"""
Comprehensive tests for local_deep_research/news/core/storage.py

Tests cover:
- BaseStorage abstract interface and generate_id()
- CardStorage abstract interface
- RatingStorage abstract interface
- PreferenceStorage abstract interface
- Concrete subclass instantiation and method dispatch
- Edge cases: empty data, missing fields, duplicate IDs
"""

import uuid
from typing import Any, Dict, List, Optional

import pytest

from local_deep_research.news.core.storage import (
    BaseStorage,
    CardStorage,
    PreferenceStorage,
    RatingStorage,
)


# ---------------------------------------------------------------------------
# Helpers: minimal concrete implementations for testing
# ---------------------------------------------------------------------------


class ConcreteBaseStorage(BaseStorage):
    """Minimal concrete implementation of BaseStorage for testing."""

    def __init__(self):
        self._store: Dict[str, Dict[str, Any]] = {}

    def create(self, data: Dict[str, Any]) -> str:
        rid = self.generate_id()
        self._store[rid] = data
        return rid

    def get(self, id: str) -> Optional[Dict[str, Any]]:
        return self._store.get(id)

    def update(self, id: str, data: Dict[str, Any]) -> bool:
        if id not in self._store:
            return False
        self._store[id].update(data)
        return True

    def delete(self, id: str) -> bool:
        if id in self._store:
            del self._store[id]
            return True
        return False

    def list(
        self,
        filters: Optional[Dict[str, Any]] = None,
        limit: int = 100,
        offset: int = 0,
    ) -> List[Dict[str, Any]]:
        items = list(self._store.values())
        if filters:
            for key, val in filters.items():
                items = [i for i in items if i.get(key) == val]
        return items[offset : offset + limit]


class ConcreteCardStorage(CardStorage):
    """Minimal concrete implementation of CardStorage."""

    def __init__(self):
        self._store: Dict[str, Dict[str, Any]] = {}
        self._versions: Dict[str, List[Dict[str, Any]]] = {}

    def create(self, data: Dict[str, Any]) -> str:
        rid = self.generate_id()
        self._store[rid] = {**data, "archived": False, "pinned": False}
        self._versions[rid] = []
        return rid

    def get(self, id: str) -> Optional[Dict[str, Any]]:
        return self._store.get(id)

    def update(self, id: str, data: Dict[str, Any]) -> bool:
        if id not in self._store:
            return False
        self._store[id].update(data)
        return True

    def delete(self, id: str) -> bool:
        if id in self._store:
            del self._store[id]
            self._versions.pop(id, None)
            return True
        return False

    def list(
        self,
        filters: Optional[Dict[str, Any]] = None,
        limit: int = 100,
        offset: int = 0,
    ) -> List[Dict[str, Any]]:
        items = list(self._store.values())
        return items[offset : offset + limit]

    def get_by_user(
        self, user_id: str, limit: int = 50, offset: int = 0
    ) -> List[Dict[str, Any]]:
        return [v for v in self._store.values() if v.get("user_id") == user_id][
            offset : offset + limit
        ]

    def get_latest_version(self, card_id: str) -> Optional[Dict[str, Any]]:
        versions = self._versions.get(card_id, [])
        return versions[-1] if versions else None

    def add_version(self, card_id: str, version_data: Dict[str, Any]) -> str:
        if card_id not in self._store:
            return ""
        vid = self.generate_id()
        version_data["version_id"] = vid
        self._versions.setdefault(card_id, []).append(version_data)
        return vid

    def update_latest_info(
        self, card_id: str, version_data: Dict[str, Any]
    ) -> bool:
        if card_id not in self._store:
            return False
        self._store[card_id]["latest_version"] = version_data
        return True

    def archive_card(self, card_id: str) -> bool:
        if card_id not in self._store:
            return False
        self._store[card_id]["archived"] = True
        return True

    def pin_card(self, card_id: str, pinned: bool = True) -> bool:
        if card_id not in self._store:
            return False
        self._store[card_id]["pinned"] = pinned
        return True


class ConcreteRatingStorage(RatingStorage):
    """Minimal concrete implementation of RatingStorage."""

