refactor using Cursor

frontend/src/components/ChatWindow.jsx

@@ -1,69 +1,106 @@
-import React from "react";
+import React, { memo, useCallback } from "react";
 import LLMResponse from "./LLMResponse";
 import MessageBubble from "./MessageBubble";
 import LoadingIndicator from "./LoadingIndicator";
 
-function safeParse(str) {
-  try {
-    return JSON.parse(str);
-  } catch (err) {
-    console.error("safeParse error:", err, "Original string:", str);
-    return {};
-  }
+class ChatErrorBoundary extends React.Component {
+    constructor(props) {
+        super(props);
+        this.state = { hasError: false };
+    }
+
+    static getDerivedStateFromError(error) {
+        return { hasError: true };
+    }
+
+    componentDidCatch(error, errorInfo) {
+        console.error("ChatWindow error:", error, errorInfo);
+    }
+
+    render() {
+        if (this.state.hasError) {
+            return (
+                <div className="text-red-500 p-4 text-center">
+                    Something went wrong. Please refresh the page.
+                </div>
+            );
+        }
+        return this.props.children;
+    }
 }
 
-export default function ChatWindow({ conversation, loading, onConfirm }) {
+const safeParse = (str) => {
+    try {
+        return typeof str === 'string' ? JSON.parse(str) : str;
+    } catch (err) {
+        console.error("safeParse error:", err, "Original string:", str);
+        return str;
+    }
+};
 
-  if (!Array.isArray(conversation)) {
-    console.error("ChatWindow expected conversation to be an array, got:", conversation);
-    return null;
-  }
-
-  const filtered = conversation.filter((msg) => {
+const Message = memo(({ msg, idx, isLastMessage, onConfirm, onContentChange }) => {
     const { actor, response } = msg;
-
+    
     if (actor === "user") {
-      return true;
+        return <MessageBubble message={{ response }} isUser />;
     }
+    
     if (actor === "agent") {
-      const parsed = typeof response === "string" ? safeParse(response) : response;
-      return true; // Adjust this logic based on your "next" field.
-    }
-    return false;
-  });
-
-  return (
-    <div className="flex-grow flex flex-col">
-      {/* Main message container */}
-      <div className="flex-grow flex flex-col justify-end overflow-y-auto space-y-3">
-        {filtered.map((msg, idx) => {
-          const { actor, response } = msg;
-  
-          if (actor === "user") {
-            return <MessageBubble key={idx} message={{ response }} isUser />;
-          } else if (actor === "agent") {
-            const data =
-              typeof response === "string" ? safeParse(response) : response;
-            const isLastMessage = idx === filtered.length - 1;
-            return (
-              <LLMResponse
-                key={idx}
+        const data = safeParse(response);
+        return (
+            <LLMResponse
                 data={data}
                 onConfirm={onConfirm}
                 isLastMessage={isLastMessage}
-              />
-            );
-          }
-          return null; // Fallback for unsupported actors.
-        })}
-        {/* Loading indicator */}
-        {loading && (
-          <div className="pt-2 flex justify-center">
-            <LoadingIndicator />
-          </div>
-        )}
-      </div>
-    </div>
-  );
-  
-}
+                onHeightChange={onContentChange}
+            />
+        );
+    }
+    
+    return null;
+});
+
+Message.displayName = 'Message';
+
+const ChatWindow = memo(({ conversation, loading, onConfirm, onContentChange }) => {
+    const validateConversation = useCallback((conv) => {
+        if (!Array.isArray(conv)) {
+            console.error("ChatWindow expected conversation to be an array, got:", conv);
+            return [];
+        }
+        return conv;
+    }, []);
+
+    const filtered = validateConversation(conversation).filter((msg) => {
+        const { actor } = msg;
+        return actor === "user" || actor === "agent";
+    });
+
+    return (
+        <ChatErrorBoundary>
+            <div className="flex-grow flex flex-col">
+                <div className="flex-grow flex flex-col justify-end overflow-y-auto space-y-3">
+                    {filtered.map((msg, idx) => (
+                        <Message
+                            key={`${msg.actor}-${idx}-${typeof msg.response === 'string' ? msg.response : msg.response?.response}`}
+                            msg={msg}
+                            idx={idx}
+                            isLastMessage={idx === filtered.length - 1}
+                            onConfirm={onConfirm}
+                            onContentChange={onContentChange}
+                        />
+                    ))}
+                    {loading && (
+                        <div className="pt-2 flex justify-center">
+                            <LoadingIndicator />
+                        </div>
+                    )}
+                </div>
+            </div>
+        </ChatErrorBoundary>
+    );
+});
+
+ChatWindow.displayName = 'ChatWindow';
+
+export default ChatWindow;

