feat: implement auto-resizing textarea in ChatInput component

src/components/ui/chat/chat-input.tsx

@@ -6,20 +6,55 @@ interface ChatInputProps
   extends React.TextareaHTMLAttributes<HTMLTextAreaElement> {}
 
 const ChatInput = React.forwardRef<HTMLTextAreaElement, ChatInputProps>(
-  ({ className, ...props }, ref) => (
+  ({ className, onChange, ...props }, ref) => {
+    const internalRef = React.useRef<HTMLTextAreaElement>(null);
+
+    // Combine the forwarded ref with the internal ref
+    React.useImperativeHandle(
+      ref,
+      () => internalRef.current as HTMLTextAreaElement
+    );
+
+    // Function to adjust the height of the textarea
+    const adjustHeight = () => {
+      if (internalRef.current) {
+        // Reset the height to auto to calculate the new height
+        internalRef.current.style.height = "auto";
+        // Set the height to the scrollHeight (content height)
+        internalRef.current.style.height = `${internalRef.current.scrollHeight}px`;
+      }
+    };
+
+    // Adjust height whenever the content changes
+    React.useEffect(() => {
+      adjustHeight();
+    }, [props.value]); // Run whenever the value changes
+
+    // Handle input changes
+    const handleInput = (e: React.ChangeEvent<HTMLTextAreaElement>) => {
+      adjustHeight();
+      if (onChange) {
+        onChange(e); // Call the passed onChange handler
+      }
+    };
+
+    return (
       <Textarea
         mockOnChange={false}
         autoComplete="off"
-      ref={ref}
+        ref={internalRef}
         name="message"
         className={cn(
-        "max-h-12 px-4 py-3 bg-background text-sm placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-ring disabled:cursor-not-allowed disabled:opacity-50 w-full rounded-md flex items-center h-16 resize-none",
+          "max-h-48 px-4 py-3 bg-background text-sm placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-ring disabled:cursor-not-allowed disabled:opacity-50 w-full rounded-md flex items-center resize-none",
           className
         )}
+        onChange={handleInput}
         {...props}
       />
-  )
     );
+  }
+);
+
 ChatInput.displayName = "ChatInput";
 
 export { ChatInput };