local Config = {
    ms = 0.08,
    ttl = 0.005, -- i forgot what does it do :<
    MinHeight = 3, -- height in studs that auto perfect land can work
}

local RunService = game:GetService("RunService")
local VirtualInputManager = game:GetService("VirtualInputManager")

local LocalPlayer = game:GetService("Players").LocalPlayer

repeat task.wait() until LocalPlayer.Backpack and LocalPlayer.Backpack:FindFirstChild("Main")

local env = getsenv(LocalPlayer.Backpack.Main)
if not env then return end

local falling = false
local shiftPressed = false
local fallY = 0
local conn = nil
local releaseTask = nil

local function pressShift()
    if shiftPressed then return end
    pcall(function()
        VirtualInputManager:SendKeyEvent(true, Enum.KeyCode.LeftShift, false, game)
        shiftPressed = true
    end)
end

local function releaseShift()
    if releaseTask then
        pcall(function()
            task.cancel(releaseTask)
        end)
        releaseTask = nil
    end
    if shiftPressed then
        pcall(function()
            VirtualInputManager:SendKeyEvent(false, Enum.KeyCode.LeftShift, false, game)
            shiftPressed = false
        end)
    end
end

local function cleanup()
    if conn then 
        pcall(conn.Disconnect, conn) 
        conn = nil
    end
    if releaseTask then
        pcall(function()
            task.cancel(releaseTask)
        end)
        releaseTask = nil
    end
    releaseShift()
    falling = false
    fallY = 0
end

local function setup(Char)
    cleanup()
    
    local Humanoid = Char:FindFirstChild("Humanoid")
    local Root = Char:FindFirstChild("HumanoidRootPart")
    if not Humanoid or not Root then return end
    
    Humanoid.BreakJointsOnDeath = false
    
    conn = RunService.Heartbeat:Connect(function()
        if not Char.Parent then
            cleanup()
            return
        end
        
        if Humanoid.Health <= 0 then
            releaseShift()
            falling = false
            return
        end
        
        local state = Humanoid:GetState()
        local inAir = state == Enum.HumanoidStateType.Freefall or state == Enum.HumanoidStateType.Jumping
        local onGround = state == Enum.HumanoidStateType.Running or 
                        state == Enum.HumanoidStateType.RunningNoPhysics or 
                        state == Enum.HumanoidStateType.Landed
        
        local goingDown = Root.AssemblyLinearVelocity.Y < -1
        
        if inAir and goingDown and not falling then
            falling = true
            fallY = Root.Position.Y
        end
        
        if falling then
            local params = RaycastParams.new()
            params.FilterType = Enum.RaycastFilterType.Exclude
            params.FilterDescendantsInstances = {Char, workspace.RaycastIgnore}
            
            local result = workspace:Raycast(Root.Position, Vector3.new(0, -50, 0), params)
            
            if result then
                local dist = Root.Position.Y - result.Position.Y
                local speed = math.abs(Root.AssemblyLinearVelocity.Y)
                local height = fallY - Root.Position.Y
                
                if speed > 1 and height > Config.MinHeight then
                    local timeToLand = dist / speed
                    
                    if timeToLand < Config.ms and timeToLand > Config.ttl and not shiftPressed then
                        pressShift()
                        
                        if env.v49 then env.v49 = 0 end
                        if env.t7 and env.t7.Landing then
                            pcall(function()
                                env.t7.Landing.FallDamageOverride = true
                                env.t7.Landing.ForceDampen = true
                            end)
                        end
                    end
                elseif shiftPressed and height < 3 then
                    releaseShift()
                end
            end
        end
        
        if onGround and falling then
            falling = false
            fallY = 0
            if shiftPressed then
                -- Создаем новую задачу только если нет активной
                if not releaseTask then
                    releaseTask = task.delay(0.3, function()
                        releaseShift()
                        releaseTask = nil
                    end)
                end
            end
        end
        
        if not inAir and not onGround and falling then
            falling = false
            fallY = 0
            if shiftPressed then
                if not releaseTask then
                    releaseTask = task.delay(0.3, function()
                        releaseShift()
                        releaseTask = nil
                    end)
                end
            end
        end
    end)
end

LocalPlayer.CharacterAdded:Connect(function(Char)
    task.wait(0.5)
    setup(Char)
end)

if LocalPlayer.Character then
    task.wait(0.5)
    setup(LocalPlayer.Character)
end