from unittest.mock import create_autospec, patch

import pytest
from faker import Faker

from core.rag.index_processor.constant.built_in_field import BuiltInField
from models import Account, Tenant, TenantAccountJoin, TenantAccountRole
from models.dataset import Dataset, DatasetMetadata, DatasetMetadataBinding, Document
from services.entities.knowledge_entities.knowledge_entities import MetadataArgs
from services.metadata_service import MetadataService


class TestMetadataService:
    """Integration tests for MetadataService using testcontainers."""

    @pytest.fixture
    def mock_external_service_dependencies(self):
        """Mock setup for external service dependencies."""
        with (
            patch("libs.login.current_user", create_autospec(Account, instance=True)) as mock_current_user,
            patch("services.metadata_service.redis_client") as mock_redis_client,
            patch("services.dataset_service.DocumentService") as mock_document_service,
        ):
            # Setup default mock returns
            mock_redis_client.get.return_value = None
            mock_redis_client.set.return_value = True
            mock_redis_client.delete.return_value = 1

            yield {
                "current_user": mock_current_user,
                "redis_client": mock_redis_client,
                "document_service": mock_document_service,
            }

    def _create_test_account_and_tenant(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Helper method to create a test account and tenant for testing.

        Args:
            db_session_with_containers: Database session from testcontainers infrastructure
            mock_external_service_dependencies: Mock dependencies

        Returns:
            tuple: (account, tenant) - Created account and tenant instances
        """
        fake = Faker()

        # Create account
        account = Account(
            email=fake.email(),
            name=fake.name(),
            interface_language="en-US",
            status="active",
        )

        from extensions.ext_database import db

        db.session.add(account)
        db.session.commit()

        # Create tenant for the account
        tenant = Tenant(
            name=fake.company(),
            status="normal",
        )
        db.session.add(tenant)
        db.session.commit()

        # Create tenant-account join
        join = TenantAccountJoin(
            tenant_id=tenant.id,
            account_id=account.id,
            role=TenantAccountRole.OWNER,
            current=True,
        )
        db.session.add(join)
        db.session.commit()

        # Set current tenant for account
        account.current_tenant = tenant

        return account, tenant

    def _create_test_dataset(self, db_session_with_containers, mock_external_service_dependencies, account, tenant):
        """
        Helper method to create a test dataset for testing.

        Args:
            db_session_with_containers: Database session from testcontainers infrastructure
            mock_external_service_dependencies: Mock dependencies
            account: Account instance
            tenant: Tenant instance

        Returns:
            Dataset: Created dataset instance
        """
        fake = Faker()

        dataset = Dataset(
            tenant_id=tenant.id,
            name=fake.company(),
            description=fake.text(max_nb_chars=100),
            data_source_type="upload_file",
            created_by=account.id,
            built_in_field_enabled=False,
        )

        from extensions.ext_database import db

        db.session.add(dataset)
        db.session.commit()

        return dataset

    def _create_test_document(self, db_session_with_containers, mock_external_service_dependencies, dataset, account):
        """
        Helper method to create a test document for testing.

        Args:
            db_session_with_containers: Database session from testcontainers infrastructure
            mock_external_service_dependencies: Mock dependencies
            dataset: Dataset instance
            account: Account instance

        Returns:
            Document: Created document instance
        """
        fake = Faker()

        document = Document(
            tenant_id=dataset.tenant_id,
            dataset_id=dataset.id,
            position=1,
            data_source_type="upload_file",
            data_source_info="{}",
            batch="test-batch",
            name=fake.file_name(),
            created_from="web",
            created_by=account.id,
            doc_form="text",
            doc_language="en",
        )

        from extensions.ext_database import db

        db.session.add(document)
        db.session.commit()

        return document

    def test_create_metadata_success(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test successful metadata creation with valid parameters.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        metadata_args = MetadataArgs(type="string", name="test_metadata")

        # Act: Execute the method under test
        result = MetadataService.create_metadata(dataset.id, metadata_args)

        # Assert: Verify the expected outcomes
        assert result is not None
        assert result.name == "test_metadata"
        assert result.type == "string"
        assert result.dataset_id == dataset.id
        assert result.tenant_id == tenant.id
        assert result.created_by == account.id

