feat: add promo codes and conditional events (#40)

* add extra column
* add conditional events
* refunds
* conditional events working
* adding promo codes
* promo codes logic

---------

Co-authored-by: dni ⚡ <office@dnilabs.com>

services.py

@@ -1,4 +1,13 @@
-from .crud import get_event, update_event, update_ticket
+from lnurl import execute
+from loguru import logger
+
+from .crud import (
+    get_event,
+    get_event_tickets,
+    purge_unpaid_tickets,
+    update_event,
+    update_ticket,
+)
 from .models import Ticket
 
 
@@ -16,3 +25,30 @@ async def set_ticket_paid(ticket: Ticket) -> Ticket:
     await update_event(event)
 
     return ticket
+
+
+async def refund_tickets(event_id: str):
+    """
+    Refund tickets for an event that has not met the minimum ticket requirement.
+    This function should be called when the event is closed and the minimum ticket
+    condition is not met.
+    """
+    await purge_unpaid_tickets(event_id)
+    tickets = await get_event_tickets(event_id)
+
+    if not tickets:
+        return
+
+    for ticket in tickets:
+        if ticket.extra.refunded:
+            continue
+        if ticket.paid and ticket.extra.refund_address and ticket.extra.sats_paid:
+            try:
+                res = await execute(
+                    ticket.extra.refund_address, str(ticket.extra.sats_paid)
+                )
+                if res:
+                    ticket.extra.refunded = True
+                    await update_ticket(ticket)
+            except Exception as e:
+                logger.error(f"Error refunding ticket {ticket.id}: {e}")