class ChefCLI::Command::ShowPolicy

def apply_params!(params)
  remaining_args = parse_options(params)
  if remaining_args.empty? && show_summary_diff?
    ui.err("The --summary-diff option can only be used when showing a single policy")
    ui.err("")
    ui.err(opt_parser)
    false
  elsif remaining_args.empty?
    @show_all_policies = true
    true
  elsif remaining_args.size == 1
    @policy_name = remaining_args.first
    @show_all_policies = false
    true
  elsif remaining_args.size == 2
    @policy_name = remaining_args[0]
    @policy_group = remaining_args[1]
    @show_all_policies = false
    true
  else
    ui.err("Too many arguments")
    ui.err("")
    ui.err(opt_parser)
    false
  end
end

def debug?
  !!config[:debug]
end

def enable_pager?
  config[:pager]
end

def handle_error(error)
  ui.err("Error: #{error.message}")
  if error.respond_to?(:reason)
    ui.err("Reason: #{error.reason}")
    ui.err("")
    ui.err(error.extended_error_info) if debug?
    ui.err(error.cause.backtrace.join("\n")) if debug?
  end
end

def initialize(*args)
  super
  @show_all_policies = nil
  @policy_name = nil
  @policy_group = nil
  @ui = UI.new
end

def run(params)
  return 1 unless apply_params!(params)
  show_policy_service.run
  0
rescue PolicyfileServiceError => e
  handle_error(e)
  1
end

def show_orphans?
  config[:show_orphans]
end

def show_policy_service
  @policy_list_service ||=
    PolicyfileServices::ShowPolicy.new(config: chef_config,
                                       ui: ui,
                                       policy_name: policy_name,
                                       policy_group: policy_group,
                                       show_orphans: show_orphans?,
                                       summary_diff: show_summary_diff?,
                                       pager: enable_pager?)
end

def show_summary_diff?
  false
end