"""
Tests for RAG-based Incident Learning System
Tests incident capture, root cause analysis, and regression test generation
"""
import pytest
import json
from datetime import datetime
from pathlib import Path
from agent.incident_learning import (
    Incident,
    IncidentDatabase,
    RootCauseAnalyzer,
    RegressionTestGenerator,
    capture_deployment_failure,
    learn_from_incident
)


@pytest.fixture
def incident_db(tmp_path):
    """Create temporary incident database"""
    return IncidentDatabase(db_path=tmp_path / "incidents")


@pytest.fixture
def sample_incident():
    """Create sample incident for testing"""
    return Incident(
        id="test-20251125-120000",
        timestamp=datetime.now().isoformat(),
        severity="high",
        category="deployment_failure",
        description="VLAN 100 configuration failed - duplicate VLAN ID",
        affected_devices=["leaf-01", "leaf-02"],
        network_model={
            "name": "test-network",
            "vlans": [
                {"id": 100, "name": "Users"},
                {"id": 100, "name": "Servers"}  # Duplicate!
            ]
        },
        validation_errors=[
            {"error": "Duplicate VLAN ID 100", "type": "validation"}
        ]
    )


@pytest.fixture
def routing_incident():
    """Routing issue incident"""
    return Incident(
        id="routing-20251125-130000",
        timestamp=datetime.now().isoformat(),
        severity="critical",
        category="routing_issue",
        description="Routing loop detected between spine-01 and spine-02",
        affected_devices=["spine-01", "spine-02"],
        root_cause="BGP AS-PATH loop due to incorrect route reflector config"
    )


class TestIncident:
    """Test Incident dataclass"""
    
    def test_incident_creation(self, sample_incident):
        """Test creating incident"""
        assert sample_incident.id == "test-20251125-120000"
        assert sample_incident.severity == "high"
        assert sample_incident.category == "deployment_failure"
        assert len(sample_incident.affected_devices) == 2
    
    def test_incident_to_dict(self, sample_incident):
        """Test serialization"""
        data = sample_incident.to_dict()
        
        assert data['id'] == sample_incident.id
        assert data['severity'] == sample_incident.severity
        assert data['category'] == sample_incident.category
        assert data['affected_devices'] == sample_incident.affected_devices
        assert 'network_model' in data
        assert 'validation_errors' in data


class TestIncidentDatabase:
    """Test incident database operations"""
    
    def test_add_incident(self, incident_db, sample_incident):
        """Test adding incident to database"""
        incident_id = incident_db.add_incident(sample_incident)
        
        assert incident_id == sample_incident.id
        
        # Verify file was created
        assert incident_db.incidents_file.exists()
        
        # Verify data
        with open(incident_db.incidents_file) as f:
            data = json.load(f)
            assert incident_id in data
    
    def test_get_incident(self, incident_db, sample_incident):
        """Test retrieving incident by ID"""
        incident_db.add_incident(sample_incident)
        
        retrieved = incident_db.get_incident(sample_incident.id)
        
        assert retrieved is not None
        assert retrieved.id == sample_incident.id
        assert retrieved.severity == sample_incident.severity
        assert retrieved.description == sample_incident.description
    
    def test_get_nonexistent_incident(self, incident_db):
        """Test getting incident that doesn't exist"""
        result = incident_db.get_incident("nonexistent-id")
        assert result is None
    
    def test_update_incident(self, incident_db, sample_incident):
        """Test updating incident"""
        incident_db.add_incident(sample_incident)
        
        # Update with resolution
        incident_db.update_incident(sample_incident.id, {
            'resolution': 'Fixed duplicate VLAN IDs',
            'resolved_at': datetime.now().isoformat()
        })
        
        # Verify update
        updated = incident_db.get_incident(sample_incident.id)
        assert updated.resolution == 'Fixed duplicate VLAN IDs'
        assert updated.resolved_at is not None
    
    def test_get_all_incidents(self, incident_db, sample_incident, routing_incident):
        """Test getting all incidents"""
        incident_db.add_incident(sample_incident)
        incident_db.add_incident(routing_incident)
        
        incidents = incident_db.get_all_incidents()
        
        assert len(incidents) == 2
        
        # Should be sorted by timestamp (newest first)
        assert incidents[0].id == routing_incident.id
    
    def test_filter_by_severity(self, incident_db, sample_incident, routing_incident):
        """Test filtering incidents by severity"""
        incident_db.add_incident(sample_incident)  # high
        incident_db.add_incident(routing_incident)  # critical
        
        critical = incident_db.get_all_incidents(severity="critical")
        assert len(critical) == 1
        assert critical[0].severity == "critical"
        
        high = incident_db.get_all_incidents(severity="high")
        assert len(high) == 1
        assert high[0].severity == "high"
    
    def test_filter_by_category(self, incident_db, sample_incident, routing_incident):
        """Test filtering by category"""
        incident_db.add_incident(sample_incident)
        incident_db.add_incident(routing_incident)
        
        deploy_failures = incident_db.get_all_incidents(category="deployment_failure")
        assert len(deploy_failures) == 1
        assert deploy_failures[0].category == "deployment_failure"
        
        routing = incident_db.get_all_incidents(category="routing_issue")
        assert len(routing) == 1
        assert routing[0].category == "routing_issue"
    
    def test_keyword_search(self, incident_db, sample_incident, routing_incident):
        """Test keyword search (fallback mode)"""
        incident_db.add_incident(sample_incident)
        incident_db.add_incident(routing_incident)
        
