import logging
from pathlib import Path

from django.conf import settings

from ..models import Camera


logger = logging.getLogger('camlaps')


def _storage_root() -> Path:
    storage_path = getattr(settings, 'STORAGE_PATH', None)
    if storage_path is None:
        return Path('/app/storage')
    return Path(storage_path)


def is_storage_available() -> bool:
    logger.info('cameras:storage_available:start')
    try:
        root = _storage_root()
        ok = root.exists() and root.is_dir()
        logger.info('cameras:storage_available:done ok=%s', ok)
        return ok
    except Exception:
        logger.exception('cameras:storage_available:error')
        raise


def list_active_cameras() -> list[Camera]:
    logger.info('cameras:list_active:start')
    try:
        cameras = list(Camera.objects.filter(is_active=True).order_by('name'))
        logger.info('cameras:list_active:done count=%s', len(cameras))
        return cameras
    except Exception:
        logger.exception('cameras:list_active:error')
        raise


def get_camera_lastsnap_path(camera: Camera) -> Path | None:
    logger.info('cameras:lastsnap_path:start camera_id=%s', camera.id)
    try:
        root = _storage_root().resolve()
        candidate = (root / camera.storage_path / 'lastsnap.jpg').resolve()

        if candidate != root and root not in candidate.parents:
            logger.info('cameras:lastsnap_path:done camera_id=%s found=false', camera.id)
            return None

        if not candidate.exists() or not candidate.is_file():
            logger.info('cameras:lastsnap_path:done camera_id=%s found=false', camera.id)
            return None

        logger.info('cameras:lastsnap_path:done camera_id=%s found=true', camera.id)
        return candidate
    except Exception:
        logger.exception('cameras:lastsnap_path:error camera_id=%s', camera.id)
        raise