"""
FERPA Compliance Security Tests

Tests for Family Educational Rights and Privacy Act compliance,
focusing on student data protection and PII handling.

Test Coverage:
- TC-1.1: PII Anonymization
- TC-1.2: Audit Logging
- TC-1.3: Data Access Controls
- TC-1.4: Data Retention
"""

import pytest
import os
import json
from unittest.mock import Mock, patch, MagicMock
from canvas_mcp.core.anonymization import anonymize_response_data
from canvas_mcp.core.config import Config


class TestPIIAnonymization:
    """Test student PII anonymization functionality."""
    
    def test_student_name_anonymization(self):
        """TC-1.1.1: Verify student names are anonymized when enabled."""
        # Setup
        sample_data = {
            "user": {
                "name": "John Doe",
                "id": 12345,
                "email": "john.doe@example.com"
            }
        }
        
        # Test with anonymization enabled
        with patch.dict(os.environ, {"ENABLE_DATA_ANONYMIZATION": "true"}):
            result = anonymize_response_data(sample_data, "test_endpoint")
            
            # Verify name is anonymized
            assert result["user"]["name"] != "John Doe"
            assert result["user"]["name"].startswith("Student_")
            # Verify ID preserved for functionality
            assert result["user"]["id"] == 12345
    
    def test_student_email_anonymization(self):
        """TC-1.1.2: Verify student emails are anonymized."""
        sample_data = {
            "user": {
                "name": "Jane Smith",
                "id": 54321,  # ID is required for anonymization
                "email": "jane.smith@university.edu"
            }
        }

        with patch.dict(os.environ, {"ENABLE_DATA_ANONYMIZATION": "true"}):
            result = anonymize_response_data(sample_data, "test_endpoint")

            # Verify email is anonymized (format: student_xxxx@example.edu)
            assert result["user"]["email"] != "jane.smith@university.edu"
            assert "@example.edu" in result["user"]["email"]
    
    def test_anonymization_consistency(self):
        """TC-1.1.1: Verify same student gets same anonymous ID across calls."""
        sample_data = {
            "user": {"name": "Test Student", "id": 99999}
        }
        
        with patch.dict(os.environ, {"ENABLE_DATA_ANONYMIZATION": "true"}):
            result1 = anonymize_response_data(sample_data.copy(), "test_endpoint")
            result2 = anonymize_response_data(sample_data.copy(), "test_endpoint")
            
            # Same student should get same anonymous name
            assert result1["user"]["name"] == result2["user"]["name"]
    
    def test_no_pii_in_error_messages(self):
        """TC-1.1.3: Verify PII not leaked in error messages."""
        # This test would verify error handling doesn't expose PII
        # Implementation depends on error handling structure
        pass
    
    @pytest.mark.asyncio
    async def test_no_pii_in_logs(self):
        """TC-1.1.4: Verify PII not logged."""
        # This test would verify logging doesn't contain PII
        # Would require inspecting log output
        pass


class TestAuditLogging:
    """Test audit logging for PII access."""
    
    @pytest.mark.skip(reason="Audit logging not yet implemented")
    def test_pii_access_logged(self):
        """TC-1.2.1: Verify PII access is logged."""
        # Test that accessing student data creates audit log entry
        pass
    
    @pytest.mark.skip(reason="Audit logging not yet implemented")
    def test_audit_log_integrity(self):
        """TC-1.2.2: Verify audit log integrity."""
        # Test that audit logs cannot be tampered with
        pass
    
    @pytest.mark.skip(reason="Audit logging not yet implemented")
    def test_audit_log_retention(self):
        """TC-1.2.3: Verify audit logs are retained per policy."""
        pass


class TestDataAccessControls:
    """Test data access control mechanisms."""
    
    def test_student_tools_self_endpoints_only(self):
        """TC-2.2.1: Verify student tools only access own data."""
        # Test that student-specific tools use Canvas "self" endpoints
        # Would require analyzing tool implementations
        pass
    
    def test_educator_permission_required(self):
        """TC-2.2.2: Verify educator tools require proper permissions."""
        # Test that educator tools check for instructor/TA role
        pass


class TestDataRetention:
    """Test data retention and cleanup."""
    
    def test_temporary_files_cleanup(self):
        """TC-1.3.1: Verify temporary files containing PII are cleaned up."""
        # Test that temporary files are deleted after use
        pass
    
    @pytest.mark.skip(reason="Data retention policy not yet implemented")
    def test_data_retention_policy(self):
        """TC-1.3.2: Verify data retention policy is enforced."""
        pass


class TestComplianceFeatures:
    """Test FERPA compliance features."""
    
    def test_anonymization_config_option(self):
        """Verify anonymization can be enabled via configuration."""
        with patch.dict(os.environ, {"ENABLE_DATA_ANONYMIZATION": "true"}):
            config = Config()
            # Verify config reflects anonymization setting
            # Implementation depends on Config structure
    
    def test_anonymization_disabled_by_default_for_students(self):
        """Verify students don't need anonymization (self-endpoints)."""
        # Students access only their own data, no anonymization needed
        pass


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