# common/os_utils.py
import platform
import os
from functools import lru_cache

@lru_cache(maxsize=1)
def get_os_info():
    """
    Detect Linux distribution and return (fontawesome_class, display_name).
    Falls back to generic Linux.
    """
    system = platform.system()
    if system != 'Linux':
        return ('fa-brands fa-linux', system)

    # Try to read /etc/os-release
    os_release_path = '/etc/os-release'
    distro_id = ''
    distro_name = ''
    try:
        with open(os_release_path, 'r') as f:
            for line in f:
                if line.startswith('ID='):
                    distro_id = line.split('=', 1)[1].strip().strip('"').lower()
                elif line.startswith('NAME='):
                    distro_name = line.split('=', 1)[1].strip().strip('"')
    except Exception:
        pass

    # Map IDs to FontAwesome icons and display names
    mapping = {
        'debian': ('fa-brands fa-debian', 'Debian'),
        'ubuntu': ('fa-brands fa-ubuntu', 'Ubuntu'),
        'fedora': ('fa-brands fa-fedora', 'Fedora'),
        'rhel': ('fa-brands fa-redhat', 'RHEL'),
        'centos': ('fa-brands fa-centos', 'CentOS'),
        'opensuse': ('fa-brands fa-suse', 'openSUSE'),
        'suse': ('fa-brands fa-suse', 'SUSE'),
    }

    if distro_id in mapping:
        return mapping[distro_id]

    return ('fa-brands fa-linux', distro_name or 'Linux')