import json

from edge.detectors.zone import Zone


def zones_from_config(config: dict, camera_id: str | None = None) -> list[Zone]:
    """Parse cloud config zone rows into Zone objects. When camera_id is given, only
    rows for that camera are kept (multi-camera routing); None keeps all rows."""
    out: list[Zone] = []
    rows = config.get("zones", []) or []
    if not isinstance(rows, list):
        return []
    for row in rows:
        try:
            if camera_id is not None and str(row["camera_id"]) != str(camera_id):
                continue
            raw = row["polygon_json"]
            pts = json.loads(raw) if isinstance(raw, str) else raw
            polygon = [(float(p[0]), float(p[1])) for p in pts]
            if len(polygon) < 3:
                continue
            out.append(Zone(str(row["zone_id"]), str(row["level"]), polygon))
        except (KeyError, ValueError, TypeError, IndexError, AttributeError, json.JSONDecodeError):
            continue
    return out


def thresholds_from_config(config: dict) -> dict:
    t = config.get("thresholds")
    return t if isinstance(t, dict) else {}