import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).parent.parent / "src"))

import pytest
import numpy as np
from unittest.mock import Mock, patch, MagicMock


class TestTurkishEmbedder:
    """Tests for TurkishEmbedder class."""
    
    @patch("embeddings.SentenceTransformer")
    def test_lazy_loading(self, mock_st):
        """Model should not load until first use."""
        from embeddings import TurkishEmbedder, reset_embedder
        reset_embedder()
        
        embedder = TurkishEmbedder()
        mock_st.assert_not_called()
        
        _ = embedder.model
        mock_st.assert_called_once()
    
    @patch("embeddings.SentenceTransformer")
    def test_embed_documents_adds_prefix(self, mock_st):
        """Documents should be prefixed with 'passage:'."""
        from embeddings import TurkishEmbedder, reset_embedder
        reset_embedder()
        
        mock_model = MagicMock()
        mock_model.encode.return_value = np.array([[0.1, 0.2], [0.3, 0.4]])
        mock_st.return_value = mock_model
        
        embedder = TurkishEmbedder()
        embedder.embed_documents(["test1", "test2"])
        
        call_args = mock_model.encode.call_args[0][0]
        assert call_args == ["passage: test1", "passage: test2"]
    
    @patch("embeddings.SentenceTransformer")
    def test_embed_query_adds_prefix(self, mock_st):
        """Query should be prefixed with 'query:'."""
        from embeddings import TurkishEmbedder, reset_embedder
        reset_embedder()
        
        mock_model = MagicMock()
        mock_model.encode.return_value = np.array([0.1, 0.2])
        mock_st.return_value = mock_model
        
        embedder = TurkishEmbedder()
        embedder.embed_query("test query")
        
        call_args = mock_model.encode.call_args[0][0]
        assert call_args == "query: test query"
    
    @patch("embeddings.SentenceTransformer")
    def test_query_and_document_prefix_differ(self, mock_st):
        """Query and document prefixes should be different."""
        from embeddings import TurkishEmbedder, reset_embedder
        reset_embedder()
        
        mock_model = MagicMock()
        mock_model.encode.return_value = np.array([0.1, 0.2])
        mock_st.return_value = mock_model
        
        embedder = TurkishEmbedder()
        
        embedder.embed_query("test")
        query_prefix = mock_model.encode.call_args[0][0]
        
        mock_model.encode.return_value = np.array([[0.1, 0.2]])
        embedder.embed_documents(["test"])
        doc_prefix = mock_model.encode.call_args[0][0][0]
        
        assert query_prefix != doc_prefix
        assert query_prefix.startswith("query:")
        assert doc_prefix.startswith("passage:")
    
    @patch("embeddings.SentenceTransformer")
    def test_embed_documents_empty_list(self, mock_st):
        """Empty input should return empty list."""
        from embeddings import TurkishEmbedder, reset_embedder
        reset_embedder()
        
        embedder = TurkishEmbedder()
        result = embedder.embed_documents([])
        
        assert result == []
        mock_st.assert_not_called()
    
    @patch("embeddings.SentenceTransformer")
    def test_embed_documents_returns_list(self, mock_st):
        """Should return list of lists."""
        from embeddings import TurkishEmbedder, reset_embedder
        reset_embedder()
        
        mock_model = MagicMock()
        mock_model.encode.return_value = np.array([[0.1, 0.2], [0.3, 0.4]])
        mock_st.return_value = mock_model
        
        embedder = TurkishEmbedder()
        result = embedder.embed_documents(["a", "b"])
        
        assert isinstance(result, list)
        assert isinstance(result[0], list)
    
    @patch("embeddings.SentenceTransformer")
    def test_embed_passages_returns_numpy(self, mock_st):
        """embed_passages should return numpy array."""
        from embeddings import TurkishEmbedder, reset_embedder
        reset_embedder()
        
        mock_model = MagicMock()
        mock_model.encode.return_value = np.array([[0.1, 0.2]])
        mock_st.return_value = mock_model
        
        embedder = TurkishEmbedder()
        result = embedder.embed_passages(["test"])
        
        assert isinstance(result, np.ndarray)


class TestSingleton:
    """Tests for singleton pattern."""
    
    @patch("embeddings.SentenceTransformer")
    def test_get_embedder_returns_same_instance(self, mock_st):
        """get_embedder should return the same instance."""
        from embeddings import get_embedder, reset_embedder
        reset_embedder()
        
        instance1 = get_embedder()
        instance2 = get_embedder()
        
        assert instance1 is instance2
    
    @patch("embeddings.SentenceTransformer")
    def test_reset_embedder_clears_instance(self, mock_st):
        """reset_embedder should clear the singleton."""
        from embeddings import get_embedder, reset_embedder
        reset_embedder()
        
        instance1 = get_embedder()
        reset_embedder()
        instance2 = get_embedder()
        
        assert instance1 is not instance2