CoC Calculation

So im just slightly confused to how reliably calculate DPS with CoC builds.

I think the displayed tooltip DPS for the spells is the average damage including critical chance, critical damage, and cast speed. Thus to get the average per cast on each spell you need to take the tooltip DPS and divide it by the cast speed and that is the average per hit. However, does this take into account critical? im unsure about this.

After finding the average per cast per spell its pretty easy to calculate the rest, except the cooldown time of CoC. When does the cooldown apply?

For instance, if i crit with an aoe skill and i hit 10 mobs, does the cooldown apply when procing (for ease sake) 10 times off one cast? or is it just the spam between procs from the initial hit. AKA it limits your attack speed? its hard to explain, but im just not clear as to when and how to calculate the cooldown as a factor when calculating CoC DPS.
In fact im unclear when the cooldown even is a factor, even when playing my build.