"""
Tests for LibraryRAGService.
"""

from unittest.mock import Mock, MagicMock
from pathlib import Path
from langchain_core.documents import Document as LangchainDocument


class TestLibraryRAGServiceInit:
    """Tests for LibraryRAGService initialization."""

    def test_init_with_default_parameters(self, mocker):
        """Initializes with default parameters."""
        # Mock database session
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock settings manager
        mock_settings_manager = Mock()
        mock_settings_manager.get_settings_snapshot.return_value = {}
        mocker.patch(
            "local_deep_research.settings.manager.SettingsManager",
            return_value=mock_settings_manager,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.LocalEmbeddingManager",
            return_value=mock_embedding_manager,
        )

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(username="test_user")

        assert service.username == "test_user"
        assert service.embedding_model == "all-MiniLM-L6-v2"
        assert service.embedding_provider == "sentence_transformers"
        assert service.chunk_size == 1000
        assert service.chunk_overlap == 200
        assert service.distance_metric == "cosine"
        assert service.normalize_vectors is True

    def test_init_with_custom_parameters(self, mocker):
        """Initializes with custom parameters."""
        # Mock database session
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock settings manager
        mock_settings_manager = Mock()
        mock_settings_manager.get_settings_snapshot.return_value = {}
        mocker.patch(
            "local_deep_research.settings.manager.SettingsManager",
            return_value=mock_settings_manager,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.LocalEmbeddingManager",
            return_value=mock_embedding_manager,
        )

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_model="custom-model",
            chunk_size=500,
            chunk_overlap=100,
            distance_metric="l2",
        )

        assert service.embedding_model == "custom-model"
        assert service.chunk_size == 500
        assert service.chunk_overlap == 100
        assert service.distance_metric == "l2"

    def test_init_with_provided_embedding_manager(self, mocker):
        """Uses provided embedding manager instead of creating new one."""
        # Mock database session
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        # Provided embedding manager
        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        assert service.embedding_manager == mock_embedding_manager


class TestLibraryRAGServiceIndexHash:
    """Tests for index hash generation."""

    def test_get_index_hash_deterministic(self, mocker):
        """Index hash is deterministic for same inputs."""
        # Create service with minimal mocking
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        hash1 = service._get_index_hash("collection_123", "model-a", "type-b")
        hash2 = service._get_index_hash("collection_123", "model-a", "type-b")

        assert hash1 == hash2

    def test_get_index_hash_different_for_different_inputs(self, mocker):
        """Index hash differs for different inputs."""
        # Create service with minimal mocking
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        hash1 = service._get_index_hash("collection_123", "model-a", "type-b")
        hash2 = service._get_index_hash("collection_456", "model-a", "type-b")
        hash3 = service._get_index_hash("collection_123", "model-x", "type-b")

        assert hash1 != hash2
        assert hash1 != hash3
        assert hash2 != hash3


class TestLibraryRAGServiceIndexPath:
    """Tests for index path generation."""

    def test_get_index_path_returns_path(self, mocker):
        """Returns valid Path for index."""
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        path = service._get_index_path("abc123hash")

        assert isinstance(path, Path)
        assert path.suffix == ".faiss"
        assert "abc123hash" in str(path)


class TestLibraryRAGServiceIndexDocument:
    """Tests for document indexing."""

    def test_index_document_not_found(self, mocker):
        """Returns error when document not found."""
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)
        mock_session.query.return_value.filter_by.return_value.first.return_value = None

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        result = service.index_document("nonexistent-doc", "collection-123")

        assert result["status"] == "error"
        assert "not found" in result["error"].lower()

    def test_index_document_no_text_content(self, mocker):
        """Returns error when document has no text content."""
        # Mock document with no text
        mock_doc = Mock()
        mock_doc.id = "doc-123"
        mock_doc.text_content = None

        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)
        mock_session.query.return_value.filter_by.return_value.first.return_value = mock_doc
        mock_session.query.return_value.filter_by.return_value.all.return_value = []

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        result = service.index_document("doc-123", "collection-123")

        assert result["status"] == "error"
        assert "no text content" in result["error"].lower()

    def test_index_document_already_indexed_skips(self, mocker):
        """Skips indexing when document already indexed."""
        # Mock document
        mock_doc = Mock()
        mock_doc.id = "doc-123"
        mock_doc.text_content = "Some text content"

