import ast
from typing import List, Dict, Any
import black

class TestGenerator:
    def __init__(self):
        self.test_templates = {
            'python': {
                'unit': self._generate_python_unit_test,
                'integration': self._generate_python_integration_test
            }
        }

    def generate_tests(self, code: str, language: str, test_type: str = 'unit') -> str:
        generator = self.test_templates.get(language, {}).get(test_type)
        if not generator:
            raise ValueError(f"Unsupported language or test type: {language}/{test_type}")
        
        test_code = generator(code)
        try:
            return black.format_str(test_code, mode=black.FileMode())
        except:
            return test_code

    def _generate_python_unit_test(self, code: str) -> str:
        tree = ast.parse(code)
        test_cases = []

        for node in ast.walk(tree):
            if isinstance(node, ast.FunctionDef):
                test_cases.append(self._generate_function_test(node))

        return self._format_test_class(test_cases)

    def _generate_function_test(self, func_node: ast.FunctionDef) -> str:
        args = [arg.arg for arg in func_node.args.args]
        test_name = f"test_{func_node.name}"
        
        test_template = f"""
    def {test_name}(self):
        # Arrange
        {''.join(f'{arg} = None  # TODO: Add test value\n        ' for arg in args)}
        
        # Act
        result = {func_node.name}({', '.join(args)})
        
        # Assert
        self.assertIsNotNone(result)  # TODO: Add specific assertions
        """
        return test_template

    def _format_test_class(self, test_cases: List[str]) -> str:
        return f"""import unittest

class TestGeneratedCode(unittest.TestCase):
{''.join(test_cases)}

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

    def _generate_python_integration_test(self, code: str) -> str:
        # Similar to unit test but with more complex scenarios
        return "# TODO: Implement integration tests\n"