frontend/src/components/ConfirmInline.jsx

@@ -1,59 +1,65 @@
-import React from "react";
+import React, { memo } from "react";
 
-export default function ConfirmInline({ data, confirmed, onConfirm }) {
-  const { args, tool } = data || {};
+const ConfirmInline = memo(({ data, confirmed, onConfirm }) => {
+    const { args, tool } = data || {};
 
-  if (confirmed) {
-    // Once confirmed, show "Running..." state in the same container
-    return (
-      <div className="mt-2 p-2 border border-gray-400 dark:border-gray-600 rounded bg-gray-50 dark:bg-gray-800">
-        <div className="text-sm text-gray-600 dark:text-gray-300">
-          <div>
-            <strong>Tool:</strong> {tool ?? "Unknown"}
-          </div>
-          {args && (
+    const renderArgs = () => {
+        if (!args) return null;
+        
+        return (
             <div className="mt-1">
-              <strong>Args:</strong>
-              <pre className="bg-gray-100 dark:bg-gray-700 p-1 rounded text-sm whitespace-pre-wrap">
-                {JSON.stringify(args, null, 2)}
-              </pre>
+                <strong>Args:</strong>
+                <pre className="bg-gray-100 dark:bg-gray-700 p-1 rounded text-sm whitespace-pre-wrap overflow-x-auto">
+                    {JSON.stringify(args, null, 2)}
+                </pre>
             </div>
-          )}
-        </div>
-        <div className="mt-2 text-green-600 dark:text-green-400 font-medium">
-          Running {tool}...
-        </div>
-      </div>
-    );
-  }
+        );
+    };
 
-  // Not confirmed yet → show confirmation UI
-  return (
-    <div className="mt-2 p-2 border border-gray-400 dark:border-gray-600 rounded bg-gray-50 dark:bg-gray-800">
-      <div className="text-gray-600 dark:text-gray-300">
-        <div>
-          Agent is ready to run the tool: <strong>{tool ?? "Unknown"}</strong>
+    if (confirmed) {
+        return (
+            <div className="mt-2 p-2 border border-gray-400 dark:border-gray-600 rounded 
+                bg-gray-50 dark:bg-gray-800 transition-colors duration-200">
+                <div className="text-sm text-gray-600 dark:text-gray-300">
+                    <div>
+                        <strong>Tool:</strong> {tool ?? "Unknown"}
+                    </div>
+                    {renderArgs()}
+                </div>
+                <div className="mt-2 text-green-600 dark:text-green-400 font-medium">
+                    Running {tool}...
+                </div>
+            </div>
+        );
+    }
+
+    return (
+        <div className="mt-2 p-2 border border-gray-400 dark:border-gray-600 rounded 
+            bg-gray-50 dark:bg-gray-800 transition-colors duration-200">
+            <div className="text-gray-600 dark:text-gray-300">
+                <div>
+                    Agent is ready to run the tool: <strong>{tool ?? "Unknown"}</strong>
+                </div>
+                {renderArgs()}
+                <div className="mt-2 text-sm text-gray-500 dark:text-gray-400">
+                    Please confirm to proceed.
+                </div>
+            </div>
+            <div className="text-right mt-2">
+                <button
+                    onClick={onConfirm}
+                    className="bg-green-600 hover:bg-green-700 text-white px-3 py-1 rounded
+                        transition-colors duration-200 focus:outline-none focus:ring-2 
+                        focus:ring-green-500 focus:ring-opacity-50"
+                    aria-label={`Confirm running ${tool}`}
+                >
+                    Confirm
+                </button>
+            </div>
         </div>
-        {args && (
-          <div className="mt-1 text-sm">
-            With the following parameters
-            <pre className="bg-gray-100 dark:bg-gray-700 p-1 rounded text-sm whitespace-pre-wrap">
-              {JSON.stringify(args, null, 2)}
-            </pre>
-          </div>
-        )}
-        <div className="mt-2 text-sm text-gray-500 dark:text-gray-400">
-          Please confirm to proceed.
-        </div>
-      </div>
-      <div className="text-right mt-2">
-        <button
-          onClick={onConfirm}
-          className="bg-green-600 hover:bg-green-700 text-white px-3 py-1 rounded"
-        >
-          Confirm
-        </button>
-      </div>
-    </div>
-  );
-}
+    );
+});
+
+ConfirmInline.displayName = 'ConfirmInline';
+
+export default ConfirmInline;

