function imp:choose_mood()
    if self.mood==self.moods.stop then return end
    if self.timers.mood<=0 then
        self.mood=self.moods[math.random(2)+1] -- chase o avoid
        self:reset_mood_timer()
    end
end

function imp:reset_mood_timer( value ) -- OK
if DEBUG_FN_NAME then print("reset_mood_timer") end
    value = value or 150
    self.timers.mood = value
    return value
end