"""
Deep behavioral tests for storage interface contracts and patterns.
Tests BaseStorage, CardStorage, SubscriptionStorage, RatingStorage,
PreferenceStorage, SearchHistoryStorage, and NewsItemStorage interfaces.
"""

from datetime import datetime, timezone, timedelta
import uuid


# --- UUID generation ---


class TestUUIDGeneration:
    """Tests for storage ID generation."""

    def test_generates_valid_uuid(self):
        new_id = str(uuid.uuid4())
        assert len(new_id) == 36

    def test_uuid_is_unique(self):
        id1 = str(uuid.uuid4())
        id2 = str(uuid.uuid4())
        assert id1 != id2

    def test_uuid_format(self):
        new_id = str(uuid.uuid4())
        parts = new_id.split("-")
        assert len(parts) == 5
        assert len(parts[0]) == 8
        assert len(parts[1]) == 4
        assert len(parts[2]) == 4
        assert len(parts[3]) == 4
        assert len(parts[4]) == 12


# --- BaseStorage CRUD patterns ---


class TestBaseStorageCRUDPatterns:
    """Tests for BaseStorage CRUD operation patterns."""

    def test_create_returns_string_id(self):
        """Create should return a string ID."""
        result = str(uuid.uuid4())
        assert isinstance(result, str)
        assert len(result) > 0

    def test_get_returns_none_for_missing(self):
        """Get should return None for missing records."""
        storage = {}
        result = storage.get("missing-id")
        assert result is None

    def test_get_returns_dict_for_existing(self):
        """Get should return dict for existing records."""
        storage = {"id-1": {"id": "id-1", "name": "test"}}
        result = storage.get("id-1")
        assert isinstance(result, dict)
        assert result["name"] == "test"

    def test_update_returns_bool(self):
        """Update should return success boolean."""
        storage = {"id-1": {"name": "old"}}
        storage["id-1"]["name"] = "new"
        success = True
        assert success is True

    def test_delete_returns_bool(self):
        """Delete should return success boolean."""
        storage = {"id-1": {}}
        del storage["id-1"]
        assert "id-1" not in storage

    def test_list_returns_list(self):
        """List should return a list."""
        storage = {"1": {}, "2": {}}
        result = list(storage.values())
        assert isinstance(result, list)


# --- List with filters pattern ---


class TestListFilterPattern:
    """Tests for list filtering pattern."""

    def _list_with_filters(self, items, filters=None, limit=100, offset=0):
        """Pattern for filtering and pagination."""
        result = items
        if filters:
            for key, value in filters.items():
                result = [i for i in result if i.get(key) == value]
        return result[offset : offset + limit]

    def test_no_filters(self):
        items = [{"id": "1"}, {"id": "2"}, {"id": "3"}]
        result = self._list_with_filters(items)
        assert len(result) == 3

    def test_filter_by_status(self):
        items = [
            {"id": "1", "status": "active"},
            {"id": "2", "status": "paused"},
            {"id": "3", "status": "active"},
        ]
        result = self._list_with_filters(items, {"status": "active"})
        assert len(result) == 2

    def test_filter_with_limit(self):
        items = [{"id": str(i)} for i in range(10)]
        result = self._list_with_filters(items, limit=5)
        assert len(result) == 5

    def test_filter_with_offset(self):
        items = [{"id": str(i)} for i in range(10)]
        result = self._list_with_filters(items, offset=5, limit=3)
        assert result[0]["id"] == "5"
        assert len(result) == 3

    def test_multiple_filters(self):
        items = [
            {"status": "active", "type": "search"},
            {"status": "active", "type": "topic"},
            {"status": "paused", "type": "search"},
        ]
        result = self._list_with_filters(
            items, {"status": "active", "type": "search"}
        )
        assert len(result) == 1


# --- CardStorage patterns ---


class TestCardStorageGetByUserPattern:
    """Tests for card retrieval by user."""