frontend/src/components/LLMResponse.jsx

@@ -1,44 +1,60 @@
-import React, { useState } from "react";
+import React, { memo, useEffect } from "react";
 import MessageBubble from "./MessageBubble";
 import ConfirmInline from "./ConfirmInline";
 
-export default function LLMResponse({ data, onConfirm, isLastMessage }) {
-  const [isConfirmed, setIsConfirmed] = useState(false);
+const LLMResponse = memo(({ data, onConfirm, isLastMessage, onHeightChange }) => {
+    const [isConfirmed, setIsConfirmed] = React.useState(false);
+    const responseRef = React.useRef(null);
 
-  const handleConfirm = async () => {
-    if (onConfirm) await onConfirm();
-    setIsConfirmed(true);
-  };
+    // Notify parent of height changes when confirm UI appears/changes
+    useEffect(() => {
+        if (isLastMessage && responseRef.current && onHeightChange) {
+            onHeightChange();
+        }
+    }, [isLastMessage, isConfirmed, onHeightChange]);
 
-  // Only requires confirm if data.next === "confirm" AND it's the last message
-  const requiresConfirm = data.next === "confirm" && isLastMessage;
+    const handleConfirm = async () => {
+        try {
+            if (onConfirm) await onConfirm();
+            setIsConfirmed(true);
+        } catch (error) {
+            console.error('Error confirming action:', error);
+        }
+    };
 
-  if (typeof data.response === "object") {
-    data.response = data.response.response;
-  }
+    const response = typeof data?.response === 'object' 
+        ? data.response.response 
+        : data?.response;
 
-  let displayText = (data.response || "").trim();
-  if (!displayText && requiresConfirm) {
-    displayText = `Agent is ready to run "${data.tool}". Please confirm.`;
-  }
+    const displayText = (response || '').trim();
+    const requiresConfirm = data.next === "confirm" && isLastMessage;
+    const defaultText = requiresConfirm 
+        ? `Agent is ready to run "${data.tool}". Please confirm.` 
+        : '';
 
-  return (
-    <div className="space-y-2">
-      <MessageBubble message={{ response: displayText }} />
-      {requiresConfirm && (
-        <ConfirmInline
-          data={data}
-          confirmed={isConfirmed}
-          onConfirm={handleConfirm}
-        />
-      )}
-      {!requiresConfirm && data.tool && data.next === "confirm" && (
-        <div className="text-sm text-center  text-green-600 dark:text-green-400">
-          <div>
-            Agent chose tool: <strong>{data.tool ?? "Unknown"}</strong>
-          </div>
+    return (
+        <div ref={responseRef} className="space-y-2">
+            <MessageBubble 
+                message={{ response: displayText || defaultText }} 
+            />
+            {requiresConfirm && (
+                <ConfirmInline
+                    data={data}
+                    confirmed={isConfirmed}
+                    onConfirm={handleConfirm}
+                />
+            )}
+            {!requiresConfirm && data.tool && data.next === "confirm" && (
+                <div className="text-sm text-center text-green-600 dark:text-green-400">
+                    <div>
+                        Agent chose tool: <strong>{data.tool ?? "Unknown"}</strong>
+                    </div>
+                </div>
+            )}
         </div>
-      )}
-    </div>
-  );
-}
+    );
+});
+
+LLMResponse.displayName = 'LLMResponse';
+
+export default LLMResponse;

