Weapon that changes your bodygroups

[Sijay]

Hi, i'm using this code to make weapon but it is not working.
In my opinion the problem is in the last function that actually change your bodygroups. What function should i use to do like after clicking left mouse button on weapon it changes your bodygroups? And is it possible to make weapon change bodygroup by clicking LMB and then by clicking RMB it will change your bodygroup to first?
AddCSLuaFile()

if CLIENT then
SWEP.PrintName            = "Weapon"            
SWEP.Slot                = 2
SWEP.SlotPos            = 0
SWEP.DrawCrosshair        = false
end

SWEP.Author        = "Author"
SWEP.Contact        = ""
SWEP.Purpose        = "..."
SWEP.Instructions    = ""

SWEP.ViewModel        = "models/props_lab/clipboard.mdl"
SWEP.WorldModel        = "models/props_lab/clipboard.mdl"

SWEP.Weight                = 5
SWEP.AutoSwitchTo        = false
SWEP.AutoSwitchFrom        = false
SWEP.HoldType            = "normal"
SWEP.AnimPrefix = "normal"

SWEP.Spawnable            = true
SWEP.AdminSpawnable        = true
SWEP.Category = "Other"

SWEP.Primary.ClipSize        = -1
SWEP.Primary.DefaultClip    = -1
SWEP.Primary.Automatic        = false
SWEP.Primary.Ammo            = "none"

SWEP.Secondary.ClipSize        = -1
SWEP.Secondary.DefaultClip    = -1
SWEP.Secondary.Automatic    = false
SWEP.Secondary.Ammo            = "none"

function SWEP:Initialize()
    self:SetHoldType( "normal" )
end

function SWEP:Deploy()
    if CLIENT then
        if IsValid(LocalPlayer())then
               local Viewmodel = LocalPlayer():GetViewModel()

            if IsValid(Viewmodel) then
                Viewmodel:SetMaterial("models/clipboard")
            end
        end
    end
    return true    
end

function SWEP:Holster()
    if CLIENT then
        if IsValid(LocalPlayer()) then
                  local Viewmodel = LocalPlayer():GetViewModel()

            if IsValid(Viewmodel) then
                Viewmodel:SetMaterial("")
            end
        end
    end
    return true
end

function SWEP:PrimaryAttack()    
    if SERVER then
        Player = function(ply)
   ply:SetBodygroup(1,0)
   ply:SetBodygroup(2,4)
   ply:SetBodygroup(3,0)
     end
   end
 end

[Kingof🅱east]

[lua]function SWEP:PrimaryAttack()    
    if SERVER then
        local ply = self.Owner
        ply:SetBodygroup(1,0)
        ply:SetBodygroup(2,4)
        ply:SetBodygroup(3,0)
    end
end[/lua]