import pytest
import pandas as pd
from datetime import datetime
from unittest.mock import MagicMock

from strategies.factory import StrategyFactory
from strategies.base import BaseStrategy
from strategies.data_types import StrategyResult, StrategySignal, SignalType
from data.common.data_types import OHLCVCandle
from data.common.indicators import TechnicalIndicators # For mocking purposes

# Mock logger for testing
class MockLogger:
    def __init__(self):
        self.info_calls = []
        self.warning_calls = []
        self.error_calls = []

    def info(self, message):
        self.info_calls.append(message)

    def warning(self, message):
        self.warning_calls.append(message)

    def error(self, message):
        self.error_calls.append(message)

# Mock Concrete Strategy for testing StrategyFactory
class MockEMAStrategy(BaseStrategy):
    def __init__(self, logger=None):
        super().__init__("ema_crossover", logger)
        self.calculate_calls = []

    def get_required_indicators(self) -> list[dict]:
        return [{'type': 'ema', 'period': 12}, {'type': 'ema', 'period': 26}]

    def calculate(self, data: pd.DataFrame, **kwargs) -> list[StrategyResult]:
        self.calculate_calls.append((data, kwargs))
        # Simulate a signal for testing
        if not data.empty:
            first_row = data.iloc[0]
            return [StrategyResult(
                timestamp=first_row.name,
                symbol=first_row['symbol'],
                timeframe=first_row['timeframe'],
                strategy_name=self.strategy_name,
                signals=[StrategySignal(
                    timestamp=first_row.name,
                    symbol=first_row['symbol'],
                    timeframe=first_row['timeframe'],
                    signal_type=SignalType.BUY,
                    price=float(first_row['close']),
                    confidence=1.0
                )],
                indicators_used={}
            )]
        return []

class MockRSIStrategy(BaseStrategy):
    def __init__(self, logger=None):
        super().__init__("rsi", logger)
        self.calculate_calls = []

    def get_required_indicators(self) -> list[dict]:
        return [{'type': 'rsi', 'period': 14}]

    def calculate(self, data: pd.DataFrame, **kwargs) -> list[StrategyResult]:
        self.calculate_calls.append((data, kwargs))
        # Simulate a signal for testing
        if not data.empty:
            first_row = data.iloc[0]
            return [StrategyResult(
                timestamp=first_row.name,
                symbol=first_row['symbol'],
                timeframe=first_row['timeframe'],
                strategy_name=self.strategy_name,
                signals=[StrategySignal(
                    timestamp=first_row.name,
                    symbol=first_row['symbol'],
                    timeframe=first_row['timeframe'],
                    signal_type=SignalType.SELL,
                    price=float(first_row['close']),
                    confidence=0.9
                )],
                indicators_used={}
            )]
        return []

@pytest.fixture
def mock_logger():
    return MockLogger()

@pytest.fixture
def mock_technical_indicators():
    mock_ti = MagicMock(spec=TechnicalIndicators)
    # Configure the mock to return dummy data for indicators
    def mock_calculate(indicator_type, df, **kwargs):
        if indicator_type == 'ema':
            # Simulate EMA data
            return pd.DataFrame({
                'ema_fast': df['close'] * 1.02,
                'ema_slow': df['close'] * 0.98
            }, index=df.index)
        elif indicator_type == 'rsi':
            # Simulate RSI data
            return pd.DataFrame({
                'rsi': pd.Series([60, 65, 72, 28, 35], index=df.index)
            }, index=df.index)
        return pd.DataFrame(index=df.index)

    mock_ti.calculate.side_effect = mock_calculate
    return mock_ti

@pytest.fixture
def strategy_factory(mock_technical_indicators, mock_logger, monkeypatch):
    # Patch the strategy factory to use our mock strategies
    monkeypatch.setattr(
        "strategies.factory.StrategyFactory._STRATEGIES",
        {
            "ema_crossover": MockEMAStrategy,
            "rsi": MockRSIStrategy,
        }
    )
    return StrategyFactory(mock_technical_indicators, mock_logger)