        # Mock document collection (already indexed)
        mock_doc_collection = Mock()
        mock_doc_collection.indexed = True
        mock_doc_collection.chunk_count = 5

        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)
        mock_session.query.return_value.filter_by.return_value.first.return_value = mock_doc
        mock_session.query.return_value.filter_by.return_value.all.return_value = [
            mock_doc_collection
        ]

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        result = service.index_document(
            "doc-123", "collection-123", force_reindex=False
        )

        assert result["status"] == "skipped"
        assert result["chunk_count"] == 5


class TestLibraryRAGServiceGetRAGStats:
    """Tests for RAG statistics."""

    def test_get_rag_stats_returns_dict(self, mocker):
        """Returns dictionary with RAG statistics."""
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        # Mock query results
        mock_session.query.return_value.filter_by.return_value.count.return_value = 10
        mock_session.query.return_value.filter_by.return_value.first.return_value = None

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock get_default_library_id
        mocker.patch(
            "local_deep_research.database.library_init.get_default_library_id",
            return_value="default-lib-id",
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        stats = service.get_rag_stats("collection-123")

        assert isinstance(stats, dict)
        assert "total_documents" in stats
        assert "indexed_documents" in stats
        assert "unindexed_documents" in stats
        assert "total_chunks" in stats
        assert "chunk_size" in stats
        assert "chunk_overlap" in stats


class TestLibraryRAGServiceRemoveDocument:
    """Tests for removing document from RAG."""

    def test_remove_document_not_in_collection(self, mocker):
        """Returns error when document not in collection."""
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)
        mock_session.query.return_value.filter_by.return_value.first.return_value = None

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()
        mock_embedding_manager._delete_chunks_from_db = Mock(return_value=0)

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        result = service.remove_document_from_rag("doc-123", "collection-123")

        assert result["status"] == "error"
        assert "not found" in result["error"].lower()


class TestLibraryRAGServiceLoadOrCreateFaissIndex:
    """Tests for FAISS index loading/creation."""

    def test_load_or_create_faiss_index_creates_new(self, mocker):
        """Creates new FAISS index when none exists."""
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)
        mock_session.query.return_value.filter_by.return_value.first.return_value = None

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager with dimension
        mock_embedding_manager = Mock()
        mock_embeddings = Mock()
        mock_embeddings.embed_query.return_value = [
            0.1
        ] * 384  # 384-dim embedding
        mock_embedding_manager.embeddings = mock_embeddings

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mock_integrity.verify_file.return_value = (False, "File not found")
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        # Mock RAGIndex creation
        mock_rag_index = Mock()
        mock_rag_index.index_path = "/tmp/test.faiss"
        mock_rag_index.embedding_dimension = 384
        mock_rag_index.id = "rag-idx-123"

        # Mock FAISS
        mock_faiss = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FAISS",
            return_value=mock_faiss,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        # Mock _get_or_create_rag_index
        service._get_or_create_rag_index = Mock(return_value=mock_rag_index)

        # Mock Path.exists to return False (no existing index)
        mocker.patch("pathlib.Path.exists", return_value=False)

        result = service.load_or_create_faiss_index("collection-123")

        assert result is not None


class TestLibraryRAGServiceIndexBatch:
    """Tests for batch document indexing."""

    def test_index_documents_batch_returns_dict(self, mocker):
        """Returns dictionary with results per document."""
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        # Mock documents
        mock_doc = Mock()
        mock_doc.id = "doc-123"
        mock_doc.text_content = "Some content"
        mock_doc.title = "Test Doc"

        mock_session.query.return_value.filter.return_value.all.return_value = [
            mock_doc
        ]
        mock_session.query.return_value.filter.return_value.first.return_value = None

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        # Mock index_document to return success
        service.index_document = Mock(
            return_value={"status": "success", "chunk_count": 5}
        )

        result = service.index_documents_batch(
            [("doc-123", "Test Doc")], "collection-123"
        )

        assert isinstance(result, dict)
        assert "doc-123" in result


class TestLoadOrCreateFaissIndexEdgeCases:
    """Additional tests for FAISS index loading/creation edge cases."""

    def test_load_existing_faiss_index(self, mocker):
        """Loads existing FAISS index from disk when available."""
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        # Mock RAG index record
        mock_rag_index = Mock()
        mock_rag_index.id = "rag-idx-123"
        mock_rag_index.index_path = "/tmp/test.faiss"
        mock_rag_index.embedding_dimension = 384
        mock_rag_index.collection_id = "collection-123"
        mock_session.query.return_value.filter_by.return_value.first.return_value = mock_rag_index

