"""OS identification and explicit profile checks; never probes a remote host."""
from pathlib import Path
import platform
import shlex

PROFILES = [
    ('Auto-detect', 'auto'),
    ('Windows Server 2016', 'windows:2016'),
    ('Windows Server 2019', 'windows:2019'),
    ('Windows Server 2022', 'windows:2022'),
    ('Windows Server 2025', 'windows:2025'),
    ('Red Hat Enterprise Linux 7 (legacy)', 'rhel:7'),
    ('Red Hat Enterprise Linux 8', 'rhel:8'),
    ('Red Hat Enterprise Linux 9', 'rhel:9'),
    ('Red Hat Enterprise Linux 10', 'rhel:10'),
    ('RHEL-compatible Linux', 'rhel:any'),
]


def detect_local_os():
    system = platform.system()
    if system == 'Linux':
        release = {}
        for line in Path('/etc/os-release').read_text(encoding='utf-8').splitlines():
            if '=' in line:
                key, value = line.split('=', 1)
                release[key] = ' '.join(shlex.split(value))
        distro = release.get('ID', '')
        related = set(release.get('ID_LIKE', '').split())
        rhel = distro in {'rhel', 'rocky', 'almalinux', 'centos', 'ol'} or 'rhel' in related
        return {'platform': 'linux', 'family': 'rhel' if rhel else 'linux',
                'version': release.get('VERSION_ID', '').split('.')[0],
                'name': release.get('PRETTY_NAME', 'Linux')}
    if system == 'Windows':
        # Do not infer a Server edition from a desktop kernel/build number.
        return {'platform': 'windows', 'family': 'windows', 'version': '',
                'name': 'Windows ' + platform.win32_ver()[0]}
    raise ValueError('Local collection is available on Linux. Import an inventory file for other platforms.')


def check_profile(detected, profile):
    if profile == 'auto':
        return
    valid = {value for _, value in PROFILES}
    if profile not in valid:
        raise ValueError('Unknown operating system profile.')
    family, version = profile.split(':')
    if detected['family'] != family or (version != 'any' and detected['version'] != version):
        raise ValueError(f"Detected {detected['name']}, which does not match the selected profile. Select Auto-detect to assess this computer.")