module UserManager
  class ImportRemoteAvatar < UserManagerService
    def initialize(user:, avatar_url:)
      @user = user
      @avatar_url = avatar_url
    end

    def call
      if import_remote_avatar
        UserManager::UpdateAvatar.call(user: @user)
      end
    end

    private

    def import_remote_avatar
      tempfile = Down.download(@avatar_url)
      content_type = tempfile.content_type
      unless %w[image/jpeg image/png].include?(content_type)
        Rails.logger.warn { "Wrong content type of remote avatar for user #{user.cn}: '#{content_type}'" }
        return false
      end

      img_data = UserManager::ProcessAvatar.call(io: tempfile)
      tempfile = Tempfile.create
      tempfile.binmode
      tempfile.write(img_data)
      tempfile.rewind

      hash = Digest::SHA256.hexdigest(img_data)
      ext = content_type == "image/png" ? "png" : "jpg"
      filename = "#{hash}.#{ext}"
      key = "users/#{@user.cn}/avatars/#{filename}"

      @user.avatar.attach io: tempfile, key: key, filename: filename
    rescue => e
      Sentry.capture_exception(e) if Setting.sentry_enabled?
      Rails.logger.warn "Importing remote avatar failed: \"#{e.message}\""
      false
    end
  end
end