Convert simple pinescript study into an EA

I would like to convert this simple pinescript study into an expert advisor:

study("myStudy1",overlay=true, shorttitle="study1")

boxp=input(5, "BOX LENGTH")

LL = lowest(low,boxp)
k1=highest(high,boxp)
k2=highest(high,boxp-1)
k3=highest(high,boxp-2)

NH =  valuewhen(high>k1[1],high,0)
box1 =k3<k2
TopBox = valuewhen(barssince(high>k1[1])==boxp-2 and box1, NH, 0)
BottomBox = valuewhen(barssince(high>k1[1])==boxp-2 and box1, LL, 0)


plot(TopBox, linewidth=3, color=green, title="TBbox")
plot(BottomBox, linewidth=3, color=red, title="BBbox")

The study looks like this:

SELL SIGNAL:

When price crosses the red line, open sell at market price

Stop loss is the GREEN line

Take profit target is 4:1 reward ratio, so will depend on the size of the stop loss

BUY SIGNAL:

When the high crosses the green line, open a buy at market price

Stop loss is the RED line

Take profit target is 4:1 reward ratio, so will depend on the size of the stop loss

LOT SIZE:

calculation based on percentage of account, for example if the user chooses 1% risk, then calculation needed to work out the lot size.

EXIT CONDITIONS:

If short, exit the trade anytime that price touches the GREEN line (similar to a trailing stop)

If long, exit the trade anytime that price touches the RED line (similar to a trailing stop)

GENERAL RULES:

Expert should ignore all existing trades without the magic number

No hedging - so if an opposite signal happens during a trade, the expert needs to close the trade first, then open a new trade in the opposite direction

The maximum open trades (opened from the expert advisor) should be 1 per market. While a trade is already open, the expert will ignore new signals in the same direction.

Trades need to alternate - once a sell trade closes, only a buy signal can open next. Once a buy trade closes, only a sell signal can open next etc.