// ==================================================================
// PLEASE DO NOT ATTEMPT TO SIMPLIFY THIS CODE.
// KEEP THE SPACE SHUTTLE FLYING.
// ==================================================================
//
// This controller is intentionally written in a very verbose style. You will
// notice:
//
// 1. Every 'if' statement has a matching 'else' (exception: simple error
// checks for a client API call)
// 2. Things that may seem obvious are commented explicitly
//
// We call this style 'space shuttle style'. Space shuttle style is meant to
// ensure that every branch and condition is considered and accounted for -
// the same way code is written at NASA for applications like the space
// shuttle.
