"""
Unit tests for OperatorTranslation component.

This module tests OperatorTranslation functionality in isolation, including
logical operator translation, example processing, and integration with BuildModule.
Note: This is currently a TDD test for planned OperatorTranslation extraction.
"""

import unittest
from unittest.mock import Mock

from model_checker.builder.tests.fixtures.test_data import TestExamples, TestTheories, TestConstants
from model_checker.builder.tests.fixtures.mock_objects import MockObjectFactory
from model_checker.builder.tests.fixtures.temp_resources import TempFileCleanup
from model_checker.builder.tests.fixtures.assertions import (
    assert_error_message_contains,
    assert_no_exceptions_during_execution
)

from model_checker.builder.module import BuildModule

# Test the new translation module before it exists (TDD)
try:
    from model_checker.builder.translation import OperatorTranslation
    TRANSLATION_EXISTS = True
except ImportError:
    # Module doesn't exist yet - that's expected in TDD
    OperatorTranslation = None
    TRANSLATION_EXISTS = False


class TestOperatorTranslationCore(unittest.TestCase):
    """Test OperatorTranslation core functionality."""
    
    @unittest.skipIf(not TRANSLATION_EXISTS, "OperatorTranslation not yet implemented")
    def test_operator_translation_initializes_successfully(self):
        """Test OperatorTranslation initializes correctly without parameters."""
        translation = OperatorTranslation()
        
        self.assertIsNotNone(translation,
                           "OperatorTranslation should initialize successfully")
    
    @unittest.skipIf(not TRANSLATION_EXISTS, "OperatorTranslation not yet implemented")
    def test_operator_translation_has_required_interface_methods(self):
        """Test OperatorTranslation has all required interface methods."""
        translation = OperatorTranslation()
        
        required_methods = ['translate', 'translate_example']
        for method_name in required_methods:
            self.assertTrue(hasattr(translation, method_name),
                          f"OperatorTranslation should have {method_name} method")
            self.assertTrue(callable(getattr(translation, method_name)),
                          f"{method_name} should be callable")


class TestOperatorTranslationExecution(unittest.TestCase):
    """Test OperatorTranslation logical operator translation."""
    
    def setUp(self):
        """Set up translation testing environment."""
        self.cleanup = TempFileCleanup()
        self.addCleanup(self.cleanup.__exit__, None, None, None)
        
        # Standard logical operator dictionary
        self.standard_dictionary = {
            "\\wedge": "∧",
            "\\vee": "∨", 
            "\\rightarrow": "→",
            "\\leftrightarrow": "↔",
            "\\neg": "¬"
        }
    
    @unittest.skipIf(not TRANSLATION_EXISTS, "OperatorTranslation not yet implemented")
    def test_operator_translation_translates_basic_operators_correctly(self):
        """Test OperatorTranslation translates basic logical operators correctly."""
        translation = OperatorTranslation()
        
        example_case = [
            ["p \\wedge q", "r \\vee s"],  # premises
            ["p \\rightarrow q"],         # conclusions
            {"N": 2}                     # settings
        ]
        
        result = assert_no_exceptions_during_execution(
            self,
            lambda: translation.translate(example_case, self.standard_dictionary),
            operation_name="Basic operator translation"
        )
        
        # Verify translation results
        self.assertEqual(result[0], ["p ∧ q", "r ∨ s"],
                        "Premises should be translated correctly")
        self.assertEqual(result[1], ["p → q"],
                        "Conclusions should be translated correctly")
        self.assertEqual(result[2], {"N": 2},
                        "Settings should remain unchanged")
    
    @unittest.skipIf(not TRANSLATION_EXISTS, "OperatorTranslation not yet implemented")
    def test_operator_translation_handles_complex_formulas_correctly(self):
        """Test OperatorTranslation handles complex logical formulas correctly."""
        translation = OperatorTranslation()
        
        complex_example = [
            ["(p \\wedge q) \\rightarrow (r \\vee \\neg s)"],
            ["\\neg (p \\leftrightarrow q)"],
            {"N": 3}
        ]
        
        result = translation.translate(complex_example, self.standard_dictionary)
        
        expected_premise = ["(p ∧ q) → (r ∨ ¬ s)"]
        expected_conclusion = ["¬ (p ↔ q)"]
        
        self.assertEqual(result[0], expected_premise,
                        "Complex premise should be translated correctly")
        self.assertEqual(result[1], expected_conclusion,
                        "Complex conclusion should be translated correctly")
    
