//@version=5
indicator("Börsenampel", overlay=true)

// Einstellbare Parameter
ma21_length = input.int(21, minval=1, title="Länge des gleitenden Durchschnitts (Preis)")
spx_ma50_length = input.int(50, minval=1, title="Länge des gleitenden Durchschnitts (SPX)")

// Berechnung der gleitenden Durchschnitte
price_ma21 = ta.sma(close, ma21_length)
spx = request.security("SP:SPX", "D", close)
spx_ma50 = ta.sma(spx, spx_ma50_length)

// Berechnung des Vortageskurses und des Volumens sowie der prozentualen Veränderung
yesterday_close = request.security(syminfo.tickerid, "D", close[1])
yesterday_volume = request.security(syminfo.tickerid, "D", volume[1])
price_change = (close - yesterday_close) / yesterday_close * 100

// Logik für die Hintergrundfarbe
isPriceBelowMA = close < price_ma21
isSPXBelowMA50 = spx < spx_ma50
isPriceFalling = price_change <= -0.5

bgcolor(isSPXBelowMA50 ? color.red : (isPriceBelowMA and isPriceFalling ? color.yellow : na), transp=90)

// "Follow Through Day"-Signal
isFollowThroughDay = price_change > 1.25 and volume > yesterday_volume
plotshape(series=isFollowThroughDay, location=location.belowbar, color=color.green, style=shape.triangledown, text="FTD", textcolor=color.green)

// "Distribution Day"-Signal
isDistributionDay = price_change < -0.2 and volume > yesterday_volume
plotshape(series=isDistributionDay, location=location.abovebar, color=color.red, style=shape.triangledown, text="DD", textcolor=color.red)