I was just asked to explore Ionic Framework any advise?
Please tell me I will not face hell doing an ionic app :(

I started reading docs and the word Cordova appears to be used a lot, I had a really bad experience with Cordova + PhoneGap, am I in trouble? am I going to regret life?

TL;DR;

I was asked to give estimation on an app, that:
1. No one has a clue what it does, even though there is v1 on the store with almost 10% of functionality working
2. No one has a clue what should be in the new rewritten version
3. We are already behind schedule and I have no clue why, I've just been told that
4. They need UI flow that shows how the app will work with static data and when API's are ready (because ya know, writing code is easier than creating wireframes and modifying them accordingly) I will then need to link app with API as if it is as simple as drinking a cup of water, especially that: 1. What is water? 2. Do I have a cup or is it given, and 3. Relax bro, drinking water is like eating a burger, piece of cake!

I'm not sure what to do, not enough that it's React Native but also spaghetti requirements that no one was able to answer my simple question: What is the app responsible of?

P.S.: Some say I must rewrite the old app ONLY, no new features, others say: Turn the new web portal into mobile app, I say: WTF is going one?