Need a simple EA for MT4

Hello everybody

I need an expert advisor that is based on a 20 period exponential moving average to trigger buy and sell positions on the Spot Gold XAUUSD. As a start, if a bullish candle closes above the 20 period moving average the system place an order directly at the market price and wait for the market to move; if the market moved in the direction of this position and reached the USD3 profit per ounce then the system close the order immediately at the market price. Otherwise, if the target is not reached and bearish candle closes bellow the moving average then the system place a sell order with double the lot size of the first order. Also, if reversed back up again and a bullish candle closed above the moving average; then the system add another buy order with double the lot size of the sell position opened recently and so on (keep doubling lot size with each signal candle) until the target of USD3 profit per ounce is reached for the most recent opened position.

NEEDED ASAP!!!

Thanks