"""
Deep behavioral tests for api.py helper logic patterns.
Tests response structure building, parameter validation,
error handling, and list/pagination patterns.
"""


# --- Success response structure ---


class TestSuccessResponseStructure:
    """Tests for success response dictionary structure."""

    def _build_success_response(self, data, message=None):
        response = {"success": True, "data": data}
        if message:
            response["message"] = message
        return response

    def test_has_success_true(self):
        response = self._build_success_response({})
        assert response["success"] is True

    def test_has_data(self):
        response = self._build_success_response({"items": []})
        assert response["data"]["items"] == []

    def test_optional_message(self):
        response = self._build_success_response({}, "Operation completed")
        assert response["message"] == "Operation completed"

    def test_no_message_if_not_provided(self):
        response = self._build_success_response({})
        assert "message" not in response


# --- Error response structure ---


class TestErrorResponseStructure:
    """Tests for error response dictionary structure."""

    def _build_error_response(self, error_message, error_code=None):
        response = {"success": False, "error": error_message}
        if error_code:
            response["error_code"] = error_code
        return response

    def test_has_success_false(self):
        response = self._build_error_response("Error")
        assert response["success"] is False

    def test_has_error_message(self):
        response = self._build_error_response("Something went wrong")
        assert response["error"] == "Something went wrong"

    def test_optional_error_code(self):
        response = self._build_error_response("Error", "INVALID_INPUT")
        assert response["error_code"] == "INVALID_INPUT"


# --- List response structure ---


class TestListResponseStructure:
    """Tests for list response with pagination."""

    def _build_list_response(self, items, total, offset, limit):
        return {
            "success": True,
            "data": {
                "items": items,
                "total": total,
                "offset": offset,
                "limit": limit,
                "has_more": offset + len(items) < total,
            },
        }

    def test_includes_items(self):
        response = self._build_list_response([1, 2, 3], 10, 0, 3)
        assert response["data"]["items"] == [1, 2, 3]

    def test_includes_total(self):
        response = self._build_list_response([1, 2], 50, 0, 10)
        assert response["data"]["total"] == 50

    def test_has_more_true(self):
        response = self._build_list_response([1, 2], 10, 0, 2)
        assert response["data"]["has_more"] is True

    def test_has_more_false(self):
        response = self._build_list_response([1, 2], 2, 0, 10)
        assert response["data"]["has_more"] is False


# --- Limit validation ---


class TestLimitValidation:
    """Tests for limit parameter validation."""

    def _validate_limit(self, limit, min_val=1, max_val=100):
        if limit < min_val:
            raise ValueError(f"Limit must be at least {min_val}")
        if limit > max_val:
            return max_val
        return limit

    def test_valid_limit(self):
        assert self._validate_limit(10) == 10

    def test_limit_below_min_raises(self):
        try:
            self._validate_limit(0)
            assert False, "Should raise ValueError"
        except ValueError:
            pass

    def test_limit_capped_at_max(self):
        assert self._validate_limit(500) == 100


# --- Offset validation ---


class TestOffsetValidation:
    """Tests for offset parameter validation."""

    def _validate_offset(self, offset):
        if offset < 0:
            return 0
        return offset

    def test_valid_offset(self):
        assert self._validate_offset(10) == 10

    def test_negative_offset_clamped(self):
        assert self._validate_offset(-5) == 0


# --- User ID extraction ---


class TestUserIdExtraction:
    """Tests for extracting user ID from session."""

    def _get_user_id(self, session, default="anonymous"):
        return session.get("user_id") or session.get("username") or default

    def test_from_user_id(self):
        session = {"user_id": "user123"}
        assert self._get_user_id(session) == "user123"

    def test_from_username_fallback(self):
        session = {"username": "alice"}
        assert self._get_user_id(session) == "alice"

    def test_default_anonymous(self):
        session = {}
        assert self._get_user_id(session) == "anonymous"


# --- Subscription type validation ---


class TestSubscriptionTypeValidation:
    """Tests for subscription type validation."""

    VALID_TYPES = ["search", "topic"]

    def _is_valid_type(self, sub_type):
        return sub_type in self.VALID_TYPES

    def test_search_valid(self):
        assert self._is_valid_type("search") is True

    def test_topic_valid(self):
        assert self._is_valid_type("topic") is True

    def test_invalid_type(self):
        assert self._is_valid_type("unknown") is False


# --- Status validation ---


class TestStatusValidation:
    """Tests for subscription status validation."""

    VALID_STATUSES = ["active", "paused", "expired"]

    def _is_valid_status(self, status):
        return status in self.VALID_STATUSES

    def test_active_valid(self):
        assert self._is_valid_status("active") is True

    def test_paused_valid(self):
        assert self._is_valid_status("paused") is True

    def test_expired_valid(self):
        assert self._is_valid_status("expired") is True

    def test_invalid_status(self):
        assert self._is_valid_status("deleted") is False


# --- Refresh interval validation ---


class TestRefreshIntervalValidation:
    """Tests for refresh interval validation."""

