# Tests for intent classifier
import pytest
from unittest.mock import Mock, patch, MagicMock

from src.agent.intent_classifier import (
    IntentClassifier,
    IntentType,
    ClassificationResult,
    get_intent_classifier,
    reset_intent_classifier,
)


class TestIntentType:
    # Tests for IntentType enum
    
    def test_intent_types_exist(self):
        assert IntentType.DOCUMENT_QUERY is not None
        assert IntentType.DATABASE_QUERY is not None
        assert IntentType.HYBRID_QUERY is not None
        assert IntentType.CONVERSATIONAL is not None
        assert IntentType.AMBIGUOUS is not None
    
    def test_intent_type_values(self):
        assert IntentType.DOCUMENT_QUERY.value == "document_query"
        assert IntentType.DATABASE_QUERY.value == "database_query"
        assert IntentType.HYBRID_QUERY.value == "hybrid_query"
        assert IntentType.CONVERSATIONAL.value == "conversational"
        assert IntentType.AMBIGUOUS.value == "ambiguous"


class TestClassificationResult:
    # Tests for ClassificationResult dataclass
    
    def test_classification_result_creation(self):
        result = ClassificationResult(
            intent=IntentType.DATABASE_QUERY,
            confidence=0.95,
            reasoning="Test reasoning",
            suggested_tables=["users", "orders"],
        )
        
        assert result.intent == IntentType.DATABASE_QUERY
        assert result.confidence == 0.95
        assert result.reasoning == "Test reasoning"
        assert result.suggested_tables == ["users", "orders"]
    
    def test_classification_result_default_values(self):
        result = ClassificationResult(
            intent=IntentType.DOCUMENT_QUERY,
            confidence=0.8,
            reasoning="Default test",
        )
        
        assert result.suggested_tables == []
        assert result.requires_clarification is False
    
    def test_classification_result_to_dict(self):
        result = ClassificationResult(
            intent=IntentType.HYBRID_QUERY,
            confidence=0.85,
            reasoning="Both sources needed",
            suggested_tables=["products"],
        )
        
        data = result.to_dict()
        
        assert data["intent"] == "hybrid_query"
        assert data["confidence"] == 0.85
        assert data["reasoning"] == "Both sources needed"
        assert data["suggested_tables"] == ["products"]
    
    def test_is_database_related(self):
        db_result = ClassificationResult(IntentType.DATABASE_QUERY, 0.9, "test")
        hybrid_result = ClassificationResult(IntentType.HYBRID_QUERY, 0.8, "test")
        doc_result = ClassificationResult(IntentType.DOCUMENT_QUERY, 0.9, "test")
        
        assert db_result.is_database_related() is True
        assert hybrid_result.is_database_related() is True
        assert doc_result.is_database_related() is False
    
    def test_is_document_related(self):
        doc_result = ClassificationResult(IntentType.DOCUMENT_QUERY, 0.9, "test")
        hybrid_result = ClassificationResult(IntentType.HYBRID_QUERY, 0.8, "test")
        db_result = ClassificationResult(IntentType.DATABASE_QUERY, 0.9, "test")
        
        assert doc_result.is_document_related() is True
        assert hybrid_result.is_document_related() is True
        assert db_result.is_document_related() is False


class TestIntentClassifier:
    # Tests for IntentClassifier class
    
    @pytest.fixture
    def classifier(self):
        with patch("src.agent.intent_classifier.Groq") as mock_groq_class:
            mock_client = Mock()
            mock_groq_class.return_value = mock_client
            classifier = IntentClassifier(api_key="test_key")
            classifier._client = mock_client
            return classifier
    
    def test_classifier_initialization(self):
        classifier = IntentClassifier(api_key="test", confidence_threshold=0.8)
        assert classifier._confidence_threshold == 0.8
    
    def test_classifier_with_custom_threshold(self):
        classifier = IntentClassifier(
            api_key="test",
            confidence_threshold=0.5,
        )
        assert classifier._confidence_threshold == 0.5
    
    def test_classify_database_query(self, classifier):
        mock_response = Mock()
        mock_response.choices = [
            Mock(message=Mock(content='{"intent": "DATABASE_QUERY", "confidence": 0.9, "reasoning": "SQL needed", "suggested_tables": ["musteriler"]}'))
        ]
        classifier._client.chat.completions.create.return_value = mock_response
        
        result = classifier.classify("Kac tane musterimiz var?")
        
