Update llama dependency and adapt loader to new version.

Add external configuration properties for the model.
Include date and time display on chat messages.

pom.xml

@@ -39,7 +39,7 @@
         <dependency>
             <groupId>de.kherud</groupId>
             <artifactId>llama</artifactId>
-            <version>3.4.1</version>
+            <version>4.2.0</version>
         </dependency>
 
         <!-- Test support -->

src/main/java/com/pablotj/ia/chat/boot/adapter/controller/ChatRestController.java

@@ -3,6 +3,7 @@ package com.pablotj.ia.chat.boot.adapter.controller;
 import com.pablotj.ia.chat.boot.application.usecase.ChatUseCase;
 import com.pablotj.ia.chat.boot.domain.model.ChatMessage;
 import jakarta.servlet.http.HttpSession;
+import java.util.Date;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.springframework.http.ResponseEntity;
@@ -30,7 +31,7 @@ public class ChatRestController {
             reply = chatUseCase.processUserPrompt(prompt, session);
         } catch (Exception e) {
             LOGGER.error(e.getMessage(), e);
-            reply = new ChatMessage("bot", e.getMessage());
+            reply = new ChatMessage("bot", e.getMessage(), new Date());
         }
         return ResponseEntity.ok(reply);
     }

src/main/java/com/pablotj/ia/chat/boot/application/usecase/ChatUseCase.java

@@ -7,6 +7,7 @@ import com.pablotj.ia.chat.boot.domain.service.ChatService;
 import com.pablotj.ia.chat.boot.infraestructure.llm.LlmModelClient;
 import com.pablotj.ia.chat.boot.web.session.ChatSessionManager;
 import jakarta.servlet.http.HttpSession;
+import java.util.Date;
 import java.util.List;
 import org.springframework.stereotype.Component;
 
@@ -27,7 +28,7 @@ public class ChatUseCase {
 
     public ChatMessage processUserPrompt(String prompt, HttpSession session) {
         List<ChatMessage> messages = sessionManager.getMessages(session);
-        messages.add(new ChatMessage(ATTR_ROLE_USER, prompt));
+        messages.add(new ChatMessage(ATTR_ROLE_USER, prompt, new Date()));
 
         PromptBuilder builder = new PromptBuilder(PromptTemplates.getDefault());
 
@@ -40,7 +41,7 @@ public class ChatUseCase {
         }
 
         String result = llmModelClient.generate(builder.build());
-        ChatMessage reply = new ChatMessage(ATTR_ROLE_BOT, result);
+        ChatMessage reply = new ChatMessage(ATTR_ROLE_BOT, result, new Date());
         messages.add(reply);
         sessionManager.setMessages(session, messages);
         return reply;

src/main/java/com/pablotj/ia/chat/boot/domain/model/ChatMessage.java

@@ -1,6 +1,14 @@
 package com.pablotj.ia.chat.boot.domain.model;
 
+import com.fasterxml.jackson.annotation.JsonFormat;
 import java.io.Serializable;
+import java.util.Date;
 
-public record ChatMessage(String role, String text) implements Serializable {
+public record ChatMessage(String role, String text, Date date) implements Serializable {
+
+    @Override
+    @JsonFormat(pattern = "dd/MM/yyyy HH:mm", timezone = "Europe/Madrid")
+    public Date date() {
+        return date;
+    }
 }

src/main/java/com/pablotj/ia/chat/boot/infraestructure/llm/LlmModelLoader.java

@@ -10,23 +10,30 @@ import org.springframework.stereotype.Component;
 @Component
 public class LlmModelLoader implements AutoCloseable {
 
-    @Value(value = "${model.gguf.name}")
+    @Value(value = "${llama.model.name}")
     private String modelName;
 
+    @Value(value = "${llama.model.gpu.enabled}")
+    private boolean gpuEnabled;
+
+    @Value(value = "${llama.model.gpu.layers}")
+    private int gpuLayers;
+
+    @Value(value = "${llama.model.tokens}")
+    private int tokens;
+
     private LlamaModel model;
 
