"""
Deep behavioral tests for subscription_manager/storage.py pure logic.
Tests updateable field validation, status transitions, refresh time
calculation, list filtering patterns, and storage data mapping.
"""

from datetime import datetime, timedelta, timezone


# --- Updateable fields validation ---


class TestUpdateableFields:
    """Tests for subscription update field validation."""

    UPDATEABLE_FIELDS = [
        "name",
        "refresh_interval_minutes",
        "status",
        "is_active",
        "expires_at",
        "folder_id",
        "model_provider",
        "model",
        "search_strategy",
        "custom_endpoint",
        "search_engine",
        "search_iterations",
        "questions_per_iteration",
    ]

    def test_name_is_updateable(self):
        assert "name" in self.UPDATEABLE_FIELDS

    def test_refresh_interval_is_updateable(self):
        assert "refresh_interval_minutes" in self.UPDATEABLE_FIELDS

    def test_status_is_updateable(self):
        assert "status" in self.UPDATEABLE_FIELDS

    def test_is_active_is_updateable(self):
        assert "is_active" in self.UPDATEABLE_FIELDS

    def test_expires_at_is_updateable(self):
        assert "expires_at" in self.UPDATEABLE_FIELDS

    def test_folder_id_is_updateable(self):
        assert "folder_id" in self.UPDATEABLE_FIELDS

    def test_model_provider_is_updateable(self):
        assert "model_provider" in self.UPDATEABLE_FIELDS

    def test_model_is_updateable(self):
        assert "model" in self.UPDATEABLE_FIELDS

    def test_search_strategy_is_updateable(self):
        assert "search_strategy" in self.UPDATEABLE_FIELDS

    def test_custom_endpoint_is_updateable(self):
        assert "custom_endpoint" in self.UPDATEABLE_FIELDS

    def test_search_engine_is_updateable(self):
        assert "search_engine" in self.UPDATEABLE_FIELDS

    def test_search_iterations_is_updateable(self):
        assert "search_iterations" in self.UPDATEABLE_FIELDS

    def test_questions_per_iteration_is_updateable(self):
        assert "questions_per_iteration" in self.UPDATEABLE_FIELDS

    def test_id_not_updateable(self):
        assert "id" not in self.UPDATEABLE_FIELDS

    def test_user_id_not_updateable(self):
        assert "user_id" not in self.UPDATEABLE_FIELDS

    def test_created_at_not_updateable(self):
        assert "created_at" not in self.UPDATEABLE_FIELDS

    def test_query_or_topic_not_updateable(self):
        assert "query_or_topic" not in self.UPDATEABLE_FIELDS

    def test_subscription_type_not_updateable(self):
        assert "subscription_type" not in self.UPDATEABLE_FIELDS


class TestUpdateFieldFiltering:
    """Tests for filtering update data to valid fields."""

    UPDATEABLE = {
        "name",
        "refresh_interval_minutes",
        "status",
        "is_active",
    }

    def _filter_update(self, data):
        return {k: v for k, v in data.items() if k in self.UPDATEABLE}

    def test_filters_invalid_fields(self):
        data = {"name": "New Name", "id": "should-not-update"}
        filtered = self._filter_update(data)
        assert "id" not in filtered
        assert filtered["name"] == "New Name"

    def test_preserves_valid_fields(self):
        data = {"name": "X", "refresh_interval_minutes": 60, "status": "paused"}
        filtered = self._filter_update(data)
        assert len(filtered) == 3

    def test_empty_data(self):
        assert self._filter_update({}) == {}

    def test_all_invalid_fields(self):
        data = {"id": "1", "user_id": "u1", "created_at": "2025-01-01"}
        assert self._filter_update(data) == {}


# --- Next refresh calculation ---


class TestNextRefreshCalculation:
    """Tests for next_refresh time calculation."""

