"""Tests for VolatilityRegimeDetector."""

import pytest
import numpy as np
from unittest.mock import Mock
from nautilus_dolphin.nautilus.volatility_detector import VolatilityRegimeDetector


class TestVolatilityRegimeDetector:
    
    def test_insufficient_data_returns_true(self):
        """Permissive default when insufficient data."""
        detector = VolatilityRegimeDetector(min_history=100)
        assert detector.is_high_regime() == True
        
    def test_update_calculates_volatility(self):
        """Test volatility calculation from bars."""
        detector = VolatilityRegimeDetector(lookback_bars=50, min_history=10)
        
        # Generate synthetic bars with increasing volatility
        for i in range(60):
            bar = Mock()
            bar.close = 100 + np.random.randn() * (1 + i * 0.1)
            detector.update(bar)
            
        assert detector._current_vol is not None
        assert len(detector._volatility_history) > 0
        
    def test_high_regime_detection(self):
        """Test dual-threshold regime detection."""
        detector = VolatilityRegimeDetector(lookback_bars=50, min_history=10)
        
        # Low volatility period
        for i in range(30):
            bar = Mock()
            bar.close = 100 + np.random.randn() * 0.1
            detector.update(bar)
            
        # High volatility period
        for i in range(30):
            bar = Mock()
            bar.close = 100 + np.random.randn() * 5.0
            detector.update(bar)
            
        # Should detect high regime
        assert detector.is_high_regime() == True
        
    def test_regime_info(self):
        """Test regime info dict."""
        detector = VolatilityRegimeDetector(lookback_bars=50, min_history=10)
        
        for i in range(60):
            bar = Mock()
            bar.close = 100 + np.random.randn()
            detector.update(bar)
            
        info = detector.get_regime_info()
        assert 'status' in info
        assert 'current_vol' in info
        assert 'p50' in info
        assert 'p75' in info