* @return a new user message
     */
    public static ChatMessage userMessage(final String content) {
        return new ChatMessage(ROLE_USER, content);
    }

    /**
     * Creates an assistant message with the specified content.
     *
     * @param content the message content
     * @return a new assistant message
     */
    public static ChatMessage assistantMessage(final String content) {

     */
    public void addUserMessage(final String content) {
        addMessage(ChatMessage.userMessage(content));
    }

    /**
     * Adds an assistant message to this session.
     *
     * @param content the message content
     */
    public void addAssistantMessage(final String content) {
        addMessage(ChatMessage.assistantMessage(content));
    }

    /**

    }

    @Test
    public void test_isUser() {
        final ChatMessage userMessage = new ChatMessage(ChatMessage.ROLE_USER, "test");
        final ChatMessage assistantMessage = new ChatMessage(ChatMessage.ROLE_ASSISTANT, "test");
        final ChatMessage unknownMessage = new ChatMessage("unknown", "test");

        assertTrue(userMessage.isUser());
        assertFalse(assistantMessage.isUser());

        final ChatMessage msg = ChatMessage.assistantMessage("Full response text here.");
        final String result = chatClient.testBuildAssistantHistoryContent(msg, "full", 500, 500);
        assertEquals("Full response text here.", result);
    }

    @Test
    public void test_buildAssistantHistoryContent_none() {
        final ChatMessage msg = ChatMessage.assistantMessage("Any content");

import java.util.stream.Collectors;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.fess.entity.ChatMessage;
import org.codelibs.fess.entity.ChatMessage.ChatSource;
import org.codelibs.fess.entity.ChatSession;
import org.codelibs.fess.entity.FacetInfo;
import org.codelibs.fess.entity.GeoInfo;
import org.codelibs.fess.entity.HighlightInfo;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.timer.TimeoutManager;
import org.codelibs.core.timer.TimeoutTask;
import org.codelibs.fess.entity.ChatMessage;
import org.codelibs.fess.entity.ChatSession;
import org.codelibs.fess.util.ComponentUtil;

import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;

/**
 * Manager class for chat sessions.

import org.codelibs.fess.Constants;
import org.codelibs.fess.api.BaseApiManager;
import org.codelibs.fess.chat.ChatClient.ChatResult;
import org.codelibs.fess.chat.ChatPhaseCallback;
import org.codelibs.fess.entity.ChatMessage.ChatSource;
import org.codelibs.fess.entity.FacetQueryView;
import org.codelibs.fess.entity.SearchRequestParams;
import org.codelibs.fess.helper.SystemHelper;
import org.codelibs.fess.llm.LlmException;

import java.io.StringWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.codelibs.fess.Constants;
import org.codelibs.fess.entity.ChatMessage.ChatSource;
import org.codelibs.fess.entity.FacetQueryView;
import org.codelibs.fess.helper.ViewHelper;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.unit.UnitFessTestCase;