frontend/src/components/LoadingIndicator.jsx

@@ -1,11 +1,24 @@
-import React from "react";
+import React, { memo } from "react";
 
-export default function LoadingIndicator() {
-  return (
-    <div className="flex items-center justify-center space-x-2 pb-4">
-      <div className="w-2 h-2 rounded-full bg-blue-600 animate-ping"></div>
-      <div className="w-2 h-2 rounded-full bg-blue-600 animate-ping delay-100"></div>
-      <div className="w-2 h-2 rounded-full bg-blue-600 animate-ping delay-200"></div>
-    </div>
-  );
-}
+const LoadingIndicator = memo(() => {
+    return (
+        <div 
+            className="flex items-center justify-center space-x-2 pb-4"
+            role="status"
+            aria-label="Loading"
+        >
+            {[0, 1, 2].map((i) => (
+                <div
+                    key={i}
+                    className={`w-2 h-2 rounded-full bg-blue-600 animate-ping
+                        ${i > 0 ? `delay-${i}00` : ''}`}
+                />
+            ))}
+            <span className="sr-only">Loading...</span>
+        </div>
+    );
+});
+
+LoadingIndicator.displayName = 'LoadingIndicator';
+
+export default LoadingIndicator;

frontend/src/components/MessageBubble.jsx

@@ -1,50 +1,53 @@
-import React from "react";
+import React, { memo } from "react";
 
-export default function MessageBubble({ message, fallback = "", isUser = false }) {
-  const bubbleStyle = isUser
-    ? "bg-blue-600 text-white self-end"
-    : "bg-gray-300 text-gray-900 dark:bg-gray-600 dark:text-gray-100";
+const MessageBubble = memo(({ message, fallback = "", isUser = false }) => {
+    const displayText = message.response?.trim() ? message.response : fallback;
 
-  const displayText = message.response?.trim() ? message.response : fallback;
+    if (displayText.startsWith("###")) {
+        return null;
+    }
 
-  if (displayText.startsWith("###")) {
-    return null;
-  }
+    const renderTextWithLinks = (text) => {
+        const urlRegex = /(https?:\/\/[^\s]+)/g;
+        const parts = text.split(urlRegex);
 
-  // Function to detect and render URLs as links
-  const renderTextWithLinks = (text) => {
-    const urlRegex = /(https?:\/\/[^\s]+)/g;
-    const parts = text.split(urlRegex);
+        return parts.map((part, index) => {
+            if (urlRegex.test(part)) {
+                return (
+                    <a
+                        key={index}
+                        href={part}
+                        target="_blank"
+                        rel="noopener noreferrer"
+                        className="text-blue-500 hover:text-blue-600 underline"
+                        aria-label={`External link to ${part}`}
+                    >
+                        {part}
+                    </a>
+                );
+            }
+            return part;
+        });
+    };
 
-    return parts.map((part, index) => {
-      if (urlRegex.test(part)) {
-        return (
-          <a
-            key={index}
-            href={part}
-            target="_blank"
-            rel="noopener noreferrer"
-            className="text-blue-500 underline"
-          >
-            {part}
-          </a>
-        );
-      }
-      return part;
-    });
-  };
+    return (
+        <div
+            className={`
+                inline-block px-4 py-2 mb-1 rounded-lg
+                ${isUser 
+                    ? "ml-auto bg-blue-100 dark:bg-blue-900 dark:text-white" 
+                    : "mr-auto bg-gray-200 dark:bg-gray-700 dark:text-white"
+                }
+                break-words max-w-[75%] transition-colors duration-200
+            `}
+            role="article"
+            aria-label={`${isUser ? 'User' : 'Agent'} message`}
+        >
+            {renderTextWithLinks(displayText)}
+        </div>
+    );
+});
 
