import ctrl.db as db
import ctrl.settings as settings
import requests


def parse_worker(spec):
    """'host:port' -> {'url': 'http://host:port', 'host': host, 'port': port}."""
    host, _, port = spec.strip().rpartition(":")
    if not host or not port.isdigit():
        raise ValueError(f"Invalid worker spec: {spec!r} (expected host:port)")
    return {"url": f"http://{host}:{port}", "host": host, "port": int(port)}


def configured_workers():
    out = []
    for w in db.list_workers():
        out.append({
            "url": f"http://{w['host']}:{w['port']}",
            "host": w["host"],
            "port": w["port"],
        })
    return out


def probe_worker(url, timeout=None):
    """Return a normalized worker status dict, or None if unreachable."""
    timeout = timeout or settings.WORKER_STATUS_TIMEOUT
    try:
        resp = requests.get(f"{url}/status", timeout=timeout)
        resp.raise_for_status()
        info = resp.json()
    except (requests.RequestException, ValueError):
        return None

    info["url"] = url
    info["online"] = True
    return info


def probe_all():
    workers = []
    for w in configured_workers():
        status = probe_worker(w["url"])
        if status:
            workers.append(status)
        else:
            workers.append({"url": w["url"], "host": w["host"], "port": w["port"], "online": False})
    return workers


def matches(job, worker):
    if worker.get("status") != "ready":
        return False
    if job.get("os_req") and job["os_req"].lower() not in str(worker.get("os", "")).lower():
        return False
    if job.get("cpu_req") and job["cpu_req"].lower() not in str(worker.get("cpu", "")).lower():
        return False
    return True