"""Tests for the generic CCXTConnector."""

import asyncio
import pytest
from unittest.mock import AsyncMock, MagicMock, patch

from exchange_data_manager.exchanges import CCXTConnector, create_connector
from exchange_data_manager.candles.models import Candle


class TestCCXTConnectorInit:
    """Test CCXTConnector initialization."""

    def test_valid_exchange(self):
        """Test creating connector for valid exchange."""
        connector = CCXTConnector("binance")
        assert connector.exchange_id == "binance"
        assert connector.name == "binance"

    def test_invalid_exchange_raises(self):
        """Test that invalid exchange raises ValueError."""
        with pytest.raises(ValueError) as exc_info:
            CCXTConnector("not_a_real_exchange")
        assert "not supported by ccxt" in str(exc_info.value)

    def test_exchange_case_insensitive(self):
        """Test that exchange names are case-insensitive."""
        connector = CCXTConnector("BINANCE")
        assert connector.exchange_id == "binance"

    def test_with_credentials(self):
        """Test creating authenticated connector."""
        connector = CCXTConnector(
            "binance",
            api_key="test_key",
            api_secret="test_secret",
        )
        assert connector.is_authenticated

    def test_with_password(self):
        """Test creating connector with passphrase (for KuCoin etc.)."""
        connector = CCXTConnector(
            "kucoin",
            api_key="test_key",
            api_secret="test_secret",
            password="test_passphrase",
        )
        assert connector.password == "test_passphrase"


class TestCCXTConnectorStaticMethods:
    """Test static utility methods."""

    def test_list_exchanges(self):
        """Test listing available exchanges."""
        exchanges = CCXTConnector.list_exchanges()
        assert "binance" in exchanges
        assert "kraken" in exchanges
        assert "kucoin" in exchanges
        assert len(exchanges) > 50  # ccxt supports 100+ exchanges

    def test_is_exchange_supported_true(self):
        """Test checking valid exchange."""
        assert CCXTConnector.is_exchange_supported("binance") is True
        assert CCXTConnector.is_exchange_supported("KRAKEN") is True

    def test_is_exchange_supported_false(self):
        """Test checking invalid exchange."""
        assert CCXTConnector.is_exchange_supported("not_real") is False


class TestCCXTConnectorFetchCandles:
    """Test candle fetching."""

    @pytest.fixture
    def connector(self):
        """Create a binance connector with mocked client."""
        connector = CCXTConnector("binance")
        return connector

    @pytest.mark.asyncio
    async def test_fetch_candles_basic(self, connector):
        """Test basic candle fetching."""
        # Mock the ccxt client
        connector.client.fetch_ohlcv = AsyncMock(return_value=[
            [1709337600000, 50000.0, 50100.0, 49900.0, 50050.0, 100.0],
            [1709337660000, 50050.0, 50150.0, 49950.0, 50100.0, 150.0],
        ])
        connector.client.load_markets = AsyncMock()
        connector.client.markets = {"BTC/USDT": {}}

        candles = await connector.fetch_candles("BTC/USDT", "1m", limit=100)

        assert len(candles) == 2
        assert candles[0].time == 1709337600
        assert candles[0].close == 50050.0
        assert candles[1].time == 1709337660

    @pytest.mark.asyncio
    async def test_fetch_candles_with_time_range(self, connector):
        """Test fetching candles with start/end times."""
        connector.client.fetch_ohlcv = AsyncMock(return_value=[
            [1709337600000, 50000.0, 50100.0, 49900.0, 50050.0, 100.0],
        ])
        connector.client.load_markets = AsyncMock()
        connector.client.markets = {"BTC/USDT": {}}

        candles = await connector.fetch_candles(
            "BTC/USDT", "1m",
            start=1709337600,  # Seconds
            end=1709337660,
        )

        # Verify start was converted to milliseconds
        connector.client.fetch_ohlcv.assert_called_once()
        call_kwargs = connector.client.fetch_ohlcv.call_args
        assert call_kwargs.kwargs["since"] == 1709337600000  # Milliseconds

    @pytest.mark.asyncio
    async def test_fetch_candles_respects_end_time(self, connector):
        """Test that candles past end time are filtered."""
        connector.client.fetch_ohlcv = AsyncMock(return_value=[
            [1709337600000, 50000.0, 50100.0, 49900.0, 50050.0, 100.0],
            [1709337660000, 50050.0, 50150.0, 49950.0, 50100.0, 150.0],
            [1709337720000, 50100.0, 50200.0, 50000.0, 50150.0, 200.0],
        ])
        connector.client.load_markets = AsyncMock()
        connector.client.markets = {"BTC/USDT": {}}

        candles = await connector.fetch_candles(
            "BTC/USDT", "1m",
            start=1709337600,
            end=1709337660,  # Should stop at second candle
        )