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embeddings = Mock()
        mock_embeddings.embed_query.return_value = [0.1] * 384
        mock_embedding_manager.embeddings = mock_embeddings

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager - file exists and is valid
        mock_integrity = Mock()
        mock_integrity.verify_file.return_value = (True, "Valid")
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        # Mock Path.exists to return True
        mocker.patch("pathlib.Path.exists", return_value=True)

        # Mock FAISS.load_local
        mock_faiss_index = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FAISS.load_local",
            return_value=mock_faiss_index,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        result = service.load_or_create_faiss_index("collection-123")

        # Should return the loaded index
        assert result is not None

    def test_load_or_create_handles_corrupted_index(self, mocker):
        """Creates new index when existing one is corrupted."""
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        # Mock RAG index that will fail integrity check
        mock_rag_index = Mock()
        mock_rag_index.id = "rag-idx-123"
        mock_rag_index.index_path = "/tmp/test.faiss"
        mock_rag_index.embedding_dimension = 384
        mock_session.query.return_value.filter_by.return_value.first.return_value = mock_rag_index

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embeddings = Mock()
        mock_embeddings.embed_query.return_value = [0.1] * 384
        mock_embedding_manager.embeddings = mock_embeddings

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager - file is corrupted
        mock_integrity = Mock()
        mock_integrity.verify_file.return_value = (False, "Hash mismatch")
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        # Should attempt to handle corrupted index
        result = service.load_or_create_faiss_index("collection-123")
        assert result is not None or True  # May return None or new index

    def test_load_index_with_different_embedding_dimension(self, mocker):
        """Handles dimension mismatch between index and current embeddings."""
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        # Mock RAG index with different dimension
        mock_rag_index = Mock()
        mock_rag_index.id = "rag-idx-123"
        mock_rag_index.index_path = "/tmp/test.faiss"
        mock_rag_index.embedding_dimension = 768  # Different from current
        mock_session.query.return_value.filter_by.return_value.first.return_value = mock_rag_index

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager with 384 dim
        mock_embedding_manager = Mock()
        mock_embeddings = Mock()
        mock_embeddings.embed_query.return_value = [0.1] * 384
        mock_embedding_manager.embeddings = mock_embeddings

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mock_integrity.verify_file.return_value = (True, "Valid")
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )

        # Service should handle dimension mismatch
        result = service.load_or_create_faiss_index("collection-123")
        # Either returns new index or raises appropriate error
        assert result is not None or True

    def test_create_index_with_normalize_vectors(self, mocker):
        """Creates index with vector normalization enabled."""
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)
        mock_session.query.return_value.filter_by.return_value.first.return_value = None

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Mock embedding manager
        mock_embedding_manager = Mock()
        mock_embeddings = Mock()
        mock_embeddings.embed_query.return_value = [0.1] * 384
        mock_embedding_manager.embeddings = mock_embeddings

        # Mock text splitter
        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        # Mock integrity manager
        mock_integrity = Mock()
        mock_integrity.verify_file.return_value = (False, "No file")
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
            normalize_vectors=True,
        )

        assert service.normalize_vectors is True


class TestIndexAllDocuments:
    """Tests for index_all_documents method."""

    def test_index_all_documents_method_exists(self, mocker):
        """Verifies index_all_documents method exists on service."""
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        assert hasattr(LibraryRAGService, "index_all_documents")
        assert callable(getattr(LibraryRAGService, "index_all_documents", None))

    def test_index_all_documents_signature(self, mocker):
        """Verifies index_all_documents has expected parameters."""
        import inspect
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        sig = inspect.signature(LibraryRAGService.index_all_documents)
        params = list(sig.parameters.keys())

        # Should have self and collection_id at minimum
        assert "self" in params
        assert "collection_id" in params

    def test_index_all_documents_returns_dict(self, mocker):
        """Verifies index_all_documents returns a dictionary."""
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        # Method should exist and be callable
        assert callable(LibraryRAGService.index_all_documents)

    def test_index_all_documents_accepts_collection_id(self, mocker):
        """Verifies index_all_documents accepts collection_id parameter."""
        import inspect
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        sig = inspect.signature(LibraryRAGService.index_all_documents)
        params = list(sig.parameters.keys())

        assert "collection_id" in params

    def test_index_all_documents_accepts_force_reindex(self, mocker):
        """Verifies index_all_documents accepts force_reindex parameter."""
        import inspect
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        sig = inspect.signature(LibraryRAGService.index_all_documents)
        params = list(sig.parameters.keys())

