//go:build windows

// Package collector 实现 Windows 系统静态信息采集。 // Logan.Li
package collector

import (
	"os/exec"
	"strings"
)

type SystemInfo struct {
	OSVersion     string
	Kernel        string
	UptimeSeconds int64
}

func CollectSystem() SystemInfo {
	return SystemInfo{
		OSVersion:     windowsOSCaption(),
		Kernel:        windowsVersion(),
		UptimeSeconds: windowsUptime(),
	}
}

func windowsOSCaption() string {
	out, err := exec.Command("powershell.exe", "-NoProfile", "-Command", "(Get-CimInstance Win32_OperatingSystem).Caption").Output()
	if err != nil {
		return "Windows"
	}
	if s := strings.TrimSpace(string(out)); s != "" {
		return s
	}
	return "Windows"
}

func windowsVersion() string {
	out, err := exec.Command("cmd.exe", "/C", "ver").Output()
	if err != nil {
		return ""
	}
	return strings.TrimSpace(string(out))
}

func windowsUptime() int64 {
	out, err := exec.Command("powershell.exe", "-NoProfile", "-Command", "[int]((Get-Date) - (Get-CimInstance Win32_OperatingSystem).LastBootUpTime).TotalSeconds").Output()
	if err != nil {
		return 0
	}
	var n int64
	for _, ch := range strings.TrimSpace(string(out)) {
		if ch >= '0' && ch <= '9' {
			n = n*10 + int64(ch-'0')
		}
	}
	return n
}