arcane_framework/test/services/logging/logging_service_test.dart

import "package:arcane_framework/arcane_framework.dart";
import "package:flutter_test/flutter_test.dart";

class TestLoggingInterface extends LoggingInterface with LoggingInitialization {
  TestLoggingInterface(this.name);

  final String name;
  int initCallCount = 0;
  final List<LogEvent> events = [];

  @override
  Future<void> init() async {
    await super.init();
    initCallCount += 1;
  }

  @override
  void log(
    String message, {
    Map<String, Object?>? metadata,
    Level? level,
    StackTrace? stackTrace,
    Object? extra,
  }) {
    events.add(
      LogEvent(
        message: message,
        metadata: metadata == null ? null : Map<String, Object?>.from(metadata),
        level: level,
        stackTrace: stackTrace,
        extra: extra,
      ),
    );
  }
}

class TestPassiveLoggingInterface extends LoggingInterface {
  TestPassiveLoggingInterface(this.name);

  final String name;
  final List<LogEvent> events = [];

  @override
  void log(
    String message, {
    Map<String, Object?>? metadata,
    Level? level,
    StackTrace? stackTrace,
    Object? extra,
  }) {
    events.add(
      LogEvent(
        message: message,
        metadata: metadata == null ? null : Map<String, Object?>.from(metadata),
        level: level,
        stackTrace: stackTrace,
        extra: extra,
      ),
    );
  }
}

class TestAlternativeLoggingInterface extends LoggingInterface {
  TestAlternativeLoggingInterface(this.name);

  final String name;
  final List<LogEvent> events = [];

  @override
  void log(
    String message, {
    Map<String, Object?>? metadata,
    Level? level,
    StackTrace? stackTrace,
    Object? extra,
  }) {
    events.add(
      LogEvent(
        message: message,
        metadata: metadata == null ? null : Map<String, Object?>.from(metadata),
        level: level,
        stackTrace: stackTrace,
        extra: extra,
      ),
    );
  }
}

class TestDerivedLoggingInterface extends TestLoggingInterface {
  TestDerivedLoggingInterface(super.name);
}

class RedactingLogInterceptor implements LogInterceptor {
  const RedactingLogInterceptor();

  @override
  LogEvent? call(
    LogEvent event, {
    required LogInterceptorContext context,
  }) {
    final Object? token = event.metadata?["token"];
    if (token == null) return event;

    return event.copyWith(
      metadata: {
        ...?event.metadata,
        "token": "[redacted]",
      },
    );
  }
}

class TestLoggerWithLoggerName extends LoggingInterface with LoggerName {
  @override
  String get name => "test-logger";

  final List<LogEvent> events = [];

  @override
  void log(
    String message, {
    Map<String, Object?>? metadata,
    Level? level,
    StackTrace? stackTrace,
    Object? extra,
  }) {
    events.add(
      LogEvent(
        message: message,
        metadata: metadata == null ? null : Map<String, Object?>.from(metadata),
        level: level,
        stackTrace: stackTrace,
        extra: extra,
      ),
    );
  }
}

void main() {
  late TestLoggingInterface myInterface;
  late LogInterceptor prefixInterceptor;
  final TestLoggerWithLoggerName loggerWithLoggerName =
      TestLoggerWithLoggerName();

  setUp(() {
    Arcane.logger.reset();
    myInterface = TestLoggingInterface("primary");
    prefixInterceptor = LogInterceptor(
      (event, context) {
        return event.copyWith(message: "[global] ${event.message}");
      },
    );
  });

  group("ArcaneLogger", () {
    group("stream lifecycle", () {
      test("logStream remains usable after listener cancellation", () async {
        String? firstMessage;
        final firstSubscription = Arcane.logger.logStream.listen((message) {
          firstMessage = message;
        });

        Arcane.log("first");
        await Future<void>.delayed(Duration.zero);
        expect(firstMessage, contains("first"));

        await firstSubscription.cancel();

        String? secondMessage;
        final secondSubscription = Arcane.logger.logStream.listen((message) {
          secondMessage = message;
        });

