feat(api): integrate MCP tools support in Ollama chat route

Add support for Model Context Protocol (MCP) tools in the Ollama chat API. Detect model capabilities to use native tools or prompt engineering. Handle tool calls, execute them via MCPExecutor, and inject results back into the conversation for seamless tool-assisted responses. This enhances chat functionality by enabling external tool integration.

components/chat/ChatContainer.tsx

@@ -1,10 +1,11 @@
 "use client";
 
-import { useState, useEffect, useRef } from "react";
+import { useState, useEffect, useRef, useCallback } from "react";
 import { ModelDropdown } from "@/components/model/ModelDropdown";
 import { ModelPullDialog } from "@/components/model/ModelPullDialog";
 import { ChatMessage } from "@/components/chat/ChatMessage";
 import { SettingsModal } from "@/components/chat/SettingsModal";
+import { MCPSelector, ActiveMCPBadges } from "@/components/chat/MCPSelector";
 import { Send, Square } from "lucide-react";
 import type { ModelInfo } from "@/lib/models";
 import type { Message } from "@/lib/chat";
@@ -37,6 +38,10 @@ export function ChatContainer({
   const [systemPrompt, setSystemPrompt] = useState<string>("");
   const messagesEndRef = useRef<HTMLDivElement>(null);
 
+  // Estado para MCPs ativos
+  const [activeMcps, setActiveMcps] = useState<string[]>([]);
+  const [mcpNames, setMcpNames] = useState<Map<string, string>>(new Map());
+
   // Carregar modelo salvo ao iniciar
   useEffect(() => {
     if (ready && prefs.selectedModel && !selectedModel) {
@@ -61,6 +66,69 @@ export function ChatContainer({
     update({ selectedModel: modelName }); // Salvar no Redis
   };
 
+  // Carregar MCPs ativos do localStorage
+  useEffect(() => {
+    const saved = localStorage.getItem("ollahub-active-mcps");
+    if (saved) {
+      try {
+        const parsed = JSON.parse(saved);
+        setActiveMcps(parsed.mcps || []);
+        setMcpNames(new Map(parsed.names || []));
+      } catch (e) {
+        console.error("Error loading active MCPs:", e);
+      }
+    }
+  }, []);
+
+  // Salvar MCPs ativos no localStorage quando mudarem
+  useEffect(() => {
+    if (activeMcps.length > 0 || mcpNames.size > 0) {
+      localStorage.setItem(
+        "ollahub-active-mcps",
+        JSON.stringify({
+          mcps: activeMcps,
+          names: Array.from(mcpNames.entries()),
+        })
+      );
+    }
+  }, [activeMcps, mcpNames]);
+
+  // Handlers para MCP Selector
+  const handleToggleMCP = useCallback(
+    async (mcpId: string) => {
+      setActiveMcps((prev) => {
+        if (prev.includes(mcpId)) {
+          return prev.filter((id) => id !== mcpId);
+        } else {
+          // Buscar nome do MCP se ainda não temos
+          if (!mcpNames.has(mcpId)) {
+            fetch("/api/mcp/available-for-chat")
+              .then((res) => res.json())
+              .then((data) => {
+                if (data.success) {
+                  const mcp = data.mcps.find((m: any) => m.mcpId === mcpId);
+                  if (mcp) {
+                    setMcpNames((prev) => new Map(prev).set(mcpId, mcp.name));
+                  }
+                }
+              })
+              .catch(console.error);
+          }
+          return [...prev, mcpId];
+        }
+      });
+    },
+    [mcpNames]
+  );
+
+  const handleClearAllMCPs = useCallback(() => {
+    setActiveMcps([]);
+  }, []);
+
+  const handleRemoveMCP = useCallback((mcpId: string) => {
+    setActiveMcps((prev) => prev.filter((id) => id !== mcpId));
+  }, []);
+
   const scrollToBottom = () => {
     messagesEndRef.current?.scrollIntoView({ behavior: "smooth" });
   };
@@ -159,6 +227,7 @@ export function ChatContainer({
           messages: messagesToSend,
           options,
           system: systemPrompt || undefined,
+          activeMcps: activeMcps.length > 0 ? activeMcps : undefined,
         }),
         signal: abortRef.current.signal,
       });
@@ -187,6 +256,21 @@ export function ChatContainer({
 
           try {
             const data = JSON.parse(line);
+
+            // Tool execution indicator
+            if (data.toolExecution) {
+              console.log(
+                `🔧 MCP Tool executed: ${data.toolExecution.mcpId}.${data.toolExecution.toolName}`
+              );
+              // Opcional: Mostrar indicador visual
+            }
+
+            // Clear previous response (para prompt engineering)
+            if (data.clearPrevious) {
+              assistantContent = "";
+              setStreamingContent("");
+            }
+
             if (data.token) {
               assistantContent += data.token;
               setStreamingContent(assistantContent);
@@ -411,7 +495,21 @@ export function ChatContainer({
       {/* Input */}
       <div className="flex-shrink-0 border-t border-[var(--border)] bg-[var(--background)]">
         <form onSubmit={handleSubmit} className="p-4">
+          {/* Active MCP Badges */}
+          <ActiveMCPBadges
+            activeMcps={activeMcps}
+            mcpNames={mcpNames}
+            onRemove={handleRemoveMCP}
+          />
+
           <div className="flex gap-2">
+            {/* MCP Selector */}
+            <MCPSelector
+              activeMcps={activeMcps}
+              onToggleMCP={handleToggleMCP}
+              onClearAll={handleClearAllMCPs}
+            />
+
             <textarea
               value={inputContent}
               onChange={(e) => setInputContent(e.target.value)}