How do I create a patrolling guard?

Hi,

I want to create AI for patrolling enemies.

I need the enemies to move left and right. If they spot the player within 500, I want them to stop moving left and right, start moving towards the player and start shooting. If the player moves away (>550). I need them to go back to the same place and continue the patrol.

So far, I've tried two ways but both are buggy and don't work.

1. I put Pathfind and Line of Sight and 8-Direction behaviour. Used a variable for the two different behaviours of AI(patrolling, attacking)

2. Used the bullet behaviour.

I've attached a screenshot for both ways.

I'll have a lot of guards in my game so I would like, if its possible to do it without changing every time the coords for every guard.

Thanks

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