Function handleFileUpload

app/submit/page.tsx:273–297

(e: React.ChangeEvent<HTMLInputElement>)

  }

  const handleFileUpload = (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0]
    if (!file) return

    if (!file.name.endsWith(".json")) {
      setJsonError("Please upload a .json file")
      return
    }

    const reader = new FileReader()
    reader.onload = (event) => {
      const content = event.target?.result as string
      setJsonInput(content)
      parseAndApplyJson(content)
    }
    reader.onerror = () => {
      setJsonError("Failed to read file")
    }
    reader.readAsText(file)
    
    // Reset file input
    if (fileInputRef.current) {
      fileInputRef.current.value = ""
    }
  }

  const handleSubmit = async (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault()