How do I make enemy shoot at player(Sine wave)

I have an enemy(fly) that is using the sine behavior. Every 2 seconds i want it to shoot at player(if player is visible).Moreover i want to restrict the enemy moves between 2 barriers.

This is what i tried thus far

dropbox.com/s/0cicumlzet5v7xh/platformgame.capx

This will fix your fly problem by only allowing it to shoot when it is on-screen, and when a fireball is spawned it will set it's angle to the player.