feat: agent brain (ollama) and chat ui

src/App.tsx

@@ -1,7 +1,7 @@
 import { useState } from "react";
 import { invoke } from "@tauri-apps/api/core";
 import { open } from "@tauri-apps/plugin-dialog";
-import { ToolTester } from "./components/ToolTester";
+import { Chat } from "./components/Chat";
 import "./App.css";
 
 function App() {
@@ -62,8 +62,7 @@ function App() {
             <strong>Active Project:</strong> {projectPath}
           </div>
           <hr style={{ margin: "20px 0" }} />
-          <p>Project loaded successfully.</p>
-          <ToolTester />
+          <Chat />
         </div>
       )}
 

src/components/Chat.tsx

@@ -0,0 +1,126 @@
+import { useState, useRef, useEffect } from "react";
+import { invoke } from "@tauri-apps/api/core";
+import Markdown from "react-markdown";
+import { Message, ProviderConfig } from "../types";
+
+export function Chat() {
+  const [messages, setMessages] = useState<Message[]>([]);
+  const [input, setInput] = useState("");
+  const [loading, setLoading] = useState(false);
+  const [model, setModel] = useState("llama3.1"); // Default local model
+  const messagesEndRef = useRef<HTMLDivElement>(null);
+
+  const scrollToBottom = () => {
+    messagesEndRef.current?.scrollIntoView({ behavior: "smooth" });
+  };
+
+  useEffect(scrollToBottom, [messages]);
+
+  const sendMessage = async () => {
+    if (!input.trim() || loading) return;
+
+    const userMsg: Message = { role: "user", content: input };
+    const newHistory = [...messages, userMsg];
+    
+    setMessages(newHistory);
+    setInput("");
+    setLoading(true);
+
+    try {
+      const config: ProviderConfig = {
+        provider: "ollama",
+        model: model,
+        base_url: "http://localhost:11434",
+      };
+
+      // Invoke backend chat command
+      // The backend returns the *new* messages (assistant response + tool outputs)
+      const response = await invoke<Message[]>("chat", {
+        messages: newHistory,
+        config: config,
+      });
+
+      setMessages((prev) => [...prev, ...response]);
+    } catch (e) {
+      console.error(e);
+      setMessages((prev) => [
+        ...prev,
+        { role: "assistant", content: `**Error:** ${e}` },
+      ]);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="chat-container" style={{ display: "flex", flexDirection: "column", height: "100%", maxWidth: "800px", margin: "0 auto" }}>
+      {/* Settings Bar */}
+      <div style={{ padding: "10px", borderBottom: "1px solid #ddd", display: "flex", gap: "10px", alignItems: "center" }}>
+        <label>Ollama Model:</label>
+        <input 
+          value={model} 
+          onChange={(e) => setModel(e.target.value)} 
+          placeholder="e.g. llama3, mistral"
+          style={{ padding: "5px" }}
+        />
+      </div>
+
+      {/* Messages Area */}
+      <div style={{ flex: 1, overflowY: "auto", padding: "20px", display: "flex", flexDirection: "column", gap: "15px" }}>
+        {messages.map((msg, idx) => (
+          <div 
+            key={idx} 
+            className={`message ${msg.role}`}
+            style={{
+              alignSelf: msg.role === "user" ? "flex-end" : "flex-start",
+              maxWidth: "80%",
+              padding: "10px 15px",
+              borderRadius: "10px",
+              background: msg.role === "user" ? "#007AFF" : msg.role === "tool" ? "#f0f0f0" : "#E5E5EA",
+              color: msg.role === "user" ? "white" : "black",
+              border: msg.role === "tool" ? "1px solid #ccc" : "none",
+              fontFamily: msg.role === "tool" ? "monospace" : "inherit",
+              fontSize: msg.role === "tool" ? "0.9em" : "1em",
+              whiteSpace: msg.role === "tool" ? "pre-wrap" : "normal"
+            }}
+          >
+            <strong>{msg.role === "user" ? "You" : msg.role === "tool" ? "Tool Output" : "Agent"}</strong>
+            {msg.role === "tool" ? (
+               <div style={{maxHeight: "200px", overflow: "auto"}}>{msg.content}</div>
+            ) : (
+              <Markdown>{msg.content}</Markdown>
+            )}
+            
+            {/* Show Tool Calls if present */}
+            {msg.tool_calls && (
+              <div style={{ marginTop: "10px", fontSize: "0.85em", color: "#666" }}>
+                {msg.tool_calls.map((tc, i) => (
+                  <div key={i} style={{ background: "rgba(0,0,0,0.05)", padding: "5px", borderRadius: "4px" }}>
+                    🛠 <code>{tc.function.name}({tc.function.arguments})</code>
+                  </div>
+                ))}
+              </div>
+            )}
+          </div>
+        ))}
+        {loading && <div style={{ alignSelf: "flex-start", color: "#888" }}>Thinking...</div>}
+        <div ref={messagesEndRef} />
+      </div>
+
+      {/* Input Area */}
+      <div style={{ padding: "20px", borderTop: "1px solid #ddd", display: "flex", gap: "10px" }}>
+        <input
+          value={input}
+          onChange={(e) => setInput(e.target.value)}
+          onKeyDown={(e) => e.key === "Enter" && sendMessage()}
+          placeholder="Ask the agent to do something..."
+          style={{ flex: 1, padding: "10px", borderRadius: "4px", border: "1px solid #ccc" }}
+          disabled={loading}
+        />
+        <button onClick={sendMessage} disabled={loading} style={{ padding: "10px 20px" }}>
+          Send
+        </button>
+      </div>
+    </div>
+  );
+}

src/types.ts

@@ -13,3 +13,27 @@ export interface CommandOutput {
   stderr: string;
   exit_code: number;
 }
+
+export type Role = "system" | "user" | "assistant" | "tool";
+
+export interface ToolCall {
+  id?: string;
+  type: string;
+  function: {
+    name: string;
+    arguments: string;
+  };
+}
+
+export interface Message {
+  role: Role;
+  content: string;
+  tool_calls?: ToolCall[];
+  tool_call_id?: string;
+}
+
+export interface ProviderConfig {
+  provider: string;
+  model: string;
+  base_url?: string;
+}