i'm making a top down rpg can some one help me with enemy ai please thanks?

I'd be glad to help. What do you want out of your enemies?

Also, how do the battles work?

I wrote some code for AI that chases you... :]

Like this?

i want the enemies to chase me ,but have boundarys equal to the room. when the enemy strikes with a sword my health goes down(right now i just want both the player and the enemy moving at the same time I can deal with the rest) and later i want (for a boss) i want him to shoot a projectile at me when we are far away from each other. I also want the enemy to back away when the player attacks.

Do you want diagonal movement?

Yes