Word Chain Challenge

You are given an array of strings. Your task is to write a function that finds the longest chain of words from the array such that for each consecutive pair of words, the last character of the first word is the same as the first character of the next word. Each word in the array can be used at most once in the chain.

For example, given the input:

["apple", "egg", "snack", "karat", "tuna"]

A possible chain is:

apple -> egg -> grape  // if "grape" were in the list, for instance

Since the array may contain words that do not necessarily form a complete chain, your function should return the chain (as an array of strings) that contains the maximum number of words. In case there are multiple chains with the same maximum length, you can return any one of them.

Please provide a complete solution in the programming language of your choice. Make sure your code is well-documented and consider edge cases such as empty input or no possible chain.