        # Verify database state
        from extensions.ext_database import db

        db.session.refresh(result)
        assert result.id is not None
        assert result.created_at is not None

    def test_create_metadata_name_too_long(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test metadata creation fails when name exceeds 255 characters.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        long_name = "a" * 256  # 256 characters, exceeding 255 limit
        metadata_args = MetadataArgs(type="string", name=long_name)

        # Act & Assert: Verify proper error handling
        with pytest.raises(ValueError, match="Metadata name cannot exceed 255 characters."):
            MetadataService.create_metadata(dataset.id, metadata_args)

    def test_create_metadata_name_already_exists(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test metadata creation fails when name already exists in the same dataset.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Create first metadata
        first_metadata_args = MetadataArgs(type="string", name="duplicate_name")
        MetadataService.create_metadata(dataset.id, first_metadata_args)

        # Try to create second metadata with same name
        second_metadata_args = MetadataArgs(type="number", name="duplicate_name")

        # Act & Assert: Verify proper error handling
        with pytest.raises(ValueError, match="Metadata name already exists."):
            MetadataService.create_metadata(dataset.id, second_metadata_args)

    def test_create_metadata_name_conflicts_with_built_in_field(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test metadata creation fails when name conflicts with built-in field names.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Try to create metadata with built-in field name
        built_in_field_name = BuiltInField.document_name
        metadata_args = MetadataArgs(type="string", name=built_in_field_name)

        # Act & Assert: Verify proper error handling
        with pytest.raises(ValueError, match="Metadata name already exists in Built-in fields."):
            MetadataService.create_metadata(dataset.id, metadata_args)

    def test_update_metadata_name_success(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test successful metadata name update with valid parameters.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Create metadata first
        metadata_args = MetadataArgs(type="string", name="old_name")
        metadata = MetadataService.create_metadata(dataset.id, metadata_args)

        # Act: Execute the method under test
        new_name = "new_name"
        result = MetadataService.update_metadata_name(dataset.id, metadata.id, new_name)

        # Assert: Verify the expected outcomes
        assert result is not None
        assert result.name == new_name
        assert result.updated_by == account.id
        assert result.updated_at is not None

        # Verify database state
        from extensions.ext_database import db

        db.session.refresh(result)
        assert result.name == new_name

    def test_update_metadata_name_too_long(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test metadata name update fails when new name exceeds 255 characters.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Create metadata first
        metadata_args = MetadataArgs(type="string", name="old_name")
        metadata = MetadataService.create_metadata(dataset.id, metadata_args)

        # Try to update with too long name
        long_name = "a" * 256  # 256 characters, exceeding 255 limit

        # Act & Assert: Verify proper error handling
        with pytest.raises(ValueError, match="Metadata name cannot exceed 255 characters."):
            MetadataService.update_metadata_name(dataset.id, metadata.id, long_name)

    def test_update_metadata_name_already_exists(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test metadata name update fails when new name already exists in the same dataset.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Create two metadata entries
        first_metadata_args = MetadataArgs(type="string", name="first_metadata")
        first_metadata = MetadataService.create_metadata(dataset.id, first_metadata_args)

        second_metadata_args = MetadataArgs(type="number", name="second_metadata")
        second_metadata = MetadataService.create_metadata(dataset.id, second_metadata_args)

        # Try to update first metadata with second metadata's name
        with pytest.raises(ValueError, match="Metadata name already exists."):
            MetadataService.update_metadata_name(dataset.id, first_metadata.id, "second_metadata")

    def test_update_metadata_name_conflicts_with_built_in_field(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test metadata name update fails when new name conflicts with built-in field names.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Create metadata first
        metadata_args = MetadataArgs(type="string", name="old_name")
        metadata = MetadataService.create_metadata(dataset.id, metadata_args)

        # Try to update with built-in field name
        built_in_field_name = BuiltInField.document_name

        with pytest.raises(ValueError, match="Metadata name already exists in Built-in fields."):
            MetadataService.update_metadata_name(dataset.id, metadata.id, built_in_field_name)

    def test_update_metadata_name_not_found(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test metadata name update fails when metadata ID does not exist.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Try to update non-existent metadata
        import uuid

        fake_metadata_id = str(uuid.uuid4())  # Use valid UUID format
        new_name = "new_name"

        # Act: Execute the method under test
        result = MetadataService.update_metadata_name(dataset.id, fake_metadata_id, new_name)

        # Assert: Verify the method returns None when metadata is not found
        assert result is None

    def test_delete_metadata_success(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test successful metadata deletion with valid parameters.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Create metadata first
        metadata_args = MetadataArgs(type="string", name="to_be_deleted")
        metadata = MetadataService.create_metadata(dataset.id, metadata_args)

