# frozen_string_literal: true

# Released under the MIT License.
# Copyright, 2018-2025, by Samuel Williams.
# Copyright, 2020, by Igor Sidorov.

require "async"
require "async/variable"
require "async/clock"
require "async/http/client"
require "async/http/server"
require "async/http/endpoint"
require "async/http/body/hijack"
require "tempfile"

require "protocol/http/body/file"
require "protocol/http/body/buffered"

require "sus/fixtures/async/http"

module Async
	module HTTP
		AProtocol = Sus::Shared("a protocol") do
			include Sus::Fixtures::Async::HTTP::ServerContext
			
			let(:protocol) {subject}
			
			it "should have valid scheme" do
				expect(client.scheme).to be == "http"
			end
			
			with "#close" do
				it "can close the connection" do
					Async do |task|
						response = client.get("/")
						expect(response).to be(:success?)
						response.finish
						
						client.close
						
						expect(task.children).to be(:empty?)
					end.wait
				end
			end
			
			with "interim response" do
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						request.send_interim_response(103, [["link", "</style.css>; rel=preload; as=style"]])
						
						::Protocol::HTTP::Response[200, {}, ["Hello World"]]
					end
				end
				
				it "can read informational response" do
					called = false
					
					callback = proc do |status, headers|
						called = true
						expect(status).to be == 103
						expect(headers).to have_keys(
							"link" => be == ["</style.css>; rel=preload; as=style"]
						)
					end
					
					response = client.get("/", interim_response: callback)
					expect(response).to be(:success?)
					expect(response.read).to be == "Hello World"
					
					expect(called).to be == true
				end
			end
			
			with "huge body" do
				let(:body) {::Protocol::HTTP::Body::File.open("/dev/zero", size: 8*1024**2)}
				
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						::Protocol::HTTP::Response[200, {}, body]
					end
				end
				
				it "client can download data quickly" do
					response = client.get("/")
					expect(response).to be(:success?)
					
					data_size = 0
					duration = Async::Clock.measure do
						while chunk = response.body.read
							data_size += chunk.bytesize
							chunk.clear
						end
						
						response.finish
					end
					
					size_mbytes = data_size / 1024**2
					
					inform "Data size: #{size_mbytes}MB Duration: #{duration.round(2)}s Throughput: #{(size_mbytes / duration).round(2)}MB/s"
				end
			end
			
			with "buffered body" do
				let(:body) {::Protocol::HTTP::Body::Buffered.new(["Hello World"])}
				let(:response) {::Protocol::HTTP::Response[200, {}, body]}
				
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						response
					end
				end
				
				it "response body should be closed" do
					expect(body).to receive(:close)
					# expect(response).to receive(:close)
					
					expect(client.get("/", {}).read).to be == "Hello World"
				end
			end
			
			with "empty body" do
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						::Protocol::HTTP::Response[204]
					end
				end
				
				it "properly handles no content responses" do
					expect(client.get("/", {}).read).to be_nil
				end
			end
			
			with "with request trailer" do
				let(:request_received) {Async::Variable.new}
				
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						if trailer = request.headers["trailer"]
							expect(request.headers).not.to have_keys("etag")
							
							request_received.value = true
							request.finish
							
							expect(request.headers).to have_keys("etag")
							
							::Protocol::HTTP::Response[200, [], "request trailer"]
						else
							::Protocol::HTTP::Response[400, headers, body]
						end
					end
				end
				
				it "can send request trailer" do
					skip "Protocol does not support trailers!" unless subject.bidirectional?
					
					headers = ::Protocol::HTTP::Headers.new
					headers.add("trailer", "etag")
					body = Async::HTTP::Body::Writable.new
					
					Async do |task|
						body.write("Hello")
						
						request_received.wait
						headers.add("etag", "abcd")
						
						body.close_write
					end
					
					response = client.post("/", headers, body)
					expect(response.read).to be == "request trailer"
					expect(response).to be(:success?)
				end
			end
			
			with "with response trailer" do
				let(:response_received) {Async::Variable.new}
				
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						headers = ::Protocol::HTTP::Headers.new
						headers.add("trailer", "etag")
						
						body = Async::HTTP::Body::Writable.new
						
						Async do |task|
							body.write("response trailer")
							
							response_received.wait
							headers.add("etag", "abcd")
							
							body.close_write
						end
						
						::Protocol::HTTP::Response[200, headers, body]
					end
				end
				
				it "can receive response trailer" do
					skip "Protocol does not support trailers!" unless subject.bidirectional?
					
					response = client.get("/")
					expect(response.headers).to have_keys("trailer")
					headers = response.headers
					expect(headers).not.to have_keys("etag")
					
					response_received.value = true
					
					expect(response.read).to be == "response trailer"
					expect(response).to be(:success?)
					