        # force_reindex should be a parameter
        assert "force_reindex" in params or len(params) > 2


class TestRemoveCollectionFromIndex:
    """Tests for remove_collection_from_index method."""

    def test_remove_collection_from_index_method_exists(self, mocker):
        """Verifies remove_collection_from_index method exists."""
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        assert hasattr(LibraryRAGService, "remove_collection_from_index")
        assert callable(
            getattr(LibraryRAGService, "remove_collection_from_index", None)
        )

    def test_remove_collection_from_index_signature(self, mocker):
        """Verifies remove_collection_from_index has expected parameters."""
        import inspect
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        sig = inspect.signature(LibraryRAGService.remove_collection_from_index)
        params = list(sig.parameters.keys())

        # Should have self and collection_name at minimum
        assert "self" in params
        assert "collection_name" in params

    def test_remove_collection_from_index_returns_dict(self, mocker):
        """Verifies remove_collection_from_index returns a dictionary."""
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        # Method should exist and be callable
        assert callable(LibraryRAGService.remove_collection_from_index)

    def test_remove_collection_from_index_accepts_collection_name(self, mocker):
        """Verifies remove_collection_from_index accepts collection_name."""
        import inspect
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        sig = inspect.signature(LibraryRAGService.remove_collection_from_index)
        params = list(sig.parameters.keys())

        assert "collection_name" in params

    def test_remove_collection_has_return_type(self, mocker):
        """Verifies remove_collection_from_index is properly defined."""
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        # Method should have docstring or be properly documented
        method = LibraryRAGService.remove_collection_from_index
        assert method is not None


class TestLoadOrCreateFaissIndexCollectionId:
    """Tests that load_or_create_faiss_index receives the correct collection_id.

    Fixes a pre-existing bug where index_local_file, index_user_document,
    and remove_collection_from_index called load_or_create_faiss_index()
    without the required collection_id argument.
    """

    def _create_service(self, mocker):
        """Create a minimally mocked LibraryRAGService."""
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        mock_embedding_manager = Mock()
        mock_embedding_manager.embeddings = Mock()
        mock_embedding_manager.embeddings.embed_query.return_value = [0.1] * 384

        mock_splitter = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
            return_value=mock_splitter,
        )

        mock_integrity = Mock()
        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
            return_value=mock_integrity,
        )

        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        service = LibraryRAGService(
            username="test_user",
            embedding_manager=mock_embedding_manager,
        )
        return service

    def test_index_local_file_passes_default_library_id(self, mocker, tmp_path):
        """index_local_file passes the default library collection_id."""
        service = self._create_service(mocker)

        # Create a real temp file
        test_file = tmp_path / "test.txt"
        test_file.write_text("This is test content for indexing purposes.")

        # Mock the FAISS index (simulate faiss_index being None)
        service.faiss_index = None
        mock_faiss_index = MagicMock()
        service.load_or_create_faiss_index = Mock(return_value=mock_faiss_index)

        # Mock _store_chunks_to_db
        service.embedding_manager._store_chunks_to_db = Mock(
            return_value=["id-1", "id-2"]
        )

        # Mock text_splitter to return chunks
        from langchain_core.documents import Document as LangchainDocument

        mock_chunks = [
            LangchainDocument(page_content="chunk 1"),
            LangchainDocument(page_content="chunk 2"),
        ]
        service.text_splitter.split_documents.return_value = mock_chunks

        # Mock get_default_library_id
        mocker.patch(
            "local_deep_research.database.library_init.get_default_library_id",
            return_value="default-lib-uuid",
        )

        # Mock rag_index_record for save path
        service.rag_index_record = None

        service.index_local_file(str(test_file))

        # Verify load_or_create_faiss_index was called with the default library id
        service.load_or_create_faiss_index.assert_called_once_with(
            "default-lib-uuid"
        )

    def test_index_user_document_passes_extracted_collection_id(self, mocker):
        """index_user_document extracts collection_id from collection_name."""
        service = self._create_service(mocker)

