I need an expert advisor (trading robot) for Mac computers

I would like to order an expert advisor, which will automatically buy / sell, as soon as a certain combination of H1 candlesticks appear. Stop loss and take profit should be automatically set based on the size of these candlesticks and my individual information, how high the risk for this individual trade should be (in EUR). 

So the calculation for the automated trade should be done like this: What is the acceptable risk for this trade in EUR? What was the size of the latest four H1 candlesticks? At which FX pair is this trade going to be done? How many lots must be bought (in order to have the correct stop loss)?