ADD fallback thumbnail

frontend/src/components/video/VideoCard.tsx

@@ -1,36 +1,49 @@
 import clsx from "clsx";
 import { formatTime } from "../../utils/utils.ts";
-import {Link} from "react-router-dom";
+import { Link } from "react-router-dom";
+import { useState } from "react";
 
 type VideoCardProps = {
     title: string,
     duration: number,
-    thumbnailPath: string,
+    thumbnailPath: string | null,
     videoPath: string,
     className?: string
 }
 
+const fallbackThumbnail = "../../../public/default_thumbnail.png";
+
 const VideoCard = ({
                        title,
                        duration,
                        thumbnailPath,
                        videoPath,
-                       className}: VideoCardProps) => {
+                       className
+                   }: VideoCardProps) => {
+
+    const initialSrc = thumbnailPath && thumbnailPath.trim() !== "" ? thumbnailPath : fallbackThumbnail;
+    const [imgSrc, setImgSrc] = useState(initialSrc);
+
     return (
-        <Link
-        to={videoPath}
-        >
+        <Link to={videoPath}>
             <div className={clsx("flex flex-col", className)}>
-                <img src={thumbnailPath} alt="Video Thumbnail" />
+                <img
+                    src={imgSrc}
+                    alt="Video Thumbnail"
+                    onError={() => {
+                        if (imgSrc !== fallbackThumbnail) {
+                            setImgSrc(fallbackThumbnail);
+                        }
+                    }}
+                />
 
                 <div className={"flex flex-row justify-between items-center p-2"}>
                     <p>{title}</p>
                     <p>{formatTime(duration)}</p>
                 </div>
-
             </div>
         </Link>
     );
 }
 
-export default VideoCard;
+export default VideoCard;