     @PostConstruct
     public void init() {
         try {
             ModelParameters params = new ModelParameters()
-                    .setModelFilePath(String.format("models/%s.gguf", modelName))
+                    .setModel(String.format("models/%s.gguf", modelName))
                     .setSeed(42)
-                    .setNThreads(8)
-                    .setNGpuLayers(0)
-                    .setMainGpu(-1)
-                    .setNoKvOffload(true)
-                    .setUseMmap(true)
-                    .setNPredict(1024);
+                    .setThreads(8)
+                    .setMainGpu(gpuEnabled ? 0 : -1)
+                    .setGpuLayers(gpuEnabled ? gpuLayers : -1)
+                    .setPredict(tokens);
             model = new LlamaModel(params);
         } catch (Exception e) {
             throw new BusinessLogicException("Error loading model", e);

src/main/resources/application.properties

@@ -2,4 +2,8 @@ spring.application.name = ia-chat-boot
 server.port             = 8080
 
 ! Model
-model.gguf.name         = openchat-3.5-0106.Q4_K_M
+llama.model.name        = openchat-3.5-0106.Q4_K_M
+llama.model.gpu.enabled = true
+llama.model.gpu.layers  = 35
+llama.model.tokens      = 1024
+

src/main/resources/static/css/styles.css

@@ -1,126 +1,169 @@
+/* Base y fuente */
 html, body {
     margin: 0;
     padding: 0;
     height: 100%;
-    background: #121212;
-    color: #eee;
-    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+    background: #121217;
+    color: #e0e4e8;
+    font-family: 'Segoe UI Variable', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
 }
+
 body {
     display: flex;
     flex-direction: column;
     max-width: 600px;
-    margin-left: auto;
-    margin-right: auto;
+    margin: 0 auto;
     height: 100vh;
-    padding: 2rem 1rem 1rem 1rem; /* poco padding para el top, nada abajo */
+    padding: 2rem 1.25rem 1rem;
     box-sizing: border-box;
+    background-color: #121217;
 }
 
+/* Título */
 h1 {
     text-align: center;
-    margin: 0 0 1rem 0;
-    color: #61dafb;
+    margin-bottom: 1.25rem;
+    color: #5a90ff;
+    font-weight: 700;
+    font-size: 1.75rem;
+    letter-spacing: 0.05em;
     user-select: none;
-    flex-shrink: 0;
 }
 
+/* Contenedor de mensajes */
 #chat-log {
     flex: 1 1 auto;
     overflow-y: auto;
     display: flex;
     flex-direction: column;
-    gap: 10px;
-    padding: 1rem;
-    scrollbar-width: thin;
-    scrollbar-color: #61dafb transparent;
+    gap: 12px;
+    padding: 1.25rem 1.5rem;
     box-sizing: border-box;
+    background-color: #1a1c22;
+    border-radius: 16px;
+    scrollbar-width: thin;
+    scrollbar-color: #5a90ff33 transparent;
 }
 
 #chat-log::-webkit-scrollbar {
-    width: 8px;
+    width: 6px;
 }
 #chat-log::-webkit-scrollbar-thumb {
-    background-color: #61dafb;
-    border-radius: 4px;
+    background-color: #5a90ff55;
+    border-radius: 3px;
 }
 
+/* Burbujas comunes */
 .bubble {
     max-width: 75%;
-    padding: 12px 18px;
+    padding: 14px 18px;
     border-radius: 20px;
-    line-height: 1.4;
+    line-height: 1.5;
     font-size: 1rem;
     word-wrap: break-word;
     user-select: text;
+    transition: background-color 0.3s ease, color 0.3s ease;
+    opacity: 0;
+    transform: translateY(10px);
+    animation: slideFadeIn 0.3s forwards;
 }
 
