EMA Crossover

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © claygrace74

//@version=6
indicator("EMA Crossover", shorttitle="EMA Cross", overlay=true)

// ==================== Settings ====================
var ema_group = "EMA Settings"
ema_src   = input.source(close, "Source", group=ema_group)
ema_f_len = input.int(10, "Fast EMA Length", minval=1, group=ema_group)
ema_s_len = input.int(20, "Slow EMA Length", minval=1, group=ema_group)

var disp_group = "Display Settings"
i_showFill    = input.bool(true, "Show EMA Fill", group=disp_group)
i_showSignals = input.bool(true, "Show Cross Signals", group=disp_group)
i_showTP_SL   = input.bool(false, "Show TP/SL Reference Lines", group=disp_group)
tpPct         = input.float(3.0, "Take Profit %", minval=0.1, step=0.5, group=disp_group)
slPct         = input.float(1.0, "Stop Loss %", minval=0.1, step=0.5, group=disp_group)
fastColor     = input.color(color.green, "Fast EMA Color", group=disp_group)
slowColor     = input.color(color.red, "Slow EMA Color", group=disp_group)

// ==================================================================================
// Core Calculations
// ==================================================================================
ema_f = ta.ema(ema_src, ema_f_len)
ema_s = ta.ema(ema_src, ema_s_len)

bullish   = ema_f > ema_s
crossUp   = ta.crossover(ema_f, ema_s)
crossDown = ta.crossunder(ema_f, ema_s)

// Trend strength — distance between EMAs relative to ATR
atr     = ta.atr(14)
spread  = math.abs(ema_f - ema_s)
strong  = spread > atr * 1.5

// TP/SL reference levels from last cross
var float lastCrossPrice = na
if crossUp or crossDown
    lastCrossPrice := close

tp_long  = lastCrossPrice * (1 + tpPct / 100)
sl_long  = lastCrossPrice * (1 - slPct / 100)
tp_short = lastCrossPrice * (1 - tpPct / 100)
sl_short = lastCrossPrice * (1 + slPct / 100)

// ==================================================================================
// Plots
// ==================================================================================
pFast = plot(ema_f, "Fast EMA", color=fastColor, linewidth=2)
pSlow = plot(ema_s, "Slow EMA", color=slowColor, linewidth=2)

fill_clr = i_showFill ? (bullish ? color.new(color.green, 80) : color.new(color.red, 80)) : color(na)
fill(pFast, pSlow, color=fill_clr, title="EMA Fill")

// Cross signals
plotshape(i_showSignals and crossUp,   style=shape.triangleup,   location=location.belowbar, color=color.green, text="Long",  textcolor=color.green, size=size.small, title="Bull Cross")
plotshape(i_showSignals and crossDown, style=shape.triangledown, location=location.abovebar, color=color.red,   text="Short", textcolor=color.red,   size=size.small, title="Bear Cross")

// TP/SL reference lines
plot(i_showTP_SL and bullish ? tp_long : na,  "TP Long",  color=color.new(color.lime, 50), style=plot.style_linebr, linewidth=1)
plot(i_showTP_SL and bullish ? sl_long : na,  "SL Long",  color=color.new(color.orange, 50), style=plot.style_linebr, linewidth=1)
plot(i_showTP_SL and not bullish ? tp_short : na, "TP Short", color=color.new(color.lime, 50), style=plot.style_linebr, linewidth=1)
plot(i_showTP_SL and not bullish ? sl_short : na, "SL Short", color=color.new(color.orange, 50), style=plot.style_linebr, linewidth=1)

// Trend direction background
bgcolor(strong and bullish ? color.new(color.green, 95) : strong and not bullish ? color.new(color.red, 95) : na, title="Strong Trend BG")

// ==================================================================================
// Alert Conditions
// ==================================================================================
alertcondition(crossUp,                "Bullish EMA Cross",     "Fast EMA crossed above slow EMA")
alertcondition(crossDown,              "Bearish EMA Cross",     "Fast EMA crossed below slow EMA")
alertcondition(crossUp and strong,     "Strong Bullish Cross",  "Bullish EMA cross with strong trend spread")
alertcondition(crossDown and strong,   "Strong Bearish Cross",  "Bearish EMA cross with strong trend spread")