file_uploader.rb

# Takes in CSV files and creates background jobs to process them
class FileUploader
  attr_accessor :category,
                :input_file,
                :filename,
                :reference,
                :result_message,
                :organization

  UPLOADABLE_MODELS = [
    Measurement,
    MortalityEvent
  ].freeze
  UPLOAD_JOBS = UPLOADABLE_MODELS.map { |model| "#{model}Job".constantize }

  FILE_UPLOAD_CATEGORIES = UPLOADABLE_MODELS.map { |model| [model.to_s, model.to_s.gsub(" ", "")] }.freeze

  def initialize(category:, input_file:, organization:)
    @category = category
    @organization = organization
    @input_file = input_file
  end

  def process
    if FILE_UPLOAD_CATEGORIES.map { |_label, value| value }.include?(category)
      queue_spreadsheet
    else
      self.result_message = 'Error: Invalid category!'
    end

    self
  end

  def queue_spreadsheet
    temporary_file = TemporaryFile.create(contents: input_file.read)
    self.filename = input_file.original_filename
    job_class = [category, 'Job'].join
    job_class.constantize.perform_later(temporary_file, filename, organization)
    self.result_message = "Successfully queued spreadsheet for import as a #{job_class}."
  rescue StandardError => e
    self.result_message = "Error: File could not be uploaded: #{e.message}"
  end
end