-  return (
-    <div
-      className={`inline-block px-4 py-2 mb-1 rounded-lg ${
-        isUser ? "ml-auto bg-blue-100" : "mr-auto bg-gray-200"
-      } break-words`}
-      style={{
-        whiteSpace: "pre-wrap",
-        maxWidth: "75%", // or '80%'
-      }}
-    >
-      {renderTextWithLinks(displayText)}
-    </div>
-  );
-}
+MessageBubble.displayName = 'MessageBubble';
+
+export default MessageBubble;

frontend/src/components/NavBar.jsx

@@ -1,11 +1,20 @@
-import React from "react";
+import React, { memo } from "react";
 
-export default function NavBar({ title }) {
-  return (
-    <header className="fixed top-0 left-0 w-full p-4 bg-white/70 dark:bg-gray-800/70 
-                       backdrop-blur-md shadow-md z-10 flex justify-center">
-      <h1 className="text-xl font-bold font-poppins">{title}</h1>
-      {/* ...any additional nav items... */}
-    </header>
-  );
-}
+const NavBar = memo(({ title }) => {
+    return (
+        <header 
+            className="fixed top-0 left-0 w-full p-4 bg-white/70 dark:bg-gray-800/70 
+                backdrop-blur-md shadow-md z-10 flex justify-center items-center
+                transition-colors duration-200"
+            role="banner"
+        >
+            <h1 className="text-xl font-bold font-poppins">
+                {title}
+            </h1>
+        </header>
+    );
+});
+
+NavBar.displayName = 'NavBar';
+
+export default NavBar;

frontend/src/pages/App.jsx

@@ -1,74 +1,153 @@
-import React, { useEffect, useState, useRef } from "react";
+import React, { useEffect, useState, useRef, useCallback } from "react";
 import NavBar from "../components/NavBar";
 import ChatWindow from "../components/ChatWindow";
+import { apiService } from "../services/api";
 
 const POLL_INTERVAL = 500; // 0.5 seconds
+const INITIAL_ERROR_STATE = { visible: false, message: '' };
+const DEBOUNCE_DELAY = 300; // 300ms debounce for user input
+
+function useDebounce(value, delay) {
+    const [debouncedValue, setDebouncedValue] = useState(value);
+
+    useEffect(() => {
+        const handler = setTimeout(() => {
+            setDebouncedValue(value);
+        }, delay);
+
+        return () => {
+            clearTimeout(handler);
+        };
+    }, [value, delay]);
+
+    return debouncedValue;
+}
 
 export default function App() {
     const containerRef = useRef(null);
     const inputRef = useRef(null);
+    const pollingRef = useRef(null);
+    const scrollTimeoutRef = useRef(null);
+    
     const [conversation, setConversation] = useState([]);
-    const [lastMessage, setLastMessage] = useState(null); // New state for tracking the last message
+    const [lastMessage, setLastMessage] = useState(null);
     const [userInput, setUserInput] = useState("");
     const [loading, setLoading] = useState(false);
+    const [error, setError] = useState(INITIAL_ERROR_STATE);
     const [done, setDone] = useState(true);
 
-    useEffect(() => {
-        // Poll /get-conversation-history every 0.5 seconds
-        const intervalId = setInterval(async () => {
-            try {
-                const res = await fetch("http://127.0.0.1:8000/get-conversation-history");
-                if (res.ok) {
-                    const data = await res.json();
-                    const newConversation = data.messages || [];
-                    setConversation(newConversation);
+    const debouncedUserInput = useDebounce(userInput, DEBOUNCE_DELAY);
 
