//@version=3
strategy(title="RK Trend Hunter", overlay=true)

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

// Sampling Period
per = input(defval=50, minval=1, title="Sampling Period")

// Trend Multiplier (formerly Range Multiplier)
mult = input(defval=10.0, minval=0.1, title="Trend Multiplier")

// Smooth Trend Calculation (formerly Smooth Average Range)
smoothTrend(x, t, m)=>
    wper      = (t * 2) - 1
    avrng     = ema(abs(x - x[1]), t)
    smoothTrend = ema(avrng, wper) * m
    smoothTrend
smTrend = smoothTrend(src, per, mult)

// Trend Filter Calculation 
trendFilter(x, r)=>
    trendFilter  = x
    trendFilter := x > nz(trendFilter[1]) ? ((x - r) < nz(trendFilter[1]) ? nz(trendFilter[1]) : (x - r)) : ((x + r) > nz(trendFilter[1]) ? nz(trendFilter[1]) : (x + r))
    trendFilter
filt = trendFilter(src, smTrend)

// 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])

// Colors
trendColor = upward > 0 ? lime : downward > 0 ? red : orange

// === Neon Glow Effect ===
plot(filt, color=trendColor, linewidth=9, transp=90, title="Glow Outer")
plot(filt, color=trendColor, linewidth=7, transp=80, title="Glow Mid")
plot(filt, color=trendColor, linewidth=5, transp=70, title="Glow Inner")
plot(filt, color=trendColor, linewidth=3, title="Trend Filter") // Main line

// === Original Buy/Sell Signal Conditions ===
// Buy condition: Price crosses above the 'filt' line from below and the line is lime (upward trend)
buySignal = crossover(src, filt) and trendColor == lime
plotshape(buySignal, style=shape.labelup, location=location.belowbar, color=green, text="BUY", textcolor=white, size=size.small)

// Sell condition: Price crosses below the 'filt' line from above and the line is red (downward trend)
sellSignal = crossunder(src, filt) and trendColor == red
plotshape(sellSignal, style=shape.labeldown, location=location.abovebar, color=red, text="SELL", textcolor=white, size=size.small)

// === Additional Buy/Sell Conditions Based on Trend Color Change ===
// New Buy condition: Trend changes from downward (red) to upward (green)
newBuySignal = trendColor == lime and trendColor[1] == red
plotshape(newBuySignal, style=shape.labelup, location=location.belowbar, color=lime, text="STRONG", textcolor=white, size=size.small)

// New Sell condition: Trend changes from upward (green) to downward (red)
newSellSignal = trendColor == red and trendColor[1] == lime
plotshape(newSellSignal, style=shape.labeldown, location=location.abovebar, color=maroon, text="STRONG", textcolor=white, size=size.small)

// === Alert Conditions ===
alertcondition(buySignal, title="Buy Signal", message="Buy signal triggered")
alertcondition(sellSignal, title="Sell Signal", message="Sell signal triggered")
alertcondition(newBuySignal, title="Strong Buy Signal", message="Strong Buy signal triggered")
alertcondition(newSellSignal, title="Strong Sell Signal", message="Strong Sell signal triggered")