"""EventBridge-triggered Lambda: sends a Telegram reminder then deletes the rule."""
import json
import os
import boto3
import urllib.request


def handler(event, context):
    chat_id = event['chat_id']
    message = event['message']
    rule_name = event['rule_name']

    # Fetch bot token
    sm = boto3.client('secretsmanager', region_name='us-east-1')
    token = sm.get_secret_value(SecretId=os.environ['TELEGRAM_BOT_TOKEN_SECRET_ARN'])['SecretString']

    # Send Telegram message
    payload = json.dumps({'chat_id': chat_id, 'text': message}).encode()
    req = urllib.request.Request(
        f'https://api.telegram.org/bot{token}/sendMessage',
        data=payload,
        headers={'Content-Type': 'application/json'},
    )
    urllib.request.urlopen(req)

    # Delete the one-time rule
    eb = boto3.client('events', region_name='us-east-1')
    eb.remove_targets(Rule=rule_name, Ids=['scheduler'])
    eb.delete_rule(Name=rule_name)