-- Services
local UserInputService = game:GetService("UserInputService")
local Players = game:GetService("Players")

-- Variables
local Helicopter = script.Parent.Parent.Parent
local Heli = Helicopter.Helicopter
local GyroScope = script.Parent
local Thrust = Heli:FindFirstChild("BodyThrust")
local Reaction = Heli:FindFirstChild("BodyReaction")
local Force = Heli:FindFirstChild("BodyVelocity")
local AngularVelocity = Heli:FindFirstChild("BodyAngularVelocity")

-- Physics Variables
local m = Heli:GetMass()
local g =  workspace.Gravity
local cf = CFrame.new()
local vector = Vector3.new()
local MaxForce = m^2*4

-- Other
local enum = Enum.KeyCode
local turnSpeedPerSecond = 1

local turnAngle = 0

-- This is like loop and runs every Frame
game:GetService("RunService").Stepped:Connect(function (timeSinceLastFrame)


    local T = UserInputService:IsKeyDown(enum.T) and 1 or 0
    local G = UserInputService:IsKeyDown(enum.G) and 1 or 0
    local R = UserInputService:IsKeyDown(enum.R) and 1 or 0
    local Y = UserInputService:IsKeyDown(enum.Y) and 1 or 0
    local F = UserInputService:IsKeyDown(enum.F) and 1 or 0
    local H = UserInputService:IsKeyDown(enum.H) and 1 or 0
    local J = UserInputService:IsKeyDown(enum.J) and 1 or 0
    local LeftShift = UserInputService:IsKeyDown(enum.LeftShift) and 1 or 0

    turnAngle = turnAngle + (F - H) * turnSpeedPerSecond * timeSinceLastFrame
    local direction = Vector3.new(R - Y, J - LeftShift, T - G).Unit
    local m = direction.Magnitude

    -- Reaction Force
    Thrust.Force = Vector3.new(0, 9.01*m*g, 0)
    Reaction.Force = -Vector3.new(0, 8*m*g, 0)

    -- Friction/Resistance
    Heli.Velocity = Heli.Velocity - Heli.Velocity/10

    -- adding Force/CFrame values
    GyroScope.CFrame = CFrame.Angles(0, math.rad(turnAngle), 0)

    if m == m then

        Force.Velocity = (CFrame.Angles(0, turnAngle, 0) * CFrame.new(direction)).p
    else

        Force.Velocity = Vector3.new()
    end

end)