How to make an income system using mana?

[terranempire]

I am trying to make an income system based on mana (in which 1 mana = 1 gold).
The problem is, I don't know how to do it.
Oh, and I use GUI mostly, so advanced JASS (that is, not any garbage collection system) won't help at all (probably).

 

[Pharaoh_]

• Trigger
• Events
  • Time - Every 1.00 seconds of game-time
• Conditions
• Actions
  • Player Group - Pick every player in (All players) and do (Actions)
    • Loop - Actions
      • Custom script: set bj_wantDestroyGroup = true
      • Unit Group - Pick every unit in (Units owned by (Picked player) of type Mana Tower) and do (Actions)
        • Loop - Actions
          • Player - Add (Integer(Mana of (Picked unit))) to (Picked player) Current Gold

 

[terranempire]

• Trigger
• Events
  • Time - Every 1.00 seconds of game-time
• Conditions
• Actions
  • Player Group - Pick every player in (All players) and do (Actions)
    • Loop - Actions
      • Custom script: set bj_wantDestroyGroup = true
      • Unit Group - Pick every unit in (Units owned by (Picked player) of type Mana Tower) and do (Actions)
        • Loop - Actions
          • Player - Add (Integer(Mana of (Picked unit))) to (Picked player) Current Gold

So it's that simple?
Man, I gotta remember the convert to integer action.
Anyways, thanks for the help!
It is greatly appreciated.

 

[Maker]

It might be a good idea to track the mana regeneration instead of adding current mana. Can the units lose mana?