S

• casting time expending its spell slot as well as Contingency's spell slot. The spell doesn't take effect until a chosen trigger occurs.
  
  As soon as the trigger happens
• range the spell takes effect whether you want it to or not

• components and then Contingency ends.
  
  You can only target yourself with the contingent spell
• duration you can only have one contingent spell at a time

and the whole spell ends if you ever don't have the material component on your person.

See the Player's Handbook for the exact rules.

Spells casting spells seems like a bad idea. Let's try it.
-Abjurist Ovtuch Irieya moments before major arcane breakthrough;PHB 256