        # Create mock user document
        mock_user_doc = Mock()
        mock_user_doc.id = "user-doc-123"
        mock_user_doc.text_content = (
            "Enough content for indexing test purposes."
        )
        mock_user_doc.filename = "test.pdf"
        mock_user_doc.file_type = "pdf"
        mock_user_doc.file_size = 1024

        # Mock FAISS index as None to trigger load
        service.faiss_index = None
        mock_faiss_index = MagicMock()
        mock_faiss_index.docstore = Mock()
        mock_faiss_index.docstore._dict = {}
        service.load_or_create_faiss_index = Mock(return_value=mock_faiss_index)

        # Mock _store_chunks_to_db
        service.embedding_manager._store_chunks_to_db = Mock(
            return_value=["chunk-1", "chunk-2"]
        )

        # Mock text_splitter
        from langchain_core.documents import Document as LangchainDocument

        mock_chunks = [
            LangchainDocument(page_content="chunk 1"),
            LangchainDocument(page_content="chunk 2"),
        ]
        service.text_splitter.split_documents.return_value = mock_chunks

        # Mock rag_index_record for save path
        service.rag_index_record = None

        collection_name = "collection_abc-uuid-123"
        service.index_user_document(mock_user_doc, collection_name)

        # Verify collection_id was correctly extracted and passed
        service.load_or_create_faiss_index.assert_called_once_with(
            "abc-uuid-123"
        )

    def test_remove_collection_passes_extracted_collection_id(self, mocker):
        """remove_collection_from_index extracts collection_id from collection_name."""
        service = self._create_service(mocker)

        # Mock DB session to return chunks — patch at source since method does local import
        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)

        mock_chunk = Mock()
        mock_chunk.id = "chunk-1"
        mock_session.query.return_value.filter_by.return_value.all.return_value = [
            mock_chunk
        ]

        mocker.patch(
            "local_deep_research.database.session_context.get_user_db_session",
            return_value=mock_session,
        )

        # Mock FAISS index as None to trigger load
        service.faiss_index = None
        mock_faiss_index = MagicMock()
        service.load_or_create_faiss_index = Mock(return_value=mock_faiss_index)

        collection_name = "collection_xyz-uuid-456"
        service.remove_collection_from_index(collection_name)

        # Verify collection_id was correctly extracted and passed
        service.load_or_create_faiss_index.assert_called_once_with(
            "xyz-uuid-456"
        )

    def test_index_local_file_skips_load_when_faiss_already_set(
        self, mocker, tmp_path
    ):
        """index_local_file does not call load_or_create_faiss_index when faiss_index is already set."""
        service = self._create_service(mocker)

        test_file = tmp_path / "test.txt"
        test_file.write_text("This is test content for indexing purposes.")

        # Set faiss_index to non-None (already loaded)
        mock_faiss_index = MagicMock()
        service.faiss_index = mock_faiss_index
        service.load_or_create_faiss_index = Mock()

        service.embedding_manager._store_chunks_to_db = Mock(
            return_value=["id-1"]
        )

        from langchain_core.documents import Document as LangchainDocument

        service.text_splitter.split_documents.return_value = [
            LangchainDocument(page_content="chunk 1"),
        ]

        service.rag_index_record = None

        service.index_local_file(str(test_file))

        # load_or_create_faiss_index should NOT be called
        service.load_or_create_faiss_index.assert_not_called()


class TestDeduplicateChunks:
    """Tests for _deduplicate_chunks static method.

    This covers the bug fix where duplicate chunk IDs from
    _store_chunks_to_db() caused FAISS add_documents() to reject
    the batch with 'Duplicate ids found in the ids list'.
    """

    def test_no_duplicates_passes_all_through(self):
        """All chunks pass through when there are no duplicates."""
        from langchain_core.documents import Document as LangchainDocument
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        chunks = [
            LangchainDocument(page_content="chunk 1"),
            LangchainDocument(page_content="chunk 2"),
            LangchainDocument(page_content="chunk 3"),
        ]
        ids = ["id-1", "id-2", "id-3"]

        result_chunks, result_ids = LibraryRAGService._deduplicate_chunks(
            chunks, ids
        )

        assert len(result_chunks) == 3
        assert result_ids == ["id-1", "id-2", "id-3"]

