::* if episode is in "resume" (watched), that episode is returned as "next"
::* if episode is "completed", it returns the next available episode (next one within season or first one of next season)
::* if there is not available (new) episode, it does not return anything returns the "last wached" episode, with -1 (''completed'') for ResumeValue (Series Completed; meaning that series is completed so far)
::* if there is not any episode already watched, it returns the available episode with highest Season and Episode
::*etc