package common

import "net"

func IsIP(s string) bool {
	ip := net.ParseIP(s)
	return ip != nil
}

func ParseIP(s string) net.IP {
	return net.ParseIP(s)
}

func IsPrivateIP(ip net.IP) bool {
	if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() {
		return true
	}

	private := []net.IPNet{
		{IP: net.IPv4(10, 0, 0, 0), Mask: net.CIDRMask(8, 32)},
		{IP: net.IPv4(172, 16, 0, 0), Mask: net.CIDRMask(12, 32)},
		{IP: net.IPv4(192, 168, 0, 0), Mask: net.CIDRMask(16, 32)},
	}

	for _, privateNet := range private {
		if privateNet.Contains(ip) {
			return true
		}
	}
	return false
}

func IsIpInCIDRList(ip net.IP, cidrList []string) bool {
	for _, cidr := range cidrList {
		_, network, err := net.ParseCIDR(cidr)
		if err != nil {
			// 尝试作为单个IP处理
			if whitelistIP := net.ParseIP(cidr); whitelistIP != nil {
				if ip.Equal(whitelistIP) {
					return true
				}
			}
			continue
		}

		if network.Contains(ip) {
			return true
		}
	}
	return false
}