        Arcane.log("second");
        await Future<void>.delayed(Duration.zero);
        expect(secondMessage, contains("second"));

        await secondSubscription.cancel();
      });
    });

    group("interface management", () {
      test("registerInterfaces adds interfaces correctly", () async {
        await Arcane.logger.registerInterface(myInterface);

        expect(
          Arcane.logger.interfaces,
          contains(isA<LoggingInterface>()),
        );
      });

      test("registering an interface doesn't initialize it", () async {
        await Arcane.logger.registerInterface(myInterface);

        expect(Arcane.logger.interfaces.first, isA<LoggingInterface>());

        expect(myInterface.initialized, false);
        expect(myInterface.initCallCount, 0);
      });

      test("registering an interface initializes the logger", () async {
        expect(Arcane.logger.initialized, false);

        await Arcane.logger.registerInterface(myInterface);

        expect(Arcane.logger.initialized, true);
      });

      test("interfaces can be initialized through the logger", () async {
        await Arcane.logger.registerInterface(myInterface);

        expect(myInterface.initialized, false);

        await Arcane.logger.initializeInterfaces();

        expect(myInterface.initCallCount, 1);
      });

      test("non-initializable interfaces are skipped by initializeInterfaces",
          () async {
        final TestPassiveLoggingInterface passiveInterface =
            TestPassiveLoggingInterface("passive");

        await Arcane.logger.registerInterfaces([
          myInterface,
          passiveInterface,
        ]);

        await Arcane.logger.initializeInterfaces();

        expect(myInterface.initCallCount, 1);

        Arcane.log("hello");

        expect(myInterface.events.single.message, "hello");
        expect(passiveInterface.events.single.message, "hello");
      });

      test("multiple interfaces can be registered", () async {
        await Arcane.logger.registerInterfaces([
          TestLoggingInterface("first"),
          TestLoggingInterface("second"),
        ]);

        expect(
          Arcane.logger.interfaces,
          contains(isA<TestLoggingInterface>()),
        );
        expect(
          Arcane.logger.interfaces.length,
          2,
        );
      });

      test("global interceptors can be registered at runtime", () async {
        await Arcane.logger.registerInterface(myInterface);

        Arcane.log("before");
        Arcane.logger.interceptors.add(prefixInterceptor);
        Arcane.log("after");

        expect(myInterface.events[0].message, "before");
        expect(myInterface.events[1].message, "[global] after");
      });

      test("interceptor collection add defaults to global", () async {
        await Arcane.logger.registerInterface(myInterface);

        Arcane.log("before");
        Arcane.logger.interceptors.add(prefixInterceptor);
        Arcane.log("after");

        expect(myInterface.events[0].message, "before");
        expect(myInterface.events[1].message, "[global] after");
      });

      test("interface interceptors can be registered at runtime", () async {
        final LogInterceptor dropForPrimary = LogInterceptor(
          (event, context) {
            if ((context.interface as TestLoggingInterface).name == "primary") {
              return null;
            }

            return event;
          },
        );

        await Arcane.logger.registerInterface(myInterface);

        Arcane.log("before");
        Arcane.logger.interceptors.add(
          dropForPrimary,
          matcher: (LoggingInterface interface) =>
              interface is TestLoggingInterface,
        );
        Arcane.log("blocked");

        expect(
          myInterface.events.map((LogEvent event) => event.message),
          ["before"],
        );
      });

      test("type-scoped interceptors only apply to matching interfaces",
          () async {
        final TestAlternativeLoggingInterface alternativeInterface =
            TestAlternativeLoggingInterface("alternative");

        await Arcane.logger.registerInterfaces([
          myInterface,
          alternativeInterface,
        ]);

        Arcane.logger.interceptors.add(
          LogInterceptor((event, context) {
            return event.copyWith(message: "[typed] ${event.message}");
          }),
          matcher: (LoggingInterface interface) =>
              interface is TestLoggingInterface,
        );

        Arcane.log("typed");

        expect(myInterface.events.last.message, "[typed] typed");
        expect(alternativeInterface.events.last.message, "typed");
      });

      test("matcher-based type-scoped interceptors can include subtypes",
          () async {
        final TestDerivedLoggingInterface derivedInterface =
            TestDerivedLoggingInterface("derived");
        final TestAlternativeLoggingInterface alternativeInterface =
            TestAlternativeLoggingInterface("alternative");

        await Arcane.logger.registerInterfaces([
          myInterface,
          derivedInterface,
          alternativeInterface,
        ]);

        Arcane.logger.interceptors.add(
          LogInterceptor((event, context) {
            return event.copyWith(message: "[family] ${event.message}");
          }),
          matcher: (LoggingInterface interface) =>
              interface is TestLoggingInterface,
        );

        Arcane.log("typed");

        expect(myInterface.events.last.message, "[family] typed");
        expect(derivedInterface.events.last.message, "[family] typed");
        expect(alternativeInterface.events.last.message, "typed");
      });

      test(
          "registering a type-scoped interceptor before matching interface exists stores it for future registrations",
          () async {
        final TestLoggingInterface secondary =
            TestLoggingInterface("secondary");