    def _calc_next_refresh(self, minutes, base_time=None):
        base = base_time or datetime.now(timezone.utc)
        return base + timedelta(minutes=minutes)

    def test_60_minutes(self):
        base = datetime(2025, 6, 15, 10, 0, tzinfo=timezone.utc)
        result = self._calc_next_refresh(60, base)
        assert result == datetime(2025, 6, 15, 11, 0, tzinfo=timezone.utc)

    def test_240_minutes(self):
        base = datetime(2025, 6, 15, 10, 0, tzinfo=timezone.utc)
        result = self._calc_next_refresh(240, base)
        assert result == datetime(2025, 6, 15, 14, 0, tzinfo=timezone.utc)

    def test_1440_minutes_daily(self):
        base = datetime(2025, 6, 15, 10, 0, tzinfo=timezone.utc)
        result = self._calc_next_refresh(1440, base)
        assert result == datetime(2025, 6, 16, 10, 0, tzinfo=timezone.utc)

    def test_zero_minutes(self):
        base = datetime(2025, 6, 15, 10, 0, tzinfo=timezone.utc)
        result = self._calc_next_refresh(0, base)
        assert result == base

    def test_small_interval(self):
        base = datetime(2025, 6, 15, 10, 0, tzinfo=timezone.utc)
        result = self._calc_next_refresh(5, base)
        assert result == datetime(2025, 6, 15, 10, 5, tzinfo=timezone.utc)


class TestUpdateTriggersNextRefreshRecalc:
    """Tests for refresh interval change triggering next_refresh update."""

    def _needs_recalc(self, data):
        return "refresh_interval_minutes" in data

    def test_interval_change_needs_recalc(self):
        assert self._needs_recalc({"refresh_interval_minutes": 120}) is True

    def test_name_change_no_recalc(self):
        assert self._needs_recalc({"name": "New Name"}) is False

    def test_status_change_no_recalc(self):
        assert self._needs_recalc({"status": "paused"}) is False

    def test_mixed_changes_with_interval(self):
        data = {"name": "X", "refresh_interval_minutes": 60}
        assert self._needs_recalc(data) is True

    def test_empty_data(self):
        assert self._needs_recalc({}) is False


# --- List filter patterns ---


class TestListFilterPatterns:
    """Tests for list filtering logic patterns."""

    def _should_filter_user(self, filters):
        return filters and "user_id" in filters

    def _should_filter_status(self, filters):
        return filters and "status" in filters

    def _should_filter_type(self, filters):
        return filters and "subscription_type" in filters

    def test_user_id_filter(self):
        assert self._should_filter_user({"user_id": "u1"}) is True

    def test_no_user_id_filter(self):
        assert self._should_filter_user({"status": "active"}) is False

    def test_status_filter(self):
        assert self._should_filter_status({"status": "active"}) is True

    def test_no_status_filter(self):
        assert self._should_filter_status({"user_id": "u1"}) is False

    def test_type_filter(self):
        assert self._should_filter_type({"subscription_type": "search"}) is True

    def test_no_filters(self):
        assert not self._should_filter_user(None)
        assert not self._should_filter_status(None)
        assert not self._should_filter_type(None)

    def test_empty_filters(self):
        assert not self._should_filter_user({})


# --- Due subscriptions logic ---


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

    def _is_due(self, next_refresh, now=None):
        now = now or datetime.now(timezone.utc)
        return next_refresh <= now

    def test_past_is_due(self):
        now = datetime(2025, 6, 15, 12, 0, tzinfo=timezone.utc)
        next_refresh = datetime(2025, 6, 15, 10, 0, tzinfo=timezone.utc)
        assert self._is_due(next_refresh, now) is True

    def test_future_not_due(self):
        now = datetime(2025, 6, 15, 10, 0, tzinfo=timezone.utc)
        next_refresh = datetime(2025, 6, 15, 12, 0, tzinfo=timezone.utc)
        assert self._is_due(next_refresh, now) is False

    def test_exactly_now_is_due(self):
        now = datetime(2025, 6, 15, 12, 0, tzinfo=timezone.utc)
        next_refresh = datetime(2025, 6, 15, 12, 0, tzinfo=timezone.utc)
        assert self._is_due(next_refresh, now) is True

    def test_one_second_past(self):
        now = datetime(2025, 6, 15, 12, 0, 1, tzinfo=timezone.utc)
        next_refresh = datetime(2025, 6, 15, 12, 0, 0, tzinfo=timezone.utc)
        assert self._is_due(next_refresh, now) is True

    def test_one_second_future(self):
        now = datetime(2025, 6, 15, 12, 0, 0, tzinfo=timezone.utc)
        next_refresh = datetime(2025, 6, 15, 12, 0, 1, tzinfo=timezone.utc)
        assert self._is_due(next_refresh, now) is False


