Nifty Futures ATM Option Signal

//version=6
indicator('Nifty Futures ATM Option Signal', overlay = true)

// === Input symbols ===
// You must update these to match the live ATM options of current expiry.
niftyFutSymbol = input.symbol('NSE:NIFTY1!', 'Nifty Index Futures')
atmCallSymbol = input.symbol('NSE:NIFTY250605C24750', 'ATM Call Option (Same Expiry)')
atmPutSymbol = input.symbol('NSE:NIFTY250605P24750', 'ATM Put Option (Same Expiry)')

// === Get OHLC values from 5-minute charts ===
niftyOpen = request.security(niftyFutSymbol, '5', open)
niftyClose = request.security(niftyFutSymbol, '5', close)

callOpen = request.security(atmCallSymbol, '5', open)
callClose = request.security(atmCallSymbol, '5', close)

putOpen = request.security(atmPutSymbol, '5', open)
putClose = request.security(atmPutSymbol, '5', close)

// === Candle directions ===
niftyRed = niftyClose < niftyOpen
niftyGreen = niftyClose > niftyOpen
callGreen = callClose > callOpen
putGreen = putClose > putOpen

// === Trading signals ===
buySignal = niftyRed and callGreen
sellSignal = niftyGreen and putGreen

// === Plot signals on chart ===
plotshape(buySignal, title = 'Buy Signal', location = location.belowbar, color = color.green, style = shape.triangleup, size = size.small)
plotshape(sellSignal, title = 'Sell Signal', location = location.abovebar, color = color.red, style = shape.triangledown, size = size.small)

bgcolor(buySignal ? color.new(color.green, 85) : na, title = 'Buy Background')
bgcolor(sellSignal ? color.new(color.red, 85) : na, title = 'Sell Background')