        Arcane.logger.interceptors.add(
          LogInterceptor((event, context) {
            return event.copyWith(message: "[future] ${event.message}");
          }),
          matcher: (LoggingInterface interface) =>
              interface is TestLoggingInterface,
        );

        await Arcane.logger.registerInterface(secondary);
        Arcane.log("hello");

        expect(secondary.events.single.message, "[future] hello");
      });
    });

    group("persistent metadata", () {
      test("addPersistentMetadata adds metadata correctly", () {
        Arcane.logger.addPersistentMetadata({"test": "value"});
        expect(Arcane.logger.additionalMetadata["test"], equals("value"));
      });

      test("removePersistentMetadata removes specific key", () {
        Arcane.logger.addPersistentMetadata({"test": "value", "keep": "this"});
        Arcane.logger.removePersistentMetadata("test");
        expect(Arcane.logger.additionalMetadata.containsKey("test"), false);
        expect(Arcane.logger.additionalMetadata["keep"], equals("this"));
      });

      test("clearPersistentMetadata removes all metadata", () {
        Arcane.logger
            .addPersistentMetadata({"test": "value", "another": "value"});
        Arcane.logger.clearPersistentMetadata();
        expect(Arcane.logger.additionalMetadata.isEmpty, true);
      });
    });

    group("logging messages", () {
      const String logMessage = "Test";

      setUp(() async {
        await Arcane.logger.registerInterface(myInterface);
      });

      test("logging a basic message works", () async {
        Arcane.log(logMessage);

        expect(myInterface.events.single.message, logMessage);
      });

      test("logging at a different level works", () async {
        Arcane.log(
          logMessage,
          level: Level.info,
        );

        expect(myInterface.events.last.level, Level.info);

        Arcane.log(
          logMessage,
          level: Level.warning,
        );

        expect(myInterface.events.last.level, Level.warning);
      });

      test("logging a stacktrace works", () async {
        final stackTrace = StackTrace.current;
        Arcane.log(logMessage, stackTrace: stackTrace);

        expect(myInterface.events.single.stackTrace, stackTrace);
      });

      test("logging an extra object works", () async {
        const bool extraObject = true;
        Arcane.log(
          logMessage,
          extra: extraObject,
        );

        expect(myInterface.events.single.extra, extraObject);
      });

      test("logging metadata works", () async {
        final Map<String, String> metadata = {"test": "value"};
        Arcane.log(
          logMessage,
          metadata: metadata,
        );

        expect(myInterface.events.single.metadata?["test"], "value");
        expect(
          myInterface.events.single.metadata?.containsKey("timestamp"),
          true,
        );
      });

      test("global interceptors run in registration order", () async {
        Arcane.logger.interceptors.addAll([
          LogInterceptor((event, context) {
            expect(context.interface, same(myInterface));
            return event.copyWith(message: "${event.message}:first");
          }),
          LogInterceptor((event, context) {
            expect(context.interface, same(myInterface));
            return event.copyWith(message: "${event.message}:second");
          }),
        ]);

        Arcane.log(logMessage);

        expect(myInterface.events.single.message, "Test:first:second");
      });

      test("global interceptors can drop events for all interfaces", () async {
        await Arcane.logger.registerInterface(myInterface);
        Arcane.logger.interceptors.add(
          LogInterceptor((event, context) => null),
        );

        Arcane.log(logMessage);

        expect(myInterface.events, isEmpty);
      });

      test("interceptor collection remove defaults to global", () async {
        Arcane.logger.interceptors.add(prefixInterceptor);
        Arcane.logger.interceptors.remove(prefixInterceptor);

        Arcane.log(logMessage);

        expect(myInterface.events.single.message, logMessage);
      });

      test("custom interceptor classes can implement LogInterceptor", () async {
        Arcane.logger.interceptors.add(const RedactingLogInterceptor());

        Arcane.log(
          logMessage,
          metadata: {"token": "secret-token"},
        );

        expect(
          myInterface.events.single.metadata?["token"],
          "[redacted]",
        );
      });

      test("interface interceptors can drop events per destination", () async {
        final TestLoggingInterface secondaryInterface =
            TestLoggingInterface("secondary");
        final LogInterceptor allowPrimaryOnly = LogInterceptor(
          (event, context) {
            final String name =
                (context.interface as TestLoggingInterface).name;
            return name == "primary" ? event : null;
          },
        );

        Arcane.logger.interceptors.add(
          allowPrimaryOnly,
          matcher: (LoggingInterface interface) =>
              interface is TestLoggingInterface,
        );
        await Arcane.logger.registerInterface(
          secondaryInterface,
        );

        Arcane.log(logMessage);

        expect(myInterface.events.single.message, logMessage);
        expect(secondaryInterface.events, isEmpty);
      });

      test("interceptor collection remove with matcher removes scoped entries",
          () async {
        final TestLoggingInterface secondaryInterface =
            TestLoggingInterface("secondary");
        final LogInterceptor scopedInterceptor =
            LogInterceptor((event, context) {
          return event.copyWith(message: "[scoped] ${event.message}");
        });
        bool scopedMatcher(LoggingInterface interface) =>
            interface is TestLoggingInterface;

