--!native
--!strict
--!optimize 2
local ServerProcess = {}

local RunService = game:GetService("RunService")
local Players = game:GetService("Players")
local Util = script.Parent.Parent.Util

local Type = require(script.Parent.Parent.Type)
local Event = require(script.Parent.Parent.Event)
local Spawn = require(Util.Spawn)
local Key = require(Util.Key)
local RateLimit = require(Util.RateLimit)
local Buffer = require(Util.Buffer)

local serverQueue: Type.QueueMap = {}
local unreliableServerQueue: Type.QueueMap = {}
local serverCallback: Type.CallbackMap = {}
local serverRequestQueue: Type.QueueMap = {}
local registeredIdentifier: { [string]: boolean } = {}

local queueOut: {
	[Player]: {
		[string]: {any},
	}
} = {}
local queueInRequest: {
	[number]: {
		[string]: {
			[Player]: {any}
		}
	}
} = {}
local queueOutRequest: {
	[number]: {
		[string]: {
			[Player]: {any}
		}
	}
} = {}

queueInRequest[1] = {}
queueInRequest[2] = {}
queueOutRequest[1] = {}
queueOutRequest[2] = {}

local ReliableEvent = Event.Reliable
local UnreliableEvent = Event.Unreliable
local RequestEvent = Event.Request

local function initializeEachPlayer(player: Player)
	if not player then return end
	if not queueOut[player] then
		queueOut[player] = {}
	end

	for _, Identifier: string in registeredIdentifier do
		if not player then break end
		if not queueOut[player][Identifier] then
			queueOut[player][Identifier] = {}
		end
		if not serverRequestQueue[Identifier] then
			serverRequestQueue[Identifier] = {}
		end
		if not serverRequestQueue[Identifier][player] then
			serverRequestQueue[Identifier][player] = {}
		end
		if not queueOutRequest[1][Identifier] then
			queueOutRequest[1][Identifier] = {}
		end
		if not queueOutRequest[2][Identifier] then
			queueOutRequest[2][Identifier] = {}
		end
		if not queueInRequest[1][Identifier][player] then
			queueInRequest[1][Identifier][player] = {}
			queueInRequest[2][Identifier][player] = {}
		end
		if not queueOutRequest[1][Identifier][player] then
			queueOutRequest[1][Identifier][player] = {}
			queueOutRequest[2][Identifier][player] = {}
		end
	end
end

Players.PlayerAdded:Connect(initializeEachPlayer)

function ServerProcess.insertQueue(Identifier: string, reliable: boolean, player: Player, ...: any)
	if not reliable then
		if not unreliableServerQueue[Identifier] then
			unreliableServerQueue[Identifier] = {}
		end
		if not unreliableServerQueue[Identifier][player] then
			unreliableServerQueue[Identifier][player] = {}
		end
		table.insert(unreliableServerQueue[Identifier][player], { ... })
		return
	end
	if not serverQueue[Identifier] then
		serverQueue[Identifier] = {}
	end
	if not serverQueue[Identifier][player] then
		serverQueue[Identifier][player] = {}
	end
	table.insert(serverQueue[Identifier][player], { ... })
end

function ServerProcess.insertRequest(Identifier: string, timeout: number, player: Player, ...: any)
	if not serverRequestQueue[Identifier] then
		serverRequestQueue[Identifier] = {}
	end
	if not serverRequestQueue[Identifier][player] then
		serverRequestQueue[Identifier][player] = {}
	end
	local yieldThread: thread, start = coroutine.running(), os.clock()
	local cancel = task.delay(timeout, function()
		task.spawn(yieldThread, nil)
	end)
	table.insert(serverRequestQueue[Identifier][player], { tostring(Key()), function(...: any)
		if (os.clock() - start) > timeout then return end
		task.cancel(cancel)
		task.spawn(yieldThread, ...)
	end :: any, { ... } :: any })
	return coroutine.yield()
end

function ServerProcess.add(Identifier: string, originId: string, conf: Type.ServerConf)
	if not registeredIdentifier[Identifier] then
		registeredIdentifier[Identifier] = true

		RateLimit.create(originId, conf.rateLimit and conf.rateLimit.maxEntrance or 200, conf.rateLimit and conf.rateLimit.interval or 2)

		if not serverQueue[Identifier] then
			serverQueue[Identifier] = {}
		end
		if not serverRequestQueue[Identifier] then
			serverRequestQueue[Identifier] = {}
		end
		if not serverCallback[Identifier] then
			serverCallback[Identifier] = {}
		end
		if not unreliableServerQueue[Identifier] then
			unreliableServerQueue[Identifier] = {}
		end

		if not queueInRequest[1][Identifier] then
			queueInRequest[1][Identifier] = {}
		end
		if not queueInRequest[2][Identifier] then
			queueInRequest[2][Identifier] = {}
		end
		if not queueOutRequest[1][Identifier] then
			queueOutRequest[1][Identifier] = {}
		end
		if not queueOutRequest[2][Identifier] then
			queueOutRequest[2][Identifier] = {}
		end

		for _, player: Player in ipairs(Players:GetPlayers()) do
			task.spawn(initializeEachPlayer, player)
		end
	end
end

function ServerProcess.remove(Identifier: string)
	if not registeredIdentifier[Identifier] then return end
	registeredIdentifier[Identifier] = nil
	serverQueue[Identifier] = nil
	serverRequestQueue[Identifier] = nil
	serverCallback[Identifier] = nil
	unreliableServerQueue[Identifier] = nil
	queueInRequest[1][Identifier] = nil
	queueInRequest[2][Identifier] = nil
	queueOutRequest[1][Identifier] = nil
	queueOutRequest[2][Identifier] = nil
end

