nosurf

if CLIENT then return end

nosurf_enabled = CreateConVar("nosurf_enabled", "1", {FVCAR_REPLICATED, FCVAR_ARCHIVE}, "Should we reprimand players for trying to propsurf?")
nosurf_admins = CreateConVar("nosurf_admins", "1", {FVCAR_REPLICATED, FCVAR_ARCHIVE}, "Should we also reprimand admins?")
nosurf_maxspeed = CreateConVar("nosurf_maxspeed", "128", {FVCAR_REPLICATED, FCVAR_ARCHIVE}, "How fast should they have to be travelling to be killed?")
nosurf_message = CreateConVar("nosurf_message", "nosurf | Propsurfing is not allowed.", {FVCAR_REPLICATED, FCVAR_ARCHIVE}, "What should they see in chat when they're killed?")

hook.Add("PhysgunPickup", "nosurf", function(ply, ent) ply.nosurf = ent end)
hook.Add("PhysgunDrop", "nosurf", function(ply) ply.nosurf = nil end)

local function nosurf_handle(ent, data)
    local delta = data.DeltaTime
    local ent2 = data.HitEntity

    if not (IsValid(ent2) and ent2:IsPlayer()) then return end

    local normal = data.HitNormal
    local speed = (ent2:GetVelocity() - data.TheirOldVelocity):Length()
    local speed2 = data.Speed

    if (nosurf_admins:GetBool() and ent2:IsAdmin()) or not ent2:IsAdmin() then
        if speed2 > nosurf_maxspeed:GetInt() or speed > nosurf_maxspeed:GetInt() then
            if IsValid(ent2.nosurf) and (ent2.nosurf == ent) and not ent:IsOnGround() then
                local stop = hook.Call("PropSurfed", GM or  GAMEMODE, v, aim)

                if not stop then
                    ent2:Kill()
                    ent2:ChatPrint(nosurf_message:GetString())
                end
            end
        end
    end
end

hook.Add("OnEntityCreated", "nosurf", function(ent)
    if IsValid(ent) and not ent:IsPlayer() then
        ent:AddCallback("PhysicsCollide", nosurf_handle)
    end
end)