    def __init__(self):
        self._store: Dict[str, Dict[str, Any]] = {}

    def create(self, data: Dict[str, Any]) -> str:
        rid = self.generate_id()
        self._store[rid] = data
        return rid

    def get(self, id: str) -> Optional[Dict[str, Any]]:
        return self._store.get(id)

    def update(self, id: str, data: Dict[str, Any]) -> bool:
        if id not in self._store:
            return False
        self._store[id].update(data)
        return True

    def delete(self, id: str) -> bool:
        if id in self._store:
            del self._store[id]
            return True
        return False

    def list(
        self,
        filters: Optional[Dict[str, Any]] = None,
        limit: int = 100,
        offset: int = 0,
    ) -> List[Dict[str, Any]]:
        return list(self._store.values())[offset : offset + limit]

    def get_user_rating(
        self, user_id: str, item_id: str, rating_type: str
    ) -> Optional[Dict[str, Any]]:
        for v in self._store.values():
            if (
                v.get("user_id") == user_id
                and v.get("item_id") == item_id
                and v.get("rating_type") == rating_type
            ):
                return v
        return None

    def upsert_rating(
        self,
        user_id: str,
        item_id: str,
        rating_type: str,
        rating_value: str,
        item_type: str = "card",
    ) -> str:
        for rid, v in self._store.items():
            if (
                v.get("user_id") == user_id
                and v.get("item_id") == item_id
                and v.get("rating_type") == rating_type
            ):
                v["rating_value"] = rating_value
                return rid
        return self.create(
            {
                "user_id": user_id,
                "item_id": item_id,
                "rating_type": rating_type,
                "rating_value": rating_value,
                "item_type": item_type,
            }
        )

    def get_ratings_summary(
        self, item_id: str, item_type: str = "card"
    ) -> Dict[str, Any]:
        ratings = [
            v
            for v in self._store.values()
            if v.get("item_id") == item_id and v.get("item_type") == item_type
        ]
        return {"item_id": item_id, "count": len(ratings), "ratings": ratings}

    def get_user_ratings(
        self, user_id: str, rating_type: Optional[str] = None, limit: int = 100
    ) -> List[Dict[str, Any]]:
        result = [
            v for v in self._store.values() if v.get("user_id") == user_id
        ]
        if rating_type:
            result = [r for r in result if r.get("rating_type") == rating_type]
        return result[:limit]


class ConcretePreferenceStorage(PreferenceStorage):
    """Minimal concrete implementation of PreferenceStorage."""

    def __init__(self):
        self._store: Dict[str, Dict[str, Any]] = {}
        self._user_prefs: Dict[str, Dict[str, Any]] = {}

    def create(self, data: Dict[str, Any]) -> str:
        rid = self.generate_id()
        self._store[rid] = data
        return rid

    def get(self, id: str) -> Optional[Dict[str, Any]]:
        return self._store.get(id)

    def update(self, id: str, data: Dict[str, Any]) -> bool:
        if id not in self._store:
            return False
        self._store[id].update(data)
        return True

    def delete(self, id: str) -> bool:
        if id in self._store:
            del self._store[id]
            return True
        return False

    def list(
        self,
        filters: Optional[Dict[str, Any]] = None,
        limit: int = 100,
        offset: int = 0,
    ) -> List[Dict[str, Any]]:
        return list(self._store.values())[offset : offset + limit]

    def get_user_preferences(self, user_id: str) -> Optional[Dict[str, Any]]:
        return self._user_prefs.get(user_id)

    def upsert_preferences(
        self, user_id: str, preferences: Dict[str, Any]
    ) -> str:
        if user_id in self._user_prefs:
            self._user_prefs[user_id].update(preferences)
            # Find existing id
            for rid, v in self._store.items():
                if v.get("user_id") == user_id:
                    return rid
            return ""
        rid = self.generate_id()
        self._user_prefs[user_id] = {**preferences, "user_id": user_id}
        self._store[rid] = self._user_prefs[user_id]
        return rid

    def add_liked_item(
        self, user_id: str, item_id: str, item_type: str = "news"
    ) -> bool:
        prefs = self._user_prefs.setdefault(
            user_id, {"liked": [], "disliked": []}
        )
        prefs.setdefault("liked", []).append(
            {"item_id": item_id, "item_type": item_type}
        )
        return True

    def add_disliked_item(
        self, user_id: str, item_id: str, item_type: str = "news"
    ) -> bool:
        prefs = self._user_prefs.setdefault(
            user_id, {"liked": [], "disliked": []}
        )
        prefs.setdefault("disliked", []).append(
            {"item_id": item_id, "item_type": item_type}
        )
        return True

    def update_preference_embedding(
        self, user_id: str, embedding: List[float]
    ) -> bool:
        if user_id not in self._user_prefs:
            return False
        self._user_prefs[user_id]["embedding"] = embedding
        return True


