require 'uri'
require 'open-uri'
class Attachment < ApplicationRecord
  belongs_to :account
  belongs_to :message
  mount_uploader :file, AttachmentUploader # used for images
  enum file_type: [:image, :audio, :video, :file, :location, :fallback]

  before_create :set_file_extension

  def push_event_data
    return base_data.merge(location_metadata) if file_type.to_sym == :location
    return base_data.merge(fallback_data) if file_type.to_sym == :fallback

    base_data.merge(file_metadata)
  end

  private

  def file_metadata
    {
      extension: extension,
      data_url: file_url,
      thumb_url: file.try(:thumb).try(:url) # will exist only for images
    }
  end

  def location_metadata
    {
      coordinates_lat: coordinates_lat,
      coordinates_long: coordinates_long,
      fallback_title: fallback_title,
      data_url: external_url
    }
  end

  def fallback_data
    {
      fallback_title: fallback_title,
      data_url: external_url
    }
  end

  def base_data
    {
      id: id,
      message_id: message_id,
      file_type: file_type,
      account_id: account_id
    }
  end

  def set_file_extension
    if external_url && !fallback?
      self.extension = begin
                         Pathname.new(URI(external_url).path).extname
                       rescue StandardError
                         nil
                       end
    end
  end
end