Smart Entry System

//version=5
indicator("Smart Entry System", overlay=true)

// ── Inputs ──
len = input.int(20, title="Structure Lookback")

// ── Market Structure Shift ──
mssBuy = low < ta.lowest(low, len) and high > ta.highest(high, len)
mssSell = high > ta.highest(high, len) and low < ta.lowest(low, len)

// ── Fair Value Gap ──
fvgUp = low[2] > high and low[1] > high
fvgDown = high[2] < low and high[1] < low

// ── Breaker Block ──
breakerBuy = close[2] > open[2] and close[1] < open[1] and close > open
breakerSell = close[2] < open[2] and close[1] > open[1] and close < open

// ── Inversion Point ──
inversionBuy = close > high[1] and close[1] < high[2]
inversionSell = close < low[1] and close[1] > low[2]

// ── Fibonacci Levels ──
var float fibHigh = na
var float fibLow = na

if mssBuy
fibLow := low
fibHigh := ta.highest(high, len)
else if mssSell
fibHigh := high
fibLow := ta.lowest(low, len)

// Avoid plotting if values are not ready
validFib = not na(fibHigh) and not na(fibLow)

fib38 = validFib ? fibHigh - (fibHigh - fibLow) * 0.382 : na
fib61 = validFib ? fibHigh - (fibHigh - fibLow) * 0.618 : na

plot(fib38, title="Fib 38.2%", color=color.gray, linewidth=1)
plot(fib61, title="Fib 61.8%", color=color.gray, linewidth=1)

// ── Entry Conditions ──
buyEntry = mssBuy and fvgUp and breakerBuy and inversionBuy and close < fib61
sellEntry = mssSell and fvgDown and breakerSell and inversionSell and close > fib38

// ── Entry Plot ──
plotshape(buyEntry, title="Buy Entry", location=location.belowbar, color=color.green, style=shape.labelup, text="BUY")
plotshape(sellEntry, title="Sell Entry", location=location.abovebar, color=color.red, style=shape.labeldown, text="SELL")