-                    if (newConversation.length > 0) {
-                        const lastMsg = newConversation[newConversation.length - 1];
-                        setLoading(lastMsg.actor !== "agent");
-                        setDone(lastMsg.response.next === "done");
+    // Error handling utility with auto-dismiss
+    const handleError = useCallback((error, context) => {
+        console.error(`${context}:`, error);
+        const errorMessage = error.status === 400 
+            ? error.message 
+            : `Error ${context.toLowerCase()}. Please try again.`;
+            
+        setError({
+            visible: true,
+            message: errorMessage
+        });
+        
+        const timer = setTimeout(() => setError(INITIAL_ERROR_STATE), 3000);
+        return () => clearTimeout(timer);
+    }, []);
 
-                        // Only scroll if the last message changes
-                        if (!lastMessage || lastMsg.response.response !== lastMessage.response.response) {
-                            setLastMessage(lastMsg); // Update the last message
-                        }
-                    } else {
-                        setLoading(false);
-                        setDone(true);
-                        setLastMessage(null); // Clear last message if no messages
-                    }
+    const fetchConversationHistory = useCallback(async () => {
+        try {
+            const data = await apiService.getConversationHistory();
+            const newConversation = data.messages || [];
+            
+            setConversation(prevConversation => {
+                // Only update if there are actual changes
+                if (JSON.stringify(prevConversation) !== JSON.stringify(newConversation)) {
+                    return newConversation;
                 }
-            } catch (err) {
-                console.error("Error fetching conversation history:", err);
+                return prevConversation;
+            });
+
+            if (newConversation.length > 0) {
+                const lastMsg = newConversation[newConversation.length - 1];
+                const isAgentMessage = lastMsg.actor === "agent";
+                
+                setLoading(!isAgentMessage);
+                setDone(lastMsg.response.next === "done");
+
+                setLastMessage(prevLastMessage => {
+                    if (!prevLastMessage || lastMsg.response.response !== prevLastMessage.response.response) {
+                        return lastMsg;
+                    }
+                    return prevLastMessage;
+                });
+            } else {
+                setLoading(false);
+                setDone(true);
+                setLastMessage(null);
             }
-        }, POLL_INTERVAL);
+        } catch (err) {
+            handleError(err, "fetching conversation");
+        }
+    }, [handleError]);
 
-        return () => clearInterval(intervalId);
-    }, [lastMessage]);
+    // Setup polling with cleanup
+    useEffect(() => {
+        pollingRef.current = setInterval(fetchConversationHistory, POLL_INTERVAL);
+        
+        return () => {
+            if (pollingRef.current) {
+                clearInterval(pollingRef.current);
+            }
+        };
+    }, [fetchConversationHistory]);
+
+    const scrollToBottom = useCallback(() => {
+        if (containerRef.current) {
+            if (scrollTimeoutRef.current) {
+                clearTimeout(scrollTimeoutRef.current);
+            }
+            
+            scrollTimeoutRef.current = setTimeout(() => {
+                const element = containerRef.current;
+                element.scrollTop = element.scrollHeight;
+                scrollTimeoutRef.current = null;
+            }, 100);
+        }
+    }, []);
+
+    const handleContentChange = useCallback(() => {
+        scrollToBottom();
+    }, [scrollToBottom]);
 
     useEffect(() => {
-        if (containerRef.current && lastMessage) {
-            containerRef.current.scrollTop = containerRef.current.scrollHeight;
+        if (lastMessage) {
+            scrollToBottom();
         }
-    }, [lastMessage]); // Scroll only when the last message changes
+    }, [lastMessage, scrollToBottom]);
 
     useEffect(() => {
-        if (inputRef.current) {
-            inputRef.current.focus(); // Ensure the input box retains focus
+        if (inputRef.current && !loading && !done) {
+            inputRef.current.focus();
         }
-    }, [userInput, loading, done]);
+        
+        return () => {
+            if (scrollTimeoutRef.current) {
+                clearTimeout(scrollTimeoutRef.current);
+            }
+        };
+    }, [loading, done]);
 
