//@version=5
strategy("SMC Engine - 5 Rule Strategy", overlay=true, initial_capital=10000, default_qty_type=strategy.percent_of_equity, default_qty_value=10)

// ==========================================
// INPUTS & CONFIGURATION
// ==========================================
var string G_SESS = "Session Settings (New York Time)"
asiaSession   = input.session("2000-0200", title="Asia Session", group=G_SESS)
londonSession = input.session("0200-0500", title="London Execution Window", group=G_SESS)
nySession     = input.session("0700-1000", title="New York Execution Window", group=G_SESS)
timezoneInput = input.string("America/New_York", title="Session Timezone", group=G_SESS)

var string G_SMC = "SMC Parameters"
rrRatio       = input.float(6.23, title="Risk-to-Reward Ratio (Average is 6.23)", minval=0.1, group=G_SMC)
fvgThreshold  = input.float(0.0, title="Minimum FVG Size in Points", group=G_SMC, tooltip="Filters out microscopic FVGs")
useChoch      = input.bool(true, title="Require 1m/LTF Reversal Shift (CHoCH)", group=G_SMC)

// ==========================================
// SESSION TRACKING
// ==========================================
inAsia   = not na(time(timeframe.period, asiaSession, timezoneInput))
inLondon = not na(time(timeframe.period, londonSession, timezoneInput))
inNY     = not na(time(timeframe.period, nySession, timezoneInput))
inTradeWindow = inLondon or inNY

var float asiaHigh = na
var float asiaLow  = na
var bool asiaRangeSet = false

// Detect new Asia Session and reset high/low tracking
newAsia = inAsia and not inAsia[1]
if newAsia
    asiaHigh := high
    asiaLow := low
    asiaRangeSet := true
else if inAsia
    asiaHigh := math.max(high, nz(asiaHigh, high))
    asiaLow := math.min(low, nz(asiaLow, low))

// Visualizing Asia Range
plot(asiaRangeSet and not inAsia ? asiaHigh : na, title="Asia Session High", color=color.new(color.red, 30), style=plot.style_linebreak, linewidth=2)
plot(asiaRangeSet and not inAsia ? asiaLow : na, title="Asia Session Low", color=color.new(color.blue, 30), style=plot.style_linebreak, linewidth=2)

// ==========================================
// LIQUIDATION / SWEEP DETECTION
// ==========================================
var bool highSwept = false
var bool lowSwept = false

// Reset sweep status daily when Asia starts
if newAsia
    highSwept := false
    lowSwept := false

// Detect sweeps during execution windows
if inTradeWindow and asiaRangeSet
    if high > asiaHigh
        highSwept := true
    if low < asiaLow
        lowSwept := true

// ==========================================
// REVERSAL CONFIRMATION & FVGS (ENTRY TRIGGERS)
// ==========================================
// Bearish CHoCH: Close below previous swing/local low after high sweep
bearishCHoCH = highSwept and ta.falling(close, 1) and close < ta.valuewhen(highSwept and not highSwept[1], low, 0)
// Bullish CHoCH: Close above previous swing/local high after low sweep
bullishCHoCH = lowSwept and ta.rising(close, 1) and close > ta.valuewhen(lowSwept and not lowSwept[1], high, 0)

// Fair Value Gap Detection
// Bearish FVG: Low of candle 3 is greater than High of candle 1
bearishFVG = (low[2] > high) and (low[2] - high > fvgThreshold)
// Bullish FVG: High of candle 3 is less than Low of candle 1
bullishFVG = (high[2] < low) and (low - high[2] > fvgThreshold)

// ==========================================
// STRATEGY EXECUTION
// ==========================================
var float entryPrice = na
var float stopLossPrice = na
var float takeProfitPrice = na

// Trade state trackers to avoid multiple entries within the same session window
var int lastTradeBar = 0

if inTradeWindow and (bar_index > lastTradeBar) and (strategy.position_size == 0)
    // Bearish Setup: High swept, validated by Bearish FVG and CHoCH
    if highSwept and bearishFVG and (not useChoch or bearishCHoCH)
        entryPrice := close
        stopLossPrice := math.max(high[1], high[2]) // Keep stop loss tight above the sweep structure
        float risk = stopLossPrice - entryPrice
        if risk > 0
            takeProfitPrice := entryPrice - (risk * rrRatio)
            strategy.entry("SMC-Short", strategy.short)
            strategy.exit("Short-Exit", "SMC-Short", stop=stopLossPrice, limit=takeProfitPrice)
            lastTradeBar := bar_index
            highSwept := false // Reset sweep trigger after execution

    // Bullish Setup: Low swept, validated by Bullish FVG and CHoCH
    if lowSwept and bullishFVG and (not useChoch or bullishCHoCH)
        entryPrice := close
        stopLossPrice := math.min(low[1], low[2]) // Keep stop loss tight below the sweep structure
        float risk = entryPrice - stopLossPrice
        if risk > 0
            takeProfitPrice := entryPrice + (risk * rrRatio)
            strategy.entry("SMC-Long", strategy.long)
            strategy.exit("Long-Exit", "SMC-Long", stop=stopLossPrice, limit=takeProfitPrice)
            lastTradeBar := bar_index
            lowSwept := false // Reset sweep trigger after execution

// Visualizing Sweeps and Entries
plotshape(highSwept and not highSwept[1], title="Buy-Side Liquidity Swept", style=shape.triangledown, location=location.abovebar, color=color.red, size=size.small)
plotshape(lowSwept and not lowSwept[1], title="Sell-Side Liquidity Swept", style=shape.triangleup, location=location.belowbar, color=color.blue, size=size.small)