+/* Animación de entrada */
+@keyframes slideFadeIn {
+    to {
+        opacity: 1;
+        transform: translateY(0);
+    }
+}
+
+/* Burbuja del usuario */
 .user {
-    background: linear-gradient(135deg, #6e91f6, #3a64f8);
+    background-color: #3451d1;
     align-self: flex-end;
-    color: white;
-    box-shadow: 0 2px 8px rgba(58, 100, 248, 0.5);
+    color: #ffffff;
+    border-radius: 20px 20px 4px 20px;
 }
 
+/* Burbuja del bot */
 .bot {
-    background: linear-gradient(135deg, #444, #222);
+    background-color: #2a2d35;
     align-self: flex-start;
-    color: #61dafb;
+    color: #a4c8ff;
     font-style: italic;
-    box-shadow: 0 2px 8px rgba(97, 218, 251, 0.5);
+    border-radius: 20px 20px 20px 4px;
 }
 
+/* Formulario de entrada */
 form {
-    flex-shrink: 0; /* que no se encoja */
-    margin-top: 1rem;
+    flex-shrink: 0;
+    margin-top: 1.25rem;
     display: flex;
-    gap: 8px;
-    padding: 0 1rem;
+    gap: 12px;
+    padding: 0;
     box-sizing: border-box;
+    background: transparent;
+    border-radius: 0;
 }
 
+/* Textarea */
 textarea {
     flex-grow: 1;
-    min-height: 4rem;
-    border-radius: 12px;
-    border: none;
-    padding: 0.75rem 1rem;
+    min-height: 4.25rem;
+    border-radius: 16px;
+    border: 1px solid #2d2f36;
+    padding: 1rem 1.25rem;
     font-size: 1rem;
     resize: none;
     outline: none;
-    background-color: #222;
-    color: #eee;
-    box-shadow: inset 0 0 5px #000;
+    background-color: #1c1e24;
+    color: #e6e9ef;
     font-family: inherit;
     max-width: 100%;
     overflow-y: auto;
     box-sizing: border-box;
+    transition: border-color 0.25s ease, background-color 0.25s ease;
+}
+
+textarea::placeholder {
+    color: #6a6e7c;
+    font-style: italic;
+    opacity: 0.9;
 }
 
 textarea:focus {
-    box-shadow: inset 0 0 7px #61dafb;
+    border-color: #5a90ff;
+    background-color: #20232a;
 }
 
+/* Botón */
 button {
-    background: #61dafb;
+    background-color: #5a90ff;
     border: none;
-    border-radius: 12px;
-    color: #121212;
-    padding: 0 1.5rem;
-    font-weight: 700;
+    border-radius: 14px;
+    color: #ffffff;
+    padding: 0 1.75rem;
+    font-weight: 600;
     font-size: 1rem;
     cursor: pointer;
-    transition: background-color 0.3s ease;
+    transition: background-color 0.25s ease, transform 0.1s ease;
     white-space: nowrap;
 }
 
 button:hover:not(:disabled) {
-    background-color: #4ea8e6;
+    background-color: #4076e0;
+}
+
+button:active:not(:disabled) {
+    transform: translateY(1px);
+    background-color: #305dc0;
 }
 
 button:disabled {
-    opacity: 0.6;
+    opacity: 0.5;
     cursor: not-allowed;
+    background-color: #3a4a6a;
 }
 
 #spinner {
@@ -128,21 +171,64 @@ button:disabled {
     margin: 1rem auto;
     width: 36px;
     height: 36px;
-    border: 4px solid rgba(97, 218, 251, 0.3);
-    border-top-color: #61dafb;
+    border: 4px solid rgba(90, 144, 255, 0.2);
+    border-top-color: #5a90ff;
     border-radius: 50%;
     animation: spin 1s linear infinite;
 }
 