        # Act: Execute the method under test
        result = MetadataService.delete_metadata(dataset.id, metadata.id)

        # Assert: Verify the expected outcomes
        assert result is not None
        assert result.id == metadata.id

        # Verify metadata was deleted from database
        from extensions.ext_database import db

        deleted_metadata = db.session.query(DatasetMetadata).filter_by(id=metadata.id).first()
        assert deleted_metadata is None

    def test_delete_metadata_not_found(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test metadata deletion fails when metadata ID does not exist.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Try to delete non-existent metadata
        import uuid

        fake_metadata_id = str(uuid.uuid4())  # Use valid UUID format

        # Act: Execute the method under test
        result = MetadataService.delete_metadata(dataset.id, fake_metadata_id)

        # Assert: Verify the method returns None when metadata is not found
        assert result is None

    def test_delete_metadata_with_document_bindings(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test metadata deletion successfully removes document metadata bindings.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )
        document = self._create_test_document(
            db_session_with_containers, mock_external_service_dependencies, dataset, account
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Create metadata
        metadata_args = MetadataArgs(type="string", name="test_metadata")
        metadata = MetadataService.create_metadata(dataset.id, metadata_args)

        # Create metadata binding
        binding = DatasetMetadataBinding(
            tenant_id=tenant.id,
            dataset_id=dataset.id,
            metadata_id=metadata.id,
            document_id=document.id,
            created_by=account.id,
        )

        from extensions.ext_database import db

        db.session.add(binding)
        db.session.commit()

        # Set document metadata
        document.doc_metadata = {"test_metadata": "test_value"}
        db.session.add(document)
        db.session.commit()

        # Act: Execute the method under test
        result = MetadataService.delete_metadata(dataset.id, metadata.id)

        # Assert: Verify the expected outcomes
        assert result is not None

        # Verify metadata was deleted from database
        deleted_metadata = db.session.query(DatasetMetadata).filter_by(id=metadata.id).first()
        assert deleted_metadata is None

        # Note: The service attempts to update document metadata but may not succeed
        # due to mock configuration. The main functionality (metadata deletion) is verified.

    def test_get_built_in_fields_success(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test successful retrieval of built-in metadata fields.
        """
        # Act: Execute the method under test
        result = MetadataService.get_built_in_fields()

        # Assert: Verify the expected outcomes
        assert result is not None
        assert len(result) == 5

        # Verify all expected built-in fields are present
        field_names = [field["name"] for field in result]
        field_types = [field["type"] for field in result]

        assert BuiltInField.document_name in field_names
        assert BuiltInField.uploader in field_names
        assert BuiltInField.upload_date in field_names
        assert BuiltInField.last_update_date in field_names
        assert BuiltInField.source in field_names

        # Verify field types
        assert "string" in field_types
        assert "time" in field_types

    def test_enable_built_in_field_success(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test successful enabling of built-in fields for a dataset.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )
        document = self._create_test_document(
            db_session_with_containers, mock_external_service_dependencies, dataset, account
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Mock DocumentService.get_working_documents_by_dataset_id
        mock_external_service_dependencies["document_service"].get_working_documents_by_dataset_id.return_value = [
            document
        ]

        # Verify dataset starts with built-in fields disabled
        assert dataset.built_in_field_enabled is False

        # Act: Execute the method under test
        MetadataService.enable_built_in_field(dataset)

        # Assert: Verify the expected outcomes
        from extensions.ext_database import db

        db.session.refresh(dataset)
        assert dataset.built_in_field_enabled is True

        # Note: Document metadata update depends on DocumentService mock working correctly
        # The main functionality (enabling built-in fields) is verified

    def test_enable_built_in_field_already_enabled(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test enabling built-in fields when they are already enabled.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Enable built-in fields first
        dataset.built_in_field_enabled = True
        from extensions.ext_database import db

        db.session.add(dataset)
        db.session.commit()

        # Mock DocumentService.get_working_documents_by_dataset_id
        mock_external_service_dependencies["document_service"].get_working_documents_by_dataset_id.return_value = []

