class Samovar::Option

def coerce(result)
	if @type
		result = coerce_type(result)
	end
	
	if @block
		result = @block.call(result)
	end
	
	return result
end

def coerce_type(result)
	if @type == Integer
		Integer(result)
	elsif @type == Float
		Float(result)
	elsif @type == Symbol
		result.to_sym
	elsif @type.respond_to? :call
		@type.call(result)
	elsif @type.respond_to? :new
		@type.new(result)
	end
end

def initialize(flags, description, key: nil, default: nil, value: nil, type: nil, required: false, &block)
	@flags = Flags.new(flags)
	@description = description
	
	if key
		@key = key
	else
		@key = @flags.first.key
	end
	
	@default = default
	
	# If the value is given, it overrides the user specified input.
	@value = value
	@value ||= true if @flags.boolean?
	
	@type = type
	@required = required
	@block = block
end

def parse(input, parent = nil, default = nil)
	result = @flags.parse(input)
	if result != nil
		@value.nil? ? coerce(result) : @value
	elsif default ||= @default
		return default
	elsif @required
		raise MissingValueError.new(parent, self)
	end
end

def to_a
	if @default
		[@flags, @description, "(default: #{@default})"]
	elsif @required
		[@flags, @description, "(required)"]
	else
		[@flags, @description]
	end
end

def to_s
	@flags
end