I need a EA made from a MQL5 indicator

This EA is very simple. The indicator is an oscillator, so, I need to sell when the line cross down below de 80 level, not above or equal to the level, but cross below that level, and buy when the line cross above the 20 level, not below or equal to the 20 level, but above it, always when the candle is closed. I could use different values for the levels (80-20, 85-15, 90-10, 95-5, etc), and different inputs for the line. This EA must have TP in pips, SL and Trailing Stop in pips, Size Lot, break even. Also, it must be able to close a sell when a buy signal appears and viceversa, and must be able to open an opposite operation, I mean, if a sell signal appears the EA must buy and viceversa. Also, several operations of the same kind can be opened at the same time, I mean, several sells or several buys can be active at the same time and be closed when a single opposite signal appears.