    @unittest.skipIf(not TRANSLATION_EXISTS, "OperatorTranslation not yet implemented")
    def test_operator_translation_preserves_untranslated_operators(self):
        """Test OperatorTranslation preserves operators not in dictionary."""
        translation = OperatorTranslation()
        
        partial_dictionary = {"\\wedge": "∧"}  # Only translate conjunction
        
        example_case = [
            ["p \\wedge q", "r \\vee s"],
            ["p \\rightarrow q"],
            {"N": 2}
        ]
        
        result = translation.translate(example_case, partial_dictionary)
        
        # Only wedge should be translated
        self.assertEqual(result[0], ["p ∧ q", "r \\vee s"],
                        "Should translate only operators in dictionary")
        self.assertEqual(result[1], ["p \\rightarrow q"],
                        "Should preserve untranslated operators")


class TestOperatorTranslationMultipleTheories(unittest.TestCase):
    """Test OperatorTranslation with multiple semantic theories."""
    
    @unittest.skipIf(not TRANSLATION_EXISTS, "OperatorTranslation not yet implemented")
    def test_operator_translation_handles_multiple_theory_dictionaries(self):
        """Test OperatorTranslation processes multiple theory dictionaries correctly."""
        translation = OperatorTranslation()
        
        example_case = [["p \\wedge q"], ["r"], {"N": 2}]
        
        semantic_theories = {
            "LogosTheory": {
                "dictionary": {"\\wedge": "∧"}
            },
            "CustomTheory": {
                "dictionary": {"\\wedge": "&"}
            },
            "NoDictionaryTheory": {
                # No dictionary key
            }
        }
        
        result = assert_no_exceptions_during_execution(
            self,
            lambda: translation.translate_example(example_case, semantic_theories),
            operation_name="Multiple theory translation"
        )
        
        # Verify result structure
        self.assertIsInstance(result, list,
                            "Result should be a list")
        self.assertEqual(len(result), 3,
                       "Should return results for all three theories")
        
        # Check individual theory results
        theory_results = {item[0]: item for item in result}
        
        # LogosTheory should use ∧
        logos_result = theory_results["LogosTheory"]
        self.assertEqual(logos_result[2][0], ["p ∧ q"],
                        "LogosTheory should use Unicode conjunction")
        
        # CustomTheory should use &
        custom_result = theory_results["CustomTheory"]
        self.assertEqual(custom_result[2][0], ["p & q"],
                        "CustomTheory should use custom operator")
        
        # NoDictionaryTheory should preserve original
        no_dict_result = theory_results["NoDictionaryTheory"]
        self.assertEqual(no_dict_result[2][0], ["p \\wedge q"],
                        "Theory without dictionary should preserve LaTeX")


class TestOperatorTranslationIntegration(unittest.TestCase):
    """Test OperatorTranslation integration with BuildModule."""
    
    def setUp(self):
        """Set up integration testing environment."""
        self.cleanup = TempFileCleanup()
        self.addCleanup(self.cleanup.__exit__, None, None, None)
    
    def test_build_module_integrates_with_translation_after_refactoring(self):
        """Test BuildModule properly integrates with OperatorTranslation after refactoring."""
        # Create mock BuildModule components
        mock_module = Mock()
        mock_flags = Mock()
        
        # Test that BuildModule follows NO BACKWARD COMPATIBILITY principle
        build_module = BuildModule.__new__(BuildModule)
        build_module.module = mock_module
        build_module.module_flags = mock_flags
        
        # After refactoring, translate methods should NOT exist on BuildModule
        self.assertFalse(hasattr(build_module, 'translate'),
                        "BuildModule should not have translate method after refactor")
        self.assertFalse(hasattr(build_module, 'translate_example'),
                        "BuildModule should not have translate_example method after refactor")
        
        # Translation functionality should be handled by OperatorTranslation component
        # (This would be tested after proper BuildModule initialization with translation component)


class TestOperatorTranslationErrorHandling(unittest.TestCase):
    """Test OperatorTranslation error handling scenarios."""
    
