Run a giveaway for your channel subscribers

import random
from clickruntime import on_event, on_trigger, http, credentials, state

CHANNEL = "@mychannel"

def tg(method, **params):
    r = http.post(f"https://api.telegram.org/bot{credentials.secret('TELEGRAM_BOT_TOKEN')}/{method}", json=params)
    r.raise_for_status()
    return r.json()["result"]

@on_event
def join(event):
    msg = (event.json or {}).get("message") or {}
    if msg.get("text", "").strip().lower() != "join":
        return {"joined": False}
    user = msg["from"]
    status = tg("getChatMember", chat_id=CHANNEL, user_id=user["id"])["status"]
    if status not in ("member", "administrator", "creator"):
        tg("sendMessage", chat_id=msg["chat"]["id"], text=f"Subscribe to {CHANNEL} first, then send join again.")
        return {"joined": False}
    entries = state.get("entries") or {}
    entries[str(user["id"])] = user.get("first_name", "someone")
    state.set("entries", entries)
    tg("sendMessage", chat_id=msg["chat"]["id"], text="You're in this week's draw. Good luck!")
    return {"joined": True}

@on_trigger
def draw(event):
    entries = state.get("entries") or {}
    if not entries:
        return {"winner": None}
    winner = random.choice(list(entries.values()))
    tg("sendMessage", chat_id=CHANNEL, text=f"This week's giveaway winner is {winner}! 🎉 ({len(entries)} entries)")
    state.set("entries", {})
    return {"winner": winner, "entries": len(entries)}