from prometheus_client import start_http_server, Gauge
import urllib.request
import re
import time
import yaml

# Create a metric to track the number of registered users per domain
registered_users_gauge = Gauge(
    "piped_registered_users", "Number of registered users", ["domain"]
)

headers = {
    "User-Agent": "Mozilla/5.0 (compatible; prometheus-piped/dev; +https://git.private.coffee/PrivateCoffee/prometheus-piped)",
}


def fetch_registered_users(domain):
    try:
        # Construct the full API URL
        api_url = f"https://{domain}/registered/badge"
        # Fetch the badge URL
        req = urllib.request.Request(api_url, headers=headers)
        with urllib.request.urlopen(req) as response:
            final_url = response.geturl()
            # Extract the number of registered users from the redirect URL
            match = re.search(r"Registered%20Users-(\d+)-blue", final_url)
            if match:
                return int(match.group(1))
    except Exception as e:
        print(f"Error fetching registered users from {domain}: {e}")
    return False


def update_registered_users(domains, update_interval):
    while True:
        for domain in domains:
            # Fetch the number of registered users and update the gauge
            registered_users = fetch_registered_users(domain)
            if registered_users:
                registered_users_gauge.labels(domain=domain).set(registered_users)
        # Sleep for a while before fetching the data again
        time.sleep(update_interval)


if __name__ == "__main__":
    # Load configuration from YAML file
    with open("config.yaml", "r") as file:
        config = yaml.safe_load(file)

    domains = config["piped"]
    update_interval = config.get("update_interval", 60)

    # Start up the server to expose the metrics
    start_http_server(8098)
    # Update the registered users gauge periodically
    update_registered_users(domains, update_interval)