SMC Order Block + FVG

// This Pine Script v5 strategy is licensed under the MIT License
// Tested with Backtrex (https://backtrex.com) on 10 years of M1 data
// Anti-repainting: all references use close[1]
// SMC/ICT Strategy: Order Block + Fair Value Gap confluence

//@version=5
strategy("SMC Order Block + FVG", overlay=true, default_qty_type=strategy.percent_of_equity, default_qty_value=2, max_bars_back=500)

// Inputs
obLookback = input.int(20, "Order Block Lookback")
fvgMinSize = input.float(0.5, "Min FVG Size (ATR multiplier)")
atrLen = input.int(14, "ATR Length")
bosLookback = input.int(50, "BOS Lookback Period")

// ATR for dynamic sizing
atr = ta.atr(atrLen)

// ============ BREAK OF STRUCTURE (BOS) ============
// Using close[1] for all calculations
swingHigh = ta.pivothigh(high[1], 5, 5)
swingLow = ta.pivotlow(low[1], 5, 5)

var float lastSwingHigh = na
var float lastSwingLow = na
var bool bullBOS = false
var bool bearBOS = false

if not na(swingHigh)
    lastSwingHigh := swingHigh

if not na(swingLow)
    lastSwingLow := swingLow

// BOS detection
bullBOS := close[1] > lastSwingHigh and close[2] <= lastSwingHigh
bearBOS := close[1] < lastSwingLow and close[2] >= lastSwingLow

// ============ ORDER BLOCKS ============
// Bullish OB: last bearish candle before a strong bullish move
var float bullOBTop = na
var float bullOBBottom = na
var bool bullOBActive = false

// Bearish OB: last bullish candle before a strong bearish move
var float bearOBTop = na
var float bearOBBottom = na
var bool bearOBActive = false

// Detect strong moves (3+ ATR)
strongBullMove = close[1] - open[1] > atr * 2
strongBearMove = open[1] - close[1] > atr * 2

// Find OB (last opposite candle before strong move)
if strongBullMove and close[2] < open[2]
    bullOBTop := open[2]
    bullOBBottom := close[2]
    bullOBActive := true

if strongBearMove and close[2] > open[2]
    bearOBTop := close[2]
    bearOBBottom := open[2]
    bearOBActive := true

// ============ FAIR VALUE GAPS ============
// Bullish FVG: gap between bar[3].high and bar[1].low
bullFVG = low[1] > high[3] and (low[1] - high[3]) > atr * fvgMinSize
bearFVG = high[1] < low[3] and (low[3] - high[1]) > atr * fvgMinSize

var bool recentBullFVG = false
var bool recentBearFVG = false

if bullFVG
    recentBullFVG := true

if bearFVG
    recentBearFVG := true

// Reset FVG flag after 20 bars
if ta.barssince(bullFVG) > 20
    recentBullFVG := false

if ta.barssince(bearFVG) > 20
    recentBearFVG := false

// ============ ENTRY CONDITIONS ============
// Long: price retraces to bullish OB zone + recent bullish FVG + bullish BOS
longCondition = bullOBActive and recentBullFVG and low[1] <= bullOBTop and low[1] >= bullOBBottom and ta.barssince(bullBOS) < 30

// Short: price retraces to bearish OB zone + recent bearish FVG + bearish BOS
shortCondition = bearOBActive and recentBearFVG and high[1] >= bearOBBottom and high[1] <= bearOBTop and ta.barssince(bearBOS) < 30

// Execute trades
if longCondition
    sl = bullOBBottom - atr * 0.5
    tp = lastSwingHigh
    strategy.entry("Long", strategy.long)
    strategy.exit("Long Exit", "Long", stop=sl, limit=tp)
    bullOBActive := false

if shortCondition
    sl = bearOBTop + atr * 0.5
    tp = lastSwingLow
    strategy.entry("Short", strategy.short)
    strategy.exit("Short Exit", "Short", stop=sl, limit=tp)
    bearOBActive := false

// ============ PLOTS ============
plotshape(longCondition, "Long Signal", shape.triangleup, location.belowbar, color.green, size=size.small)
plotshape(shortCondition, "Short Signal", shape.triangledown, location.abovebar, color.red, size=size.small)