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So don't worry so much about how to use  had had  as a unit of grammar, they will come together naturally when you want to express the verb ' to have ' in the past perfect. Let's consider a different verb for a moment like  to want .
I know that in English language itself, people use the word âgoodbyeâ in distinctive ways. Some people say it when you leave someone for seeing them later, other as a definitive leave. In case of Portuguese, you can use in distinctive situations: AtÃ© Logo (literally: âUntil soonâ) - Employed when you know you are going to see the other person soon (like with a class or workmate).