# ---------------------------------------------------------------------------
# Test: cannot instantiate abstract classes directly
# ---------------------------------------------------------------------------


class TestAbstractInstantiation:
    """Verify that abstract classes cannot be instantiated directly."""

    def test_base_storage_cannot_be_instantiated(self):
        with pytest.raises(TypeError):
            BaseStorage()

    def test_card_storage_cannot_be_instantiated(self):
        with pytest.raises(TypeError):
            CardStorage()

    def test_rating_storage_cannot_be_instantiated(self):
        with pytest.raises(TypeError):
            RatingStorage()

    def test_preference_storage_cannot_be_instantiated(self):
        with pytest.raises(TypeError):
            PreferenceStorage()


class TestPartialAbstractImplementation:
    """Verify that partial implementations still raise TypeError."""

    def test_base_storage_missing_one_method(self):
        """Omitting 'list' should prevent instantiation."""

        class Incomplete(BaseStorage):
            def create(self, data):
                pass

            def get(self, id):
                pass

            def update(self, id, data):
                pass

            def delete(self, id):
                pass

            # list intentionally missing

        with pytest.raises(TypeError):
            Incomplete()

    def test_card_storage_missing_card_method(self):
        """CardStorage requires all BaseStorage + card-specific methods."""

        class IncompleteCard(CardStorage):
            def create(self, data):
                pass

            def get(self, id):
                pass

            def update(self, id, data):
                pass

            def delete(self, id):
                pass

            def list(self, filters=None, limit=100, offset=0):
                pass

            # Missing get_by_user, get_latest_version, add_version, etc.

        with pytest.raises(TypeError):
            IncompleteCard()


# ---------------------------------------------------------------------------
# Test: generate_id (the only concrete method on BaseStorage)
# ---------------------------------------------------------------------------


class TestGenerateId:
    """Test BaseStorage.generate_id via concrete subclass."""

    def test_generate_id_returns_string(self):
        storage = ConcreteBaseStorage()
        generated = storage.generate_id()
        assert isinstance(generated, str)

    def test_generate_id_is_valid_uuid4(self):
        storage = ConcreteBaseStorage()
        generated = storage.generate_id()
        parsed = uuid.UUID(generated, version=4)
        assert str(parsed) == generated

    def test_generate_id_uniqueness(self):
        storage = ConcreteBaseStorage()
        ids = {storage.generate_id() for _ in range(200)}
        assert len(ids) == 200

    def test_generate_id_available_on_all_subclasses(self):
        """Every storage subclass inherits generate_id."""
        for cls in [
            ConcreteCardStorage,
            ConcreteRatingStorage,
            ConcretePreferenceStorage,
        ]:
            instance = cls()
            gid = instance.generate_id()
            assert isinstance(gid, str)
            uuid.UUID(gid, version=4)  # validates format


# ---------------------------------------------------------------------------
# Test: BaseStorage CRUD via ConcreteBaseStorage
# ---------------------------------------------------------------------------


class TestBaseStorageCRUD:
    @pytest.fixture
    def storage(self):
        return ConcreteBaseStorage()

    def test_create_and_get(self, storage):
        rid = storage.create({"name": "test"})
        assert isinstance(rid, str)
        record = storage.get(rid)
        assert record == {"name": "test"}

    def test_get_nonexistent(self, storage):
        assert storage.get("nonexistent-id") is None

    def test_update_existing(self, storage):
        rid = storage.create({"name": "old"})
        assert storage.update(rid, {"name": "new"}) is True
        assert storage.get(rid)["name"] == "new"

    def test_update_nonexistent(self, storage):
        assert storage.update("nonexistent", {"x": 1}) is False

    def test_delete_existing(self, storage):
        rid = storage.create({"a": 1})
        assert storage.delete(rid) is True
        assert storage.get(rid) is None

    def test_delete_nonexistent(self, storage):
        assert storage.delete("nonexistent") is False

    def test_list_empty(self, storage):
        assert storage.list() == []

