Watermellon.pine

//@version=6
indicator("Watermellon", overlay=true)

//========== INPUTS ==========
emaFastLen  = input.int(8,  "Fast EMA", minval=1)
emaMidLen   = input.int(21, "Mid EMA",  minval=1)
emaSlowLen  = input.int(48, "Slow EMA", minval=1)
rsiLen      = input.int(14, "RSI Length", minval=2)
rsiMinLong  = input.float(42.0, "Min RSI for long look", step=0.1)
rsiMaxShort = input.float(58.0, "Max RSI for short look", step=0.1)

//========== CORE SERIES ==========
fastEma = ta.ema(close, emaFastLen)
midEma  = ta.ema(close, emaMidLen)
slowEma = ta.ema(close, emaSlowLen)
rsiVal  = ta.rsi(close, rsiLen)

//========== PLOTS (price stuff only) ==========
plot(fastEma, title="EMA Fast", color=color.new(color.orange, 0))
plot(midEma,  title="EMA Mid",  color=color.new(color.teal, 0))
plot(slowEma, title="EMA Slow", color=color.new(color.purple, 0))

//========== TREND STATES ==========
bullStack = fastEma > midEma and midEma > slowEma
bearStack = fastEma < midEma and midEma < slowEma

//========== SIGNALS (LOOSE) ==========
longLook  = bullStack and rsiVal > rsiMinLong
shortLook = bearStack and rsiVal < rsiMaxShort

// trigger once
longTrig  = longLook and not longLook[1]
shortTrig = shortLook and not shortLook[1]

//========== MARKERS ==========
plotshape(longTrig,  title="BUY",  style=shape.labelup,   text="BUY",  color=color.new(color.green, 0), location=location.belowbar, size=size.tiny)
plotshape(shortTrig, title="SELL", style=shape.labeldown, text="SELL", color=color.new(color.red, 0),   location=location.abovebar, size=size.tiny)

//========== ALERTS ==========
alertcondition(longTrig,  title="BUY signal",  message="BUY signal on {{ticker}}")
alertcondition(shortTrig, title="SELL signal", message="SELL signal on {{ticker}}")