EA based on 100 bars highs and lows. MQ4

Available position (AP) = 100

Buy Trigger:

If (price > 100 bars highest high) and (if no trade yet this bar)

then (buy 10% of AP) and (reduce AP by 10%) 

Buy exit:

Mid100 = (100 bars highest high + 100 bars lowest low)/2

If (price < Mid100) and (if no trade yet this bar)

then (sell 20% of open position) and (increase AP by the number of units)

If price < lowest low then exit all trades 

Sell Trigger:

If (price < 100 bars lowest low) and (if no trade yet this bar)

then (sell 10% of AP) and (reduce AP by 10%) 

Sell exit:

Mid100 = (100 bars highest high + 100 bars lowest low)/2

If (price > Mid100) and (if no trade yet this bar)

then (buy 20% of open position) and (increase AP by the number of units)

If price > highest high then exit all short trades 

Example:
Already bought 20 units, so AP is now 100 - 20 = 80. When buy triggered again, order is 0.2 x 80 = 16 units. Open position is now 20 + 16 = 36.
After some time, price falls below Mid100, so sell 20% of 36, 0.2 x 36 = 7.2 units (round to the nearest whole number, ie 7 units). Open position now 36 - 7 = 29.
Then next candle the price falls below Mid100 again, so sell 0.2 x 29 = 5.8 units (round up to 6). Open position now 29 - 6 = 23.
Then next candle price > 100 bars highest high. AP = 100 - 23 = 77 units. Buy order is 0.2 x 77 = 15.4 (15) units. Open position is now 23 + 15 = 38. AP is now 100 - 38 = 62.

Include normal error correction.

For testing, number of bars, AP number and the percentage should be variables. Mid100 should be able to be changed to highest high for short trades or lowest low for long trades.