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//@version=5
indicator(title="Range Filter", shorttitle="Range Filter", overlay=true)

//////////////////////////////////////////////////////////////////////////

// Color variables
upColor   = color.white
midColor  = #90bff9
downColor = color.blue

// Source
src = input(defval=close, title="Source")

// Sampling Period
// Settings for 5min chart, BTCUSDC. For Other coin, change the paremeters
per = input.int(defval=100, minval=1, title="Sampling Period")

// Range Multiplier
mult = input.float(defval=3.0, minval=0.1, title="Range Multiplier")

// Smooth Average Range
smoothrng(x, t, m) =>
    wper = t * 2 - 1
    avrng = ta.ema(math.abs(x - x[1]), t)
    smoothrng = ta.ema(avrng, wper) * m
    smoothrng
smrng = smoothrng(src, per, mult)

// Range Filter
rngfilt(x, r) =>
    rngfilt = x
    rngfilt := x > nz(rngfilt[1]) ? x - r < nz(rngfilt[1]) ? nz(rngfilt[1]) : x - r :
       x + r > nz(rngfilt[1]) ? nz(rngfilt[1]) : x + r
    rngfilt
filt = rngfilt(src, smrng)

// Filter Direction
upward = 0.0
upward := filt > filt[1] ? nz(upward[1]) + 1 : filt < filt[1] ? 0 : nz(upward[1])
downward = 0.0
downward := filt < filt[1] ? nz(downward[1]) + 1 : filt > filt[1] ? 0 : nz(downward[1])

// Target Bands
hband = filt + smrng
lband = filt - smrng

// Colors
filtcolor = upward > 0 ? upColor : downward > 0 ? downColor : midColor
barcolor = src > filt and src > src[1] and upward > 0 ? upColor :
   src > filt and src < src[1] and upward > 0 ? upColor :
   src < filt and src < src[1] and downward > 0 ? downColor :
   src < filt and src > src[1] and downward > 0 ? downColor : midColor

filtplot = plot(filt, color=filtcolor, linewidth=2, title="Range Filter")

// Target
hbandplot = plot(hband, color=color.new(upColor, 70), title="High Target")
lbandplot = plot(lband, color=color.new(downColor, 70), title="Low Target")

// Fills
fill(hbandplot, filtplot, color=color.new(upColor, 90), title="High Target Range")
fill(lbandplot, filtplot, color=color.new(downColor, 90), title="Low Target Range")

// Bar Color
barcolor(barcolor)

// Break Outs
longCond = bool(na)
shortCond = bool(na)
longCond := src > filt and src > src[1] and upward > 0 or
   src > filt and src < src[1] and upward > 0
shortCond := src < filt and src < src[1] and downward > 0 or
   src < filt and src > src[1] and downward > 0

CondIni = 0
CondIni := longCond ? 1 : shortCond ? -1 : CondIni[1]
longCondition = longCond and CondIni[1] == -1
shortCondition = shortCond and CondIni[1] == 1

//Alerts
plotshape(longCondition, title="Buy Signal", text="Buy", textcolor=color.white, style=shape.labelup, size=size.small, location=location.belowbar, color=color.new(#aaaaaa, 20))
plotshape(shortCondition, title="Sell Signal", text="Sell", textcolor=color.white, style=shape.labeldown, size=size.small, location=location.abovebar, color=color.new(downColor, 20))


alertcondition(longCondition, title="Buy alert on Range Filter", message="Buy alert on Range Filter")
alertcondition(shortCondition, title="Sell alert on Range Filter", message="Sell alert on Range Filter")
alertcondition(longCondition or shortCondition, title="Buy and Sell alert on Range Filter", message="Buy and Sell alert on Range Filter")


// For use as a Strategy
// ___________________________________________________________________________________________________________

// 1. Replace the word "indicator" on line 2 with the word "strategy"
// 2. Uncomment the code below by highlighting it and pressing Ctl + '/'

// Settings for 5min BTCUSDT. For other timeframes and assets, adjust the parameters within the settings menu.
// ___________________________________________________________________________________________________________

// grp_STRAT   = "Strategy settings"
// timeInput   = input.time(timestamp("1 Nov 2022 00:00 +0000"), title="Start date", group=grp_STRAT)
// tpInPips    = input.int(400, title="TP (in pips)", group=grp_STRAT)
// slInPips    = input.int(100, title="SL (in pips)", group=grp_STRAT)

// timePeriod  = time >= timeInput
// notInTrade  = strategy.position_size <= 0

// if(longCondition and timePeriod and notInTrade)
//     strategy.entry("Long", strategy.long)
//     strategy.exit("Exit long", "Long", loss=slInPips, profit=tpInPips)
// if(shortCondition and timePeriod and notInTrade)
//     strategy.entry("Short", strategy.short)
//     strategy.exit("Exit short", "Short", loss=slInPips, profit=tpInPips)