    def test_list_with_records(self, storage):
        storage.create({"x": 1})
        storage.create({"x": 2})
        assert len(storage.list()) == 2

    def test_list_with_filters(self, storage):
        storage.create({"color": "red"})
        storage.create({"color": "blue"})
        assert len(storage.list(filters={"color": "red"})) == 1

    def test_list_limit_and_offset(self, storage):
        for i in range(10):
            storage.create({"idx": i})
        result = storage.list(limit=3, offset=2)
        assert len(result) == 3

    def test_create_empty_data(self, storage):
        rid = storage.create({})
        assert storage.get(rid) == {}

    def test_update_with_empty_data(self, storage):
        rid = storage.create({"a": 1})
        assert storage.update(rid, {}) is True
        assert storage.get(rid) == {"a": 1}

    def test_delete_twice(self, storage):
        rid = storage.create({"a": 1})
        assert storage.delete(rid) is True
        assert storage.delete(rid) is False


# ---------------------------------------------------------------------------
# Test: CardStorage
# ---------------------------------------------------------------------------


class TestCardStorage:
    @pytest.fixture
    def storage(self):
        return ConcreteCardStorage()

    def test_create_card(self, storage):
        cid = storage.create({"user_id": "u1", "title": "Card 1"})
        card = storage.get(cid)
        assert card["user_id"] == "u1"
        assert card["archived"] is False
        assert card["pinned"] is False

    def test_get_by_user(self, storage):
        storage.create({"user_id": "u1", "title": "C1"})
        storage.create({"user_id": "u2", "title": "C2"})
        storage.create({"user_id": "u1", "title": "C3"})
        result = storage.get_by_user("u1")
        assert len(result) == 2

    def test_get_by_user_empty(self, storage):
        assert storage.get_by_user("nobody") == []

    def test_get_by_user_limit_offset(self, storage):
        for i in range(5):
            storage.create({"user_id": "u1", "title": f"C{i}"})
        result = storage.get_by_user("u1", limit=2, offset=1)
        assert len(result) == 2

    def test_get_latest_version_no_versions(self, storage):
        cid = storage.create({"title": "empty"})
        assert storage.get_latest_version(cid) is None

    def test_add_and_get_latest_version(self, storage):
        cid = storage.create({"title": "card"})
        vid1 = storage.add_version(cid, {"content": "v1"})
        vid2 = storage.add_version(cid, {"content": "v2"})
        latest = storage.get_latest_version(cid)
        assert latest["content"] == "v2"
        assert vid1 != vid2

    def test_add_version_nonexistent_card(self, storage):
        result = storage.add_version("nonexistent", {"content": "x"})
        assert result == ""

    def test_update_latest_info(self, storage):
        cid = storage.create({"title": "card"})
        assert storage.update_latest_info(cid, {"summary": "s"}) is True
        card = storage.get(cid)
        assert card["latest_version"] == {"summary": "s"}

    def test_update_latest_info_nonexistent(self, storage):
        assert storage.update_latest_info("no-card", {}) is False

    def test_archive_card(self, storage):
        cid = storage.create({"title": "card"})
        assert storage.archive_card(cid) is True
        assert storage.get(cid)["archived"] is True

    def test_archive_nonexistent_card(self, storage):
        assert storage.archive_card("missing") is False

    def test_pin_card(self, storage):
        cid = storage.create({"title": "card"})
        assert storage.pin_card(cid) is True
        assert storage.get(cid)["pinned"] is True

    def test_unpin_card(self, storage):
        cid = storage.create({"title": "card"})
        storage.pin_card(cid, pinned=True)
        storage.pin_card(cid, pinned=False)
        assert storage.get(cid)["pinned"] is False

    def test_pin_nonexistent_card(self, storage):
        assert storage.pin_card("missing") is False

    def test_delete_card_removes_versions(self, storage):
        cid = storage.create({"title": "card"})
        storage.add_version(cid, {"v": 1})
        storage.delete(cid)
        assert storage.get(cid) is None
        assert storage.get_latest_version(cid) is None


