rat-notes-frontend/vite-project/src/App.tsx

import { useEffect, useState } from "react";
import "./App.css";
import { ArrowUpIcon } from "lucide-react";

import {
  InputGroup,
  InputGroupAddon,
  InputGroupButton,
  InputGroupTextarea,
} from "@/components/ui/input-group";

import {
  Card,
  CardContent,
  CardDescription,
  CardFooter,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";

const baseUrl = "http://localhost:8080";
const username = "ratludu";

type Note = {
  id: string;
  content: string;
  title: string;
};

export function InputGroupDemo({ onSent }): {
  onSent?: (note: Note) => void;
} {
  const [text, setText] = useState("");
  const [isSending, setIsSending] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const isEmpty = text.trim().length === 0;

  async function handleSend() {
    const value = text.trim();
    if (!value || isSending) return;

    try {
      setIsSending(true);
      setError(null);
      const resp = await fetch(`${baseUrl}/content`, {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          username: username,
          content: value,
        }),
      });

      if (!resp.ok) {
        const msg = await resp.text().catch(() => "An error occurred");
        throw new Error(msg || "Unknown error");
      }

      const created = {
        id: crypto.randomUUID(),
        content: String(value),
        title: "Note",
      };

      onSent?.(created);
      setText("");
    } catch (e) {
      const msg = e instanceof Error ? e.message : "Unknown error";
      setError(msg);
    } finally {
      setIsSending(false);
    }

    setText("");
  }

  function handleKeyDown(event: React.KeyboardEvent<HTMLInputElement>) {
    if (event.key === "Enter" && !event.shiftKey) {
      event.preventDefault();
      handleSend();
    }
  }

  return (
    <div className="grid w-full max-w-none gap-6">
      <InputGroup>
        <InputGroupTextarea
          placeholder="What are you thinking..."
          value={text}
          onChange={(e: React.ChangeEvent<HTMLTextAreaElement>) =>
            setText(e.target.value)
          }
          onKeyDown={handleKeyDown}
        />
        <InputGroupAddon align="block-end">
          <InputGroupButton
            variant="default"
            className="rounded-full"
            size="icon-xs"
            onClick={handleSend}
            disabled={isEmpty}
            aria-disabled={isEmpty}
            aria-label="Send"
            title={isEmpty ? "Type something first" : "Send"}
          >
            <ArrowUpIcon />
            <span className="sr-only">Send</span>
          </InputGroupButton>
        </InputGroupAddon>
      </InputGroup>
    </div>
  );
}

function NotesList({ notes }: { notes: Note[] }) {
  if (!notes.length) {
    return <p className="text-center">No notes yet.</p>;
  }

  return (
    <div className="space-y-4">
      {notes.map((note) => (
        <Card>
          <CardContent key={note.id}>
            <p>{note.content}</p>
          </CardContent>
        </Card>
      ))}
    </div>
  );
}

function App() {
  const [notes, setNotes] = useState<Note[]>([]);

  function handleSend(newNote: Note) {
    setNotes((prev) => [newNote, ...prev]);
  }

  return (
    <div className="w-150 fixed top-10 left-0 right-0 mx-auto space-y-4">
      <InputGroupDemo onSent={handleSend} />
      <NotesList notes={notes} />
    </div>
  );
}

export default App;