4H Crypto System – EMAs + MACD

//version=5
indicator("4H Crypto System – EMAs + MACD", overlay=true)

// EMAs
ema21 = ta.ema(close, 21)
ema50 = ta.ema(close, 50)
ema200 = ta.ema(close, 200)

// MACD Settings (standard)
fastLength = 12
slowLength = 26
signalLength = 9

[macdLine, signalLine, _] = ta.macd(close, fastLength, slowLength, signalLength)

// Plot EMAs
plot(ema21, title="EMA 21", color=color.orange, linewidth=1)
plot(ema50, title="EMA 50", color=color.blue, linewidth=1)
plot(ema200, title="EMA 200", color=color.purple, linewidth=1)

// Candle coloring based on MACD trend
macdBull = macdLine > signalLine
barcolor(macdBull ? color.new(color.green, 0) : color.new(color.red, 0))

// Buy/Sell signal conditions
buySignal = ta.crossover(macdLine, signalLine) and close > ema21 and close > ema50 and close > ema200
sellSignal = ta.crossunder(macdLine, signalLine) and close < ema21 and close < ema50 and close < ema200

// Alerts
alertcondition(buySignal, title="Buy Alert", message="Buy Signal: MACD bullish crossover and price above EMAs")
alertcondition(sellSignal, title="Sell Alert", message="Sell Signal: MACD bearish crossover and price below EMAs")