study("Higher High Lower Low Strategy", overlay =true, max_lines_count = 500)
lb = input(5, title="Left Bars", minval = 1)
rb = input(5, title="Right Bars", minval = 1)
showsupres = input(true, title="Support/Resistance", inline = "srcol")
supcol = input(color.lime, title ="", inline = "srcol")
rescol = input(color.red, title ="", inline = "srcol")
srlinestyle = input(line.style_dotted, title = "Line Style/Width", options = [line.style_solid, line.style_dashed, line.style_dotted], inline ="style")
srlinewidth = input(3, title = "", minval = 1, maxval = 5, inline ="style")
changebarcol = input(true, title="Change Bar Color", inline = "bcol")
bcolup = input(color.blue, title ="", inline = "bcol")
bcoldn = input(color.black, title ="", inline = "bcol")

ph = pivothigh(lb, rb)
pl = pivotlow(lb, rb)

hl = iff(ph, 1, iff(pl, -1, na)) // Trend direction
zz = iff(ph, ph, iff(pl, pl, na)) // similar to zigzag but may have multiple highs/lows
zz :=iff(pl and hl == -1 and valuewhen(hl, hl, 1) == -1 and pl > valuewhen(zz, zz, 1), na, zz)
zz :=iff(ph and hl == 1  and valuewhen(hl, hl, 1) == 1  and ph < valuewhen(zz, zz, 1), na, zz)

hl := iff(hl==-1 and valuewhen(hl, hl, 1)==1 and zz > valuewhen(zz, zz, 1), na, hl)
hl := iff(hl==1 and valuewhen(hl, hl, 1)==-1 and zz < valuewhen(zz, zz, 1), na, hl)
zz := iff(na(hl), na, zz)

findprevious()=>  // finds previous three points (b, c, d, e)
    ehl = iff(hl==1, -1, 1)
    loc1 = 0.0, loc2 = 0.0, loc3 = 0.0, loc4 = 0.0
    xx = 0
    for x=1 to 1000
        if hl[x]==ehl and not na(zz[x])
            loc1 := zz[x]
            xx := x + 1
            break
    ehl := hl
    for x=xx to 1000
        if hl[x]==ehl and not na(zz[x])
            loc2 := zz[x]
            xx := x + 1
            break
    ehl := iff(hl==1, -1, 1)
    for x=xx to 1000
        if hl[x]==ehl and not na(zz[x])
            loc3 := zz[x]
            xx := x + 1
            break
    ehl := hl
    for x=xx to 1000
        if hl[x]==ehl and not na(zz[x])
            loc4 := zz[x]
            break
    [loc1, loc2, loc3, loc4]

float a = na, float b = na, float c = na, float d = na, float e = na
if not na(hl)
    [loc1, loc2, loc3, loc4] = findprevious()
    a := zz 
    b := loc1
    c := loc2
    d := loc3
    e := loc4

_hh = zz and (a > b and a > c and c > b and c > d)
_ll = zz and (a < b and a < c and c < b and c < d)
_hl = zz and ((a >= c and (b > c and b > d and d > c and d > e)) or (a < b and a > c and b < d))
_lh = zz and ((a <= c and (b < c and b < d and d < c and d < e)) or (a > b and a < c and b > d))

plotshape(_hl, text="HL", title="Higher Low", style=shape.labelup, color=color.lime, textcolor=color.black, location=location.belowbar, offset = -rb)
plotshape(_hh, text="HH", title="Higher High", style=shape.labeldown, color=color.lime, textcolor=color.black, location=location.abovebar, offset = -rb)
plotshape(_ll, text="LL", title="Lower Low", style=shape.labelup, color=color.red, textcolor=color.white, location=location.belowbar, offset = -rb)
plotshape(_lh, text="LH", title="Lower High", style=shape.labeldown, color=color.red, textcolor=color.white, location=location.abovebar, offset = -rb)

float res = na, float sup = na
res := iff(_lh, zz, res[1])
sup := iff(_hl, zz, sup[1])

int trend = na
trend := iff(close > res, 1, iff(close < sup, -1, nz(trend[1])))

res := iff((trend == 1 and _hh) or (trend == -1 and _lh), zz, res)
sup := iff((trend == 1 and _hl) or (trend == -1 and _ll), zz, sup)
rechange = res != res[1]
suchange = sup != sup[1]

var line resline = na
var line supline = na
if showsupres
    if rechange
        line.set_x2(resline, bar_index)
        line.set_extend(resline, extend = extend.none)
        resline := line.new(x1 = bar_index - rb, y1 = res, x2 = bar_index, y2 = res, color = rescol, extend = extend.right, style = srlinestyle, width = srlinewidth)
     
    if suchange
        line.set_x2(supline, bar_index)
        line.set_extend(supline, extend = extend.none)
        supline := line.new(x1 = bar_index - rb, y1 = sup, x2 = bar_index, y2 = sup, color = supcol, extend = extend.right, style = srlinestyle, width = srlinewidth)    

barcolor(color = iff(changebarcol, iff(trend == 1, bcolup, bcoldn), na))