final LlmMessage message = new LlmMessage();
        assertNull(message.getRole());
        assertNull(message.getContent());
    }

    @Test
    public void test_constructorWithRoleAndContent() {
        final LlmMessage message = new LlmMessage("system", "You are a helpful assistant.");
        assertEquals("system", message.getRole());
        assertEquals("You are a helpful assistant.", message.getContent());
    }

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.api.admin.role;

import static org.codelibs.fess.app.web.admin.role.AdminRoleAction.getRole;

import java.util.List;
import java.util.stream.Collectors;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.fess.app.pager.RolePager;

        assertSame(request, result);
        assertEquals(1, request.getMessages().size());
        assertEquals(LlmMessage.ROLE_SYSTEM, request.getMessages().get(0).getRole());
        assertEquals("System prompt", request.getMessages().get(0).getContent());
    }

    @Test
    public void test_addUserMessage() {
        final LlmChatRequest request = new LlmChatRequest();

        assertEquals("user", message.getRole());
        assertEquals("Hello", message.getContent());
        assertNotNull(message.getTimestamp());
        assertNotNull(message.getSources());
    }

    @Test
    public void test_userMessage() {
        final ChatMessage message = ChatMessage.userMessage("Hello, World!");
        assertEquals(ChatMessage.ROLE_USER, message.getRole());

        return roleList;
    }

    /**
     * Gets a role by its ID.
     * @param id The ID of the role.
     * @return An optional entity of the role.
     */
    public OptionalEntity<Role> getRole(final String id) {
        return roleBhv.selectByPK(id);
    }

    /**
     * Stores a role.
     * @param role The role to store.
     */
    public void store(final Role role) {

                // Ensure trimmed history starts with a user message, not an assistant message
                if (start < messages.size() && ChatMessage.ROLE_ASSISTANT.equals(messages.get(start).getRole())) {
                    start = Math.max(0, start - 1);
                }
                final List<ChatMessage> trimmed = new ArrayList<>(messages.subList(start, messages.size()));
                messages.clear();

        return new LlmMessage(ROLE_ASSISTANT, content);
    }

    /**
     * Gets the message role.
     *
     * @return the role
     */
    public String getRole() {
        return role;
    }

    /**
     * Sets the message role.
     *
     * @param role the role
     */
    public void setRole(final String role) {
        this.role = role;
    }