Expert Advisor needed based on stop reverse/hedging strategy

This EA would be basically a Trades manager. It should allow an initial position to be opened manually ( We call this Trade A). Thereafter the EA should immediately open a pending order in the opposite direction, 3 times the size of the initial order with a similar TP target in pips ( We call this trade B).Trade B should be placed in exact distance of TP of trade A but in opposite direction from Trade A opening position. For instance if Trade A is a 0.1 Lot long with 15 pips TP target. The EA should right away open Trade B, a pending 0.3 Lot short order with 15 pips TP target, 15 pips away from Trade A opening. The EA must be able to close Trade B immediately if Trade A hit TP before Trade B is triggered.The EA must also be able to close Trade B at break even where Trade B had been initially triggered but TP not reached and price has reversed. At this point where the EA closes Trade B at break even it should also re-place the pending order of Trade B as at the beginning. This is just in case price reverses back again. The EA should be able to repeat this process endlessly.

To summarise:

i) open a '3x size' pending opposing order to Trade A immediately after Trade A is placed.

ii) Close Trade B immediately when Trade A reaches TP

iii) Close Trade B at break even, where it had been triggered but price has turned.

iv) Repeat step i) immediately if step iii) above has been executed

The EA must be able to repeat these steps in perpetuity.