//@version=5
strategy("21 EMA Scalping Continuation Strategy", overlay=true, initial_capital=10000, default_qty_type=strategy.percent_of_equity, default_qty_value=10)

// Strategy Inputs
emaLength = input.int(21, title="EMA Period")
rrRatio   = input.float(1.5, title="Risk to Reward Ratio", step=0.1)
maxBars   = input.int(3, title="Max Bars for Pullback", minval=1, maxval=5)

// Technical Indicators
emaVal = ta.ema(close, emaLength)
plot(emaVal, color=color.blue, linewidth=2, title="21 EMA")

// Persistent State Variables
var int longState = 0        // Counts bars after bullish EMA crossover
var float longLevel = na    // Entry high level
var float longSL = na       // Stop loss level

var int shortState = 0       // Counts bars after bearish EMA crossunder
var float shortLevel = na   // Entry low level
var float shortSL = na      // Stop loss level

// Cross Signals
bullCross = ta.crossover(close, emaVal)
bearCross = ta.crossunder(close, emaVal)

// --- BULLISH SETUP LOGIC ---
if bullCross
    longState := 1
    longLevel := na
    longSL := na
else if longState > 0
    if close < emaVal or longState > maxBars
        longState := 0
        longLevel := na
        longSL := na
    else
        longState := longState + 1

// Identify opposite color candle (red candle) during active bullish state
if longState > 0 and close < open
    longLevel := high
    longSL := low

// Execute Long Orders
if longState > 0 and not na(longLevel) and strategy.position_size == 0
    risk = longLevel - longSL
    if risk > 0
        tpLevel = longLevel + (risk * rrRatio)
        strategy.entry("EMA_Long", strategy.long, stop=longLevel)
        strategy.exit("Exit_Long", "EMA_Long", stop=longSL, limit=tpLevel)

// Reset long state upon position entry
if strategy.position_size > 0
    longState := 0
    longLevel := na
    longSL := na

// --- BEARISH SETUP LOGIC ---
if bearCross
    shortState := 1
    shortLevel := na
    shortSL := na
else if shortState > 0
    if close > emaVal or shortState > maxBars
        shortState := 0
        shortLevel := na
        shortSL := na
    else
        shortState := shortState + 1

// Identify opposite color candle (green candle) during active bearish state
if shortState > 0 and close > open
    shortLevel := low
    shortSL := high

// Execute Short Orders
if shortState > 0 and not na(shortLevel) and strategy.position_size == 0
    risk = shortSL - shortLevel
    if risk > 0
        tpLevel = shortLevel - (risk * rrRatio)
        strategy.entry("EMA_Short", strategy.short, stop=shortLevel)
        strategy.exit("Exit_Short", "EMA_Short", stop=shortSL, limit=tpLevel)

// Reset short state upon position entry
if strategy.position_size < 0
    shortState := 0
    shortLevel := na
    shortSL := na