        # Act: Execute the method under test
        MetadataService.enable_built_in_field(dataset)

        # Assert: Verify the method returns early without changes
        db.session.refresh(dataset)
        assert dataset.built_in_field_enabled is True

    def test_enable_built_in_field_with_no_documents(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test enabling built-in fields for a dataset with no documents.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Mock DocumentService.get_working_documents_by_dataset_id to return empty list
        mock_external_service_dependencies["document_service"].get_working_documents_by_dataset_id.return_value = []

        # Act: Execute the method under test
        MetadataService.enable_built_in_field(dataset)

        # Assert: Verify the expected outcomes
        from extensions.ext_database import db

        db.session.refresh(dataset)
        assert dataset.built_in_field_enabled is True

    def test_disable_built_in_field_success(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test successful disabling of built-in fields for a dataset.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )
        document = self._create_test_document(
            db_session_with_containers, mock_external_service_dependencies, dataset, account
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Enable built-in fields first
        dataset.built_in_field_enabled = True
        from extensions.ext_database import db

        db.session.add(dataset)
        db.session.commit()

        # Set document metadata with built-in fields
        document.doc_metadata = {
            BuiltInField.document_name: document.name,
            BuiltInField.uploader: "test_uploader",
            BuiltInField.upload_date: 1234567890.0,
            BuiltInField.last_update_date: 1234567890.0,
            BuiltInField.source: "test_source",
        }
        db.session.add(document)
        db.session.commit()

        # Mock DocumentService.get_working_documents_by_dataset_id
        mock_external_service_dependencies["document_service"].get_working_documents_by_dataset_id.return_value = [
            document
        ]

        # Act: Execute the method under test
        MetadataService.disable_built_in_field(dataset)

        # Assert: Verify the expected outcomes
        db.session.refresh(dataset)
        assert dataset.built_in_field_enabled is False

        # Note: Document metadata update depends on DocumentService mock working correctly
        # The main functionality (disabling built-in fields) is verified

    def test_disable_built_in_field_already_disabled(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test disabling built-in fields when they are already disabled.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Verify dataset starts with built-in fields disabled
        assert dataset.built_in_field_enabled is False

        # Mock DocumentService.get_working_documents_by_dataset_id
        mock_external_service_dependencies["document_service"].get_working_documents_by_dataset_id.return_value = []

        # Act: Execute the method under test
        MetadataService.disable_built_in_field(dataset)

        # Assert: Verify the method returns early without changes
        from extensions.ext_database import db

        db.session.refresh(dataset)
        assert dataset.built_in_field_enabled is False

    def test_disable_built_in_field_with_no_documents(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test disabling built-in fields for a dataset with no documents.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Enable built-in fields first
        dataset.built_in_field_enabled = True
        from extensions.ext_database import db

        db.session.add(dataset)
        db.session.commit()

        # Mock DocumentService.get_working_documents_by_dataset_id to return empty list
        mock_external_service_dependencies["document_service"].get_working_documents_by_dataset_id.return_value = []

        # Act: Execute the method under test
        MetadataService.disable_built_in_field(dataset)

        # Assert: Verify the expected outcomes
        db.session.refresh(dataset)
        assert dataset.built_in_field_enabled is False

    def test_update_documents_metadata_success(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test successful update of documents metadata.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )
        document = self._create_test_document(
            db_session_with_containers, mock_external_service_dependencies, dataset, account
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Create metadata
        metadata_args = MetadataArgs(type="string", name="test_metadata")
        metadata = MetadataService.create_metadata(dataset.id, metadata_args)

        # Mock DocumentService.get_document
        mock_external_service_dependencies["document_service"].get_document.return_value = document

        # Create metadata operation data
        from services.entities.knowledge_entities.knowledge_entities import (
            DocumentMetadataOperation,
            MetadataDetail,
            MetadataOperationData,
        )

        metadata_detail = MetadataDetail(id=metadata.id, name=metadata.name, value="test_value")

        operation = DocumentMetadataOperation(document_id=document.id, metadata_list=[metadata_detail])

        operation_data = MetadataOperationData(operation_data=[operation])

        # Act: Execute the method under test
        MetadataService.update_documents_metadata(dataset, operation_data)

        # Assert: Verify the expected outcomes
        from extensions.ext_database import db

        # Verify document metadata was updated
        db.session.refresh(document)
        assert document.doc_metadata is not None
        assert "test_metadata" in document.doc_metadata
        assert document.doc_metadata["test_metadata"] == "test_value"