    def _get_by_user(self, cards, user_id, limit=50, offset=0):
        user_cards = [c for c in cards if c.get("user_id") == user_id]
        return user_cards[offset : offset + limit]

    def test_filters_by_user(self):
        cards = [
            {"id": "1", "user_id": "u1"},
            {"id": "2", "user_id": "u2"},
            {"id": "3", "user_id": "u1"},
        ]
        result = self._get_by_user(cards, "u1")
        assert len(result) == 2
        assert all(c["user_id"] == "u1" for c in result)

    def test_respects_limit(self):
        cards = [{"id": str(i), "user_id": "u1"} for i in range(10)]
        result = self._get_by_user(cards, "u1", limit=3)
        assert len(result) == 3

    def test_respects_offset(self):
        cards = [{"id": str(i), "user_id": "u1"} for i in range(10)]
        result = self._get_by_user(cards, "u1", offset=5, limit=2)
        assert result[0]["id"] == "5"

    def test_no_cards_for_user(self):
        cards = [{"id": "1", "user_id": "u1"}]
        result = self._get_by_user(cards, "u2")
        assert result == []


class TestCardVersioningPattern:
    """Tests for card versioning patterns."""

    def _get_latest_version(self, versions, card_id):
        card_versions = [v for v in versions if v.get("card_id") == card_id]
        if not card_versions:
            return None
        return max(card_versions, key=lambda v: v.get("version_number", 0))

    def test_returns_highest_version(self):
        versions = [
            {"card_id": "c1", "version_number": 1, "data": "v1"},
            {"card_id": "c1", "version_number": 2, "data": "v2"},
            {"card_id": "c1", "version_number": 3, "data": "v3"},
        ]
        result = self._get_latest_version(versions, "c1")
        assert result["version_number"] == 3
        assert result["data"] == "v3"

    def test_returns_none_for_missing_card(self):
        versions = [{"card_id": "c1", "version_number": 1}]
        result = self._get_latest_version(versions, "c2")
        assert result is None

    def test_single_version(self):
        versions = [{"card_id": "c1", "version_number": 1}]
        result = self._get_latest_version(versions, "c1")
        assert result["version_number"] == 1


class TestCardArchivePattern:
    """Tests for card archive/pin patterns."""

    def test_archive_sets_flag(self):
        card = {"id": "c1", "archived": False}
        card["archived"] = True
        assert card["archived"] is True

    def test_pin_sets_flag(self):
        card = {"id": "c1", "pinned": False}
        card["pinned"] = True
        assert card["pinned"] is True

    def test_unpin_clears_flag(self):
        card = {"id": "c1", "pinned": True}
        card["pinned"] = False
        assert card["pinned"] is False


# --- SubscriptionStorage patterns ---


class TestActiveSubscriptionsPattern:
    """Tests for active subscription filtering."""

    def _get_active(self, subs, user_id=None):
        active = [s for s in subs if s.get("is_active", True)]
        if user_id:
            active = [s for s in active if s.get("user_id") == user_id]
        return active

    def test_filters_active_only(self):
        subs = [
            {"id": "1", "is_active": True},
            {"id": "2", "is_active": False},
            {"id": "3", "is_active": True},
        ]
        result = self._get_active(subs)
        assert len(result) == 2

    def test_filters_by_user(self):
        subs = [
            {"id": "1", "is_active": True, "user_id": "u1"},
            {"id": "2", "is_active": True, "user_id": "u2"},
        ]
        result = self._get_active(subs, "u1")
        assert len(result) == 1
        assert result[0]["user_id"] == "u1"

    def test_defaults_to_active(self):
        subs = [{"id": "1"}]  # No is_active key
        result = self._get_active(subs)
        assert len(result) == 1


class TestDueSubscriptionsPattern:
    """Tests for due subscription detection."""

    def _get_due(self, subs, limit=100):
        now = datetime.now(timezone.utc)
        due = [
            s
            for s in subs
            if s.get("is_active", True)
            and s.get("next_refresh")
            and s["next_refresh"] <= now
        ]
        return due[:limit]

    def test_detects_past_due(self):
        past = datetime.now(timezone.utc) - timedelta(hours=1)
        subs = [{"id": "1", "is_active": True, "next_refresh": past}]
        result = self._get_due(subs)
        assert len(result) == 1

    def test_excludes_future(self):
        future = datetime.now(timezone.utc) + timedelta(hours=1)
        subs = [{"id": "1", "is_active": True, "next_refresh": future}]
        result = self._get_due(subs)
        assert len(result) == 0

    def test_excludes_inactive(self):
        past = datetime.now(timezone.utc) - timedelta(hours=1)
        subs = [{"id": "1", "is_active": False, "next_refresh": past}]
        result = self._get_due(subs)
        assert len(result) == 0

    def test_excludes_no_next_refresh(self):
        subs = [{"id": "1", "is_active": True}]
        result = self._get_due(subs)
        assert len(result) == 0

    def test_respects_limit(self):
        past = datetime.now(timezone.utc) - timedelta(hours=1)
        subs = [
            {"id": str(i), "is_active": True, "next_refresh": past}
            for i in range(10)
        ]
        result = self._get_due(subs, limit=3)
        assert len(result) == 3


class TestRefreshTimeUpdatePattern:
    """Tests for refresh time update patterns."""