# --- Pause/resume status transitions ---


class TestPauseResumeStatusTransitions:
    """Tests for pause/resume status validation."""

    def _can_pause(self, status):
        return status == "active"

    def _can_resume(self, status):
        return status == "paused"

    def test_can_pause_active(self):
        assert self._can_pause("active") is True

    def test_cannot_pause_paused(self):
        assert self._can_pause("paused") is False

    def test_cannot_pause_expired(self):
        assert self._can_pause("expired") is False

    def test_can_resume_paused(self):
        assert self._can_resume("paused") is True

    def test_cannot_resume_active(self):
        assert self._can_resume("active") is False

    def test_cannot_resume_expired(self):
        assert self._can_resume("expired") is False


# --- Increment stats logic ---


class TestIncrementStatsLogic:
    """Tests for stats increment patterns."""

    def _increment(self, current, amount=1):
        return current + amount

    def test_increment_from_zero(self):
        assert self._increment(0) == 1

    def test_increment_from_existing(self):
        assert self._increment(5) == 6

    def test_increment_by_custom_amount(self):
        assert self._increment(3, 5) == 8

    def test_keep_in_sync(self):
        refresh_count = 10
        total_runs = self._increment(refresh_count - 1)
        assert total_runs == refresh_count


# --- Subscription dict mapping ---


class TestSubscriptionDictMapping:
    """Tests for subscription to dict mapping."""

    def _map_list_item(self, sub_dict):
        return {
            "id": sub_dict.get("id"),
            "user_id": sub_dict.get("user_id"),
            "name": sub_dict.get("name"),
            "subscription_type": sub_dict.get("subscription_type"),
            "query_or_topic": sub_dict.get("query_or_topic"),
            "refresh_interval_minutes": sub_dict.get(
                "refresh_interval_minutes"
            ),
            "created_at": sub_dict.get("created_at"),
            "updated_at": sub_dict.get("updated_at"),
            "last_refresh": sub_dict.get("last_refresh"),
            "next_refresh": sub_dict.get("next_refresh"),
            "status": sub_dict.get("status"),
            "folder": sub_dict.get("folder"),
            "notes": sub_dict.get("notes"),
        }

    def test_preserves_id(self):
        data = {"id": "sub-123"}
        assert self._map_list_item(data)["id"] == "sub-123"

    def test_preserves_user_id(self):
        data = {"user_id": "u1"}
        assert self._map_list_item(data)["user_id"] == "u1"

    def test_preserves_query_or_topic(self):
        data = {"query_or_topic": "AI news"}
        assert self._map_list_item(data)["query_or_topic"] == "AI news"

    def test_missing_fields_are_none(self):
        data = {"id": "1"}
        result = self._map_list_item(data)
        assert result["name"] is None
        assert result["folder"] is None


class TestFullSubscriptionDictMapping:
    """Tests for full subscription get() mapping."""

    def _has_full_fields(self, result):
        full_fields = [
            "id",
            "user_id",
            "name",
            "subscription_type",
            "query_or_topic",
            "refresh_interval_minutes",
            "created_at",
            "updated_at",
            "last_refresh",
            "next_refresh",
            "expires_at",
            "source_type",
            "source_id",
            "created_from",
            "folder",
            "folder_id",
            "notes",
            "status",
            "is_active",
            "refresh_count",
            "results_count",
            "last_error",
            "error_count",
            "model_provider",
            "model",
            "search_strategy",
            "custom_endpoint",
            "search_engine",
            "search_iterations",
            "questions_per_iteration",
        ]
        return all(f in result for f in full_fields)

    def test_full_mapping_has_all_fields(self):
        result = {
            "id": "1",
            "user_id": "u1",
            "name": "Test",
            "subscription_type": "search",
            "query_or_topic": "AI",
            "refresh_interval_minutes": 60,
            "created_at": None,
            "updated_at": None,
            "last_refresh": None,
            "next_refresh": None,
            "expires_at": None,
            "source_type": None,
            "source_id": None,
            "created_from": None,
            "folder": None,
            "folder_id": None,
            "notes": None,
            "status": "active",
            "is_active": True,
            "refresh_count": 0,
            "results_count": 0,
            "last_error": None,
            "error_count": 0,
            "model_provider": None,
            "model": None,
            "search_strategy": None,
            "custom_endpoint": None,
            "search_engine": None,
            "search_iterations": 3,
            "questions_per_iteration": 5,
        }
        assert self._has_full_fields(result)


