Enemy AI With changing Player

Hello everyone, Im new to unity and newish to scripting but i am picking it up pretty fast. So my problem is this: I would like to write a script that does three things for an enemy ai.

1. Randomly move around

2. if it collides with a different type of enemy it changes into that enemy

3. if i shoot it it changes back to its original state

At first i made in an array of waypoints but after looking at it i decided i needed them to move randomly. i wrote a shoot script so im good on that part. i would also like it to be in javascript(unityscript) since im not very knowledgable with c# or boo

any help or direction would be greatly appreciated

thank you in advance.