package util

import (
	"strings"
)

// ParseUserAgent 解析User-Agent字符串，返回操作系统信息
func ParseUserAgent(userAgent string) string {
	if userAgent == "" {
		return "未知"
	}

	userAgent = strings.ToLower(userAgent)

	// 操作系统判断
	switch {
	case strings.Contains(userAgent, "windows"):
		return "Windows"
	case strings.Contains(userAgent, "macintosh") || strings.Contains(userAgent, "mac os x"):
		return "MacOS"
	case strings.Contains(userAgent, "linux"):
		return "Linux"
	case strings.Contains(userAgent, "android"):
		return "Android"
	case strings.Contains(userAgent, "iphone") || strings.Contains(userAgent, "ipad") || strings.Contains(userAgent, "ipod"):
		return "iOS"
	case strings.Contains(userAgent, "freebsd"):
		return "FreeBSD"
	case strings.Contains(userAgent, "openbsd"):
		return "OpenBSD"
	case strings.Contains(userAgent, "netbsd"):
		return "NetBSD"
	case strings.Contains(userAgent, "sunos"):
		return "Solaris"
	default:
		return "未知"
	}
}