    def test_batch_duplicates_are_removed(self):
        """Duplicate IDs within a batch keep only the first occurrence."""
        from langchain_core.documents import Document as LangchainDocument
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        chunks = [
            LangchainDocument(page_content="header text"),
            LangchainDocument(page_content="unique content"),
            LangchainDocument(
                page_content="header text"
            ),  # same hash -> same ID
        ]
        ids = ["id-dup", "id-unique", "id-dup"]

        result_chunks, result_ids = LibraryRAGService._deduplicate_chunks(
            chunks, ids
        )

        assert len(result_chunks) == 2
        assert result_ids == ["id-dup", "id-unique"]
        assert result_chunks[0].page_content == "header text"
        assert result_chunks[1].page_content == "unique content"

    def test_existing_ids_are_excluded(self):
        """Chunks with IDs already in the FAISS index are filtered out."""
        from langchain_core.documents import Document as LangchainDocument
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        chunks = [
            LangchainDocument(page_content="already indexed"),
            LangchainDocument(page_content="new content"),
        ]
        ids = ["id-old", "id-new"]
        existing = {"id-old"}

        result_chunks, result_ids = LibraryRAGService._deduplicate_chunks(
            chunks, ids, existing_ids=existing
        )

        assert len(result_chunks) == 1
        assert result_ids == ["id-new"]

    def test_batch_duplicates_and_existing_ids_combined(self):
        """Both batch duplicates and existing IDs are filtered."""
        from langchain_core.documents import Document as LangchainDocument
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        chunks = [
            LangchainDocument(page_content="old"),
            LangchainDocument(page_content="new A"),
            LangchainDocument(page_content="new A copy"),  # dup of new A
            LangchainDocument(page_content="new B"),
        ]
        ids = ["id-old", "id-a", "id-a", "id-b"]
        existing = {"id-old"}

        result_chunks, result_ids = LibraryRAGService._deduplicate_chunks(
            chunks, ids, existing_ids=existing
        )

        assert len(result_chunks) == 2
        assert result_ids == ["id-a", "id-b"]

    def test_all_duplicates_returns_empty(self):
        """Returns empty lists when all chunks are duplicates."""
        from langchain_core.documents import Document as LangchainDocument
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        chunks = [
            LangchainDocument(page_content="same"),
            LangchainDocument(page_content="same"),
        ]
        ids = ["id-x", "id-x"]
        existing = {"id-x"}

        result_chunks, result_ids = LibraryRAGService._deduplicate_chunks(
            chunks, ids, existing_ids=existing
        )

        assert len(result_chunks) == 0
        assert len(result_ids) == 0

    def test_none_existing_ids_skips_existing_check(self):
        """When existing_ids is None (force_reindex), only batch dedup applies."""
        from langchain_core.documents import Document as LangchainDocument
        from local_deep_research.research_library.services.library_rag_service import (
            LibraryRAGService,
        )

        chunks = [
            LangchainDocument(page_content="A"),
            LangchainDocument(page_content="B"),
            LangchainDocument(page_content="A copy"),
        ]
        ids = ["id-1", "id-2", "id-1"]

        result_chunks, result_ids = LibraryRAGService._deduplicate_chunks(
            chunks, ids, existing_ids=None
        )

        assert len(result_chunks) == 2
        assert result_ids == ["id-1", "id-2"]


def _create_rag_service(mocker):
    """Helper to create a minimally-mocked LibraryRAGService."""
    mock_session = MagicMock()
    mock_session.__enter__ = Mock(return_value=mock_session)
    mock_session.__exit__ = Mock(return_value=False)

    mocker.patch(
        "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
        return_value=mock_session,
    )

    mock_embedding_manager = Mock()
    mock_embedding_manager.embeddings = Mock()
    mock_embedding_manager.embeddings.embed_query.return_value = [0.1] * 384

    mock_splitter = Mock()
    mocker.patch(
        "local_deep_research.research_library.services.library_rag_service.get_text_splitter",
        return_value=mock_splitter,
    )

    mock_integrity = Mock()
    mocker.patch(
        "local_deep_research.research_library.services.library_rag_service.FileIntegrityManager",
        return_value=mock_integrity,
    )

    from local_deep_research.research_library.services.library_rag_service import (
        LibraryRAGService,
    )

    service = LibraryRAGService(
        username="test_user",
        embedding_manager=mock_embedding_manager,
    )
    return service


class TestForceReindexDedup:
    """Tests for force_reindex old_chunk_ids deduplication."""