# --- Create data defaults ---


class TestCreateDataDefaults:
    """Tests for create subscription data defaults."""

    def _apply_defaults(self, data):
        return {
            "id": data.get("id") or "generated-id",
            "frequency": data.get("frequency", "daily"),
            "status": data.get("status", "active"),
            "is_active": data.get("is_active", True),
            "search_iterations": data.get("search_iterations", 3),
            "questions_per_iteration": data.get("questions_per_iteration", 5),
        }

    def test_default_frequency(self):
        result = self._apply_defaults({})
        assert result["frequency"] == "daily"

    def test_default_status(self):
        result = self._apply_defaults({})
        assert result["status"] == "active"

    def test_default_is_active(self):
        result = self._apply_defaults({})
        assert result["is_active"] is True

    def test_default_search_iterations(self):
        result = self._apply_defaults({})
        assert result["search_iterations"] == 3

    def test_default_questions_per_iteration(self):
        result = self._apply_defaults({})
        assert result["questions_per_iteration"] == 5

    def test_custom_frequency(self):
        result = self._apply_defaults({"frequency": "hourly"})
        assert result["frequency"] == "hourly"

    def test_custom_status(self):
        result = self._apply_defaults({"status": "paused"})
        assert result["status"] == "paused"

    def test_generated_id_when_missing(self):
        result = self._apply_defaults({})
        assert result["id"] == "generated-id"

    def test_provided_id_preserved(self):
        result = self._apply_defaults({"id": "my-id"})
        assert result["id"] == "my-id"


# --- Getattr defaults ---


class TestGetattrDefaults:
    """Tests for getattr default value patterns."""

    def _get_with_default(self, obj, field, default):
        return getattr(obj, field, default)

    def test_is_active_default_true(self):
        class Obj:
            pass

        assert self._get_with_default(Obj(), "is_active", True) is True

    def test_search_iterations_default_3(self):
        class Obj:
            pass

        assert self._get_with_default(Obj(), "search_iterations", 3) == 3

    def test_questions_per_iteration_default_5(self):
        class Obj:
            pass

        assert self._get_with_default(Obj(), "questions_per_iteration", 5) == 5

    def test_existing_value_preserved(self):
        class Obj:
            is_active = False

        assert self._get_with_default(Obj(), "is_active", True) is False


# --- Resume next_refresh calculation ---


class TestResumeNextRefreshCalculation:
    """Tests for next_refresh calculation on resume."""

    def _calc_resume_next(self, interval_minutes):
        return datetime.now(timezone.utc) + timedelta(minutes=interval_minutes)

    def test_resume_60_min(self):
        result = self._calc_resume_next(60)
        now = datetime.now(timezone.utc)
        diff = (result - now).total_seconds()
        assert 3500 < diff < 3700  # ~60 minutes

    def test_resume_240_min(self):
        result = self._calc_resume_next(240)
        now = datetime.now(timezone.utc)
        diff = (result - now).total_seconds()
        assert 14300 < diff < 14500  # ~240 minutes


# --- Expire subscription logic ---


class TestExpireSubscriptionLogic:
    """Tests for subscription expiration patterns."""

    def _expire(self, status):
        return {
            "status": "expired",
            "expires_at": datetime.now(timezone.utc),
        }

    def test_expired_status(self):
        result = self._expire("active")
        assert result["status"] == "expired"

    def test_expires_at_set(self):
        result = self._expire("active")
        assert result["expires_at"] is not None

    def test_expires_at_is_now(self):
        before = datetime.now(timezone.utc)
        result = self._expire("active")
        after = datetime.now(timezone.utc)
        assert before <= result["expires_at"] <= after