    MIN_INTERVAL = 15  # 15 minutes
    MAX_INTERVAL = 10080  # 1 week

    def _validate_interval(self, interval):
        if interval < self.MIN_INTERVAL:
            return self.MIN_INTERVAL
        if interval > self.MAX_INTERVAL:
            return self.MAX_INTERVAL
        return interval

    def test_valid_interval(self):
        assert self._validate_interval(60) == 60

    def test_below_min_clamped(self):
        assert self._validate_interval(5) == 15

    def test_above_max_clamped(self):
        assert self._validate_interval(20000) == 10080


# --- Query string validation ---


class TestQueryStringValidation:
    """Tests for query string validation."""

    def _is_valid_query(self, query):
        return query and len(query.strip()) >= 3

    def test_valid_query(self):
        assert self._is_valid_query("AI news") is True

    def test_short_query_invalid(self):
        assert self._is_valid_query("AI") is False

    def test_empty_query_invalid(self):
        assert not self._is_valid_query("")

    def test_whitespace_only_invalid(self):
        assert self._is_valid_query("   ") is False


# --- Subscription create response ---


class TestSubscriptionCreateResponse:
    """Tests for subscription creation response."""

    def _build_create_response(self, subscription_id, query_or_topic, sub_type):
        return {
            "success": True,
            "data": {
                "subscription_id": subscription_id,
                "query_or_topic": query_or_topic,
                "subscription_type": sub_type,
                "status": "active",
            },
            "message": f"{sub_type.title()} subscription created successfully",
        }

    def test_has_subscription_id(self):
        response = self._build_create_response("sub-123", "AI", "topic")
        assert response["data"]["subscription_id"] == "sub-123"

    def test_status_active(self):
        response = self._build_create_response("sub-123", "AI", "topic")
        assert response["data"]["status"] == "active"

    def test_message_includes_type(self):
        response = self._build_create_response("sub-123", "AI", "search")
        assert "Search" in response["message"]


# --- Subscription delete response ---


class TestSubscriptionDeleteResponse:
    """Tests for subscription deletion response."""

    def _build_delete_response(self, subscription_id):
        return {
            "success": True,
            "data": {"subscription_id": subscription_id, "deleted": True},
            "message": "Subscription deleted successfully",
        }

    def test_deleted_true(self):
        response = self._build_delete_response("sub-123")
        assert response["data"]["deleted"] is True


# --- Feed response structure ---


class TestFeedResponseStructure:
    """Tests for feed response structure."""

    def _build_feed_response(self, cards, total, user_id):
        return {
            "success": True,
            "data": {
                "cards": cards,
                "total": total,
                "user_id": user_id,
            },
        }

    def test_has_cards(self):
        response = self._build_feed_response([{"id": "1"}], 1, "user")
        assert len(response["data"]["cards"]) == 1

    def test_has_user_id(self):
        response = self._build_feed_response([], 0, "user123")
        assert response["data"]["user_id"] == "user123"


# --- Preferences response structure ---


class TestPreferencesResponseStructure:
    """Tests for preferences response structure."""

    def _build_preferences_response(self, user_id, preferences):
        return {
            "success": True,
            "data": {"user_id": user_id, "preferences": preferences},
        }

    def test_has_preferences(self):
        prefs = {"liked_categories": ["Tech"]}
        response = self._build_preferences_response("u1", prefs)
        assert response["data"]["preferences"]["liked_categories"] == ["Tech"]


# --- Rating response structure ---


class TestRatingResponseStructure:
    """Tests for rating response structure."""

    def _build_rating_response(self, card_id, rating_type, value):
        return {
            "success": True,
            "data": {
                "card_id": card_id,
                "rating_type": rating_type,
                "value": value,
            },
            "message": "Rating recorded",
        }

    def test_has_rating_value(self):
        response = self._build_rating_response("c1", "relevance", 1)
        assert response["data"]["value"] == 1


# --- Feature disabled response ---


class TestFeatureDisabledResponse:
    """Tests for feature disabled response."""

    def _build_disabled_response(self, feature):
        return {
            "success": False,
            "error": f"{feature} is disabled",
            "error_code": "FEATURE_DISABLED",
        }

    def test_error_message(self):
        response = self._build_disabled_response("News")
        assert "disabled" in response["error"]

    def test_error_code(self):
        response = self._build_disabled_response("News")
        assert response["error_code"] == "FEATURE_DISABLED"


# --- Not found response ---


class TestNotFoundResponse:
    """Tests for not found response."""

    def _build_not_found_response(self, resource_type, resource_id):
        return {
            "success": False,
            "error": f"{resource_type} not found: {resource_id}",
            "error_code": "NOT_FOUND",
        }

    def test_error_includes_id(self):
        response = self._build_not_found_response("Subscription", "sub-123")
        assert "sub-123" in response["error"]

    def test_error_code_not_found(self):
        response = self._build_not_found_response("Card", "c1")
        assert response["error_code"] == "NOT_FOUND"


# --- Batch operation response ---


class TestBatchOperationResponse:
    """Tests for batch operation response."""

    def _build_batch_response(self, total, successful, failed):
        return {
            "success": failed == 0,
            "data": {
                "total": total,
                "successful": successful,
                "failed": failed,
            },
        }

    def test_all_successful(self):
        response = self._build_batch_response(10, 10, 0)
        assert response["success"] is True

    def test_some_failed(self):
        response = self._build_batch_response(10, 8, 2)
        assert response["success"] is False

    def test_counts_correct(self):
        response = self._build_batch_response(10, 7, 3)
        assert response["data"]["successful"] == 7
        assert response["data"]["failed"] == 3