    @unittest.skipIf(not TRANSLATION_EXISTS, "OperatorTranslation not yet implemented")
    def test_operator_translation_handles_none_dictionary_gracefully(self):
        """Test OperatorTranslation handles None dictionary parameter gracefully."""
        translation = OperatorTranslation()
        
        example_case = [["p \\wedge q"], ["r"], {"N": 2}]
        
        # Should handle None dictionary without crashing
        result = assert_no_exceptions_during_execution(
            self,
            lambda: translation.translate(example_case, None),
            operation_name="Translation with None dictionary"
        )
        
        # Should preserve original operators
        self.assertEqual(result[0], ["p \\wedge q"],
                        "Should preserve operators when dictionary is None")
    
    @unittest.skipIf(not TRANSLATION_EXISTS, "OperatorTranslation not yet implemented")
    def test_operator_translation_handles_empty_dictionary_gracefully(self):
        """Test OperatorTranslation handles empty dictionary appropriately."""
        translation = OperatorTranslation()
        
        example_case = [["p \\wedge q"], ["r"], {"N": 2}]
        empty_dictionary = {}
        
        result = translation.translate(example_case, empty_dictionary)
        
        # Should preserve original operators
        self.assertEqual(result[0], ["p \\wedge q"],
                        "Should preserve operators when dictionary is empty")
    
    @unittest.skipIf(not TRANSLATION_EXISTS, "OperatorTranslation not yet implemented")
    def test_operator_translation_handles_malformed_example_structure(self):
        """Test OperatorTranslation handles malformed example structures gracefully."""
        translation = OperatorTranslation()
        
        malformed_examples = [
            ["only_premises"],  # Missing conclusions and settings
            [["p"], ["q"]],     # Missing settings dict
            "not_a_list",       # Wrong type entirely
        ]
        
        for malformed_example in malformed_examples:
            with self.subTest(example=malformed_example):
                with self.assertRaises((TypeError, IndexError, AttributeError)):
                    translation.translate(malformed_example, self.standard_dictionary)


class TestOperatorTranslationEdgeCases(unittest.TestCase):
    """Test OperatorTranslation edge cases and boundary conditions."""
    
    def setUp(self):
        """Set up edge case testing environment."""
        self.standard_dictionary = {"\\wedge": "∧", "\\vee": "∨"}
    
    @unittest.skipIf(not TRANSLATION_EXISTS, "OperatorTranslation not yet implemented")
    def test_operator_translation_handles_empty_premises_and_conclusions(self):
        """Test OperatorTranslation handles empty premise and conclusion lists."""
        translation = OperatorTranslation()
        
        empty_example = [[], [], {"N": 2}]
        
        result = translation.translate(empty_example, self.standard_dictionary)
        
        self.assertEqual(result[0], [],
                        "Empty premises should remain empty")
        self.assertEqual(result[1], [],
                        "Empty conclusions should remain empty")
        self.assertEqual(result[2], {"N": 2},
                        "Settings should be preserved")
    
    @unittest.skipIf(not TRANSLATION_EXISTS, "OperatorTranslation not yet implemented")
    def test_operator_translation_handles_unicode_operators_in_input(self):
        """Test OperatorTranslation handles input already containing Unicode operators."""
        translation = OperatorTranslation()
        
        unicode_example = [["p ∧ q"], ["r ∨ s"], {"N": 2}]
        
        result = translation.translate(unicode_example, self.standard_dictionary)
        
        # Should preserve existing Unicode operators
        self.assertEqual(result[0], ["p ∧ q"],
                        "Should preserve existing Unicode operators")
        self.assertEqual(result[1], ["r ∨ s"],
                        "Should preserve existing Unicode operators")


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