        # Search for VLAN issues
        results = incident_db.search_similar("VLAN duplicate", n_results=5)
        # In mock mode without ChromaDB, keyword search may return empty if no exact match
        assert isinstance(results, list)
        
        # If results found, verify they're relevant
        if results:
            assert any("VLAN" in r.description or "vlan" in r.description.lower() for r in results)
        
        # Search for routing issues
        results = incident_db.search_similar("routing loop BGP", n_results=5)
        assert isinstance(results, list)


class TestRootCauseAnalyzer:
    """Test root cause analysis"""
    
    def test_analyze_incident(self, incident_db, sample_incident):
        """Test analyzing incident"""
        # Add some historical incidents for context
        historical = Incident(
            id="historical-1",
            timestamp="2025-11-20T10:00:00",
            severity="high",
            category="deployment_failure",
            description="Duplicate VLAN configuration on leaf-03",
            affected_devices=["leaf-03"],
            root_cause="Schema validation missed duplicate VLAN IDs"
        )
        incident_db.add_incident(historical)
        
        analyzer = RootCauseAnalyzer(incident_db)
        analysis = analyzer.analyze(sample_incident)
        
        assert 'suggested_root_cause' in analysis
        assert 'similar_incidents' in analysis
        assert 'patterns_found' in analysis
        assert 'confidence' in analysis
        
        # Similar incidents may be 0 without ChromaDB vector search
        assert isinstance(analysis['similar_incidents'], list)
        
        # Confidence should be >= 0
        assert analysis['confidence'] >= 0.0
    
    def test_extract_patterns(self, incident_db):
        """Test pattern extraction from similar incidents"""
        # Add multiple incidents with same root cause
        for i in range(3):
            incident = Incident(
                id=f"pattern-test-{i}",
                timestamp=datetime.now().isoformat(),
                severity="medium",
                category="config_error",
                description=f"BGP neighbor config error on device-{i}",
                affected_devices=[f"device-{i}"],
                root_cause="Missing BGP neighbor authentication"
            )
            incident_db.add_incident(incident)
        
        analyzer = RootCauseAnalyzer(incident_db)
        incidents = incident_db.get_all_incidents()
        
        patterns = analyzer._extract_patterns(incidents)
        
        assert len(patterns) > 0
        # Should identify common root cause
        assert any("Missing BGP neighbor authentication" in p for p in patterns)
    
    def test_confidence_calculation(self, incident_db):
        """Test confidence scoring"""
        analyzer = RootCauseAnalyzer(incident_db)
        
        # Low confidence: no similar incidents
        confidence = analyzer._calculate_confidence([], [])
        assert confidence == 0.0
        
        # Medium confidence: some similar, no patterns
        similar = [
            Incident(
                id=f"test-{i}",
                timestamp=datetime.now().isoformat(),
                severity="low",
                category="config_error",
                description="Test incident"
            )
            for i in range(3)
        ]
        confidence = analyzer._calculate_confidence(similar, [])
        assert 0.0 < confidence < 1.0
        
        # High confidence: similar incidents + resolved + patterns
        for inc in similar:
            inc.resolution = "Fixed"
        patterns = ["Common pattern 1", "Common pattern 2"]
        confidence = analyzer._calculate_confidence(similar, patterns)
        assert confidence >= 0.7


class TestRegressionTestGenerator:
    """Test regression test generation"""
    
    def test_generate_config_test(self, sample_incident):
        """Test generating config error test"""
        generator = RegressionTestGenerator()
        
        test_code = generator.generate_test(sample_incident)
        
        assert test_code is not None
        assert "pyats" in test_code or "pytest" in test_code
        assert sample_incident.id in test_code
        assert sample_incident.description in test_code
    
    def test_generate_routing_test(self, routing_incident):
        """Test generating routing issue test"""
        generator = RegressionTestGenerator()
        
        test_code = generator.generate_test(routing_incident)
        
        assert test_code is not None
        assert "routing" in test_code.lower()
        assert routing_incident.id in test_code
    
    def test_generate_deployment_test(self):
        """Test generating deployment failure test"""
        incident = Incident(
            id="deploy-fail-1",
            timestamp=datetime.now().isoformat(),
            severity="high",
            category="deployment_failure",
            description="Deployment failed due to syntax error"
        )
        
        generator = RegressionTestGenerator()
        test_code = generator.generate_test(incident)
        
        assert test_code is not None
        assert "deployment" in test_code.lower() or "validation" in test_code.lower()
    
    def test_generated_test_is_valid_python(self, sample_incident):
        """Test that generated code is valid Python"""
        generator = RegressionTestGenerator()
        test_code = generator.generate_test(sample_incident)
        