        # Verify metadata binding was created
        binding = (
            db.session.query(DatasetMetadataBinding).filter_by(metadata_id=metadata.id, document_id=document.id).first()
        )
        assert binding is not None
        assert binding.tenant_id == tenant.id
        assert binding.dataset_id == dataset.id

    def test_update_documents_metadata_with_built_in_fields_enabled(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test update of documents metadata when built-in fields are enabled.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )
        document = self._create_test_document(
            db_session_with_containers, mock_external_service_dependencies, dataset, account
        )

        # Enable built-in fields
        dataset.built_in_field_enabled = True
        from extensions.ext_database import db

        db.session.add(dataset)
        db.session.commit()

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Create metadata
        metadata_args = MetadataArgs(type="string", name="test_metadata")
        metadata = MetadataService.create_metadata(dataset.id, metadata_args)

        # Mock DocumentService.get_document
        mock_external_service_dependencies["document_service"].get_document.return_value = document

        # Create metadata operation data
        from services.entities.knowledge_entities.knowledge_entities import (
            DocumentMetadataOperation,
            MetadataDetail,
            MetadataOperationData,
        )

        metadata_detail = MetadataDetail(id=metadata.id, name=metadata.name, value="test_value")

        operation = DocumentMetadataOperation(document_id=document.id, metadata_list=[metadata_detail])

        operation_data = MetadataOperationData(operation_data=[operation])

        # Act: Execute the method under test
        MetadataService.update_documents_metadata(dataset, operation_data)

        # Assert: Verify the expected outcomes
        # Verify document metadata was updated with both custom and built-in fields
        db.session.refresh(document)
        assert document.doc_metadata is not None
        assert "test_metadata" in document.doc_metadata
        assert document.doc_metadata["test_metadata"] == "test_value"

        # Note: Built-in fields would be added if DocumentService mock works correctly
        # The main functionality (custom metadata update) is verified

    def test_update_documents_metadata_document_not_found(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test update of documents metadata when document is not found.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Create metadata
        metadata_args = MetadataArgs(type="string", name="test_metadata")
        metadata = MetadataService.create_metadata(dataset.id, metadata_args)

        # Create metadata operation data
        from services.entities.knowledge_entities.knowledge_entities import (
            DocumentMetadataOperation,
            MetadataDetail,
            MetadataOperationData,
        )

        metadata_detail = MetadataDetail(id=metadata.id, name=metadata.name, value="test_value")

        # Use a valid UUID format that does not exist in the database
        operation = DocumentMetadataOperation(
            document_id="00000000-0000-0000-0000-000000000000", metadata_list=[metadata_detail]
        )

        operation_data = MetadataOperationData(operation_data=[operation])

        # Act & Assert: The method should raise ValueError("Document not found.")
        # because the exception is now re-raised after rollback
        with pytest.raises(ValueError, match="Document not found"):
            MetadataService.update_documents_metadata(dataset, operation_data)

    def test_knowledge_base_metadata_lock_check_dataset_id(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test metadata lock check for dataset operations.
        """
        # Arrange: Setup mocks
        mock_external_service_dependencies["redis_client"].get.return_value = None
        mock_external_service_dependencies["redis_client"].set.return_value = True

        dataset_id = "test-dataset-id"

        # Act: Execute the method under test
        MetadataService.knowledge_base_metadata_lock_check(dataset_id, None)

        # Assert: Verify the expected outcomes
        # Verify Redis lock was set
        mock_external_service_dependencies["redis_client"].set.assert_called_once()

        # Verify lock key format
        call_args = mock_external_service_dependencies["redis_client"].set.call_args
        assert call_args[0][0] == f"dataset_metadata_lock_{dataset_id}"

    def test_knowledge_base_metadata_lock_check_document_id(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test metadata lock check for document operations.
        """
        # Arrange: Setup mocks
        mock_external_service_dependencies["redis_client"].get.return_value = None
        mock_external_service_dependencies["redis_client"].set.return_value = True

        document_id = "test-document-id"

        # Act: Execute the method under test
        MetadataService.knowledge_base_metadata_lock_check(None, document_id)

        # Assert: Verify the expected outcomes
        # Verify Redis lock was set
        mock_external_service_dependencies["redis_client"].set.assert_called_once()

        # Verify lock key format
        call_args = mock_external_service_dependencies["redis_client"].set.call_args
        assert call_args[0][0] == f"document_metadata_lock_{document_id}"

    def test_knowledge_base_metadata_lock_check_lock_exists(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test metadata lock check when lock already exists.
        """
        # Arrange: Setup mocks to simulate existing lock
        mock_external_service_dependencies["redis_client"].get.return_value = "1"  # Lock exists

        dataset_id = "test-dataset-id"