# ---------------------------------------------------------------------------
# Test: RatingStorage
# ---------------------------------------------------------------------------


class TestRatingStorage:
    @pytest.fixture
    def storage(self):
        return ConcreteRatingStorage()

    def test_upsert_creates_rating(self, storage):
        rid = storage.upsert_rating("u1", "item1", "quality", "good")
        assert isinstance(rid, str)
        rating = storage.get_user_rating("u1", "item1", "quality")
        assert rating["rating_value"] == "good"

    def test_upsert_updates_existing(self, storage):
        rid1 = storage.upsert_rating("u1", "item1", "quality", "good")
        rid2 = storage.upsert_rating("u1", "item1", "quality", "excellent")
        assert rid1 == rid2
        rating = storage.get_user_rating("u1", "item1", "quality")
        assert rating["rating_value"] == "excellent"

    def test_get_user_rating_not_found(self, storage):
        assert storage.get_user_rating("u1", "item99", "quality") is None

    def test_get_ratings_summary_empty(self, storage):
        summary = storage.get_ratings_summary("item99")
        assert summary["count"] == 0
        assert summary["ratings"] == []

    def test_get_ratings_summary_with_data(self, storage):
        storage.upsert_rating("u1", "item1", "quality", "good")
        storage.upsert_rating("u2", "item1", "quality", "bad")
        summary = storage.get_ratings_summary("item1")
        assert summary["count"] == 2

    def test_get_user_ratings(self, storage):
        storage.upsert_rating("u1", "item1", "quality", "good")
        storage.upsert_rating("u1", "item2", "relevance", "high")
        storage.upsert_rating("u2", "item1", "quality", "bad")
        result = storage.get_user_ratings("u1")
        assert len(result) == 2

    def test_get_user_ratings_filtered_by_type(self, storage):
        storage.upsert_rating("u1", "item1", "quality", "good")
        storage.upsert_rating("u1", "item2", "relevance", "high")
        result = storage.get_user_ratings("u1", rating_type="quality")
        assert len(result) == 1

    def test_get_user_ratings_empty(self, storage):
        assert storage.get_user_ratings("nobody") == []

    def test_upsert_with_custom_item_type(self, storage):
        storage.upsert_rating(
            "u1", "item1", "quality", "good", item_type="article"
        )
        rating = storage.get_user_rating("u1", "item1", "quality")
        assert rating["item_type"] == "article"

    def test_get_ratings_summary_filters_by_item_type(self, storage):
        storage.upsert_rating("u1", "i1", "q", "good", item_type="card")
        storage.upsert_rating("u2", "i1", "q", "bad", item_type="article")
        summary = storage.get_ratings_summary("i1", item_type="card")
        assert summary["count"] == 1


# ---------------------------------------------------------------------------
# Test: PreferenceStorage
# ---------------------------------------------------------------------------


class TestPreferenceStorage:
    @pytest.fixture
    def storage(self):
        return ConcretePreferenceStorage()

    def test_get_user_preferences_none(self, storage):
        assert storage.get_user_preferences("u1") is None

    def test_upsert_creates_preferences(self, storage):
        rid = storage.upsert_preferences("u1", {"theme": "dark"})
        assert isinstance(rid, str)
        prefs = storage.get_user_preferences("u1")
        assert prefs["theme"] == "dark"

    def test_upsert_updates_preferences(self, storage):
        storage.upsert_preferences("u1", {"theme": "dark"})
        storage.upsert_preferences("u1", {"theme": "light"})
        prefs = storage.get_user_preferences("u1")
        assert prefs["theme"] == "light"

    def test_add_liked_item(self, storage):
        assert storage.add_liked_item("u1", "item1") is True
        prefs = storage.get_user_preferences("u1")
        assert any(
            item["item_id"] == "item1" for item in prefs.get("liked", [])
        )

    def test_add_disliked_item(self, storage):
        assert storage.add_disliked_item("u1", "item1") is True
        prefs = storage.get_user_preferences("u1")
        assert any(
            item["item_id"] == "item1" for item in prefs.get("disliked", [])
        )

    def test_add_liked_item_custom_type(self, storage):
        storage.add_liked_item("u1", "item1", item_type="article")
        prefs = storage.get_user_preferences("u1")
        liked = prefs["liked"]
        assert liked[0]["item_type"] == "article"

    def test_update_preference_embedding(self, storage):
        storage.upsert_preferences("u1", {"theme": "dark"})
        emb = [0.1, 0.2, 0.3]
        assert storage.update_preference_embedding("u1", emb) is True
        prefs = storage.get_user_preferences("u1")
        assert prefs["embedding"] == emb

    def test_update_preference_embedding_no_user(self, storage):
        assert storage.update_preference_embedding("nobody", [0.1]) is False

    def test_update_preference_embedding_empty(self, storage):
        storage.upsert_preferences("u1", {})
        assert storage.update_preference_embedding("u1", []) is True
        assert storage.get_user_preferences("u1")["embedding"] == []


