How can there be Happiness without suffering?
Light vs darkness is a better analogy to wisdom vs ignorance than happiness vs suffering. What you describe as happiness and suffering are just experiences. They belong to the Sankhara group in the five aggregates of clinging. Nibbana exists independently of the five aggregates. All experiences, whether they are pleasurable, painful or neutral, fall under the first Noble truth. So they all have the inherent nature of Dukkha. Nibbana is non-experiential and devoid of Dukkha.