EMA Crossover + Candle Pattern Alert

I would like to build a trading bot alert in PineScript that performs the following:

9-15 EMA Crossover:

When the 9-period EMA crosses above the 15-period EMA, it's a bullish signal.
When the 9-period EMA crosses below the 15-period EMA, it's a bearish signal.
Candle Pattern Confirmation:

After a bullish crossover, check for any of the following bullish candle patterns in the next 3 or 5 minutes:
Hammer
Bullish Engulfing
Morning Star
Bullish Piercing Pattern
If any of these patterns are detected, trigger an alert