    def _update_refresh_time(self, sub, last_refresh, next_refresh):
        sub["last_refresh"] = last_refresh
        sub["next_refresh"] = next_refresh
        return sub

    def test_updates_both_times(self):
        sub = {"id": "1"}
        now = datetime.now(timezone.utc)
        next_time = now + timedelta(hours=1)
        result = self._update_refresh_time(sub, now, next_time)
        assert result["last_refresh"] == now
        assert result["next_refresh"] == next_time

    def test_next_refresh_calculation(self):
        now = datetime.now(timezone.utc)
        interval_minutes = 60
        next_refresh = now + timedelta(minutes=interval_minutes)
        assert next_refresh > now
        delta = (next_refresh - now).total_seconds()
        assert abs(delta - 3600) < 1


class TestSubscriptionStatsPattern:
    """Tests for subscription stats update pattern."""

    def _increment_stats(self, sub, results_count):
        sub["refresh_count"] = sub.get("refresh_count", 0) + 1
        sub["total_results"] = sub.get("total_results", 0) + results_count
        return sub

    def test_increments_refresh_count(self):
        sub = {"refresh_count": 5}
        result = self._increment_stats(sub, 10)
        assert result["refresh_count"] == 6

    def test_adds_results_count(self):
        sub = {"total_results": 50}
        result = self._increment_stats(sub, 10)
        assert result["total_results"] == 60

    def test_initializes_from_zero(self):
        sub = {}
        result = self._increment_stats(sub, 5)
        assert result["refresh_count"] == 1
        assert result["total_results"] == 5


class TestSubscriptionStatusTransitions:
    """Tests for subscription status transition patterns."""

    def test_pause_sets_status(self):
        sub = {"status": "active"}
        sub["status"] = "paused"
        assert sub["status"] == "paused"

    def test_resume_sets_status(self):
        sub = {"status": "paused"}
        sub["status"] = "active"
        assert sub["status"] == "active"

    def test_expire_sets_status(self):
        sub = {"status": "active"}
        sub["status"] = "expired"
        assert sub["status"] == "expired"

    def test_valid_statuses(self):
        valid = ["active", "paused", "expired"]
        for status in valid:
            assert status in valid


# --- RatingStorage patterns ---


class TestRatingUpsertPattern:
    """Tests for rating upsert pattern."""

    def _upsert_rating(self, ratings, user_id, item_id, rating_type, value):
        key = (user_id, item_id, rating_type)
        existing = ratings.get(key)
        if existing:
            existing["value"] = value
            existing["updated_at"] = datetime.now(timezone.utc)
            return existing["id"]
        new_id = str(uuid.uuid4())
        ratings[key] = {
            "id": new_id,
            "user_id": user_id,
            "item_id": item_id,
            "rating_type": rating_type,
            "value": value,
            "created_at": datetime.now(timezone.utc),
        }
        return new_id

    def test_creates_new_rating(self):
        ratings = {}
        rating_id = self._upsert_rating(
            ratings, "u1", "item1", "relevance", "up"
        )
        assert len(ratings) == 1
        assert rating_id is not None

    def test_updates_existing_rating(self):
        ratings = {}
        id1 = self._upsert_rating(ratings, "u1", "item1", "relevance", "up")
        id2 = self._upsert_rating(ratings, "u1", "item1", "relevance", "down")
        assert id1 == id2
        assert len(ratings) == 1


class TestRatingSummaryPattern:
    """Tests for rating summary aggregation."""

