"""Tests for WebSocket trade stream handler."""

import asyncio
import json
from decimal import Decimal
from unittest.mock import AsyncMock, patch

import pytest

from polymarket_insider_tracker.ingestor.models import TradeEvent
from polymarket_insider_tracker.ingestor.websocket import (
    ConnectionState,
    StreamStats,
    TradeStreamHandler,
)


class TestStreamStats:
    """Tests for StreamStats."""

    def test_defaults(self) -> None:
        """Test default values."""
        stats = StreamStats()

        assert stats.trades_received == 0
        assert stats.reconnect_count == 0
        assert stats.last_trade_time is None
        assert stats.connected_since is None
        assert stats.last_error is None


class TestTradeStreamHandler:
    """Tests for TradeStreamHandler."""

    @pytest.fixture
    def on_trade_mock(self) -> AsyncMock:
        """Create mock trade callback."""
        return AsyncMock()

    @pytest.fixture
    def on_state_change_mock(self) -> AsyncMock:
        """Create mock state change callback."""
        return AsyncMock()

    @pytest.fixture
    def handler(
        self, on_trade_mock: AsyncMock, on_state_change_mock: AsyncMock
    ) -> TradeStreamHandler:
        """Create handler with mocks."""
        return TradeStreamHandler(
            on_trade=on_trade_mock,
            on_state_change=on_state_change_mock,
            initial_reconnect_delay=0.01,  # Fast reconnect for tests
            max_reconnect_delay=0.1,
        )

    def test_init_defaults(self, on_trade_mock: AsyncMock) -> None:
        """Test handler initialization with defaults."""
        handler = TradeStreamHandler(on_trade=on_trade_mock)

        assert handler.state == ConnectionState.DISCONNECTED
        assert handler.stats.trades_received == 0
        assert handler._host == "wss://ws-live-data.polymarket.com"

    def test_init_custom_host(self, on_trade_mock: AsyncMock) -> None:
        """Test handler with custom host."""
        handler = TradeStreamHandler(
            on_trade=on_trade_mock,
            host="wss://custom.example.com",
        )

        assert handler._host == "wss://custom.example.com"

    def test_init_with_event_filter(self, on_trade_mock: AsyncMock) -> None:
        """Test handler with event filter."""
        handler = TradeStreamHandler(
            on_trade=on_trade_mock,
            event_filter="presidential-election-2024",
        )

        assert handler._event_filter == "presidential-election-2024"

    def test_build_subscription_message_no_filter(self, handler: TradeStreamHandler) -> None:
        """Test building subscription message without filters."""
        msg = handler._build_subscription_message()

        assert msg == {"subscriptions": [{"topic": "activity", "type": "trades"}]}

    def test_build_subscription_message_with_event_filter(self, on_trade_mock: AsyncMock) -> None:
        """Test building subscription message with event filter."""
        handler = TradeStreamHandler(
            on_trade=on_trade_mock,
            event_filter="test-event",
        )
        msg = handler._build_subscription_message()

        assert msg["subscriptions"][0]["filters"] == json.dumps({"event_slug": "test-event"})

    def test_build_subscription_message_with_market_filter(self, on_trade_mock: AsyncMock) -> None:
        """Test building subscription message with market filter."""
        handler = TradeStreamHandler(
            on_trade=on_trade_mock,
            market_filter="test-market",
        )
        msg = handler._build_subscription_message()

        assert msg["subscriptions"][0]["filters"] == json.dumps({"market_slug": "test-market"})

    @pytest.mark.asyncio
    async def test_handle_message_trade(
        self, handler: TradeStreamHandler, on_trade_mock: AsyncMock
    ) -> None:
        """Test handling a valid trade message."""
        message = json.dumps(
            {
                "topic": "activity",
                "type": "trades",
                "payload": {
                    "conditionId": "0xmarket",
                    "transactionHash": "0xtx",
                    "proxyWallet": "0xwallet",
                    "side": "BUY",
                    "outcome": "Yes",
                    "price": 0.65,
                    "size": 100,
                    "timestamp": 1704067200,
                    "asset": "token123",
                },
            }
        )

        await handler._handle_message(message)

        on_trade_mock.assert_called_once()
        trade: TradeEvent = on_trade_mock.call_args[0][0]
        assert trade.market_id == "0xmarket"
        assert trade.side == "BUY"
        assert trade.price == Decimal("0.65")
        assert handler.stats.trades_received == 1

    @pytest.mark.asyncio
    async def test_handle_message_non_trade(
        self, handler: TradeStreamHandler, on_trade_mock: AsyncMock
    ) -> None:
        """Test handling a non-trade message."""
        message = json.dumps(
            {
                "topic": "comments",
                "type": "comment_created",
                "payload": {"body": "Hello"},
            }
        )

        await handler._handle_message(message)

        on_trade_mock.assert_not_called()
        assert handler.stats.trades_received == 0

    @pytest.mark.asyncio
    async def test_handle_message_invalid_json(
        self, handler: TradeStreamHandler, on_trade_mock: AsyncMock
    ) -> None:
        """Test handling invalid JSON message."""
        await handler._handle_message("not valid json")

        on_trade_mock.assert_not_called()
        assert handler.stats.trades_received == 0

