mock_meshcore_worker._message_rate_limiter()
        )

        # Wait for the message to be processed
        try:
            await asyncio.wait_for(future, timeout=1.0)
        except asyncio.TimeoutError:
            pass
        finally:
            mock_meshcore_worker._running = False  # Stop the rate limiter
            rate_limiter_task.cancel()
            try:
                await rate_limiter_task
            except asyncio.CancelledError:
                pass

        elapsed_time = time.time() - start_time

        # Should take at least the send delay time
        assert elapsed_time >= mock_meshcore_worker.config.meshcore.message_send_delay

    async def test_no_delay_with_zero_config(
        self, test_config_zero_delays: Config
    ) -> None:
        """Test that no delays are applied when configured to zero."""
        worker = MeshCoreWorker(test_config_zero_delays)

        # Mock the MeshCore instance
        mock_meshcore = MagicMock()
        mock_meshcore.commands = MagicMock()
        mock_meshcore.commands.send_msg = AsyncMock(return_value=MagicMock())
        worker.meshcore = mock_meshcore

        # Set worker to running state
        worker._running = True

        start_time = time.time()

        # Queue a message
        command_data = {"destination": "test", "message": "test"}
        future: asyncio.Future[Any] = asyncio.Future()
        message_data = {"command_type": "send_msg", "future": future, **command_data}

        await worker._message_queue.put(message_data)

        # Start the rate limiter
        rate_limiter_task = asyncio.create_task(worker._message_rate_limiter())

        # Wait for the message to be processed
        try:
            await asyncio.wait_for(future, timeout=0.5)
        except asyncio.TimeoutError:
            pass
        finally:
            worker._running = False  # Stop the rate limiter
            rate_limiter_task.cancel()
            try:
                await rate_limiter_task
            except asyncio.CancelledError:
                pass

        elapsed_time = time.time() - start_time

        # Should complete quickly with no delays
        assert elapsed_time < 0.1

    async def test_rate_limited_command_execution(
        self, mock_meshcore_worker: MeshCoreWorker
    ) -> None:
        """Test that rate-limited commands are executed correctly."""
        # Test send_msg command
        await mock_meshcore_worker._execute_rate_limited_message(
            {
                "command_type": "send_msg",
                "destination": "test_user",
                "message": "Hello",
                "future": None,
            }
        )

        # Verify the command was called
        assert mock_meshcore_worker.meshcore is not None
        mock_meshcore_worker.meshcore.commands.send_msg.assert_called_once_with(
            "test_user", "Hello"
        )

        # Test send_chan_msg command
        await mock_meshcore_worker._execute_rate_limited_message(
            {
                "command_type": "send_chan_msg",
                "channel": 0,
                "message": "Hello channel",
                "future": None,
            }
        )

        # Verify the command was called
        assert mock_meshcore_worker.meshcore is not None
        mock_meshcore_worker.meshcore.commands.send_chan_msg.assert_called_once_with(
            0, "Hello channel"
        )

    async def test_queue_rate_limited_command(
        self, mock_meshcore_worker: MeshCoreWorker
    ) -> None:
        """Test queuing and execution of rate-limited commands."""
        # Set worker to running state
        mock_meshcore_worker._running = True

        # Start the rate limiter in the background
        rate_limiter_task = asyncio.create_task(
            mock_meshcore_worker._message_rate_limiter()
        )

        try:
            # Queue a command
            command_data = {"destination": "test_user", "message": "Hello"}
            result_task = asyncio.create_task(
                mock_meshcore_worker._queue_rate_limited_command(
                    "send_msg", command_data
                )
            )

            # Wait for completion
            await asyncio.wait_for(result_task, timeout=2.0)

            # Verify the command was executed
            assert mock_meshcore_worker.meshcore is not None
            mock_meshcore_worker.meshcore.commands.send_msg.assert_called_once_with(
                "test_user", "Hello"
            )

        finally:
            mock_meshcore_worker._running = False  # Stop the rate limiter
            rate_limiter_task.cancel()
            try:
                await rate_limiter_task
            except asyncio.CancelledError:
                pass

    async def test_multiple_messages_rate_limiting(
        self, mock_meshcore_worker: MeshCoreWorker
    ) -> None:
        """Test that multiple messages are properly rate limited."""
        # Set worker to running state
        mock_meshcore_worker._running = True

        # Start the rate limiter
        rate_limiter_task = asyncio.create_task(
            mock_meshcore_worker._message_rate_limiter()
        )

        try:
            start_time = time.time()

            # Queue multiple messages
            tasks = []
            for i in range(3):
                command_data = {"destination": f"user{i}", "message": f"Message {i}"}
                task = asyncio.create_task(
                    mock_meshcore_worker._queue_rate_limited_command(
                        "send_msg", command_data
                    )
                )
                tasks.append(task)

            # Wait for all messages to complete
            await asyncio.gather(*tasks)

            elapsed_time = time.time() - start_time

            # Should take at least initial_delay + 2 * send_delay for 3 messages
            expected_min_time = (
                mock_meshcore_worker.config.meshcore.message_initial_delay
                + 2 * mock_meshcore_worker.config.meshcore.message_send_delay
            )
            assert elapsed_time >= expected_min_time