        # Should only return first 2 candles
        assert len(candles) == 2
        assert candles[-1].time == 1709337660


class TestCCXTConnectorTimeframes:
    """Test timeframe handling."""

    def test_get_timeframes_binance(self):
        """Test getting timeframes for Binance."""
        connector = CCXTConnector("binance")
        # Binance client has timeframes defined
        connector.client.timeframes = {
            "1m": "1m", "5m": "5m", "1h": "1h", "1d": "1d"
        }
        timeframes = connector.get_timeframes()
        assert "1m" in timeframes
        assert "1d" in timeframes

    def test_get_timeframes_fallback(self):
        """Test fallback timeframes when exchange doesn't provide them."""
        connector = CCXTConnector("binance")
        connector.client.timeframes = None
        timeframes = connector.get_timeframes()
        # Should return default common timeframes
        assert "1m" in timeframes
        assert "1h" in timeframes


class TestCCXTConnectorStreaming:
    """Test polling-based streaming."""

    @pytest.mark.asyncio
    async def test_subscribe_returns_subscription_id(self):
        """Test that subscribe returns a subscription ID."""
        connector = CCXTConnector("binance")
        connector.client.fetch_ohlcv = AsyncMock(return_value=[
            [1709337600000, 50000.0, 50100.0, 49900.0, 50050.0, 100.0],
        ])
        connector.client.load_markets = AsyncMock()
        connector.client.markets = {"BTC/USDT": {}}

        received = []
        sub_id = await connector.subscribe(
            "BTC/USDT", "1m",
            callback=lambda c: received.append(c),
            poll_interval=0.1,  # Fast polling for test
        )

        assert sub_id.startswith("binance_BTC/USDT_1m_")
        assert sub_id in connector._subscriptions

        # Let it poll once
        await asyncio.sleep(0.15)

        # Unsubscribe
        await connector.unsubscribe(sub_id)
        assert sub_id not in connector._subscriptions

        # Should have received at least one candle
        assert len(received) >= 1

    @pytest.mark.asyncio
    async def test_unsubscribe_nonexistent_logs_warning(self):
        """Test that unsubscribing non-existent ID just logs warning."""
        connector = CCXTConnector("binance")
        # Should not raise, just log warning
        await connector.unsubscribe("nonexistent_sub_id")

    @pytest.mark.asyncio
    async def test_close_stops_all_subscriptions(self):
        """Test that close() stops all active subscriptions."""
        connector = CCXTConnector("binance")
        connector.client.fetch_ohlcv = AsyncMock(return_value=[
            [1709337600000, 50000.0, 50100.0, 49900.0, 50050.0, 100.0],
        ])
        connector.client.load_markets = AsyncMock()
        connector.client.markets = {"BTC/USDT": {}}
        connector.client.close = AsyncMock()

        # Create multiple subscriptions
        await connector.subscribe("BTC/USDT", "1m", lambda c: None, poll_interval=1.0)
        await connector.subscribe("ETH/USDT", "5m", lambda c: None, poll_interval=1.0)

        assert len(connector._subscriptions) == 2

        # Close should clean up all
        await connector.close()

        assert len(connector._subscriptions) == 0
        connector.client.close.assert_called_once()


class TestCreateConnectorFactory:
    """Test the create_connector factory function."""

    def test_create_basic_connector(self):
        """Test creating a basic connector."""
        connector = create_connector("binance")
        assert isinstance(connector, CCXTConnector)
        assert connector.exchange_id == "binance"

    def test_create_authenticated_connector(self):
        """Test creating an authenticated connector."""
        connector = create_connector(
            "kucoin",
            api_key="key",
            api_secret="secret",
            password="passphrase",
        )
        assert connector.is_authenticated
        assert connector.password == "passphrase"


class TestMultipleExchanges:
    """Test that various exchanges work."""

    @pytest.mark.parametrize("exchange_id", [
        "binance",
        "kraken",
        "kucoin",
        "coinbase",
        "bybit",
        "okx",
    ])
    def test_major_exchanges_supported(self, exchange_id):
        """Test that major exchanges can be instantiated."""
        connector = CCXTConnector(exchange_id)
        assert connector.exchange_id == exchange_id