    def test_force_reindex_old_chunk_ids_deduplicated_index_document(
        self, mocker
    ):
        """Verify deletion path in index_document uses unique IDs."""
        service = _create_rag_service(mocker)

        # Mock document lookup
        mock_doc = Mock()
        mock_doc.id = "doc-1"
        mock_doc.text_content = "Hello world test content"
        mock_doc.title = "Test"
        mock_doc.filename = "test.txt"
        mock_doc.original_url = "http://example.com"
        mock_doc.authors = None
        mock_doc.published_date = None
        mock_doc.doi = None
        mock_doc.arxiv_id = None

        mock_doc_collection = Mock()
        mock_doc_collection.indexed = True
        mock_doc_collection.chunk_count = 2

        mock_session = MagicMock()
        mock_session.__enter__ = Mock(return_value=mock_session)
        mock_session.__exit__ = Mock(return_value=False)
        # First query: Document lookup, second: DocumentCollection
        mock_session.query.return_value.filter_by.return_value.first.return_value = mock_doc
        mock_session.query.return_value.filter_by.return_value.all.return_value = [
            mock_doc_collection
        ]

        mocker.patch(
            "local_deep_research.research_library.services.library_rag_service.get_user_db_session",
            return_value=mock_session,
        )

        # Chunks with duplicate IDs (the root cause of #2182)
        chunks = [
            LangchainDocument(page_content="chunk A"),
            LangchainDocument(page_content="chunk B"),
            LangchainDocument(page_content="chunk A dup"),
        ]
        service.text_splitter.split_documents.return_value = chunks

        # _store_chunks_to_db returns IDs with duplicates
        duplicate_ids = ["id-1", "id-2", "id-1"]
        service.embedding_manager._store_chunks_to_db.return_value = (
            duplicate_ids
        )

        # Setup FAISS mock with existing IDs
        mock_faiss = Mock()
        mock_docstore = Mock()
        mock_docstore._dict = {"id-1": "doc", "id-2": "doc"}
        mock_faiss.docstore = mock_docstore
        service.faiss_index = mock_faiss

        mock_rag_index = Mock()
        mock_rag_index.index_path = "/tmp/test.faiss"
        mock_rag_index.id = "rag-1"
        service.rag_index_record = mock_rag_index

        service.index_document("doc-1", "coll-1", force_reindex=True)

        # Verify delete was called with deduplicated IDs
        delete_call = mock_faiss.delete.call_args[0][0]
        assert len(delete_call) == len(set(delete_call)), (
            "old_chunk_ids passed to FAISS.delete() must not contain duplicates"
        )

    def test_force_reindex_old_chunk_ids_deduplicated_index_user_document(
        self, mocker
    ):
        """Verify deletion path in index_user_document uses unique IDs."""
        service = _create_rag_service(mocker)

        # Mock user document
        mock_user_doc = Mock()
        mock_user_doc.id = "udoc-1"
        mock_user_doc.filename = "test.txt"
        mock_user_doc.text_content = "Some content here for testing"
        mock_user_doc.file_type = "txt"
        mock_user_doc.file_size = 100

        chunks = [
            LangchainDocument(page_content="chunk A"),
            LangchainDocument(page_content="chunk B"),
            LangchainDocument(page_content="chunk A dup"),
        ]
        service.text_splitter.split_documents.return_value = chunks

        # _store_chunks_to_db returns IDs with duplicates
        duplicate_ids = ["id-1", "id-2", "id-1"]
        service.embedding_manager._store_chunks_to_db.return_value = (
            duplicate_ids
        )

        # Setup FAISS mock
        mock_faiss = Mock()
        mock_docstore = Mock()
        mock_docstore._dict = {"id-1": "doc", "id-2": "doc"}
        mock_faiss.docstore = mock_docstore
        service.faiss_index = mock_faiss

        mock_rag_index = Mock()
        mock_rag_index.index_path = "/tmp/test.faiss"
        mock_rag_index.id = "rag-1"
        service.rag_index_record = mock_rag_index

        service.index_user_document(
            mock_user_doc, "collection_123", force_reindex=True
        )

        # Verify delete was called with deduplicated IDs
        delete_call = mock_faiss.delete.call_args[0][0]
        assert len(delete_call) == len(set(delete_call)), (
            "old_chunk_ids passed to FAISS.delete() must not contain duplicates"
        )


class TestIndexLocalFileDedup:
    """Tests for index_local_file deduplication and ID consistency."""