        assert result.intent == IntentType.DATABASE_QUERY
        assert result.confidence == 0.9
        assert "musteriler" in result.suggested_tables
    
    def test_classify_document_query(self, classifier):
        mock_response = Mock()
        mock_response.choices = [
            Mock(message=Mock(content='{"intent": "DOCUMENT_QUERY", "confidence": 0.85, "reasoning": "Document search", "suggested_tables": []}'))
        ]
        classifier._client.chat.completions.create.return_value = mock_response
        
        result = classifier.classify("Sirketi kim kurdu?")
        
        assert result.intent == IntentType.DOCUMENT_QUERY
    
    def test_classify_hybrid_query(self, classifier):
        mock_response = Mock()
        mock_response.choices = [
            Mock(message=Mock(content='{"intent": "HYBRID_QUERY", "confidence": 0.75, "reasoning": "Both needed", "suggested_tables": ["urunler"]}'))
        ]
        classifier._client.chat.completions.create.return_value = mock_response
        
        result = classifier.classify("Urun politikamiz nedir ve kac urunumuz var?")
        
        assert result.intent == IntentType.HYBRID_QUERY
    
    def test_classify_conversational(self, classifier):
        mock_response = Mock()
        mock_response.choices = [
            Mock(message=Mock(content='{"intent": "CONVERSATIONAL", "confidence": 0.95, "reasoning": "Greeting", "suggested_tables": []}'))
        ]
        classifier._client.chat.completions.create.return_value = mock_response
        
        result = classifier.classify("Merhaba!")
        
        assert result.intent == IntentType.CONVERSATIONAL
    
    def test_classify_with_context(self, classifier):
        mock_response = Mock()
        mock_response.choices = [
            Mock(message=Mock(content='{"intent": "DATABASE_QUERY", "confidence": 0.88, "reasoning": "With context", "suggested_tables": []}'))
        ]
        classifier._client.chat.completions.create.return_value = mock_response
        
        chat_history = [{"role": "user", "content": "previous query"}]
        result = classifier.classify("Devam et", chat_history)
        
        assert result is not None
        classifier._client.chat.completions.create.assert_called_once()
    
    def test_classify_invalid_json_response(self, classifier):
        mock_response = Mock()
        mock_response.choices = [Mock(message=Mock(content="Invalid JSON"))]
        classifier._client.chat.completions.create.return_value = mock_response
        
        result = classifier.classify("Test query")
        
        # Implementation defaults to DOCUMENT_QUERY on parse failure
        assert result.intent == IntentType.DOCUMENT_QUERY
        assert result.confidence == 0.5
    
    def test_classify_api_error(self, classifier):
        classifier._client.chat.completions.create.side_effect = Exception("API Error")
        
        result = classifier.classify("Test query")
        
        # Implementation defaults to DOCUMENT_QUERY on API error
        assert result.intent == IntentType.DOCUMENT_QUERY
        assert result.confidence == 0.5


class TestIntentClassifierSingleton:
    # Tests for singleton pattern
    
    def setup_method(self):
        reset_intent_classifier()
    
    def teardown_method(self):
        reset_intent_classifier()
    
    @patch("src.agent.intent_classifier.Groq")
    def test_get_intent_classifier_creates_instance(self, mock_groq):
        classifier = get_intent_classifier()
        assert classifier is not None
        assert isinstance(classifier, IntentClassifier)
    
    @patch("src.agent.intent_classifier.Groq")
    def test_get_intent_classifier_returns_same_instance(self, mock_groq):
        classifier1 = get_intent_classifier()
        classifier2 = get_intent_classifier()
        assert classifier1 is classifier2
    
