标题：求助老师帮我做一个交易系统

请老师帮我写个原码，诉求是：当BBI线上穿20均线平掉空单剩余仓位同时开多4手，负50个点止损，正60个点止盈2手；当BBI线下穿20线平仓剩余多单仓位同时开空4手，还是负50个点止损，正60个点止盈2手，如此反复。谢谢！

备注：BBI线上穿和下穿20线的确定以每根K线的收线为准

 INPUT:M1(3,1,100,10),M2(6,1,100,10),M3(12,1,100,10),M4(24,1,100,10);
MA20:MA(C,20);
BBI:(MA(CLOSE,M1)+MA(CLOSE,M2)+MA(CLOSE,M3)+MA(CLOSE,M4))/4;

JC:CROSS(BBI,MA20);
SC:CROSS(MA20,BBI);

if jc then
begin
sellshort(holding<0,holding,market);
buy(holding=0,4,market);    
end

if sc then
begin
sell(holding>0,holding,market);
buyshort(holding=0,4,market);    
end

if holding<0 and  ((c-ENTERPRICE>=50*MINDIFF) or (ENTERPRICE-c>=60*MINDIFF)) then 止盈止损1:sellshort(1,2,market);
if holding>0 and  ((ENTERPRICE-c>=50*MINDIFF) or (c-ENTERPRICE>=60*MINDIFF)) then 止盈止损2:sell(1,2,market);