class IO::Endpoint::SharedEndpoint

def self.bound(endpoint, backlog: Socket::SOMAXCONN, close_on_exec: false, **options)
	sockets = []
	
	endpoint.each do |server_endpoint|
		server = server_endpoint.bind(**options)
		
		# This is somewhat optional. We want to have a generic interface as much as possible so that users of this interface can just call it without knowing a lot of internal details. Therefore, we ignore errors here if it's because the underlying socket does not support the operation.
		begin
			server.listen(backlog)
		rescue Errno::EOPNOTSUPP
			# Ignore.
		end
		
		server.close_on_exec = close_on_exec
		
		sockets << server
	end
	
	return self.new(endpoint, sockets)
end

def self.connected(endpoint, close_on_exec: false)
	wrapper = endpoint.connect
	
	wrapper.close_on_exec = close_on_exec
	
	return self.new(endpoint, [wrapper])
end

def accept(**options, &block)
	bind do |server|
		server.accept(&block)
	end
end

def bind(wrapper = Wrapper.default, &block)
	@sockets.each.map do |server|
		server = server.dup
		
		if block_given?
			wrapper.async do
				begin
					yield server
				ensure
					server.close
				end
			end
		else
			server
		end
	end
end

def close
	@sockets.each(&:close)
	@sockets.clear
end

def connect(wrapper = Wrapper.default, &block)
	@sockets.each do |socket|
		socket = socket.dup
		
		return socket unless block_given?
		
		begin
			return yield(socket)
		ensure
			socket.close
		end
	end
end

def each(&block)
	return to_enum unless block_given?
	
	@sockets.each do |socket|
		yield SocketEndpoint.new(socket.dup)
	end
end

def initialize(endpoint, sockets, **options)
	super(**options)
	
	raise TypeError, "sockets must be an Array" unless sockets.is_a?(Array)
	
	@endpoint = endpoint
	@sockets = sockets
end

def local_address_endpoint(**options)
	endpoints = @sockets.map do |wrapper|
		AddressEndpoint.new(wrapper.to_io.local_address)
	end
	
	return CompositeEndpoint.new(endpoints, **options)
end

def remote_address_endpoint(**options)
	endpoints = @sockets.map do |wrapper|
		AddressEndpoint.new(wrapper.to_io.remote_address)
	end
	
	return CompositeEndpoint.new(endpoints, **options)
end

def to_s
	"\#<#{self.class} #{@sockets.size} descriptors for #{@endpoint}>"
end