Doc01 MACD Zero Pullback EMA20 - Project Adapted

//@version=6
strategy("Doc01 MACD Zero Pullback EMA20 - Project Adapted", overlay=true, pyramiding=0, initial_capital=10000)

// Source: user-provided strategy collection - strategy 1
// Logic summary:
// 1. Trade long only when price pulls back near EMA20 and then closes back above it.
// 2. MACD must hold above the zero axis.
// 3. Volume should contract during the pullback.
// 4. Avoid obvious high-ADX one-way extension risk.
// 5. Exit when EMA20 support fails, ATR stop/target is hit, or momentum deteriorates.
// Compile confidence: 93/100. Profit confidence: 28/100.

emaLen = input.int(20, "EMA20 length", minval=1)
trendLen = input.int(55, "Trend EMA length", minval=2)
pullbackPct = input.float(0.35, "EMA pullback tolerance %", minval=0.01, step=0.05)
volLen = input.int(20, "Volume average length", minval=2)
volContract = input.float(0.95, "Volume contraction ratio", minval=0.1, step=0.05)
adxLen = input.int(14, "ADX length", minval=2)
maxAdx = input.float(45.0, "Max ADX before no-trade", minval=5.0, step=0.5)
atrLen = input.int(14, "ATR length", minval=1)
stopAtr = input.float(1.8, "Stop ATR", minval=0.1, step=0.1)
targetAtr = input.float(3.0, "Target ATR", minval=0.1, step=0.1)

ema20 = ta.ema(close, emaLen)
emaTrend = ta.ema(close, trendLen)
[macdLine, macdSignal, macdHist] = ta.macd(close, 12, 26, 9)
[pdi, mdi, adx] = ta.dmi(adxLen, adxLen)
atr = ta.atr(atrLen)
volBase = ta.sma(volume, volLen)

trendUp = close > emaTrend and ema20 > emaTrend
nearEma = low <= ema20 * (1 + pullbackPct / 100.0) and close >= ema20
macdHoldsZero = macdLine > 0 and macdSignal > 0 and macdHist >= macdHist[1]
volumeShrinks = volume <= volBase * volContract
stableMarket = adx <= maxAdx

longSignal = strategy.position_size == 0 and trendUp and nearEma and macdHoldsZero and volumeShrinks and stableMarket

if longSignal
    strategy.entry("Long", strategy.long)

if strategy.position_size > 0
    strategy.exit("Long Risk", "Long", stop=strategy.position_avg_price - atr * stopAtr, limit=strategy.position_avg_price + atr * targetAtr)

exitWeak = strategy.position_size > 0 and close < ema20 and macdLine < macdSignal
if exitWeak
    strategy.close("Long")