    @patch("src.agent.intent_classifier.Groq")
    def test_reset_intent_classifier(self, mock_groq):
        classifier1 = get_intent_classifier()
        reset_intent_classifier()
        classifier2 = get_intent_classifier()
        assert classifier1 is not classifier2


class TestIntentClassifierEdgeCases:
    # Tests for edge cases and confidence thresholds

    @pytest.fixture
    def classifier(self):
        with patch("src.agent.intent_classifier.Groq") as mock_groq_class:
            mock_client = Mock()
            mock_groq_class.return_value = mock_client
            classifier = IntentClassifier(api_key="test_key", confidence_threshold=0.7)
            classifier._client = mock_client
            return classifier

    def test_classify_empty_query(self, classifier):
        # Empty query should return AMBIGUOUS with requires_clarification
        result = classifier.classify("")
        assert result.intent == IntentType.AMBIGUOUS
        assert result.requires_clarification is True
        assert result.confidence == 1.0

    def test_classify_whitespace_only_query(self, classifier):
        result = classifier.classify("   ")
        assert result.intent == IntentType.AMBIGUOUS
        assert result.requires_clarification is True

    def test_classify_with_available_tables(self, classifier):
        # Verify available_tables is included in prompt
        mock_response = Mock()
        mock_response.choices = [
            Mock(message=Mock(content='{"intent": "DATABASE_QUERY", "confidence": 0.9, "reasoning": "Tables hint", "suggested_tables": ["CreditFileVersion"]}'))
        ]
        classifier._client.chat.completions.create.return_value = mock_response

        result = classifier.classify(
            "Kac kredi dosyasi var?",
            available_tables=["CreditFileVersion", "CreditFileElement", "Contract"],
        )
        assert result.intent == IntentType.DATABASE_QUERY
        # Verify the LLM was called with tables context
        call_args = classifier._client.chat.completions.create.call_args
        user_msg = call_args[1]["messages"][1]["content"]
        assert "CreditFileVersion" in user_msg

    def test_low_confidence_sets_requires_clarification(self, classifier):
        mock_response = Mock()
        mock_response.choices = [
            Mock(message=Mock(content='{"intent": "DATABASE_QUERY", "confidence": 0.4, "reasoning": "Not sure"}'))
        ]
        classifier._client.chat.completions.create.return_value = mock_response

        result = classifier.classify("bilgi ver")
        assert result.confidence == 0.4
        assert result.requires_clarification is True

    def test_high_confidence_no_clarification(self, classifier):
        mock_response = Mock()
        mock_response.choices = [
            Mock(message=Mock(content='{"intent": "DOCUMENT_QUERY", "confidence": 0.95, "reasoning": "Clear question"}'))
        ]
        classifier._client.chat.completions.create.return_value = mock_response

        result = classifier.classify("Atlas ERP nedir?")
        assert result.confidence == 0.95
        assert result.requires_clarification is False

    def test_classify_json_with_code_fence(self, classifier):
        # Test that JSON wrapped in code fences is parsed correctly
        mock_response = Mock()
        mock_response.choices = [
            Mock(message=Mock(content='```json\n{"intent": "CONVERSATIONAL", "confidence": 0.9, "reasoning": "Greeting"}\n```'))
        ]
        classifier._client.chat.completions.create.return_value = mock_response

        result = classifier.classify("Merhaba!")
        assert result.intent == IntentType.CONVERSATIONAL

    def test_classify_batch(self, classifier):
        mock_response = Mock()
        mock_response.choices = [
            Mock(message=Mock(content='{"intent": "DOCUMENT_QUERY", "confidence": 0.8, "reasoning": "test"}'))
        ]
        classifier._client.chat.completions.create.return_value = mock_response

        results = classifier.classify_batch(["q1", "q2", "q3"])
        assert len(results) == 3
        assert all(isinstance(r, ClassificationResult) for r in results)

    def test_classification_time_recorded(self, classifier):
        mock_response = Mock()
        mock_response.choices = [
            Mock(message=Mock(content='{"intent": "DOCUMENT_QUERY", "confidence": 0.8, "reasoning": "test"}'))
        ]
        classifier._client.chat.completions.create.return_value = mock_response

        result = classifier.classify("test query")
        assert result.classification_time_ms >= 0