					# It was sent as a trailer.
					expect(headers).to have_keys("etag")
				end
			end
			
			with "with working server" do
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						if request.method == "POST"
							# We stream the request body directly to the response.
							::Protocol::HTTP::Response[200, {}, request.body]
						elsif request.method == "GET"
							expect(request.body).to be_nil
							
							::Protocol::HTTP::Response[200, {"my-header" => "my-value"}, ["#{request.method} #{request.version}"]]
						else
							::Protocol::HTTP::Response[200, {}, ["Hello World"]]
						end
					end
				end
				
				def endpoint_options
					# Add a timeout to ensure that slow clients are disconnected:
					super.merge(timeout: 0.5)
				end
				
				it "should have valid scheme" do
					expect(server.scheme).to be == "http"
				end
				
				it "disconnects slow clients" do
					response = client.get("/")
					response.read
					
					# We expect this connection to be closed:
					connection = response.connection
					
					reactor.sleep(1.0)
					
					response = client.get("/")
					response.read
					
					expect(connection).not.to be(:reusable?)
					
					# client.close
					# reactor.sleep(0.1)
					# reactor.print_hierarchy
				end
				
				with "using GET method" do
					let(:expected) {"GET #{protocol::VERSION}"}
					
					it "can handle many simultaneous requests" do
						duration = Async::Clock.measure do
							10.times do
								tasks = 100.times.collect do
									Async do
										client.get("/")
									end
								end
								
								tasks.each do |task|
									response = task.wait
									expect(response).to be(:success?)
									expect(response.read).to be == expected
								end
							end
						end
						
						inform "Pool: #{client.pool}"
						inform "Duration: #{duration.round(2)}"
					end
					
					with "with response" do
						let(:response) {client.get("/")}
						
						after do
							response.finish
						end
						
						it "can finish gracefully" do
							expect(response).to be(:success?)
						end
						
						it "is successful" do
							expect(response).to be(:success?)
							expect(response.read).to be == expected
						end
						
						it "provides content length" do
							expect(response.body.length).not.to be_nil
						end
						
						it "can save to disk" do
							Tempfile.open do |tempfile|
								response.save(tempfile.path)
								expect(tempfile.read).to be == expected
								tempfile.close!
							end
						end
						
						it "has response header" do
							expect(response.headers["my-header"]).to be == ["my-value"]
						end
						
						it "has protocol version" do
							expect(response.version).not.to be_nil
						end
					end
				end
				
				with "HEAD" do
					let(:response) {client.head("/")}
					
					it "is successful and without body" do
						expect(response).to be(:success?)
						expect(response.body).not.to be_nil
						expect(response.body).to be(:empty?)
						expect(response.body.length).not.to be_nil
						expect(response.read).to be_nil
					end
				end
				
				with "POST" do
					let(:response) {client.post("/", {}, ["Hello", " ", "World"])}
					
					after do
						response.finish
					end
					
					it "is successful" do
						expect(response).to be(:success?)
						expect(response.read).to be == "Hello World"
						expect(client.pool).not.to be(:busy?)
					end
					
					it "can buffer response" do
						buffer = response.finish
						
						expect(buffer.join).to be == "Hello World"
						
						expect(client.pool).not.to be(:busy?)
					end
					
					it "should not contain content-length response header" do
						expect(response.headers).not.to have_keys("content-length")
					end
					
					it "fails gracefully when closing connection" do
						client.pool.acquire do |connection|
							connection.stream.close
						end
					end
				end
			end
			
			with "content length" do
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						::Protocol::HTTP::Response[200, [], ["Content Length: #{request.body.length}"]]
					end
				end
				
				it "can send push promises" do
					response = client.post("/test", [], ["Hello World!"])
					expect(response).to be(:success?)
					