    def _get_summary(self, ratings, item_id):
        item_ratings = [r for r in ratings if r.get("item_id") == item_id]
        up_count = sum(1 for r in item_ratings if r.get("value") == "up")
        down_count = sum(1 for r in item_ratings if r.get("value") == "down")
        return {
            "item_id": item_id,
            "up_count": up_count,
            "down_count": down_count,
            "total": len(item_ratings),
        }

    def test_counts_up_votes(self):
        ratings = [
            {"item_id": "i1", "value": "up"},
            {"item_id": "i1", "value": "up"},
            {"item_id": "i1", "value": "down"},
        ]
        summary = self._get_summary(ratings, "i1")
        assert summary["up_count"] == 2

    def test_counts_down_votes(self):
        ratings = [
            {"item_id": "i1", "value": "up"},
            {"item_id": "i1", "value": "down"},
            {"item_id": "i1", "value": "down"},
        ]
        summary = self._get_summary(ratings, "i1")
        assert summary["down_count"] == 2

    def test_total_count(self):
        ratings = [{"item_id": "i1", "value": "up"} for _ in range(5)]
        summary = self._get_summary(ratings, "i1")
        assert summary["total"] == 5

    def test_empty_ratings(self):
        summary = self._get_summary([], "i1")
        assert summary["up_count"] == 0
        assert summary["down_count"] == 0


# --- PreferenceStorage patterns ---


class TestPreferenceUpsertPattern:
    """Tests for preference upsert pattern."""

    def _upsert_preferences(self, storage, user_id, prefs):
        if user_id in storage:
            storage[user_id].update(prefs)
            storage[user_id]["updated_at"] = datetime.now(timezone.utc)
        else:
            storage[user_id] = {
                **prefs,
                "user_id": user_id,
                "created_at": datetime.now(timezone.utc),
            }
        return user_id

    def test_creates_new_preferences(self):
        storage = {}
        self._upsert_preferences(storage, "u1", {"theme": "dark"})
        assert "u1" in storage
        assert storage["u1"]["theme"] == "dark"

    def test_updates_existing_preferences(self):
        storage = {"u1": {"theme": "light"}}
        self._upsert_preferences(storage, "u1", {"theme": "dark"})
        assert storage["u1"]["theme"] == "dark"


class TestLikedItemsPattern:
    """Tests for liked/disliked items management."""

    def _add_liked(self, prefs, item_id):
        if "liked_items" not in prefs:
            prefs["liked_items"] = []
        if item_id not in prefs["liked_items"]:
            prefs["liked_items"].append(item_id)
        return True

    def _add_disliked(self, prefs, item_id):
        if "disliked_items" not in prefs:
            prefs["disliked_items"] = []
        if item_id not in prefs["disliked_items"]:
            prefs["disliked_items"].append(item_id)
        return True

    def test_adds_to_liked(self):
        prefs = {}
        self._add_liked(prefs, "item1")
        assert "item1" in prefs["liked_items"]

    def test_no_duplicate_liked(self):
        prefs = {"liked_items": ["item1"]}
        self._add_liked(prefs, "item1")
        assert prefs["liked_items"].count("item1") == 1

    def test_adds_to_disliked(self):
        prefs = {}
        self._add_disliked(prefs, "item1")
        assert "item1" in prefs["disliked_items"]


# --- SearchHistoryStorage patterns ---


class TestSearchRecordingPattern:
    """Tests for search history recording."""

    def _record_search(self, history, user_id, query, search_data):
        search_id = str(uuid.uuid4())
        history.append(
            {
                "id": search_id,
                "user_id": user_id,
                "query": query,
                "timestamp": datetime.now(timezone.utc),
                **search_data,
            }
        )
        return search_id

    def test_creates_search_record(self):
        history = []
        search_id = self._record_search(history, "u1", "AI news", {})
        assert len(history) == 1
        assert search_id is not None

    def test_includes_timestamp(self):
        history = []
        self._record_search(history, "u1", "AI news", {})
        assert "timestamp" in history[0]

    def test_includes_search_data(self):
        history = []
        self._record_search(history, "u1", "AI", {"results_count": 10})
        assert history[0]["results_count"] == 10


class TestRecentSearchesPattern:
    """Tests for recent searches retrieval."""

    def _get_recent(self, history, user_id, hours=48, limit=50):
        cutoff = datetime.now(timezone.utc) - timedelta(hours=hours)
        user_searches = [
            s
            for s in history
            if s.get("user_id") == user_id
            and s.get("timestamp", cutoff) >= cutoff
        ]
        return user_searches[:limit]

    def test_filters_by_user(self):
        now = datetime.now(timezone.utc)
        history = [
            {"user_id": "u1", "timestamp": now},
            {"user_id": "u2", "timestamp": now},
        ]
        result = self._get_recent(history, "u1")
        assert len(result) == 1

    def test_filters_by_time(self):
        now = datetime.now(timezone.utc)
        old = now - timedelta(hours=100)
        history = [
            {"user_id": "u1", "timestamp": now},
            {"user_id": "u1", "timestamp": old},
        ]
        result = self._get_recent(history, "u1", hours=48)
        assert len(result) == 1

    def test_respects_limit(self):
        now = datetime.now(timezone.utc)
        history = [{"user_id": "u1", "timestamp": now} for _ in range(100)]
        result = self._get_recent(history, "u1", limit=10)
        assert len(result) == 10


class TestSearchSubscriptionLinkPattern:
    """Tests for linking searches to subscriptions."""

