EMA Cross [trugurpala]

//@version=6
// EMA Cross Indicator — github.com/trugurpala/pinescriptv6
// Author: Ugur Pala · mail@ugurpala.com
// Evidence: structural-only; no TradingView compile/chart record exists.
// Uses chart-timeframe values only; no request.*() call is made.
// bullCross/bearCross use developing chart-timeframe values on an open realtime bar;
// the condition and marker can change before close.
// alertcondition() exposes UI-selectable conditions; frequency is selected in TradingView Create Alert.
// Choosing bar-close delivery addresses timing only, not a blanket repaint verdict.
indicator("EMA Cross [trugurpala]", overlay=true)

// ── Inputs ──────────────────────────────────────────────────────────────────
int  fastLen = input.int(9,  "Fast EMA", minval=1)
int  slowLen = input.int(21, "Slow EMA", minval=1)
bool showBg  = input.bool(true, "Background Color")

// ── Calculations ─────────────────────────────────────────────────────────────
float fastEma  = ta.ema(close, fastLen)
float slowEma  = ta.ema(close, slowLen)
bool  bullCross = ta.crossover(fastEma,  slowEma)
bool  bearCross = ta.crossunder(fastEma, slowEma)
bool  isBull    = fastEma > slowEma

// ── Visuals ──────────────────────────────────────────────────────────────────
plot(fastEma, "Fast EMA", isBull ? color.green : color.red,    linewidth=2)
plot(slowEma, "Slow EMA", isBull ? color.lime  : color.orange, linewidth=2)
bgcolor(showBg ? (isBull ? color.new(color.green, 93) : color.new(color.red, 93)) : na)
plotshape(bullCross, "Bull", shape.triangleup,   location.belowbar, color.green, size=size.small)
plotshape(bearCross, "Bear", shape.triangledown, location.abovebar, color.red,   size=size.small)

// ── Alerts ───────────────────────────────────────────────────────────────────
alertcondition(bullCross, "Bull Cross", "EMA Bull Cross — {{ticker}} @ {{close}}")
alertcondition(bearCross, "Bear Cross", "EMA Bear Cross — {{ticker}} @ {{close}}")