import ipaddress
import re


def parse_ip_list(text: str) -> list[str]:
    """Parse unique IPv4 addresses from free-form text."""
    normalized = re.sub(r'[,;|\t]+', '\n', text or '')
    lines = normalized.strip().split('\n')

    ips: list[str] = []
    for line in lines:
        ips.extend(re.findall(r'\b(?:[0-9]{1,3}\.){3}[0-9]{1,3}\b', line))

    valid_ips: list[str] = []
    for ip in ips:
        try:
            ipaddress.IPv4Address(ip)
            valid_ips.append(ip)
        except Exception:
            pass

    return sorted(set(valid_ips), key=valid_ips.index)


def extract_field(line: str) -> str:
    return line.split(':', 1)[1].strip() if ':' in line else ''


def parse_whois(whois_output: str) -> dict[str, str]:
    """Extract relevant information from WHOIS output, including user/customer labels."""
    info = {
        'org': 'Unknown',
        'user': 'Unknown',
        'country': 'Unknown',
        'netname': 'Unknown',
        'asn': 'Unknown',
        'cidr': 'Unknown',
    }

    for raw_line in whois_output.split('\n'):
        line = raw_line.strip()
        lowered = line.lower()

        if line.startswith('Organization:') or line.startswith('org-name:') or line.startswith('OrgName:'):
            value = extract_field(line)
            if value:
                info['org'] = value
        elif line.startswith('Country:') or line.startswith('country:'):
            value = extract_field(line)
            if value:
                info['country'] = value
        elif line.startswith('NetName:') or line.startswith('netname:'):
            value = extract_field(line)
            if value:
                info['netname'] = value
        elif line.startswith('CIDR:') or line.startswith('inetnum:') or line.startswith('route:'):
            value = extract_field(line)
            if value:
                info['cidr'] = value
        elif line.startswith('OriginAS:') or line.startswith('origin:') or line.startswith('originas:'):
            asn = re.search(r'AS\d+', line, re.IGNORECASE)
            if asn:
                info['asn'] = asn.group().upper()
        elif re.match(r'^(user|customer|owner|descr):', lowered):
            value = extract_field(line)
            if value and info['user'] == 'Unknown':
                info['user'] = value

    return info