Custom Reversal

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © claygrace74

//@version=6
indicator("Custom Reversal", shorttitle="Rev", overlay=true)

// ==================== Settings ====================
var rev_group = "Reversal Detection"
pivotLeft   = input.int(5, "Pivot Left Bars", minval=2, group=rev_group)
pivotRight  = input.int(2, "Pivot Right Bars", minval=1, group=rev_group)
rsiLen      = input.int(14, "RSI Length", minval=1, group=rev_group)
rsiOB       = input.int(70, "RSI Overbought", minval=50, maxval=100, group=rev_group)
rsiOS       = input.int(30, "RSI Oversold", minval=0, maxval=50, group=rev_group)
volMulti    = input.float(1.3, "Volume Confirmation Multiplier", minval=1.0, step=0.1, group=rev_group)

var disp_group = "Display Settings"
i_showSignals  = input.bool(true, "Show Reversal Signals", group=disp_group)
i_showPivots   = input.bool(true, "Show Pivot Points", group=disp_group)
i_useVolConf   = input.bool(true, "Require Volume Confirmation", group=disp_group)
i_useRSIConf   = input.bool(true, "Require RSI Confirmation", group=disp_group)

// ==================================================================================
// Core Calculations
// ==================================================================================
rsi = ta.rsi(close, rsiLen)
avgVol = ta.sma(volume, 20)
highVol = volume > avgVol * volMulti

// Pivot detection
pivHigh = ta.pivothigh(high, pivotLeft, pivotRight)
pivLow  = ta.pivotlow(low, pivotLeft, pivotRight)

// Engulfing patterns (strongest single-signal reversals)
bullEngulf = close > open and close > open[1] and open < close[1] and close[1] < open[1] and (close - open) > math.abs(close[1] - open[1])
bearEngulf = close < open and close < open[1] and open > close[1] and close[1] > open[1] and math.abs(close - open) > (close[1] - open[1])

// Pin bar / hammer / shooting star
bodySize = math.abs(close - open)
upperWick = high - math.max(close, open)
lowerWick = math.min(close, open) - low
totalRange = high - low

bullPin = totalRange > 0 and lowerWick > bodySize * 2 and upperWick < bodySize * 0.5 and totalRange > ta.atr(14) * 0.5
bearPin = totalRange > 0 and upperWick > bodySize * 2 and lowerWick < bodySize * 0.5 and totalRange > ta.atr(14) * 0.5

// Swing failure pattern (price makes new high/low but immediately reverses)
newHigh = high > ta.highest(high, 10)[1]
newLow  = low < ta.lowest(low, 10)[1]
swingFailBull = newLow and close > open and close > (high + low) / 2
swingFailBear = newHigh and close < open and close < (high + low) / 2

// Composite reversal signals with optional filters
volOk  = not i_useVolConf or highVol
rsiOkBull = not i_useRSIConf or rsi < rsiOS or rsi[1] < rsiOS
rsiOkBear = not i_useRSIConf or rsi > rsiOB or rsi[1] > rsiOB

bullRev = volOk and rsiOkBull and (bullEngulf or bullPin or swingFailBull)
bearRev = volOk and rsiOkBear and (bearEngulf or bearPin or swingFailBear)

// Pattern name for labels
f_bullName() =>
    bullEngulf ? "Engulf" : bullPin ? "Pin Bar" : swingFailBull ? "Swing Fail" : ""

f_bearName() =>
    bearEngulf ? "Engulf" : bearPin ? "Pin Bar" : swingFailBear ? "Swing Fail" : ""

// ==================================================================================
// Plots
// ==================================================================================

// Pivot point markers
plotshape(i_showPivots and not na(pivHigh), style=shape.circle, location=location.abovebar, color=color.new(color.red, 40), size=size.tiny, offset=-pivotRight, title="Pivot High")
plotshape(i_showPivots and not na(pivLow),  style=shape.circle, location=location.belowbar, color=color.new(color.green, 40), size=size.tiny, offset=-pivotRight, title="Pivot Low")

// Reversal signals
plotshape(i_showSignals and bullRev, style=shape.triangleup,   location=location.belowbar, color=color.green, size=size.small, title="Bull Reversal")
plotshape(i_showSignals and bearRev, style=shape.triangledown, location=location.abovebar, color=color.red,   size=size.small, title="Bear Reversal")

// Pattern name labels
if i_showSignals and bullRev
    label.new(bar_index, low, f_bullName(), style=label.style_none, textcolor=color.green, size=size.small)
if i_showSignals and bearRev
    label.new(bar_index, high, f_bearName(), style=label.style_none, textcolor=color.red, size=size.small)

// Signal background
bgcolor(bullRev ? color.new(color.green, 92) : bearRev ? color.new(color.red, 92) : na, title="Reversal BG")

// ==================================================================================
// Alert Conditions
// ==================================================================================
alertcondition(bullRev,     "Bullish Reversal",        "Bullish reversal pattern detected with confirmations")
alertcondition(bearRev,     "Bearish Reversal",        "Bearish reversal pattern detected with confirmations")
alertcondition(bullEngulf,  "Bullish Engulfing",       "Bullish engulfing candle detected")
alertcondition(bearEngulf,  "Bearish Engulfing",       "Bearish engulfing candle detected")
alertcondition(swingFailBull, "Bullish Swing Failure", "New low followed by bullish close — swing failure")
alertcondition(swingFailBear, "Bearish Swing Failure", "New high followed by bearish close — swing failure")