class Samovar::Nested

def initialize(name, commands, key: :command, default: nil)
	@name = name
	@commands = commands
	@key = key
	
	# This is the default name [of a command], not the default command:
	@default = default
end

def parse(input, default)
	if command = @commands[input.first]
		input.shift
		
		# puts "Instantiating #{command} with #{input}"
		command.new(input)
	elsif @default
		default || @commands[@default].new(input)
	end
end

def to_a
	usage = [@name]
	
	if @commands.size == 0
		usage << "No commands available."
	elsif @commands.size == 1
		usage << "Only #{@commands.first}."
	else
		usage << "One of: #{@commands.keys.join(', ')}."
	end
	
	if @default
		usage << "Default: #{@default}"
	end
	
	return usage
end

def to_s
	@name
end

def usage(rows)
	rows << self
	
	@commands.each do |key, klass|
		klass.usage(rows, key)
	end
end