    def test_link_creates_reference(self):
        search = {"id": "s1", "subscription_id": None}
        search["subscription_id"] = "sub-123"
        assert search["subscription_id"] == "sub-123"

    def test_link_is_optional(self):
        search = {"id": "s1"}
        assert search.get("subscription_id") is None


# --- NewsItemStorage patterns ---


class TestNewsItemBatchPattern:
    """Tests for batch news item storage."""

    def _store_batch(self, storage, items):
        ids = []
        for item in items:
            item_id = str(uuid.uuid4())
            item["id"] = item_id
            item["created_at"] = datetime.now(timezone.utc)
            storage.append(item)
            ids.append(item_id)
        return ids

    def test_returns_all_ids(self):
        storage = []
        items = [{"headline": "A"}, {"headline": "B"}, {"headline": "C"}]
        ids = self._store_batch(storage, items)
        assert len(ids) == 3

    def test_adds_all_items(self):
        storage = []
        items = [{"headline": "A"}, {"headline": "B"}]
        self._store_batch(storage, items)
        assert len(storage) == 2

    def test_adds_timestamps(self):
        storage = []
        self._store_batch(storage, [{"headline": "A"}])
        assert "created_at" in storage[0]


class TestNewsItemVotesPattern:
    """Tests for news item vote update patterns."""

    def _update_votes(self, item, vote_type):
        if vote_type == "up":
            item["upvotes"] = item.get("upvotes", 0) + 1
        elif vote_type == "down":
            item["downvotes"] = item.get("downvotes", 0) + 1
        return True

    def test_increment_upvotes(self):
        item = {"upvotes": 5}
        self._update_votes(item, "up")
        assert item["upvotes"] == 6

    def test_increment_downvotes(self):
        item = {"downvotes": 3}
        self._update_votes(item, "down")
        assert item["downvotes"] == 4

    def test_initializes_from_zero(self):
        item = {}
        self._update_votes(item, "up")
        assert item["upvotes"] == 1


class TestNewsItemCleanupPattern:
    """Tests for old news item cleanup."""

    def _cleanup_old(self, items, days=7):
        cutoff = datetime.now(timezone.utc) - timedelta(days=days)
        old_items = [i for i in items if i.get("created_at", cutoff) < cutoff]
        for item in old_items:
            items.remove(item)
        return len(old_items)

    def test_removes_old_items(self):
        now = datetime.now(timezone.utc)
        old = now - timedelta(days=10)
        items = [{"id": "1", "created_at": old}, {"id": "2", "created_at": now}]
        deleted = self._cleanup_old(items, days=7)
        assert deleted == 1
        assert len(items) == 1

    def test_keeps_recent_items(self):
        now = datetime.now(timezone.utc)
        items = [{"id": "1", "created_at": now}]
        deleted = self._cleanup_old(items, days=7)
        assert deleted == 0
        assert len(items) == 1

    def test_returns_deleted_count(self):
        old = datetime.now(timezone.utc) - timedelta(days=10)
        items = [{"id": str(i), "created_at": old} for i in range(5)]
        deleted = self._cleanup_old(items, days=7)
        assert deleted == 5


class TestNewsCategoryFilterPattern:
    """Tests for news item category filtering."""

    def _get_by_category(self, items, category, limit=50):
        filtered = [i for i in items if i.get("category") == category]
        return filtered[:limit]

    def test_filters_by_category(self):
        items = [
            {"id": "1", "category": "Tech"},
            {"id": "2", "category": "Science"},
            {"id": "3", "category": "Tech"},
        ]
        result = self._get_by_category(items, "Tech")
        assert len(result) == 2

    def test_empty_for_unknown_category(self):
        items = [{"id": "1", "category": "Tech"}]
        result = self._get_by_category(items, "Sports")
        assert result == []

    def test_respects_limit(self):
        items = [{"id": str(i), "category": "Tech"} for i in range(100)]
        result = self._get_by_category(items, "Tech", limit=10)
        assert len(result) == 10