@pytest.fixture
def sample_ohlcv_data():
    return pd.DataFrame({
        'open': [100, 101, 102, 103, 104],
        'high': [105, 106, 107, 108, 109],
        'low': [99, 100, 101, 102, 103],
        'close': [102, 103, 104, 105, 106],
        'volume': [1000, 1100, 1200, 1300, 1400],
        'symbol': ['BTC/USDT'] * 5,
        'timeframe': ['1h'] * 5
    }, index=pd.to_datetime(['2023-01-01 00:00:00', '2023-01-01 01:00:00', '2023-01-01 02:00:00', 
                             '2023-01-01 03:00:00', '2023-01-01 04:00:00']))

def test_get_available_strategies(strategy_factory):
    available_strategies = strategy_factory.get_available_strategies()
    assert "ema_crossover" in available_strategies
    assert "rsi" in available_strategies
    assert "macd" not in available_strategies # Should not be present if not mocked

def test_create_strategy_success(strategy_factory):
    ema_strategy = strategy_factory.create_strategy("ema_crossover")
    assert isinstance(ema_strategy, MockEMAStrategy)
    assert ema_strategy.strategy_name == "ema_crossover"

def test_create_strategy_unknown(strategy_factory):
    with pytest.raises(ValueError, match="Unknown strategy type: unknown_strategy"):
        strategy_factory.create_strategy("unknown_strategy")

def test_calculate_multiple_strategies_success(strategy_factory, sample_ohlcv_data, mock_technical_indicators):
    strategy_configs = [
        {"strategy": "ema_crossover", "fast_period": 12, "slow_period": 26},
        {"strategy": "rsi", "period": 14, "overbought": 70, "oversold": 30}
    ]
    
    all_strategy_results = strategy_factory.calculate_multiple_strategies(
        strategy_configs, sample_ohlcv_data
    )

    assert len(all_strategy_results) == 2 # Expect results for both strategies
    assert "ema_crossover" in all_strategy_results
    assert "rsi" in all_strategy_results

    ema_results = all_strategy_results["ema_crossover"]
    rsi_results = all_strategy_results["rsi"]

    assert len(ema_results) > 0
    assert ema_results[0].strategy_name == "ema_crossover"
    assert len(rsi_results) > 0
    assert rsi_results[0].strategy_name == "rsi"

    # Verify that TechnicalIndicators.calculate was called with correct arguments
    # EMA calls
    ema_calls = [call for call in mock_technical_indicators.calculate.call_args_list if call.args[0] == 'ema']
    assert len(ema_calls) == 2 # Two EMA indicators for ema_crossover strategy
    assert ema_calls[0].kwargs['period'] == 12 or ema_calls[0].kwargs['period'] == 26
    assert ema_calls[1].kwargs['period'] == 12 or ema_calls[1].kwargs['period'] == 26

    # RSI calls
    rsi_calls = [call for call in mock_technical_indicators.calculate.call_args_list if call.args[0] == 'rsi']
    assert len(rsi_calls) == 1 # One RSI indicator for rsi strategy
    assert rsi_calls[0].kwargs['period'] == 14

def test_calculate_multiple_strategies_no_configs(strategy_factory, sample_ohlcv_data):
    results = strategy_factory.calculate_multiple_strategies([], sample_ohlcv_data)
    assert not results

def test_calculate_multiple_strategies_empty_data(strategy_factory, mock_technical_indicators):
    strategy_configs = [
        {"strategy": "ema_crossover", "fast_period": 12, "slow_period": 26}
    ]
    empty_df = pd.DataFrame(columns=['open', 'high', 'low', 'close', 'volume', 'symbol', 'timeframe'])
    results = strategy_factory.calculate_multiple_strategies(strategy_configs, empty_df)
    assert not results

def test_calculate_multiple_strategies_missing_indicator_data(strategy_factory, sample_ohlcv_data, mock_logger, mock_technical_indicators):
    # Simulate a scenario where an indicator is requested but not returned by TechnicalIndicators
    def mock_calculate_no_ema(indicator_type, df, **kwargs):
        if indicator_type == 'ema':
            return pd.DataFrame(index=df.index) # Simulate no EMA data returned
        elif indicator_type == 'rsi':
            return pd.DataFrame({'rsi': df['close']}, index=df.index)
        return pd.DataFrame(index=df.index)
    
    mock_technical_indicators.calculate.side_effect = mock_calculate_no_ema

    strategy_configs = [
        {"strategy": "ema_crossover", "fast_period": 12, "slow_period": 26}
    ]
    
    results = strategy_factory.calculate_multiple_strategies(
        strategy_configs, sample_ohlcv_data
    )
    assert not results # Expect no results if indicators are missing
    assert "Missing required indicator data for key: ema_period_12" in mock_logger.error_calls or \
           "Missing required indicator data for key: ema_period_26" in mock_logger.error_calls