add chat to homepage

frontend/src/app/page.tsx

@@ -1,7 +1,9 @@
+import MainChat from "@/components/main-chat/main-chat";
 
 export default function Home() {
     return (
         <main>
+            <MainChat />
         </main>
     )
 }

frontend/src/components/chat-list/chat-list.module.css

@@ -0,0 +1,47 @@
+.chatList {
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+    padding: 16px;
+}
+
+.messageContainer {
+    display: flex;
+    align-items: flex-start; 
+}
+
+.botContainer {
+    justify-content: flex-start;
+}
+
+.userContainer {
+    justify-content: flex-end;
+}
+
+.avatar {
+    margin-right: 8px;
+}
+
+.card {
+    max-width: 80%;
+    padding: 3px;
+    border-radius: 16px;
+    font-size: 0.875rem;
+    line-height: 1.25rem;
+    word-wrap: break-word;
+}
+
+.cardBody {
+    padding: 4px 8px;
+}
+
+.bot {
+    background-color: #f1f5f9;
+    align-self: flex-start;
+}
+
+.user {
+    background-color: #e6f1fe;
+    color: #006FEE;
+    align-self: flex-end;
+}

frontend/src/components/chat-list/chat-list.tsx

@@ -0,0 +1,35 @@
+import { Avatar, Card, CardBody } from "@nextui-org/react";
+import classes from "./chat-list.module.css"
+import { Message } from "../main-chat/main-chat";
+
+interface ChatListProps {
+    messages: Message[];
+}
+
+export default function ChatList({ messages }: ChatListProps) {
+    return (
+        <div className={classes.chatList}>
+          {messages.map((msg, index) => (
+            <div key={index} className={`${classes.messageContainer} ${msg.type === "user" ? classes.userContainer : classes.botContainer}`}>
+              {msg.type === "bot" && (
+                <Avatar
+                  name="S"
+                  size="sm"
+                  className={classes.avatar}
+                />
+              )}
+              <Card
+                className={`${classes.card} ${msg.type === "user" ? classes.user : classes.bot}`}
+                fullWidth={false}
+                radius="lg"
+                shadow="none"
+              >
+                <CardBody className={classes.cardBody}>
+                  <p>{msg.text}</p>
+                </CardBody>
+              </Card>
+            </div>
+          ))}
+        </div>
+    );
+}

frontend/src/components/main-chat/main-chat.tsx

@@ -0,0 +1,60 @@
+'use client';
+
+import { useState } from "react";
+import ChatList from "@/components/chat-list/chat-list";
+import SearchBar from "@/components/search-bar/search-bar";
+import { Spacer } from "@nextui-org/react";
+
+export type Message = {
+    type: "user" | "bot",
+    text: string
+}
+
+export default function MainChat() {
+    const [messages, setMessages] = useState<Message[]>([
+        { type: "bot", text: "Hello! How can I help you today?" }
+    ]);
+    const [userInput, setUserInput] = useState("");
+    const [botResponse, setBotResponse] = useState("");
+    const [isBotResponseGenerating, setIsBotResponseGenerating] = useState<boolean>(false);
+
+    const handleUserInput = (input: string) => {
+        setMessages((prevMessages) => [
+            ...prevMessages,
+            { type: "user", text: input }
+        ]);
+        setUserInput("");
+    };
+
+    const handleBotResponse = (response: string) => {
+        setMessages((prevMessages) => [
+            ...prevMessages,
+            { type: "bot", text: response }
+        ]);
+        setBotResponse("");
+    };
+
+    //TODO: Change bot response simulation to backend API
+    const simulateBotResponse = (userMessage: string) => {
+      setIsBotResponseGenerating(true);
+      setTimeout(() => {
+        const botReply = `Bot response to: ${userMessage}`;
+        handleBotResponse(botReply);
+        setIsBotResponseGenerating(false);
+      }, 1000);
+    };
+
+    return (
+        <>
+            <ChatList messages={messages} />
+            <Spacer y={4} />
+            <SearchBar
+                userInput={userInput}
+                setUserInput={setUserInput}
+                handleUserInput={handleUserInput}
+                simulateBotResponse={simulateBotResponse}
+                isBotResponseGenerating={isBotResponseGenerating}
+            />
+        </>
+    )
+}

frontend/src/components/main-layout/main-layout.module.css

@@ -1,6 +1,6 @@
 .contentWrapper {
     padding: 2em 5em;
     margin: 0 auto;
-    max-width: 1200px;
+    max-width: 800px;
     box-sizing: border-box;
 }

frontend/src/components/search-bar/search-bar.module.css

@@ -0,0 +1,8 @@
+.searchBar textarea::placeholder{
+    font-style: italic;
+    color: rgba(0, 0, 0, 0.2);
+}
+
+.endContent {
+    margin-top: auto
+}

frontend/src/components/search-bar/search-bar.tsx

@@ -0,0 +1,45 @@
+import { Button, Spinner, Textarea } from "@nextui-org/react";
+import { SearchIcon } from './search-icon';
+import classes from './search-bar.module.css';
+
+interface SearchBarProps {
+    userInput: string;
+    setUserInput: React.Dispatch<React.SetStateAction<string>>;
+    handleUserInput: (message: string) => void;
+    simulateBotResponse: (userMessage: string) => void;
+    isBotResponseGenerating: boolean
+}
+
+export default function SearchBar({ userInput, setUserInput, handleUserInput, simulateBotResponse, isBotResponseGenerating }: SearchBarProps) {
+
+    const handleSend = () => {
+        if (userInput.trim()) {
+          handleUserInput(userInput);
+          simulateBotResponse(userInput);
+        }
+    };
+
+    return (
+        <>
+            <Textarea
+                value={userInput}
+                onChange={(e) => setUserInput(e.target.value)}
+                className={classes.searchBar}
+                type="text"
+                size="md"
+                radius="lg"
+                color="primary"
+                label="How can we help?"
+                labelPlacement="outside"
+                placeholder="I am a dialysis patient in need of financial assistance and food support after being retrenched due to Covid-19."
+                endContent={
+                    isBotResponseGenerating
+                    ? <Spinner className={classes.endContent} size="sm" />
+                    : <Button className={classes.endContent} isIconOnly size="sm" radius="full" onClick={handleSend}>
+                        <SearchIcon />
+                    </Button>
+                }
+            />
+        </>
+    )
+}

frontend/src/components/search-bar/search-icon.jsx

@@ -0,0 +1,27 @@
+export const SearchIcon = (props) => (
+    <svg
+      aria-hidden="true"
+      fill="none"
+      focusable="false"
+      height="1em"
+      role="presentation"
+      viewBox="0 0 24 24"
+      width="1em"
+      {...props}
+    >
+      <path
+        d="M11.5 21C16.7467 21 21 16.7467 21 11.5C21 6.25329 16.7467 2 11.5 2C6.25329 2 2 6.25329 2 11.5C2 16.7467 6.25329 21 11.5 21Z"
+        stroke="gray"
+        strokeLinecap="round"
+        strokeLinejoin="round"
+        strokeWidth="2"
+      />
+      <path
+        d="M22 22L20 20"
+        stroke="gray"
+        strokeLinecap="round"
+        strokeLinejoin="round"
+        strokeWidth="2"
+      />
+    </svg>
+  );