hook.Add("KeyPress", "surface_sit", function(ply, key)
    if not ply:GetVehicle():IsValid() and key == IN_USE and ply:KeyDown(IN_WALK) then
        local trace = util.QuickTrace(ply:EyePos(), ply:GetAimVector() * 100, ply)

        if trace.Hit and not trace.Entity:IsPlayer() and not trace.Entity:IsNPC() then

            local angle = trace.HitNormal:Angle()
            angle:RotateAroundAxis(angle:Up(), 90)
            angle:RotateAroundAxis(angle:Forward(), 90)

            angle:RotateAroundAxis(trace.HitNormal, math.AngleDifference(ply:EyeAngles().y, 180))

            print(math.Round(angle.p), math.Round(angle.y), math.Round(angle.r))

            --if math.abs(angle.r) > 45 then return end

            local ent = ents.Create("weapon_seat")

            ent:SetModel("models/nova/airboat_seat.mdl")
            ent:SetPos(trace.HitPos - (trace.HitNormal * 2))
            ent:SetAngles(angle)

            ent.up_offset = 43.5
            ent.right_offset = 1.75
            ent.forward_offset = 0
            ent.surface_sit = true

            ent:Spawn()

            ent:SetStoolSeat(true)

            ply:EnterVehicle(ent)

            if trace.Entity:IsValid() and not trace.Entity:IsWorld() then
                ent:GetPhysicsObject():EnableMotion(true)
                constraint.Weld(trace.Entity, ent, 0, 0, 0, true)
                trace.Entity:CallOnRemove("surface_sit"..ply:UniqueID(), function()
                    if ent:IsVehicle() then
                        ent:Remove()
                    end
                end)
            else
                ent:SetMoveType(MOVETYPE_NONE)
            end

        end
    end
end)

hook.Add("PlayerLeaveVehicle", "surface_sit", function(ply, ent)
    if ent.surface_sit  then
        ent:Remove()
    end
end)