--!strict
-- ReplicatedStorage/Shared/Net.luau
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local RunService = game:GetService("RunService")

local FOLDER_NAME = "Remotes"
local IS_SERVER = RunService:IsServer()

local folder: Instance
if IS_SERVER then
	folder = ReplicatedStorage:FindFirstChild(FOLDER_NAME) or Instance.new("Folder")
	folder.Name = FOLDER_NAME
	folder.Parent = ReplicatedStorage
else
	folder = ReplicatedStorage:WaitForChild(FOLDER_NAME)
end

local function get<T>(className: string, name: string): T
	if IS_SERVER then
		local existing = folder:FindFirstChild(name)
		if existing then
			return existing :: any
		end
		local remote = Instance.new(className)
		remote.Name = name
		remote.Parent = folder
		return remote :: any
	end
	return folder:WaitForChild(name) :: any
end

return {
	RequestPurchase = get("RemoteEvent", "RequestPurchase") :: RemoteEvent,
	InventoryChanged = get("RemoteEvent", "InventoryChanged") :: RemoteEvent,
	AimDirection = get("UnreliableRemoteEvent", "AimDirection") :: UnreliableRemoteEvent,
	GetShopStock = get("RemoteFunction", "GetShopStock") :: RemoteFunction,
}

--!strict
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local Net = require(ReplicatedStorage.Shared.Net)

local ITEM_PRICES: { [string]: number } = { Sword = 100, Shield = 150 }
local MIN_INTERVAL = 0.25
local lastRequest: { [Player]: number } = {}

Net.RequestPurchase.OnServerEvent:Connect(function(player: Player, itemId: unknown)
	local now = os.clock()
	if now - (lastRequest[player] or 0) < MIN_INTERVAL then
		return -- rate limited
	end
	lastRequest[player] = now

	if typeof(itemId) ~= "string" or #itemId > 64 then
		return -- malformed: never trust argument types
	end
	local price = ITEM_PRICES[itemId]
	if not price then
		return -- unknown item
	end
	-- check the player's server-side balance, deduct, grant, then notify:
	Net.InventoryChanged:FireClient(player, { added = itemId })
end)

game:GetService("Players").PlayerRemoving:Connect(function(player)
	lastRequest[player] = nil -- avoid leaking Player keys
end)

--!strict
-- Pack a hit notification into 11 bytes instead of a table with string keys.
local function encodeHit(targetId: number, damage: number, position: Vector3): buffer
	local b = buffer.create(11)
	buffer.writeu32(b, 0, targetId)
	buffer.writeu16(b, 4, math.clamp(math.round(damage), 0, 65535))
	buffer.writei16(b, 6, math.clamp(math.round(position.X), -32768, 32767))
	buffer.writei16(b, 8, math.clamp(math.round(position.Z), -32768, 32767))
	buffer.writeu8(b, 10, math.clamp(math.round(position.Y / 4), 0, 255))
	return b
end

local function decodeHit(b: buffer): (number, number, Vector3)
	return buffer.readu32(b, 0),
		buffer.readu16(b, 4),
		Vector3.new(buffer.readi16(b, 6), buffer.readu8(b, 10) * 4, buffer.readi16(b, 8))
end

print(decodeHit(encodeHit(42, 25, Vector3.new(10, 20, 30))))