class Eco::API::UseCases::Default::People::Treat::SupersHierarchy < Eco::API::Common::Loaders::UseCase
  name "supers-hierarchy"
  type :export

  require_relative 'cli/supers_hierachy_cli'

  OUT_FOLDER      = "sftp".freeze
  OUT_TIME_FORMAT = '%Y%m%dT%H%M%S'.freeze
  OUT_FILENAME    = "supers_hierarchy".freeze

  attr_reader :people

  def main(people, _session, options, _usecase)
    options[:end_get] = false
    @people = people

    save!(hierarchy, file: output_filename)
  end

  private

  def hierarchy
    Eco::API::Common::People::SupervisorHelpers.supervisors_tree(people)
  end

  def save!(data, file:)
    ext = File.extname(file).downcase.delete(".")

    case ext
    when "txt"
      create_file(data, file: file, format: :txt)
    when "html"
      puts "html is still not supported"
      exit(1)
      # create_file(data, file: file, format: :html)
    when "json"
      puts "json is still not supported"
      exit(1)
      # create_file(data, file: file, format: :json)
    end
  end

  def create_file(tree, file:, format: :txt)
    File.open(file, "w") do |fd|
      fd << tree_to_str(tree, format: format)
    end

    log(:info) {
      "Generated file #{file}"
    }
  end

  def tree_to_str(tree, lev: 0, format: :txt)
    msg = "Required Hash tree structure. Given: #{tree.class}"
    raise msg unless tree.is_a?(Hash)

    "".tap do |str|
      tree.each do |entry, subtree|
        str << "#{"  " * lev}#{lev.positive? ? "+-#{lev}- " : ""}"
        str << (entry.name || entry.email || entry.external_id || entry.id)
        str << " (#{entry.external_id}|#{entry.email}|#{entry.id})\n"
        str << tree_to_str(subtree, lev: lev + 1, format: format) unless !subtree || subtree.empty?
      end
    end
  end

  def output_filename(ext: 'txt')
    @output_filename ||= options.dig(:output, :file) || default_output_filename(ext: ext)
  end

  def default_output_filename(name = self.class::OUT_FILENAME, ext: nil)
    File.join(output_folder, "#{timestamp}_#{config.active_enviro}_#{name}.#{ext}")
  end

  def output_folder
    "#{config.active_enviro}/#{self.class::OUT_FOLDER}"
  end

  def timestamp(date = Time.now)
    date.strftime(self.class::OUT_TIME_FORMAT)
  end
end