    @pytest.mark.asyncio
    async def test_handle_message_callback_error(
        self, handler: TradeStreamHandler, on_trade_mock: AsyncMock
    ) -> None:
        """Test that callback errors don't crash the handler."""
        on_trade_mock.side_effect = ValueError("Callback error")

        message = json.dumps(
            {
                "topic": "activity",
                "type": "trades",
                "payload": {
                    "conditionId": "0x",
                    "transactionHash": "0x",
                    "proxyWallet": "0x",
                    "side": "BUY",
                    "price": 0.5,
                    "size": 10,
                },
            }
        )

        # Should not raise
        await handler._handle_message(message)

        # Trade was still counted
        assert handler.stats.trades_received == 1

    @pytest.mark.asyncio
    async def test_set_state_calls_callback(
        self, handler: TradeStreamHandler, on_state_change_mock: AsyncMock
    ) -> None:
        """Test that state changes trigger callback."""
        await handler._set_state(ConnectionState.CONNECTING)

        on_state_change_mock.assert_called_once_with(ConnectionState.CONNECTING)
        assert handler.state == ConnectionState.CONNECTING

    @pytest.mark.asyncio
    async def test_set_state_same_state_no_callback(
        self, handler: TradeStreamHandler, on_state_change_mock: AsyncMock
    ) -> None:
        """Test that same state doesn't trigger callback."""
        handler._state = ConnectionState.CONNECTED

        await handler._set_state(ConnectionState.CONNECTED)

        on_state_change_mock.assert_not_called()

    @pytest.mark.asyncio
    async def test_stop_when_not_running(self, handler: TradeStreamHandler) -> None:
        """Test stop when handler is not running."""
        # Should not raise
        await handler.stop()

    @pytest.mark.asyncio
    async def test_connect_sends_subscription(
        self,
        handler: TradeStreamHandler,
        on_state_change_mock: AsyncMock,  # noqa: ARG002
    ) -> None:
        """Test that connection sends subscription message."""
        mock_ws = AsyncMock()
        mock_ws.send = AsyncMock()

        with patch("websockets.connect", AsyncMock(return_value=mock_ws)):
            ws = await handler._connect()

            assert ws is mock_ws
            mock_ws.send.assert_called_once()

            # Verify subscription message
            sent_msg = json.loads(mock_ws.send.call_args[0][0])
            assert "subscriptions" in sent_msg
            assert sent_msg["subscriptions"][0]["topic"] == "activity"
            assert sent_msg["subscriptions"][0]["type"] == "trades"

    @pytest.mark.asyncio
    async def test_cleanup_closes_websocket(self, handler: TradeStreamHandler) -> None:
        """Test that cleanup closes the WebSocket."""
        mock_ws = AsyncMock()
        mock_ws.close = AsyncMock()
        handler._ws = mock_ws

        await handler._cleanup()

        mock_ws.close.assert_called_once()
        assert handler._ws is None
        assert handler.state == ConnectionState.DISCONNECTED

    @pytest.mark.asyncio
    async def test_context_manager(self, on_trade_mock: AsyncMock) -> None:
        """Test async context manager."""
        handler = TradeStreamHandler(on_trade=on_trade_mock)

        async with handler:
            pass

        # Should be stopped after exiting context
        assert handler._running is False


class TestTradeStreamHandlerIntegration:
    """Integration tests for TradeStreamHandler.

    These tests verify the full message flow with mocked WebSocket.
    """

    @pytest.mark.asyncio
    async def test_start_and_receive_trades(self) -> None:
        """Test starting handler and receiving trades."""
        received_trades: list[TradeEvent] = []

        async def on_trade(trade: TradeEvent) -> None:
            received_trades.append(trade)

        handler = TradeStreamHandler(
            on_trade=on_trade,
            initial_reconnect_delay=0.01,
        )

        trade_message = json.dumps(
            {
                "topic": "activity",
                "type": "trades",
                "payload": {
                    "conditionId": "0xtest",
                    "transactionHash": "0xtx",
                    "proxyWallet": "0xwallet",
                    "side": "BUY",
                    "outcome": "Yes",
                    "price": 0.75,
                    "size": 50,
                    "timestamp": 1704067200,
                    "asset": "token",
                },
            }
        )

        # Create a proper async iterable mock WebSocket
        class MockWebSocket:
            """Mock WebSocket that yields one message then stops."""

            def __init__(self, handler: TradeStreamHandler, message: str):
                self.handler = handler
                self.message = message
                self.sent = False

            async def send(self, _msg: str) -> None:
                pass

            async def close(self) -> None:
                pass

            def __aiter__(self):
                return self

            async def __anext__(self) -> str:
                if not self.sent:
                    self.sent = True
                    return self.message
                # Stop the handler and raise StopAsyncIteration
                await self.handler.stop()
                raise StopAsyncIteration

        mock_ws = MockWebSocket(handler, trade_message)

        with patch("websockets.connect", AsyncMock(return_value=mock_ws)):
            # Run with timeout to prevent hanging
            try:
                await asyncio.wait_for(handler.start(), timeout=1.0)
            except TimeoutError:
                await handler.stop()

        # Verify trade was received
        assert len(received_trades) == 1
        assert received_trades[0].market_id == "0xtest"
        assert received_trades[0].side == "BUY"
        assert received_trades[0].price == Decimal("0.75")