"""Integration tests for the full candle-serving flow."""

import pytest
import tempfile
import os
from unittest.mock import AsyncMock, MagicMock, patch

from exchange_data_manager.cache.manager import CacheManager
from exchange_data_manager.candles.models import Candle, CandleRequest, RequestMode
from exchange_data_manager.config import CacheConfig, DatabaseConfig
from exchange_data_manager.sessions import SessionManager, Session, ExchangeCredentials


def make_candle(time: int, close: float = 50000.0) -> Candle:
    """Helper to create candles."""
    return Candle(
        time=time,
        open=close - 50,
        high=close + 100,
        low=close - 100,
        close=close,
        volume=10.0,
    )


class MockConnector:
    """Mock exchange connector for integration tests."""

    def __init__(self):
        self.fetch_candles = AsyncMock(return_value=[])
        self.close = AsyncMock()

    def get_timeframes(self):
        return ["1m", "5m", "1h", "1d"]

    async def get_symbols(self):
        return ["BTC/USDT", "ETH/USDT"]


class TestCacheManagerIntegration:
    """Integration tests for CacheManager with all components."""

    @pytest.fixture
    def cache_manager(self):
        """Create a cache manager with temp database."""
        with tempfile.TemporaryDirectory() as tmpdir:
            db_path = os.path.join(tmpdir, "test.db")
            cache_config = CacheConfig(
                fill_gaps=True,
                forward_fill_volume=True,
                time_tolerance_seconds=5,
                count_tolerance=1,
            )
            db_config = DatabaseConfig(path=db_path)

            manager = CacheManager(
                cache_config=cache_config,
                database_config=db_config,
                use_async_db=False,  # Sync for simpler testing
            )
            yield manager

    @pytest.mark.asyncio
    async def test_cold_cache_fetches_from_exchange(self, cache_manager):
        """Test that cold cache fetches from exchange."""
        mock_connector = MockConnector()
        mock_connector.fetch_candles.return_value = [
            make_candle(1709337600),
            make_candle(1709337660),
            make_candle(1709337720),
        ]
        cache_manager.register_exchange("binance", mock_connector)

        request = CandleRequest(
            exchange="binance",
            symbol="BTC/USDT",
            timeframe="1m",
            limit=100,
        )

        result = await cache_manager.get_candles(request)

        assert len(result) == 3
        mock_connector.fetch_candles.assert_called_once()

    @pytest.mark.asyncio
    @patch("exchange_data_manager.cache.memory.time.time")
    async def test_warm_cache_uses_memory(self, mock_time, cache_manager):
        """Test that warm cache uses memory instead of exchange when limit is satisfied."""
        # Mock time to be close to test candle timestamps (prevents freshness check)
        mock_time.return_value = 1709337720  # Just after the second candle

        mock_connector = MockConnector()
        mock_connector.fetch_candles.return_value = [
            make_candle(1709337600),
            make_candle(1709337660),
        ]
        cache_manager.register_exchange("binance", mock_connector)

        # Request exactly 2 candles - matches what memory will have after first call
        # (If we requested more, the cache manager would refetch since memory has fewer)
        request = CandleRequest(
            exchange="binance",
            symbol="BTC/USDT",
            timeframe="1m",
            limit=2,
        )

        # First call - cold cache
        await cache_manager.get_candles(request)
        assert mock_connector.fetch_candles.call_count == 1

        # Second call - should use memory (has 2 candles, requested 2)
        result = await cache_manager.get_candles(request)
        assert len(result) == 2
        assert mock_connector.fetch_candles.call_count == 1  # No additional call

    @pytest.mark.asyncio
    async def test_gap_filling_applied(self, cache_manager):
        """Test that gap filling is applied to results."""
        mock_connector = MockConnector()
        # Data with a gap
        mock_connector.fetch_candles.return_value = [
            make_candle(1709337600),  # 0:00
            # Gap: 0:01
            make_candle(1709337720),  # 0:02
        ]
        cache_manager.register_exchange("binance", mock_connector)

        request = CandleRequest(
            exchange="binance",
            symbol="BTC/USDT",
            timeframe="1m",
            limit=100,
        )

        result = await cache_manager.get_candles(request)

        # Should have 3 candles after gap filling
        assert len(result) == 3
        assert result[1].time == 1709337660  # Filled gap

    @pytest.mark.asyncio
    async def test_range_mode_request(self, cache_manager):
        """Test RANGE mode request with start and end."""
        mock_connector = MockConnector()
        mock_connector.fetch_candles.return_value = [
            make_candle(1709337600),
            make_candle(1709337660),
            make_candle(1709337720),
        ]
        cache_manager.register_exchange("binance", mock_connector)

        request = CandleRequest(
            exchange="binance",
            symbol="BTC/USDT",
            timeframe="1m",
            start=1709337600,
            end=1709337720,
        )

        assert request.mode == RequestMode.RANGE

        result = await cache_manager.get_candles(request)
        assert len(result) == 3

    @pytest.mark.asyncio
    async def test_stats_includes_all_components(self, cache_manager):
        """Test that stats includes memory, database, and exchanges."""
        mock_connector = MockConnector()
        cache_manager.register_exchange("binance", mock_connector)

        stats = await cache_manager.stats()

        assert "memory" in stats
        assert "database" in stats
        assert "registered_exchanges" in stats
        assert "binance" in stats["registered_exchanges"]


class TestSessionLifecycleIntegration:
    """Integration tests for session lifecycle."""