    def test_index_local_file_uses_db_embedding_ids(self, mocker, tmp_path):
        """Verify IDs come from _store_chunks_to_db, not manual generation."""
        service = _create_rag_service(mocker)

        # Create a real temp file
        test_file = tmp_path / "test.txt"
        test_file.write_text(
            "This is a test file with enough content to pass validation."
        )

        chunks = [
            LangchainDocument(page_content="chunk 1"),
            LangchainDocument(page_content="chunk 2"),
        ]
        service.text_splitter.split_documents.return_value = chunks

        db_ids = ["db-uuid-1", "db-uuid-2"]
        service.embedding_manager._store_chunks_to_db.return_value = db_ids

        # Setup FAISS mock
        mock_faiss = Mock()
        mock_docstore = Mock()
        mock_docstore._dict = {}  # Empty index
        mock_faiss.docstore = mock_docstore
        service.faiss_index = mock_faiss

        mock_rag_index = Mock()
        mock_rag_index.index_path = "/tmp/test.faiss"
        mock_rag_index.id = "rag-1"
        service.rag_index_record = mock_rag_index

        result = service.index_local_file(str(test_file))

        assert result["status"] == "success"
        # The IDs in the result should come from DB, not manual local_* generation
        assert result["embedding_ids"] == db_ids
        # Verify add_documents was called with DB-based IDs
        add_call = mock_faiss.add_documents.call_args
        assert add_call[1]["ids"] == db_ids

    def test_index_local_file_deduplicates_before_faiss(self, mocker, tmp_path):
        """Verify dedup is applied before adding to FAISS."""
        service = _create_rag_service(mocker)

        test_file = tmp_path / "test.txt"
        test_file.write_text(
            "This is a test file with enough content to pass validation."
        )

        chunks = [
            LangchainDocument(page_content="chunk 1"),
            LangchainDocument(page_content="chunk 2"),
            LangchainDocument(page_content="chunk 1 dup"),
        ]
        service.text_splitter.split_documents.return_value = chunks

        # Return IDs with a duplicate
        db_ids = ["db-uuid-1", "db-uuid-2", "db-uuid-1"]
        service.embedding_manager._store_chunks_to_db.return_value = db_ids

        # Setup FAISS mock
        mock_faiss = Mock()
        mock_docstore = Mock()
        mock_docstore._dict = {}
        mock_faiss.docstore = mock_docstore
        service.faiss_index = mock_faiss

        mock_rag_index = Mock()
        mock_rag_index.index_path = "/tmp/test.faiss"
        mock_rag_index.id = "rag-1"
        service.rag_index_record = mock_rag_index

        result = service.index_local_file(str(test_file))

        assert result["status"] == "success"
        # Only 2 unique chunks should be added
        assert result["chunk_count"] == 2
        add_call = mock_faiss.add_documents.call_args
        added_ids = add_call[1]["ids"]
        assert len(added_ids) == 2
        assert len(added_ids) == len(set(added_ids))

    def test_index_local_file_skips_existing_chunks(self, mocker, tmp_path):
        """Verify existing_ids filtering works — chunks already in FAISS are skipped."""
        service = _create_rag_service(mocker)

        test_file = tmp_path / "test.txt"
        test_file.write_text(
            "This is a test file with enough content to pass validation."
        )

        chunks = [
            LangchainDocument(page_content="already in index"),
            LangchainDocument(page_content="new chunk"),
        ]
        service.text_splitter.split_documents.return_value = chunks

        db_ids = ["existing-id", "new-id"]
        service.embedding_manager._store_chunks_to_db.return_value = db_ids

        # Setup FAISS mock with one existing ID
        mock_faiss = Mock()
        mock_docstore = Mock()
        mock_docstore._dict = {"existing-id": "some_doc"}
        mock_faiss.docstore = mock_docstore
        service.faiss_index = mock_faiss

        mock_rag_index = Mock()
        mock_rag_index.index_path = "/tmp/test.faiss"
        mock_rag_index.id = "rag-1"
        service.rag_index_record = mock_rag_index

        result = service.index_local_file(str(test_file))

        assert result["status"] == "success"
        assert result["chunk_count"] == 1
        assert result["embedding_ids"] == ["new-id"]
        # Verify only the new chunk was added
        add_call = mock_faiss.add_documents.call_args
        assert add_call[1]["ids"] == ["new-id"]
