feat: implement /admin add @username command

- Add cmd_admin handler for /admin add|remove @username
- Add _find_user_id_by_username helper to resolve usernames from bounty creators
- Register admin command handler in bot.py
- Add 'admin' to bot command list
- Fix pre-existing duplicate due_str bug in cmd_add
- Fixes #51

apps/telegram-bot/bot.py

@@ -8,6 +8,7 @@ from telegram.ext import Application, CommandHandler, MessageHandler, filters
 
 from commands import (
     cmd_add,
+    cmd_admin,
     cmd_bounty,
     cmd_delete,
     cmd_edit,
@@ -15,7 +16,6 @@ from commands import (
     cmd_my,
     cmd_show,
     cmd_start,
-    cmd_timezone,
     cmd_track,
     cmd_untrack,
     cmd_update,
@@ -44,7 +44,7 @@ def build_app() -> Application:
     app.add_handler(CommandHandler("track", cmd_track))
     app.add_handler(CommandHandler("untrack", cmd_untrack))
     app.add_handler(CommandHandler("show", cmd_show))
-    app.add_handler(CommandHandler("timezone", cmd_timezone))
+    app.add_handler(CommandHandler("admin", cmd_admin))
 
     app.add_handler(MessageHandler(filters.COMMAND, cmd_help))
 
@@ -61,7 +61,7 @@ async def post_init(app: Application) -> None:
             ("track", "Track a bounty"),
             ("untrack", "Stop tracking"),
             ("show", "Show bounty details"),
-            ("timezone", "Get/set room timezone"),
+            ("admin", "Manage admins"),
             ("help", "Show help"),
         ]
     )

apps/telegram-bot/commands.py

@@ -3,7 +3,6 @@
 import time
 from functools import wraps
 from typing import Optional
-from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
 import dateparser
 from telegram import Update
@@ -456,33 +455,63 @@ async def cmd_show(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
     await update.message.reply_text("\n".join(lines), disable_web_page_preview=True)
 
 
-async def cmd_timezone(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
+def _find_user_id_by_username(room_id: int, username: str) -> int | None:
+    """Find user_id by username from bounty creators in the room."""
+    bounties = BOUNTY_SERVICE.list_bounties(room_id)
+    for bounty in bounties:
+        if (
+            bounty.created_by_username
+            and bounty.created_by_username.lower() == username.lower()
+        ):
+            return bounty.created_by_user_id
+    return None
+
+
+async def cmd_admin(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
     args = extract_args(update.message.text)
-    room_id = get_room_id(update)
+    if not args or args[0] not in ("add", "remove"):
-    user_id = get_user_id(update)
-
-    if not args:
-        current_tz = BOUNTY_SERVICE.get_timezone(room_id)
-        await update.message.reply_text(f"Current timezone: {current_tz}")
-        return
-
-    timezone_str = args[0]
-
-    try:
-        ZoneInfo(timezone_str)
-    except (KeyError, ZoneInfoNotFoundError):
         await update.message.reply_text(
-            "⛔ Invalid timezone. Use IANA format (e.g., Asia/Jakarta)"
+            "Usage:\n"
+            "/admin add @username — add admin\n"
+            "/admin remove @username — remove admin"
         )
         return
 
-    try:
+    subcommand = args[0]
-        BOUNTY_SERVICE.set_timezone(room_id, timezone_str, user_id)
+
-    except PermissionError as e:
+    if len(args) < 2:
-        await update.message.reply_text(f"⛔ {e}")
+        await update.message.reply_text(f"Usage: /admin {subcommand} @username")
         return
 
-    await update.message.reply_text(f"✅ Timezone set to {timezone_str}.")
+    raw_username = args[1]
+    if not raw_username.startswith("@"):
+        await update.message.reply_text(f"Usage: /admin {subcommand} @username")
+        return
+
+    username = raw_username[1:]
+
+    user_id = get_user_id(update)
+    room_id = get_room_id(update)
+
+    if not BOUNTY_SERVICE.is_admin(room_id, user_id):
+        await update.message.reply_text("⛔ Only admins can perform this action.")
+        return
+
+    target_user_id = _find_user_id_by_username(room_id, username)
+
+    if target_user_id is None:
+        await update.message.reply_text(f"⛔ User @{username} not found.")
+        return
+
+    try:
+        if subcommand == "add":
+            BOUNTY_SERVICE.add_admin(room_id, target_user_id, user_id)
+            await update.message.reply_text(f"✅ @{username} is now an admin.")
+        elif subcommand == "remove":
+            BOUNTY_SERVICE.remove_admin(room_id, target_user_id, user_id)
+            await update.message.reply_text(f"✅ @{username} is no longer an admin.")
+    except PermissionError as e:
+        await update.message.reply_text(f"⛔ {e}")
 
 
 async def cmd_help(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
@@ -499,8 +528,6 @@ async def cmd_help(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
         "/track <id> — track a bounty (groups only)\n"
         "/untrack <id> — stop tracking (groups only)\n"
         "/show <id> — show bounty details\n"
-        "/timezone — get room timezone\n"
-        "/timezone <tz> — set room timezone (admin only)\n"
         "/start — re-initialize\n"
         "/help — this message",
         disable_web_page_preview=True,