Foundations, part 6

Algebra Level 4

$\large \left(\dfrac{i + \sqrt 3}{- i + \sqrt 3}\right)^{2020} + \left(\dfrac{i - \sqrt 3}{i + \sqrt 3}\right)^{2017} + 1 = \, ?$

Clarification: $i=\sqrt{-1}$ denotes the imaginary unit.