Integrate Firebase Cloud Messaging into iOS application (Swift). Would also need a view controller that facilitates sending of chat "bubbles."

I've tried to teach myself, but integrating a chat feature into my iOS application is just too confusing. This chat feature is the only part of the project that needs to be done before beta testing. I've already got a firebase user database and Apple Push Notifications service integrated with Firebase. I would essentially need somebody to: a. Create a view controller that facilitates the sending of chat messages, like any other chat app (different color bubbles associated with each respective user). b. Communicating these messages with my Firebase server. The attached video demonstrates the navigation via tab bar controller to the chat log view. This chat log view would show the user's active conversations. Upon clicking the compose bar button in the top right, the user would then be presented with a search feature to look up users in the Firebase system. Upon selecting a user, chat between the two users would be facilitated in a view controller that you would need to make. This flow from chat log to conversation would be very similar to the iOS text app's flow from the view that shows active conversations, the ability to compose and choose a recipient from the user's contacts, and then send a message in a "text" view controller.