# ---------------------------------------------------------------------------
# Test: Inheritance hierarchy
# ---------------------------------------------------------------------------


class TestInheritanceHierarchy:
    def test_card_storage_is_base_storage(self):
        assert issubclass(CardStorage, BaseStorage)

    def test_rating_storage_is_base_storage(self):
        assert issubclass(RatingStorage, BaseStorage)

    def test_preference_storage_is_base_storage(self):
        assert issubclass(PreferenceStorage, BaseStorage)

    def test_concrete_card_isinstance(self):
        s = ConcreteCardStorage()
        assert isinstance(s, BaseStorage)
        assert isinstance(s, CardStorage)


# ---------------------------------------------------------------------------
# Test: Abstract method signatures
# ---------------------------------------------------------------------------


class TestAbstractMethodSignatures:
    """Ensure the abstract classes define the expected methods."""

    def test_base_storage_abstract_methods(self):
        expected = {"create", "get", "update", "delete", "list"}
        actual = set(BaseStorage.__abstractmethods__)
        assert expected == actual

    def test_card_storage_abstract_methods(self):
        expected = {
            "create",
            "get",
            "update",
            "delete",
            "list",
            "get_by_user",
            "get_latest_version",
            "add_version",
            "update_latest_info",
            "archive_card",
            "pin_card",
        }
        actual = set(CardStorage.__abstractmethods__)
        assert expected == actual

    def test_rating_storage_abstract_methods(self):
        expected = {
            "create",
            "get",
            "update",
            "delete",
            "list",
            "get_user_rating",
            "upsert_rating",
            "get_ratings_summary",
            "get_user_ratings",
        }
        actual = set(RatingStorage.__abstractmethods__)
        assert expected == actual

    def test_preference_storage_abstract_methods(self):
        expected = {
            "create",
            "get",
            "update",
            "delete",
            "list",
            "get_user_preferences",
            "upsert_preferences",
            "add_liked_item",
            "add_disliked_item",
            "update_preference_embedding",
        }
        actual = set(PreferenceStorage.__abstractmethods__)
        assert expected == actual


# ---------------------------------------------------------------------------
# Test: Default parameters
# ---------------------------------------------------------------------------


class TestDefaultParameters:
    """Ensure default parameter values work correctly through implementations."""

    def test_list_defaults(self):
        storage = ConcreteBaseStorage()
        for i in range(150):
            storage.create({"idx": i})
        # default limit=100, offset=0
        result = storage.list()
        assert len(result) == 100

    def test_get_by_user_defaults(self):
        storage = ConcreteCardStorage()
        for i in range(60):
            storage.create({"user_id": "u1", "title": f"C{i}"})
        # default limit=50, offset=0
        result = storage.get_by_user("u1")
        assert len(result) == 50

    def test_pin_card_default_pinned_true(self):
        storage = ConcreteCardStorage()
        cid = storage.create({"title": "card"})
        storage.pin_card(cid)  # default pinned=True
        assert storage.get(cid)["pinned"] is True

    def test_upsert_rating_default_item_type(self):
        storage = ConcreteRatingStorage()
        storage.upsert_rating("u1", "i1", "q", "good")
        rating = storage.get_user_rating("u1", "i1", "q")
        assert rating["item_type"] == "card"

    def test_get_ratings_summary_default_item_type(self):
        storage = ConcreteRatingStorage()
        storage.upsert_rating("u1", "i1", "q", "good", item_type="card")
        summary = storage.get_ratings_summary("i1")
        assert summary["count"] == 1

    def test_add_liked_item_default_type(self):
        storage = ConcretePreferenceStorage()
        storage.add_liked_item("u1", "item1")
        prefs = storage.get_user_preferences("u1")
        assert prefs["liked"][0]["item_type"] == "news"

    def test_add_disliked_item_default_type(self):
        storage = ConcretePreferenceStorage()
        storage.add_disliked_item("u1", "item1")
        prefs = storage.get_user_preferences("u1")
        assert prefs["disliked"][0]["item_type"] == "news"