 @keyframes spin {
-    to { transform: rotate(360deg); }
+    to {
+        transform: rotate(360deg);
+    }
 }
 
+/* Texto "Pensando..." */
 #thinking-text {
     text-align: center;
-    color: #61dafb;
+    color: #5a90ff;
     font-style: italic;
     margin-top: 0.5rem;
     font-weight: 600;
     display: none;
+    user-select: none;
+}
+
+.timestamp {
+    display: block;
+    text-align: right;
+    font-size: 0.75rem;
+    color: #999;
+    margin-top: 6px;
+    font-style: normal;
+    opacity: 0.7;
+    user-select: none;
+}
+
+/* Responsive */
+@media (max-width: 480px) {
+    body {
+        max-width: 100%;
+        padding: 1.5rem 1rem 1rem;
+    }
+
+    #chat-log {
+        padding: 1rem 1.25rem;
+        border-radius: 12px;
+    }
+
+    form {
+        gap: 8px;
+    }
+
+    textarea {
+        min-height: 3.5rem;
+        font-size: 0.95rem;
+        padding: 0.75rem 1rem;
+    }
+
+    button {
+        padding: 0 1.25rem;
+        font-size: 0.95rem;
+    }
 }

src/main/resources/static/js/main.js

@@ -6,11 +6,15 @@ document.addEventListener("DOMContentLoaded", () => {
     const spinner = document.getElementById('spinner');
     const thinkingText = document.getElementById('thinking-text');
 
-    function appendMessage(role, text) {
+    function appendMessage(role, text, date) {
         const bubble = document.createElement('div');
         bubble.className = `bubble ${role}`;
         bubble.textContent = text;
         chatLog.appendChild(bubble);
+        const timestamp = document.createElement('em');
+        timestamp.className = 'timestamp';
+        timestamp.textContent = date;
+        bubble.appendChild(timestamp);
         chatLog.scrollTop = chatLog.scrollHeight;
     }
 
@@ -20,7 +24,7 @@ document.addEventListener("DOMContentLoaded", () => {
         const prompt = promptInput.value.trim();
         if (!prompt) return;
 
-        appendMessage("user", prompt);
+        appendMessage("user", prompt, formatDate(new Date()));
         promptInput.value = "";
         sendBtn.disabled = true;
         spinner.style.display = 'block';
@@ -36,7 +40,7 @@ document.addEventListener("DOMContentLoaded", () => {
             });
 
             const data = await response.json();
-            appendMessage("bot", data.text);
+            appendMessage("bot", data.text, data.date);
         } catch (error) {
             appendMessage("bot", "❌ Error procesando la respuesta.");
             console.error(error);
@@ -46,4 +50,14 @@ document.addEventListener("DOMContentLoaded", () => {
             thinkingText.style.display = 'none';
         }
     });
+
+    function formatDate(date) {
+        const day = date.getDate().toString().padStart(2, '0');
+        const month = (date.getMonth() + 1).toString().padStart(2, '0'); // Enero = 0
+        const year = date.getFullYear();
+        const hours = date.getHours().toString().padStart(2, '0');
+        const minutes = date.getMinutes().toString().padStart(2, '0');
+
+        return `${day}/${month}/${year} ${hours}:${minutes}`;
+    }
 });

src/main/resources/templates/chat.html

@@ -9,7 +9,11 @@
 <h1>🤖 Chat IA Offline</h1>
 
 <div id="chat-log">
-    <div th:each="msg : ${messages}" th:class="'bubble ' + ${msg.role}" th:text="${msg.text}"></div>
+    <div th:each="msg : ${messages}"
+         th:class="'bubble ' + ${msg.role}">
+        <span th:text="${msg.text}"></span>
+        <em class="timestamp" th:text="${#dates.format(msg.date, 'dd/MM/yyyy HH:mm')}"></em>
+    </div>
 </div>
 <div id="spinner"></div>
 <div id="thinking-text">Pensando...</div>