import java.util.Iterator;
import java.util.List;
import java.util.stream.Stream;
import org.jspecify.annotations.Nullable;

/**
 * An accumulator that selects the "top" {@code k} elements added to it, relative to a provided
 * comparator. "Top" can mean the greatest or the lowest elements, specified in the factory used to
 * create the {@code TopKSelector} instance.
 *

        Exception level1 = new IOException("Level 1 error", level2);
        SsoLoginException exception = new SsoLoginException("Top level SSO error", level1);

        assertEquals("Top level SSO error", exception.getMessage());

        // Verify the exception chain
        Throwable cause1 = exception.getCause();
        assertNotNull(cause1);

        Throwable middleCause = new IllegalStateException("Middle cause", rootCause);
        ScheduledJobException exception = new ScheduledJobException("Top level error", middleCause);

        assertEquals("Top level error", exception.getMessage());
        assertEquals(middleCause, exception.getCause());
        assertEquals("Middle cause", exception.getCause().getMessage());

        RuntimeException middleCause = new RuntimeException("Middle cause", rootCause);
        FessSystemException topException = new FessSystemException("Top level", middleCause);

        assertEquals("Top level", topException.getMessage());
        assertEquals(middleCause, topException.getCause());
        assertEquals(rootCause, topException.getCause().getCause());
    }

        Throwable intermediateCause = new RuntimeException("Intermediate problem", rootCause);
        GsaConfigException exception = new GsaConfigException("Top level GSA error", intermediateCause);

        assertNotNull(exception);
        assertEquals("Top level GSA error", exception.getMessage());

        // Check first level cause
        assertNotNull(exception.getCause());

        Exception intermediateCause = new IllegalStateException("Intermediate cause", rootCause);
        ScriptEngineException exception = new ScriptEngineException("Top level error", intermediateCause);

        assertEquals("Top level error", exception.getMessage());
        assertEquals(intermediateCause, exception.getCause());
        assertEquals("Intermediate cause", exception.getCause().getMessage());

        Exception middleCause = new IllegalStateException("Middle cause", rootCause);
        DataStoreException exception = new DataStoreException("Top level error", middleCause);

        assertNotNull(exception);
        assertEquals("Top level error", exception.getMessage());
        assertEquals(middleCause, exception.getCause());
        assertEquals(rootCause, exception.getCause().getCause());
    }

        // Test nested exception chain
        Exception rootCause = new IllegalStateException("Root cause");
        Exception middleCause = new RuntimeException("Middle cause", rootCause);
        String message = "Top level error";

        SearchQueryException exception = new SearchQueryException(message, middleCause);

        assertEquals(message, exception.getMessage());
        assertEquals(middleCause, exception.getCause());

        Exception rootCause = new IllegalStateException("Root cause");
        Exception middleCause = new RuntimeException("Middle cause", rootCause);
        String message = "Top level dictionary error";
        DictionaryException exception = new DictionaryException(message, middleCause);

        assertNotNull(exception);
        assertEquals(message, exception.getMessage());

        assertEquals("{labels.profile.placeholder_confirm_new_password}", FessLabels.LABELS_PROFILE_placeholder_confirm_new_password);

        // Test search related labels
        assertEquals("{labels.top.search}", FessLabels.LABELS_TOP_SEARCH);
        assertEquals("{labels.index_title}", FessLabels.LABELS_index_title);
        assertEquals("{labels.index_form_search_btn}", FessLabels.LABELS_index_form_search_btn);