     const handleSendMessage = async () => {
-        if (!userInput.trim()) return;
+        const trimmedInput = userInput.trim();
+        if (!trimmedInput) return;
+        
         try {
             setLoading(true);
-            await fetch(
-                `http://127.0.0.1:8000/send-prompt?prompt=${encodeURIComponent(userInput)}`,
-                { method: "POST" }
-            );
+            setError(INITIAL_ERROR_STATE);
+            await apiService.sendMessage(trimmedInput);
             setUserInput("");
         } catch (err) {
-            console.error("Error sending prompt:", err);
+            handleError(err, "sending message");
             setLoading(false);
         }
     };
@@ -76,29 +155,25 @@ export default function App() {
     const handleConfirm = async () => {
         try {
             setLoading(true);
-            await fetch("http://127.0.0.1:8000/confirm", { method: "POST" });
+            setError(INITIAL_ERROR_STATE);
+            await apiService.confirm();
         } catch (err) {
-            console.error("Confirm error:", err);
+            handleError(err, "confirming action");
             setLoading(false);
         }
     };
 
     const handleStartNewChat = async () => {
         try {
-            await fetch(
-                `http://127.0.0.1:8000/send-prompt?prompt=${encodeURIComponent("I'd like to travel for an event.")}`,
-                { method: "POST" }
-            );
-            setConversation([]); // Clear local state
-            setLastMessage(null); // Reset last message
+            setError(INITIAL_ERROR_STATE);
+            setLoading(true);
+            await apiService.sendMessage("I'd like to travel for an event.");
+            setConversation([]);
+            setLastMessage(null);
         } catch (err) {
-            console.error("Error ending chat:", err);
-        }
-    };
-
-    const handleKeyPress = (e) => {
-        if (e.key === "Enter") {
-            handleSendMessage();
+            handleError(err, "starting new chat");
+        } finally {
+            setLoading(false);
         }
     };
 
@@ -106,19 +181,28 @@ export default function App() {
         <div className="flex flex-col h-screen">
             <NavBar title="Temporal AI Agent 🤖" />
 
-            {/* Centered content, but no manual bottom margin */}
+            {error.visible && (
+                <div className="fixed top-16 left-1/2 transform -translate-x-1/2 
+                    bg-red-500 text-white px-4 py-2 rounded shadow-lg z-50 
+                    transition-opacity duration-300">
+                    {error.message}
+                </div>
+            )}
+
             <div className="flex-grow flex justify-center px-4 py-2 overflow-hidden">
                 <div className="w-full max-w-lg bg-white dark:bg-gray-900 p-8 px-3 rounded shadow-md 
-                                flex flex-col overflow-hidden">
-                    {/* Scrollable chat area */}
-                    <div ref={containerRef} className="flex-grow overflow-y-auto pb-20 pt-10">
+                    flex flex-col overflow-hidden">
+                    <div ref={containerRef} 
+                        className="flex-grow overflow-y-auto pb-20 pt-10 scroll-smooth">
                         <ChatWindow
                             conversation={conversation}
                             loading={loading}
                             onConfirm={handleConfirm}
+                            onContentChange={handleContentChange}
                         />
                         {done && (
-                            <div className="text-center text-sm text-gray-500 dark:text-gray-400 mt-4">
+                            <div className="text-center text-sm text-gray-500 dark:text-gray-400 mt-4 
+                                animate-fade-in">
                                 Chat ended
                             </div>
                         )}
@@ -126,41 +210,49 @@ export default function App() {
                 </div>
             </div>
 
