Risk model scripts

I am looking for the following with trading equities. 1. A script that sells all positions when unrealized PNL hits -$150 including commissions and locks the trading system for the day. 2. If unrealized PNL hits +$150 a trailing stop is created on my unrealized PNL that would sell all positions if $0.00 (breakeven) is reached and lock the trading system for the day. 3. If unrealized PNL hits +$300 it trails the unrealized PNL with a max loss of $150. This trailing unrealized PNL will trail every increment Above +$300 with the same $150 loss. So for example trade goes to +$450 the system would stop and sell all positions if unrealized PNL drops back down to +$300. Let me know if you have any other questions and if this is something than can be scripted.