# Copyright, 2017, by Samuel G. D. Williams. <http://www.codeotaku.com>
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RSpec.describe Async::Reactor do
	# Shared port for localhost network tests.
	let(:port) {6779}
	
	def run_echo_server
		# Accept a single incoming connection and then finish.
		subject.async(server) do |server, task|
			task.with(server.accept) do |peer|
				data = peer.read(512)
				peer.write(data)
			end
		end
		
		yield
		
		subject.run
		
		server.close
	end
	
	describe 'basic tcp server' do
		# These may block:
		let(:server) {TCPServer.new("localhost", port)}
		let(:client) {TCPSocket.new("localhost", port)}
		
		let(:data) {"The quick brown fox jumped over the lazy dog."}
		
		it "should start server and send data" do
			run_echo_server do
				subject.with(client) do |client|
					client.write(data)
					expect(client.read(512)).to be == data
				end
			end
			
			expect(client).to be_closed
		end
	end
	
	describe 'non-blocking tcp connect' do
		# These may block:
		let(:server) {TCPServer.new("localhost", port)}
		
		let(:data) {"The quick brown fox jumped over the lazy dog."}
		
		it "should start server and send data" do
			run_echo_server do
				subject.async do |task|
					Async::TCPSocket.connect("localhost", port) do |client|
						client.write(data)
						expect(client.read(512)).to be == data
					end
				end
			end
		end
		
		it "can connect socket and read/write in a different task" do
			socket = nil
			
			run_echo_server do
				subject.async do |task|
					socket = Async::TCPSocket.connect("localhost", port)
					
					# Stop the reactor once the connection was made.
					subject.stop
				end
			
				subject.run
				
				expect(socket).to_not be_nil
				
				subject.async(socket) do |client|
					client.write(data)
					expect(client.read(512)).to be == data
				end
				
				subject.run
			end
		end
		
		it "can't use a socket in nested tasks" do
			socket = nil
			
			run_echo_server do
				subject.async do |task|
					socket = Async::TCPSocket.connect("localhost", port)
					
					# I'm not sure if this is the right behaviour or not. Without a significant amont of work, async sockets are tied to the task that creates them.
					expect do
						subject.async(socket) do |client|
							client.write(data)
							expect(client.read(512)).to be == data
						end
					end.to raise_error(ArgumentError, /already registered with selector/)
				end
			end
		end
	end
end