function ServerProcess.addCallback(Identifier: string, key: string, callback)
	serverCallback[Identifier][key] = callback
end

function ServerProcess.removeCallback(Identifier: string, key: string)
	serverCallback[Identifier][key] = nil
end

function ServerProcess.start()
	debug.setmemorycategory("Warp")
	RunService.PostSimulation:Connect(function()
		-- Unreliable
		for Identifier: string, players in unreliableServerQueue do
			for player: Player, content: any in players do
				if #content == 0 then continue end
				for _, unpacked in content do
					UnreliableEvent:FireClient(player, Buffer.write(unpacked))
				end
				unreliableServerQueue[Identifier][player] = nil
			end
			unreliableServerQueue[Identifier] = nil
		end
		-- Reliable
		for Identifier: string, contents: { [Player]: { any } } in serverQueue do
			for player, content: any in contents do
				if #content > 0 and queueOut[player] then
					for _, unpacked in content do
						ReliableEvent:FireClient(player, Buffer.write(unpacked))
					end
				end
				serverQueue[Identifier][player] = nil
			end
			serverQueue[Identifier] = nil
		end
		-- Sent new invokes
		for Identifier: string, contents in queueOutRequest[1] do
			for player: Player, requestsData: any in contents do
				if #requestsData > 0 then
					RequestEvent:FireClient(player, Buffer.revert(Identifier), "\1", requestsData)
				end
				queueOutRequest[1][Identifier][player] = nil
			end
			queueOutRequest[1][Identifier] = nil
		end
		-- Sent returning invokes
		for Identifier: string, contents in queueOutRequest[2] do
			for player: Player, toReturnDatas: any in contents do
				if #toReturnDatas > 0 then
					RequestEvent:FireClient(player, Buffer.revert(Identifier), "\0", toReturnDatas)
				end
				queueOutRequest[2][Identifier][player] = nil
			end
			queueOutRequest[2][Identifier] = nil
		end
		
		for Identifier: string in registeredIdentifier do
			if serverRequestQueue[Identifier] then
				for player, content in serverRequestQueue[Identifier] do
					if #content == 0 then serverRequestQueue[Identifier][player] = nil continue end
					for _, requestData in content do
						if not requestData[3] then continue end
						if not queueOutRequest[1][Identifier] then
							queueOutRequest[1][Identifier] = {}
						end
						if not queueOutRequest[1][Identifier][player] then
							queueOutRequest[1][Identifier][player] = {}
						end
						table.insert(queueOutRequest[1][Identifier][player], { requestData[1], requestData[3] })
						requestData[3] = nil
					end
				end
			end

			local callback = serverCallback[Identifier] or nil
			if not callback then continue end

			-- Return Invoke
			for player, content in queueInRequest[1][Identifier] do
				if not callback then break end
				for _, packetDatas in content do
					if not callback then break end
					if #packetDatas == 0 then continue end
					for _, fn: any in callback do
						for i=1,#packetDatas do
							if not packetDatas[i] then continue end
							local packetData1 = packetDatas[i][1]
							local packetData2 = packetDatas[i][2]
							Spawn(function()
								local requestReturn = { fn(player, table.unpack(packetData2)) }
								if not queueOutRequest[2][Identifier] then
									queueOutRequest[2][Identifier] = {}
								end
								if not queueOutRequest[2][Identifier][player] then
									queueOutRequest[2][Identifier][player] = {}
								end
								table.insert(queueOutRequest[2][Identifier][player], { packetData1, requestReturn })
								packetData1 = nil
								packetData2 = nil
							end)
						end
					end
				end
				queueInRequest[1][Identifier][player] = nil
			end

			-- Call to Invoke
			for player, content in queueInRequest[2][Identifier] do
				if not callback then break end
				for _, packetDatas in content do
					for _, packetData in packetDatas do
						if not callback then break end
						if #packetData == 1 then continue end
						local data = serverRequestQueue[Identifier][player]
						for i=1,#data do
							local serverRequest = data[i]
							if not serverRequest then continue end
							if serverRequest[1] == packetData[1] then
								Spawn(serverRequest[2], table.unpack(packetData[2]))
								table.remove(data, i)
								break
							end
						end
					end
				end
				queueInRequest[2][Identifier][player] = nil
			end
		end
	end)
	local function onServerNetworkReceive(player: Player, data: buffer)
		if not data then return end
		local read = Buffer.read(data)
		if not read then return end
		for Identifier: string in registeredIdentifier do
			local callback = serverCallback[Identifier] or nil
			if not callback then continue end
			for _, fn: any in callback do
				Spawn(fn, player, table.unpack(read))
			end
		end
	end
	ReliableEvent.OnServerEvent:Connect(onServerNetworkReceive)
	UnreliableEvent.OnServerEvent:Connect(onServerNetworkReceive)
	RequestEvent.OnServerEvent:Connect(function(player: Player, Identifier: any, action: string, data: any)
		if not Identifier or not data then return end
		Identifier = Buffer.convert(Identifier)
		if not queueInRequest[1][Identifier][player] then
			queueInRequest[1][Identifier][player] = {}
		end
		if not queueInRequest[2][Identifier][player] then
			queueInRequest[2][Identifier][player] = {}
		end
		if not serverQueue[Identifier] then
			serverQueue[Identifier] = {}
		end
		if not serverQueue[Identifier][player] then
			serverQueue[Identifier][player] = {}
		end
		if action == "\1" then
			table.insert(queueInRequest[1][Identifier][player], data)
		else
			table.insert(queueInRequest[2][Identifier][player], data)
		end
	end)
end

for _, player: Player in ipairs(Players:GetPlayers()) do
	task.spawn(initializeEachPlayer, player)
end

return ServerProcess