        Arcane.logger.interceptors.add(
          scopedInterceptor,
          matcher: scopedMatcher,
        );

        await Arcane.logger.registerInterface(secondaryInterface);
        Arcane.logger.interceptors.remove(
          scopedInterceptor,
          matcher: scopedMatcher,
        );

        Arcane.log(logMessage);

        expect(myInterface.events.single.message, logMessage);
        expect(secondaryInterface.events.single.message, logMessage);
      });

      test("interface interceptors receive the current interface", () async {
        final TestLoggingInterface secondaryInterface =
            TestLoggingInterface("secondary");

        Arcane.logger.interceptors.add(
          LogInterceptor((event, context) {
            final TestLoggingInterface currentInterface =
                context.interface! as TestLoggingInterface;
            return event.copyWith(
              metadata: {
                ...?event.metadata,
                "target": currentInterface.name,
              },
            );
          }),
          matcher: (LoggingInterface interface) =>
              interface is TestLoggingInterface,
        );
        await Arcane.logger.registerInterface(
          secondaryInterface,
        );

        Arcane.log(logMessage);

        expect(myInterface.events.single.metadata?["target"], "primary");
        expect(
          secondaryInterface.events.single.metadata?["target"],
          "secondary",
        );
      });

      test("interface interceptors cannot mutate sibling interface events",
          () async {
        final TestLoggingInterface secondaryInterface =
            TestLoggingInterface("secondary");

        Arcane.logger.interceptors.add(
          LogInterceptor((event, context) {
            event.metadata?["mutatedBy"] =
                (context.interface as TestLoggingInterface).name;
            return event;
          }),
          matcher: (LoggingInterface interface) =>
              interface is TestLoggingInterface,
        );
        await Arcane.logger.registerInterface(
          secondaryInterface,
        );

        Arcane.log(
          logMessage,
          metadata: {"test": "value"},
        );

        expect(myInterface.events.single.metadata?["mutatedBy"], "primary");
        expect(
          secondaryInterface.events.single.metadata?["mutatedBy"],
          "secondary",
        );
      });

      test("unregistering an interface clears registration interceptors",
          () async {
        final TestLoggingInterface secondaryInterface =
            TestLoggingInterface("secondary");

        await Arcane.logger.unregisterInterface(myInterface);
        myInterface = TestLoggingInterface("primary-with-drop");
        await Arcane.logger.registerInterface(
          myInterface,
          interceptors: [
            LogInterceptor((event, context) => null),
          ],
        );

        await Arcane.logger.unregisterInterface(myInterface);
        await Arcane.logger.registerInterface(secondaryInterface);

        Arcane.log(logMessage);

        expect(myInterface.events, isEmpty);
        expect(secondaryInterface.events.single.message, logMessage);
      });

      test("reset clears global interceptors", () async {
        Arcane.logger.interceptors.add(prefixInterceptor);
        Arcane.logger.reset();
        await Arcane.logger.registerInterface(myInterface);

        Arcane.log(logMessage);

        expect(myInterface.events.single.message, logMessage);
      });

      test("global and type-scoped duplicate registrations are additive",
          () async {
        final LogInterceptor duplicateInterceptor = LogInterceptor(
          (event, context) {
            final int count = (event.metadata?["count"] as int?) ?? 0;
            return event.copyWith(
              metadata: {
                ...?event.metadata,
                "count": count + 1,
              },
            );
          },
        );

        Arcane.logger
          ..interceptors.add(duplicateInterceptor)
          ..interceptors.add(
            duplicateInterceptor,
            matcher: (LoggingInterface interface) =>
                interface is TestLoggingInterface,
          );

        Arcane.log(
          logMessage,
          metadata: {
            "count": 0,
          },
        );

        expect(myInterface.events.single.metadata?["count"], 2);
      });

      test(
          "interceptor collection clear removes global and scoped interceptors",
          () async {
        Arcane.logger.interceptors.add(prefixInterceptor);
        Arcane.logger.interceptors.add(
          LogInterceptor((event, context) {
            return event.copyWith(message: "[scoped] ${event.message}");
          }),
          matcher: (LoggingInterface interface) =>
              interface is TestLoggingInterface,
        );

        Arcane.logger.interceptors.clear();
        Arcane.log(logMessage);

        expect(myInterface.events.single.message, logMessage);
      });
    });
  });

  test("LoggerName mixin exposes name at runtime", () {
    expect(loggerWithLoggerName.name, "test-logger");

    loggerWithLoggerName.log("Test message");
    expect(loggerWithLoggerName.events.length, 1);
    expect(loggerWithLoggerName.events.first.message, "Test message");
  });
}