"""Offline intake shared by Windows and Linux desktops. No code is executed."""
import json
import os
import stat
from pathlib import Path

from samsara.core.privacy import minimize_inventory
from samsara.core.storage import require_local_path
from samsara.models.inventory import validate_inventory

MAX_IMPORT_BYTES = 10 * 1024 * 1024


def load_inventory(path):
    local = require_local_path(path)
    flags=os.O_RDONLY|getattr(os,'O_NOFOLLOW',0)|getattr(os,'O_NONBLOCK',0)|getattr(os,'O_BINARY',0)
    with os.fdopen(os.open(local,flags),'rb') as source:
        if not stat.S_ISREG(os.fstat(source.fileno()).st_mode):
            raise ValueError('Only regular local inventory files may be imported.')
        raw = source.read(MAX_IMPORT_BYTES + 1)
    if len(raw) > MAX_IMPORT_BYTES:
        raise ValueError('Inventory exceeds the 10 MiB import limit.')
    try:
        data = json.loads(raw.decode('utf-8-sig'))
    except (ValueError, UnicodeError, RecursionError):
        raise ValueError('The selected file is not valid UTF-8 inventory JSON.') from None
    # A report wrapper is accepted, but its precomputed assessment is never trusted.
    if isinstance(data, dict) and 'inventory_result' in data:
        data = data['inventory_result']
    validate_inventory(data)
    return validate_inventory(minimize_inventory(data))