            # Verify all commands were executed
            assert mock_meshcore_worker.meshcore is not None
            assert mock_meshcore_worker.meshcore.commands.send_msg.call_count == 3

        finally:
            mock_meshcore_worker._running = False  # Stop the rate limiter
            rate_limiter_task.cancel()
            try:
                await rate_limiter_task
            except asyncio.CancelledError:
                pass

    async def test_rate_limiter_restart_resets_timing(
        self, mock_meshcore_worker: MeshCoreWorker
    ) -> None:
        """Test that rate limiter resets timing when worker starts."""
        # Simulate previous message time (as if from previous session)
        mock_meshcore_worker._last_message_time = time.time() - 3600  # 1 hour ago

        # Simulate the worker start behavior that resets timing
        # (without actually connecting to avoid test dependencies)
        mock_meshcore_worker._running = True
        mock_meshcore_worker._last_message_time = (
            None  # This simulates the start() reset
        )

        # Start the rate limiter
        rate_limiter_task = asyncio.create_task(
            mock_meshcore_worker._message_rate_limiter()
        )

        try:
            start_time = time.time()

            # Queue a message - should apply initial delay, not skip due to old timing
            command_data = {"destination": "test_user", "message": "Hello"}
            result_task = asyncio.create_task(
                mock_meshcore_worker._queue_rate_limited_command(
                    "send_msg", command_data
                )
            )

            # Wait for completion
            await asyncio.wait_for(result_task, timeout=2.0)

            elapsed_time = time.time() - start_time

            # Should take at least the initial delay time
            assert (
                elapsed_time
                >= mock_meshcore_worker.config.meshcore.message_initial_delay
            )

            # Verify the command was executed
            assert mock_meshcore_worker.meshcore is not None
            mock_meshcore_worker.meshcore.commands.send_msg.assert_called_once_with(
                "test_user", "Hello"
            )

        finally:
            mock_meshcore_worker._running = False
            rate_limiter_task.cancel()
            try:
                await rate_limiter_task
            except asyncio.CancelledError:
                pass

    async def test_rate_limiter_error_handling(
        self, mock_meshcore_worker: MeshCoreWorker
    ) -> None:
        """Test error handling in rate-limited message execution."""
        # Set worker to running state
        mock_meshcore_worker._running = True

        # Make the mock command raise an exception - bypass the retry logic
        # So we'll make it raise an exception in _execute_rate_limited_message
        original_execute = mock_meshcore_worker._execute_rate_limited_message

        async def mock_execute(message_data: Dict[str, Any]) -> None:
            future = message_data.get("future")
            if future and not future.done():
                future.set_exception(Exception("Test error"))

        # Use setattr to avoid mypy error about method assignment
        setattr(mock_meshcore_worker, "_execute_rate_limited_message", mock_execute)

        # Start the rate limiter
        rate_limiter_task = asyncio.create_task(
            mock_meshcore_worker._message_rate_limiter()
        )

        try:
            # Queue a command that will fail
            command_data = {"destination": "test_user", "message": "Hello"}

            with pytest.raises(Exception, match="Test error"):
                await asyncio.wait_for(
                    mock_meshcore_worker._queue_rate_limited_command(
                        "send_msg", command_data
                    ),
                    timeout=2.0,
                )

        finally:
            mock_meshcore_worker._running = False  # Stop the rate limiter
            # Restore original method
            setattr(
                mock_meshcore_worker, "_execute_rate_limited_message", original_execute
            )
            rate_limiter_task.cancel()
            try:
                await rate_limiter_task
            except asyncio.CancelledError:
                pass

    async def test_configuration_validation(self) -> None:
        """Test that rate limiting configuration is properly validated."""
        # Test valid configuration
        config = Config(
            mqtt=MQTTConfig(broker="localhost"),
            meshcore=MeshCoreConfig(
                connection_type=ConnectionType.TCP,
                address="127.0.0.1",
                message_initial_delay=5.0,
                message_send_delay=10.0,
            ),
        )
        assert config.meshcore.message_initial_delay == 5.0
        assert config.meshcore.message_send_delay == 10.0

        # Test that values are within valid range
        config = Config(
            mqtt=MQTTConfig(broker="localhost"),
            meshcore=MeshCoreConfig(
                connection_type=ConnectionType.TCP,
                address="127.0.0.1",
                message_initial_delay=0.0,  # Minimum
                message_send_delay=60.0,  # Maximum
            ),
        )
        assert config.meshcore.message_initial_delay == 0.0
        assert config.meshcore.message_send_delay == 60.0

        # Test that invalid values raise validation errors
        with pytest.raises(Exception):
            Config(
                mqtt=MQTTConfig(broker="localhost"),
                meshcore=MeshCoreConfig(
                    connection_type=ConnectionType.TCP,
                    address="127.0.0.1",
                    message_initial_delay=-1.0,  # Invalid: negative
                ),
            )

        with pytest.raises(Exception):
            Config(
                mqtt=MQTTConfig(broker="localhost"),
                meshcore=MeshCoreConfig(
                    connection_type=ConnectionType.TCP,
                    address="127.0.0.1",
                    message_send_delay=61.0,  # Invalid: too large
                ),
            )