chatbot-ui starter

components/Chat/ChatInput.tsx

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+import { Message } from "@/types";
+import { IconArrowUp } from "@tabler/icons-react";
+import { FC, KeyboardEvent, useEffect, useRef, useState } from "react";
+
+interface Props {
+  onSend: (message: Message) => void;
+}
+
+export const ChatInput: FC<Props> = ({ onSend }) => {
+  const [content, setContent] = useState<string>();
+
+  const textareaRef = useRef<HTMLTextAreaElement>(null);
+
+  const handleChange = (e: React.ChangeEvent<HTMLTextAreaElement>) => {
+    const value = e.target.value;
+    if (value.length > 4000) {
+      alert("Message limit is 4000 characters");
+      return;
+    }
+
+    setContent(value);
+  };
+
+  const handleSend = () => {
+    if (!content) {
+      alert("Please enter a message");
+      return;
+    }
+    onSend({ role: "user", content });
+    setContent("");
+  };
+
+  const handleKeyDown = (e: KeyboardEvent<HTMLTextAreaElement>) => {
+    if (e.key === "Enter" && !e.shiftKey) {
+      e.preventDefault();
+      handleSend();
+    }
+  };
+
+  useEffect(() => {
+    if (textareaRef && textareaRef.current) {
+      textareaRef.current.style.height = "inherit";
+      textareaRef.current.style.height = `${textareaRef.current?.scrollHeight}px`;
+    }
+  }, [content]);
+
+  return (
+    <div className="relative">
+      <textarea
+        ref={textareaRef}
+        className="min-h-[44px] rounded-lg pl-4 pr-12 py-2 w-full focus:outline-none focus:ring-1 focus:ring-neutral-300 border-2 border-neutral-200"
+        style={{ resize: "none" }}
+        placeholder="Type a message..."
+        value={content}
+        rows={1}
+        onChange={handleChange}
+        onKeyDown={handleKeyDown}
+      />
+
+      <button onClick={() => handleSend()}>
+        <IconArrowUp className="absolute right-2 bottom-3 h-8 w-8 hover:cursor-pointer rounded-full p-1 bg-blue-500 text-white hover:opacity-80" />
+      </button>
+    </div>
+  );
+};