Accurate Support Resistance Breakout System - Amibroker AFL Code

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_SECTION_BEGIN("Price");
SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));
Plot( C, "Close", ParamColor("Color", colorBlack ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() ); 
_SECTION_END();

_SECTION_BEGIN("CH");
Ch = Param("ch", 5,1,15,1);
bi = Cum(1)-1;
cbar = Param("cbar",2,2,50,1);
function GetTop(bars) 
{
Top = H == HHV(H,2*bars) AND Ref(HHV(H,bars),bars) < H;
Top = Top AND LastValue(bi)-ValueWhen(Top,bi) > bars;
return Top;
}
function GetValley(bars)
{
Valley = L == LLV(L,2*bars) AND Ref(LLV(L,bars),bars) > L;
Valley = Valley AND LastValue(bi)-ValueWhen(Valley,bi) > bars;
return Valley;
}

P1 = GetTop(Ch);
V1 = GetValley(Ch);
P1 = IIf(P1,IIf(ValueWhen(P1,bi,2) < ValueWhen(V1,bi),P1,IIf(ValueWhen(P1,H,2) > H,False,P1)),P1);
P1 = IIf(P1 AND ValueWhen(P1,bi,0) > bi,IIf(ValueWhen(P1,bi,0) < ValueWhen(V1,bi,0),IIf(ValueWhen(P1,H,0) >= H,False,P1),P1),P1);
V1 = IIf(V1,IIf(ValueWhen(V1,bi,2) < ValueWhen(P1,bi),V1,IIf(ValueWhen(V1,L,2)<L,False, V1)),V1);
V1 = IIf(V1 AND ValueWhen(V1,bi,0) > bi ,IIf(ValueWhen(V1,bi,0) < ValueWhen(P1,bi,0),IIf(ValueWhen(V1,L,0) <= L, False,V1),V1),V1); 
RF=ValueWhen(P1,H);
SF=ValueWhen(V1,L);
RF1 = IIf(RF AND BarsSince(P1) <=cbar,RF,Null);
SF1 = IIf(SF AND BarsSince(V1) <=cbar,SF,Null);
Plot(RF1,"",colorWhite,styleDots | styleNoLine);
Plot(SF1,"",colorWhite,styleDots | styleNoLine); 
Plot(RF,"",colorLightOrange,40+16);
Plot(SF,"",colorLightOrange,40+16);
PlotShapes(IIf(P1, shapeSmallSquare,shapeNone),colorYellow,0,H,10);
PlotShapes(shapeSmallCircle*P1,colorBlack,0,H,10);
PlotShapes(IIf(V1, shapeSmallSquare,shapeNone),colorYellow,0,L,-10);
PlotShapes(shapeSmallCircle*V1,colorBlack,0,L,-10);
_SECTION_END();