					expect(response.body.length).to be == 18
					expect(response.read).to be == "Content Length: 12"
				end
			end
			
			with "hijack with nil response" do
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						nil
					end
				end
				
				it "fails with appropriate error" do
					response = client.get("/")
					
					expect(response).to be(:server_failure?)
				end
			end
			
			with "partial hijack" do
				let(:content) {"Hello World!"}
				
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						Async::HTTP::Body::Hijack.response(request, 200, {}) do |stream|
							stream.write(content)
							stream.write(content)
							stream.close_write
						end
					end
				end
				
				it "reads hijacked body" do
					response = client.get("/")
					
					expect(response.read).to be == (content*2)
				end
			end
			
			with "body with incorrect length" do
				let(:bad_body) {::Protocol::HTTP::Body::Buffered.new(["Borked"], 10)}
				
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						::Protocol::HTTP::Response[200, {}, bad_body]
					end
				end
				
				it "fails with appropriate error" do
					response = client.get("/")
					
					expect do
						response.read
					end.to raise_exception(EOFError)
				end
			end
			
			with "streaming server" do
				let(:sent_chunks) {[]}
				
				let(:app) do
					chunks = sent_chunks
					
					::Protocol::HTTP::Middleware.for do |request|
						body = Async::HTTP::Body::Writable.new
						
						Async::Reactor.run do |task|
							10.times do |i|
								chunk = "Chunk #{i}"
								chunks << chunk
								
								body.write chunk
								sleep 0.25
							end
							
							body.finish
						end
						
						::Protocol::HTTP::Response[200, {}, body]
					end
				end
				
				it "can cancel response" do
					response = client.get("/")
					
					expect(response.body.read).to be == "Chunk 0"
					
					response.close
					
					expect(sent_chunks).to be == ["Chunk 0"]
				end
			end
			
			with "hijack server" do
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						if request.hijack?
							io = request.hijack!
							io.write "HTTP/1.1 200 Okay\r\nContent-Length: 16\r\n\r\nHijack Succeeded"
							io.flush
							io.close
						else
							::Protocol::HTTP::Response[200, {}, ["Hijack Failed"]]
						end
					end
				end
				
				it "will hijack response if possible" do
					response = client.get("/")
					
					expect(response.read).to be =~ /Hijack/
				end
			end
			
			with "broken server" do
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						raise RuntimeError.new("simulated failure")
					end
				end
				
				it "can't get /" do
					expect do
						response = client.get("/")
					end.to raise_exception(Exception)
				end
			end
			
			with "slow server" do
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						sleep(endpoint.timeout * 2)
						::Protocol::HTTP::Response[200, {}, []]
					end
				end
				
				def endpoint_options
					super.merge(timeout: 0.5)
				end
				
				it "can't get /" do
					expect do
						response = client.get("/")
					ensure
						response&.close
					end.to raise_exception(::IO::TimeoutError)
				end
			end
			
			with "bi-directional streaming" do
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						# Echo the request body back to the client.
						::Protocol::HTTP::Response[200, {}, request.body]
					end
				end
				
				it "can read from request body and write response body simultaneously" do
					skip "Protocol does not support bidirectional streaming!" unless subject.bidirectional?
					
					body = Async::HTTP::Body::Writable.new
					
					# Ideally, the flow here is as follows:
					# 1/ Client writes headers to server.
					# 2/ Client starts writing data to server (in async task).
					# 3/ Client reads headers from server.
					# 4a/ Client reads data from server.
					# 4b/ Client finishes sending data to server.
					response = client.post(endpoint.path, [], body)
					
					expect(response).to be(:success?)
					
					body.write "."
					count = 0
					
					response.each do |chunk|
						if chunk.bytesize > 32
							body.close
						else
							count += 1
							body.write chunk*2
							Async::Task.current.sleep(0.1)
						end
					end
					
					expect(count).to be == 6
				end
			end
			
			with "multiple client requests" do
				let(:app) do
					::Protocol::HTTP::Middleware.for do |request|
						::Protocol::HTTP::Response[200, {}, [request.path]]
					end
				end
				
				it "doesn't cancel all requests" do
					task = Async::Task.current
					tasks = []
					stopped = []
					
					10.times do
						task.async do |child|
							tasks << child
							
							loop do
								response = client.get("/a")
								response.finish
							ensure
								response&.close
							end
						ensure
							stopped << "a"
						end
					end
					
					10.times do
						task.async do |child|
							tasks << child
							
							loop do
								response = client.get("/b")
								response.finish
							ensure
								response&.close
							end
						ensure
							stopped << "b"
						end
					end
					
					tasks.each do |child|
						sleep 0.01
						child.stop
						child.wait
					end
					
					expect(stopped.sort).to be == stopped
				end
			end
		end
	end
end