import json
import logging
from datetime import datetime, timezone
from urllib.parse import urlsplit, urlunsplit


SAFE_EXTRA = ("monitor_id", "url", "status", "http_status", "latency_ms", "error")


def redact_url(value: str) -> str:
    try:
        parts = urlsplit(value)
        host = parts.hostname or ""
        if parts.port:
            host = f"{host}:{parts.port}"
        return urlunsplit((parts.scheme, host, parts.path, "", ""))
    except (TypeError, ValueError):
        return "[invalid-url]"


class JsonFormatter(logging.Formatter):
    def format(self, record: logging.LogRecord) -> str:
        payload: dict[str, object] = {
            "timestamp": datetime.now(timezone.utc).isoformat(),
            "level": record.levelname,
            "logger": record.name,
            "event": record.getMessage(),
        }
        for key in SAFE_EXTRA:
            if hasattr(record, key):
                value = getattr(record, key)
                payload[key] = redact_url(str(value)) if key == "url" else value
        return json.dumps(payload, separators=(",", ":"), default=str)


def configure_logging(level: str) -> None:
    handler = logging.StreamHandler()
    handler.setFormatter(JsonFormatter())
    root = logging.getLogger()
    root.handlers = [handler]
    root.setLevel(level.upper())