fix: simplify InputFileComponent to use native file picker (langflow-…

…ai#5692)

* ✨ (index.tsx): Add useRef hook to manage file input element reference for better control over file selection process
🐛 (index.tsx): Fix handleButtonClick function to handle file selection asynchronously and provide fallback option if file selection fails
🐛 (index.tsx): Fix handleNativeInputChange function to correctly handle file selection from native file input element and reset its value after selection

* 📝 (index.tsx): Remove unused createFileUpload function and simplify handleButtonClick function to trigger file input click directly
♻️ (index.tsx): Refactor input element to use Button component for better styling and consistency

* 📝 (inputFileComponent/index.tsx): remove unnecessary comment in handleButtonClick function

src/frontend/src/components/core/parameterRenderComponent/components/inputFileComponent/index.tsx

@@ -1,8 +1,7 @@
 import { usePostUploadFile } from "@/controllers/API/queries/files/use-post-upload-file";
-import { createFileUpload } from "@/helpers/create-file-upload";
 import useFileSizeValidator from "@/shared/hooks/use-file-size-validator";
 import { cn } from "@/utils/utils";
-import { useEffect } from "react";
+import { useEffect, useRef } from "react";
 import {
   CONSOLE_ERROR_MSG,
   INVALID_FILE_ALERT,
@@ -24,70 +23,77 @@ export default function InputFileComponent({
   const currentFlowId = useFlowsManagerStore((state) => state.currentFlowId);
   const setErrorData = useAlertStore((state) => state.setErrorData);
   const { validateFileSize } = useFileSizeValidator(setErrorData);
+  const fileInputRef = useRef<HTMLInputElement>(null);
 
   // Clear component state
   useEffect(() => {
     if (disabled && value !== "") {
       handleOnNewValue({ value: "", file_path: "" }, { skipSnapshot: true });
     }
-  }, [disabled, handleOnNewValue]);
+  }, [disabled, handleOnNewValue, value]);
 
   function checkFileType(fileName: string): boolean {
-    if (fileTypes === undefined) return true;
-    for (let index = 0; index < fileTypes.length; index++) {
-      if (fileName.endsWith(fileTypes[index])) {
-        return true;
-      }
-    }
-    return false;
+    if (!fileTypes?.length) return true;
+    return fileTypes.some((type) =>
+      fileName.toLowerCase().endsWith(type.toLowerCase()),
+    );
   }
 
   const { mutate, isPending } = usePostUploadFile();
 
-  const handleButtonClick = (): void => {
-    createFileUpload({ multiple: false, accept: fileTypes?.join(",") }).then(
-      (files) => {
-        const file = files[0];
-        if (file) {
-          if (!validateFileSize(file)) {
-            return;
-          }
+  const handleFileSelection = (file: File | null) => {
+    if (!file) {
+      setErrorData({
+        title: "Error selecting file",
+        list: ["No file was selected"],
+      });
+      return;
+    }
 
-          if (checkFileType(file.name)) {
-            // Upload the file
-            mutate(
-              { file, id: currentFlowId },
-              {
-                onSuccess: (data) => {
-                  // Get the file name from the response
-                  const { file_path } = data;
+    if (!validateFileSize(file)) {
+      return;
+    }
 
-                  // sets the value that goes to the backend
-                  // Update the state and on with the name of the file
-                  // sets the value to the user
-                  handleOnNewValue({ value: file.name, file_path });
-                },
-                onError: (error) => {
-                  console.error(CONSOLE_ERROR_MSG);
-                  setErrorData({
-                    title: "Error uploading file",
-                    list: [error.response?.data?.detail],
-                  });
-                },
-              },
-            );
-          } else {
-            // Show an error if the file type is not allowed
-            setErrorData({
-              title: INVALID_FILE_ALERT,
-              list: [fileTypes?.join(", ") || ""],
-            });
-          }
-        }
+    if (!checkFileType(file.name)) {
+      setErrorData({
+        title: INVALID_FILE_ALERT,
+        list: [fileTypes?.join(", ") || ""],
+      });
+      return;
+    }
+
+    mutate(
+      { file, id: currentFlowId },
+      {
+        onSuccess: (data) => {
+          const { file_path } = data;
+          handleOnNewValue({ value: file.name, file_path });
+        },
+        onError: (error) => {
+          console.error(CONSOLE_ERROR_MSG);
+          setErrorData({
+            title: "Error uploading file",
+            list: [error.response?.data?.detail || "Unknown error occurred"],
+          });
+        },
       },
     );
   };
 
+  const handleButtonClick = () => {
+    fileInputRef.current?.click();
+  };
+
+  const handleNativeInputChange = (
+    event: React.ChangeEvent<HTMLInputElement>,
+  ) => {
+    const file = event.target.files?.[0] || null;
+    handleFileSelection(file);
+    if (event.target) {
+      event.target.value = "";
+    }
+  };
+
   const isDisabled = disabled || isPending;
 
   return (
@@ -96,18 +102,29 @@ export default function InputFileComponent({
         <div className="flex items-center gap-2.5">
           <div className="relative flex w-full">
             <div className="w-full">
-              <input
+              <Button
+                unstyled
                 data-testid="input-file-component"
-                type="text"
                 className={cn(
-                  "primary-input h-9 w-full cursor-pointer rounded-r-none text-sm focus:border-border focus:outline-none focus:ring-0",
+                  "primary-input h-9 w-full justify-start rounded-r-none text-sm focus:border-border focus:outline-none focus:ring-0",
                   !value && "text-placeholder-foreground",
                   editNode && "h-6",
                 )}
-                value={value || "Upload a file..."}
-                readOnly
-                disabled={isDisabled}
                 onClick={handleButtonClick}
+                disabled={isDisabled}
+                variant="outline"
+              >
+                <span className={cn(editNode && "relative -top-1.5")}>
+                  {value || "Upload a file..."}
+                </span>
+              </Button>
+              <input
+                ref={fileInputRef}
+                type="file"
+                className="hidden"
+                accept={fileTypes?.join(",")}
+                onChange={handleNativeInputChange}
+                onClick={(e) => e.stopPropagation()}
               />
             </div>
             <div>