module Eco
  module Common
    class MetaThor
      class CommandUnit
        class << self

        end

        attr_reader :group, :index
        attr_reader :pipe
        attr_reader :args, :source_args
        attr_accessor :output

        def initialize(args:, group:, index:)
          @source_args = args.dup || []
          @args = @source_args
          @args = @args.slice(1..-1) if Pipe.piped?(@source_args)
          @pipe = Pipe.new(command: self) if Pipe.piped?(@source_args)

          @group = group
          @index = index
        end

        def piped?
          !!@pipe
        end

        def input
          pipe&.input
        end

        def args
          arguments = @args.dup
          arguments = yield(arguments) if block_given?
          arguments
        end

        def piped_args
          args.tap do |arguments|
            arguments = yield(arguments) if block_given?
            arguments.push(pipe.input.as_input_option) if piped?
          end
        end

      end
    end
  end
end