I want to program a digital buying and selling expert.

An example of buying and another of selling

Buy at the current price. If the price drops by a certain amount, denoted as 'x', buy from below. If it continues to drop, buy from after 'x2'. If it continues to drop, buy from 'x3'.

Example: We bought at point zero. The price dropped by 100 points, so we buy. It dropped by 200 points to -300, so we buy. It dropped by 300 points to -600, so we buy.

0 - 100 - 300 - 600 - 1000 - 1500  - 2100

If the price doesn't drop and rises, we determine a distance of 'x' and buy at the top: 0, 100, 200, 300, 400

In the settings, we specify the number of contracts, contract value, contract target, and trailing stop.