import time
from typing import Iterable, Tuple
from urllib.error import HTTPError, URLError
from urllib.request import Request, urlopen


def get_url_checks(cfg) -> Iterable[Tuple[str, str]]:
    docker_cfg = cfg.get("docker", {})
    containers = docker_cfg.get("containers", {})
    for alias, value in containers.items():
        if isinstance(value, str):
            continue
        if isinstance(value, dict):
            url = value.get("url")
            if url:
                yield alias, url


def check_url(url: str, timeout: int = 5) -> Tuple[bool, int | None, int | None, str | None]:
    start = time.time()
    req = Request(url, headers={"User-Agent": "tg-admin-bot"})
    try:
        with urlopen(req, timeout=timeout) as resp:
            status = int(resp.status)
    except HTTPError as e:
        status = int(e.code)
        elapsed_ms = int((time.time() - start) * 1000)
        return False, status, elapsed_ms, None
    except URLError as e:
        elapsed_ms = int((time.time() - start) * 1000)
        return False, None, elapsed_ms, str(e.reason)
    except Exception as e:
        elapsed_ms = int((time.time() - start) * 1000)
        return False, None, elapsed_ms, str(e)

    elapsed_ms = int((time.time() - start) * 1000)
    ok = status < 400
    return ok, status, elapsed_ms, None