local player = game.Players.LocalPlayer
local UIS = game:GetService("UserInputService")
local RunService = game:GetService("RunService")

local character = player.Character or player.CharacterAdded:Wait()
local hrp = character:WaitForChild("HumanoidRootPart")

local flying = false
local speed = 80

local bv
local bg

function startFly()
	flying = true

	bv = Instance.new("BodyVelocity")
	bv.MaxForce = Vector3.new(1e5, 1e5, 1e5)
	bv.Parent = hrp

	bg = Instance.new("BodyGyro")
	bg.MaxTorque = Vector3.new(1e5, 1e5, 1e5)
	bg.Parent = hrp
end

function stopFly()
	flying = false
	if bv then bv:Destroy() end
	if bg then bg:Destroy() end
end

UIS.InputBegan:Connect(function(input, gp)
	if gp then return end

	if input.KeyCode == Enum.KeyCode.F then
		if flying then
			stopFly()
		else
			startFly()
		end
	end
end)

RunService.RenderStepped:Connect(function()
	if not flying then return end

	local cam = workspace.CurrentCamera
	local move = Vector3.zero

	if UIS:IsKeyDown(Enum.KeyCode.W) then
		move += cam.CFrame.LookVector
	end
	if UIS:IsKeyDown(Enum.KeyCode.S) then
		move -= cam.CFrame.LookVector
	end
	if UIS:IsKeyDown(Enum.KeyCode.A) then
		move -= cam.CFrame.RightVector
	end
	if UIS:IsKeyDown(Enum.KeyCode.D) then
		move += cam.CFrame.RightVector
	end
	if UIS:IsKeyDown(Enum.KeyCode.Space) then
		move += Vector3.new(0,1,0)
	end
	if UIS:IsKeyDown(Enum.KeyCode.LeftControl) then
		move -= Vector3.new(0,1,0)
	end

	bv.Velocity = move * speed
	bg.CFrame = cam.CFrame
end)