"""
Simple unit tests for Database Analyzer Engine functionality.
"""

import unittest
from unittest.mock import Mock

from a3.engines.database_analyzer import DatabaseAnalyzer
from a3.core.models import DatabaseConnection, DatabaseConnectionError


class TestDatabaseAnalyzerBasic(unittest.TestCase):
    """Basic test cases for DatabaseAnalyzer functionality."""
    
    def test_initialization(self):
        """Test database analyzer initialization."""
        db_analyzer = DatabaseAnalyzer()
        db_analyzer.initialize()
        
        self.assertTrue(db_analyzer._initialized)
        self.assertIsInstance(db_analyzer._connection_pools, dict)
        self.assertIsInstance(db_analyzer._active_connections, dict)
    
    def test_mask_password(self):
        """Test password masking in connection strings."""
        db_analyzer = DatabaseAnalyzer()
        db_analyzer.initialize()
        
        # Test with password
        conn_str_with_pass = "postgresql://user:secret123@localhost:5432/db"
        masked = db_analyzer._mask_password(conn_str_with_pass)
        self.assertNotIn("secret123", masked)
        self.assertIn("***", masked)
        
        # Test without password
        conn_str_no_pass = "postgresql://user@localhost:5432/db"
        masked = db_analyzer._mask_password(conn_str_no_pass)
        self.assertEqual(masked, conn_str_no_pass)
    
    def test_connect_to_database_invalid_scheme(self):
        """Test connection with invalid scheme."""
        db_analyzer = DatabaseAnalyzer()
        db_analyzer.initialize()
        
        invalid_connection = "mysql://user:pass@localhost:3306/db"
        
        with self.assertRaises(DatabaseConnectionError) as context:
            db_analyzer.connect_to_database(invalid_connection)
        
        self.assertIn("Invalid connection string", str(context.exception))
        self.assertIn("postgresql://", str(context.exception))
    
    def test_connect_to_database_missing_database(self):
        """Test connection with missing database name."""
        db_analyzer = DatabaseAnalyzer()
        db_analyzer.initialize()
        
        invalid_connection = "postgresql://user:pass@localhost:5432/"
        
        with self.assertRaises(DatabaseConnectionError) as context:
            db_analyzer.connect_to_database(invalid_connection)
        
        self.assertIn("Database name is required", str(context.exception))
    
    def test_connect_to_database_missing_username(self):
        """Test connection with missing username."""
        db_analyzer = DatabaseAnalyzer()
        db_analyzer.initialize()
        
        invalid_connection = "postgresql://:pass@localhost:5432/db"
        
        with self.assertRaises(DatabaseConnectionError) as context:
            db_analyzer.connect_to_database(invalid_connection)
        
        self.assertIn("Username is required", str(context.exception))
    
    def test_database_connection_validation(self):
        """Test database connection validation."""
        connection = DatabaseConnection(
            connection_string="postgresql://testuser:testpass@localhost:5432/testdb",
            host="localhost",
            port=5432,
            database="testdb",
            username="testuser",
            password="testpass"
        )
        
        # Should not raise exception
        try:
            connection.validate()
        except Exception as e:
            self.fail(f"Valid connection validation failed: {e}")
    
    def test_uninitialized_analyzer_operations(self):
        """Test operations on uninitialized analyzer."""
        # Create uninitialized analyzer
        analyzer = DatabaseAnalyzer()
        
        # Operations should raise RuntimeError
        with self.assertRaises(RuntimeError):
            analyzer.connect_to_database("postgresql://user:pass@localhost:5432/db")


if __name__ == '__main__':
    unittest.main()