Focus-time blocker that watches your calendar density

My calendar fills up meeting-by-meeting until there's no room left to actually think. I want a tool that looks at my Google Calendar each Monday, finds the gaps, and books 2-hour focus blocks before anything else can. It should be smart enough to avoid the day after a string of late meetings (when I'm always zonked) and let me set a preference like 'mornings first' or 'afternoons only'. Bonus: if a meeting gets cancelled, it should prompt me to reclaim that time as focus.