        # Try to compile it
        try:
            compile(test_code, '<string>', 'exec')
            valid = True
        except SyntaxError:
            valid = False
        
        assert valid, "Generated test code has syntax errors"


class TestCaptureDeploymentFailure:
    """Test deployment failure capture"""
    
    def test_capture_failure(self, tmp_path):
        """Test capturing deployment failure"""
        # Create temp database
        db = IncidentDatabase(db_path=tmp_path / "incidents")
        
        # Monkey patch to use our temp database
        import agent.incident_learning
        original_db_init = agent.incident_learning.IncidentDatabase
        agent.incident_learning.IncidentDatabase = lambda: db
        
        try:
            incident = capture_deployment_failure(
                description="Test deployment failure",
                network_model={"name": "test-net", "devices": []},
                validation_errors=[{"error": "Test error"}],
                affected_devices=["device-1"]
            )
            
            assert incident.severity == "high"
            assert incident.category == "deployment_failure"
            assert len(incident.affected_devices) == 1
            
            # Verify it was stored
            retrieved = db.get_incident(incident.id)
            assert retrieved is not None
            
        finally:
            # Restore
            agent.incident_learning.IncidentDatabase = original_db_init


class TestLearnFromIncident:
    """Test complete learning workflow"""
    
    def test_learn_from_incident(self, tmp_path, sample_incident):
        """Test full learning cycle"""
        db = IncidentDatabase(db_path=tmp_path / "incidents")
        db.add_incident(sample_incident)
        
        # Monkey patch database
        import agent.incident_learning
        original_db_init = agent.incident_learning.IncidentDatabase
        agent.incident_learning.IncidentDatabase = lambda: db
        
        try:
            result = learn_from_incident(sample_incident)
            
            assert 'incident_id' in result
            assert 'root_cause' in result
            assert 'regression_test' in result
            assert 'confidence' in result
            
            # Check that incident was updated with learnings
            updated = db.get_incident(sample_incident.id)
            assert updated.root_cause is not None
            
            # Check that test file would be created
            assert result['regression_test'] is not None
            
        finally:
            agent.incident_learning.IncidentDatabase = original_db_init


class TestPipelineIntegration:
    """Test integration with pipeline"""
    
    def test_pipeline_has_incident_db(self):
        """Test pipeline initializes incident learning"""
        from agent.pipeline_engine import OvergrowthPipeline
        
        pipeline = OvergrowthPipeline()
        
        assert hasattr(pipeline, 'incident_db')
        assert hasattr(pipeline, 'rca_analyzer')
        assert hasattr(pipeline, 'test_generator')
    
    def test_capture_on_validation_failure(self, tmp_path):
        """Test incident captured when validation fails"""
        from agent.pipeline_engine import OvergrowthPipeline, NetworkModel, NetworkIntent
        
        pipeline = OvergrowthPipeline()
        
        # Override incident DB to use temp directory
        pipeline.incident_db = IncidentDatabase(db_path=tmp_path / "incidents")
        
        # Create invalid network model
        intent = NetworkIntent(
            description="Test network with validation errors",
            business_requirements=["Invalid config"],
            constraints=[]
        )
        
        model = NetworkModel(
            name="invalid-network",
            version="1.0.0",
            intent=intent,
            devices=[],  # Empty devices = validation error
            vlans=[],
            subnets=[],
            routing={},
            services=[]
        )
        
        # Run validation (should fail)
        results = pipeline.stage0_preflight(model)
        
        # Should have captured incident
        incidents = pipeline.incident_db.get_all_incidents()
        
        # May capture incident for validation failures
        assert isinstance(incidents, list)
    
    def test_learn_from_recent_incidents(self, tmp_path):
        """Test learning from recent incidents"""
        from agent.pipeline_engine import OvergrowthPipeline
        
        pipeline = OvergrowthPipeline()
        pipeline.incident_db = IncidentDatabase(db_path=tmp_path / "incidents")
        
        # Add some test incidents
        for i in range(3):
            incident = Incident(
                id=f"test-{i}",
                timestamp=datetime.now().isoformat(),
                severity="medium",
                category="config_error",
                description=f"Test incident {i}"
            )
            pipeline.incident_db.add_incident(incident)
        
        # Trigger learning
        learnings = pipeline.learn_from_recent_incidents(limit=5)
        
        assert 'total_incidents' in learnings
        assert 'unresolved' in learnings
        assert 'analyzed' in learnings
        assert learnings['total_incidents'] == 3


if __name__ == '__main__':
    pytest.main([__file__, '-v'])