        # Act & Assert: Verify proper error handling
        with pytest.raises(
            ValueError, match="Another knowledge base metadata operation is running, please wait a moment."
        ):
            MetadataService.knowledge_base_metadata_lock_check(dataset_id, None)

    def test_knowledge_base_metadata_lock_check_document_lock_exists(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test metadata lock check when document lock already exists.
        """
        # Arrange: Setup mocks to simulate existing lock
        mock_external_service_dependencies["redis_client"].get.return_value = "1"  # Lock exists

        document_id = "test-document-id"

        # Act & Assert: Verify proper error handling
        with pytest.raises(ValueError, match="Another document metadata operation is running, please wait a moment."):
            MetadataService.knowledge_base_metadata_lock_check(None, document_id)

    def test_get_dataset_metadatas_success(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test successful retrieval of dataset metadata information.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Create metadata
        metadata_args = MetadataArgs(type="string", name="test_metadata")
        metadata = MetadataService.create_metadata(dataset.id, metadata_args)

        # Create document and metadata binding
        document = self._create_test_document(
            db_session_with_containers, mock_external_service_dependencies, dataset, account
        )

        binding = DatasetMetadataBinding(
            tenant_id=tenant.id,
            dataset_id=dataset.id,
            metadata_id=metadata.id,
            document_id=document.id,
            created_by=account.id,
        )

        from extensions.ext_database import db

        db.session.add(binding)
        db.session.commit()

        # Act: Execute the method under test
        result = MetadataService.get_dataset_metadatas(dataset)

        # Assert: Verify the expected outcomes
        assert result is not None
        assert "doc_metadata" in result
        assert "built_in_field_enabled" in result

        # Verify metadata information
        doc_metadata = result["doc_metadata"]
        assert len(doc_metadata) == 1
        assert doc_metadata[0]["id"] == metadata.id
        assert doc_metadata[0]["name"] == metadata.name
        assert doc_metadata[0]["type"] == metadata.type
        assert doc_metadata[0]["count"] == 1  # One document bound to this metadata

        # Verify built-in field status
        assert result["built_in_field_enabled"] is False

    def test_get_dataset_metadatas_with_built_in_fields_enabled(
        self, db_session_with_containers, mock_external_service_dependencies
    ):
        """
        Test retrieval of dataset metadata when built-in fields are enabled.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Enable built-in fields
        dataset.built_in_field_enabled = True
        from extensions.ext_database import db

        db.session.add(dataset)
        db.session.commit()

        # Setup mocks
        mock_external_service_dependencies["current_user"].current_tenant_id = tenant.id
        mock_external_service_dependencies["current_user"].id = account.id

        # Create metadata
        metadata_args = MetadataArgs(type="string", name="test_metadata")
        metadata = MetadataService.create_metadata(dataset.id, metadata_args)

        # Act: Execute the method under test
        result = MetadataService.get_dataset_metadatas(dataset)

        # Assert: Verify the expected outcomes
        assert result is not None
        assert "doc_metadata" in result
        assert "built_in_field_enabled" in result

        # Verify metadata information
        doc_metadata = result["doc_metadata"]
        assert len(doc_metadata) == 1  # Only custom metadata, built-in fields are not included in this list

        # Verify built-in field status
        assert result["built_in_field_enabled"] is True

    def test_get_dataset_metadatas_no_metadata(self, db_session_with_containers, mock_external_service_dependencies):
        """
        Test retrieval of dataset metadata when no metadata exists.
        """
        # Arrange: Create test data
        account, tenant = self._create_test_account_and_tenant(
            db_session_with_containers, mock_external_service_dependencies
        )
        dataset = self._create_test_dataset(
            db_session_with_containers, mock_external_service_dependencies, account, tenant
        )

        # Act: Execute the method under test
        result = MetadataService.get_dataset_metadatas(dataset)

        # Assert: Verify the expected outcomes
        assert result is not None
        assert "doc_metadata" in result
        assert "built_in_field_enabled" in result

        # Verify metadata information
        doc_metadata = result["doc_metadata"]
        assert len(doc_metadata) == 0  # No metadata exists

        # Verify built-in field status
        assert result["built_in_field_enabled"] is False
