Pinescript condition alert ohlc and muti ema

help code pinescript condition for alerts

when true use open high low close 15min, 30min, 60min, 240min with 4 ema.

able to change ema add input box.

want to combine two indicators in tradingview.

able to add alerts in for conditions.

example if previous bar 60min close > ema x if true send condition alert.

input

conditions

1ema

checkbox 15min checkbox 30min checkbox 60min checkbox 240min

checkbox ohlc condition

2ema

checkbox 15min checkbox 30min checkbox 60min checkbox 240min

3ema

checkbox 15min checkbox 30min checkbox 60min checkbox 240min

4ema

checkbox 15min checkbox 30min checkbox 60min checkbox 240min

something like this example to automate check conditions for alert.

if alert true send conditions.

input able to change ema.

input able to change lookback bars for ohlc.