The democracy index for Spain has been on the free fall for some years now. Whether Spain will return to a democratic approach to resolving civic and political issues rather than the current authoritarian approach that curtails civil freedoms for all Spaniards--not just Catalans--remains to be seen.
As for Tsunami Democratic, I'm afraid news reports haven't been fair. The disorders and criminal activities--which by the way the Spanish courts are labeling as "terrorism" despite any evidence--have been, by and large, carried out by infiltrated police agents. There is plenty of video footage online demonstrating case after case of police agents dressed as demonstrators, emerging from police vans in a side alley, joining a demonstration and engaging in deplorable behavior.