-            {/* Fixed bottom input */}
-            <div
-                className="fixed bottom-0 left-1/2 transform -translate-x-1/2 
+            <div className="fixed bottom-0 left-1/2 transform -translate-x-1/2 
                 w-full max-w-lg bg-white dark:bg-gray-900 p-4
-                border-t border-gray-300 dark:border-gray-700"
-                style={{ zIndex: 10 }}
-            >
-                <div className="flex items-center">
+                border-t border-gray-300 dark:border-gray-700 shadow-lg
+                transition-all duration-200"
+                style={{ zIndex: 10 }}>
+                <form onSubmit={(e) => {
+                    e.preventDefault();
+                    handleSendMessage();
+                }} className="flex items-center">
                     <input
                         ref={inputRef}
                         type="text"
                         className={`flex-grow rounded-l px-3 py-2 border border-gray-300
-                        dark:bg-gray-700 dark:border-gray-600 focus:outline-none
-                        ${loading || done ? "opacity-50 cursor-not-allowed" : ""}`}
+                            dark:bg-gray-700 dark:border-gray-600 focus:outline-none
+                            transition-opacity duration-200
+                            ${loading || done ? "opacity-50 cursor-not-allowed" : ""}`}
                         placeholder="Type your message..."
                         value={userInput}
                         onChange={(e) => setUserInput(e.target.value)}
-                        onKeyPress={handleKeyPress}
                         disabled={loading || done}
+                        aria-label="Type your message"
                     />
                     <button
-                        onClick={handleSendMessage}
+                        type="submit"
                         className={`bg-blue-600 hover:bg-blue-700 text-white px-4 py-2 rounded-r 
-                        ${loading || done ? "opacity-50 cursor-not-allowed" : ""}`}
+                            transition-all duration-200
+                            ${loading || done ? "opacity-50 cursor-not-allowed" : ""}`}
                         disabled={loading || done}
+                        aria-label="Send message"
                     >
                         Send
                     </button>
-                </div>
+                </form>
+                
                 <div className="text-right mt-3">
                     <button
                         onClick={handleStartNewChat}
-                        className={`text-sm underline text-gray-600 dark:text-gray-400 hover:text-gray-800 dark:hover:text-gray-200 
-                        ${!done ? "opacity-0 cursor-not-allowed" : ""}`}
+                        className={`text-sm underline text-gray-600 dark:text-gray-400 
+                            hover:text-gray-800 dark:hover:text-gray-200 
+                            transition-all duration-200
+                            ${!done ? "opacity-0 cursor-not-allowed" : ""}`}
                         disabled={!done}
+                        aria-label="Start new chat"
                     >
                         Start New Chat
                     </button>

frontend/src/services/api.js

@@ -0,0 +1,75 @@
+const API_BASE_URL = 'http://127.0.0.1:8000';
+
+class ApiError extends Error {
+    constructor(message, status) {
+        super(message);
+        this.status = status;
+        this.name = 'ApiError';
+    }
+}
+
+async function handleResponse(response) {
+    if (!response.ok) {
+        const errorData = await response.json().catch(() => ({}));
+        throw new ApiError(
+            errorData.message || 'An error occurred',
+            response.status
+        );
+    }
+    return response.json();
+}
+
+export const apiService = {
+    async getConversationHistory() {
+        try {
+            const res = await fetch(`${API_BASE_URL}/get-conversation-history`);
+            return handleResponse(res);
+        } catch (error) {
+            throw new ApiError(
+                'Failed to fetch conversation history',
+                error.status || 500
+            );
+        }
+    },
+
+    async sendMessage(message) {
+        if (!message?.trim()) {
+            throw new ApiError('Message cannot be empty', 400);
+        }
+
+        try {
+            const res = await fetch(
+                `${API_BASE_URL}/send-prompt?prompt=${encodeURIComponent(message)}`,
+                { 
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json'
+                    }
+                }
+            );
+            return handleResponse(res);
+        } catch (error) {
+            throw new ApiError(
+                'Failed to send message',
+                error.status || 500
+            );
+        }
+    },
+
+    async confirm() {
+        try {
+            const res = await fetch(`${API_BASE_URL}/confirm`, { 
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json'
+                }
+            });
+            return handleResponse(res);
+        } catch (error) {
+            throw new ApiError(
+                'Failed to confirm action',
+                error.status || 500
+            );
+        }
+    }
+};