    @pytest.fixture
    def session_manager(self):
        """Create a session manager."""
        return SessionManager(
            session_timeout_minutes=60,
            cleanup_interval_seconds=300,
        )

    @pytest.mark.asyncio
    async def test_full_session_lifecycle(self, session_manager):
        """Test create → add creds → use → destroy → creds gone."""
        # Create session
        session = session_manager.create_session()
        assert session is not None
        assert session.id in session_manager._sessions

        # Add credentials
        success = await session_manager.add_exchange_credentials(
            session_id=session.id,
            exchange="binance",
            api_key="test_key",
            api_secret="test_secret",
        )
        assert success is True
        assert session.has_credentials("binance")

        # Refresh session
        success = session_manager.refresh_session(session.id)
        assert success is True

        # Destroy session
        destroyed = await session_manager.destroy_session(session.id)
        assert destroyed is True

        # Verify session is gone
        assert session.id not in session_manager._sessions
        assert len(session.credentials) == 0

    @pytest.mark.asyncio
    async def test_session_cleanup_on_stop(self, session_manager):
        """Test that all sessions are cleaned up on stop."""
        session1 = session_manager.create_session()
        session2 = session_manager.create_session()

        await session_manager.add_exchange_credentials(
            session1.id, "binance", "key1", "secret1"
        )
        await session_manager.add_exchange_credentials(
            session2.id, "kucoin", "key2", "secret2"
        )

        await session_manager.start()
        await session_manager.stop()

        assert len(session_manager._sessions) == 0

    @pytest.mark.asyncio
    async def test_credential_replacement_closes_old_connector(self):
        """Test that replacing credentials closes the old connector."""
        session = Session()

        # Add initial credentials
        await session.add_credentials(
            "binance",
            ExchangeCredentials(api_key="key1", api_secret="secret1"),
        )

        # Create a mock connector
        mock_connector = MagicMock()
        mock_connector.close = AsyncMock()
        session._connectors["binance"] = mock_connector

        # Replace credentials
        await session.add_credentials(
            "binance",
            ExchangeCredentials(api_key="key2", api_secret="secret2"),
        )

        # Old connector should have been closed
        mock_connector.close.assert_called_once()


class TestRequestModeIntegration:
    """Integration tests for different request modes."""

    @pytest.fixture
    def cache_manager(self):
        """Create a cache manager."""
        return CacheManager(use_async_db=False)

    @pytest.mark.asyncio
    async def test_last_n_mode(self, cache_manager):
        """Test LAST_N mode fetches most recent candles."""
        mock_connector = MockConnector()
        mock_connector.fetch_candles.return_value = [
            make_candle(1709337600 + i * 60) for i in range(50)
        ]
        cache_manager.register_exchange("binance", mock_connector)

        request = CandleRequest(
            exchange="binance",
            symbol="BTC/USDT",
            timeframe="1m",
            limit=50,
        )

        assert request.mode == RequestMode.LAST_N

        result = await cache_manager.get_candles(request)
        assert len(result) == 50

    @pytest.mark.asyncio
    async def test_since_mode(self, cache_manager):
        """Test SINCE mode fetches from start to now."""
        mock_connector = MockConnector()
        mock_connector.fetch_candles.return_value = [
            make_candle(1709337600),
            make_candle(1709337660),
        ]
        cache_manager.register_exchange("binance", mock_connector)

        request = CandleRequest(
            exchange="binance",
            symbol="BTC/USDT",
            timeframe="1m",
            start=1709337600,
        )

        assert request.mode == RequestMode.SINCE

    @pytest.mark.asyncio
    async def test_open_mode(self, cache_manager):
        """Test OPEN mode with no parameters."""
        mock_connector = MockConnector()
        mock_connector.fetch_candles.return_value = [
            make_candle(1709337600),
        ]
        cache_manager.register_exchange("binance", mock_connector)

        request = CandleRequest(
            exchange="binance",
            symbol="BTC/USDT",
            timeframe="1m",
        )

        assert request.mode == RequestMode.OPEN


class TestEpochTimestampHandling:
    """Integration tests for Unix epoch (0) timestamp handling."""

    @pytest.fixture
    def cache_manager(self):
        """Create a cache manager."""
        return CacheManager(use_async_db=False)

    @pytest.mark.asyncio
    async def test_epoch_start_timestamp(self, cache_manager):
        """Test that start=0 (Unix epoch) works correctly."""
        mock_connector = MockConnector()
        mock_connector.fetch_candles.return_value = [
            make_candle(0),  # Epoch
            make_candle(60),
        ]
        cache_manager.register_exchange("binance", mock_connector)

        request = CandleRequest(
            exchange="binance",
            symbol="BTC/USDT",
            timeframe="1m",
            start=0,
            end=60,
        )

        # Should be RANGE mode (start=0 is not None)
        assert request.mode == RequestMode.RANGE
        assert request.start_ms == 0

        result = await cache_manager.get_candles(request)
        # Should not crash due to truthiness issues
        assert len(result) >= 0

    def test_ms_conversion_with_zero(self):
        """Test that zero converts correctly to ms."""
        request = CandleRequest(
            exchange="binance",
            symbol="BTC/USDT",
            timeframe="1m",
            start=0,
            end=0,
        )

        assert request.start_ms == 0
        assert request.end_ms == 0