param(
    [Parameter(Mandatory=$true)]
    [ValidateSet("battery","time","cpu","ram","disk","all")]
    [string]$Topic
)

$ErrorActionPreference = 'SilentlyContinue'

function Get-BatteryInfo {
    $b = Get-CimInstance -ClassName Win32_Battery
    if (-not $b) { return "Батарея не обнаружена (видимо, десктоп)" }
    $pct = [int]$b.EstimatedChargeRemaining
    $status = switch ($b.BatteryStatus) {
        1 { "разряжается" }
        2 { "от сети" }
        3 { "заряжена" }
        4 { "низкий заряд" }
        5 { "критический заряд" }
        default { "статус $($b.BatteryStatus)" }
    }
    return "Батарея: $pct%, $status"
}

function Get-TimeInfo {
    $ru = [System.Globalization.CultureInfo]::GetCultureInfo("ru-RU")
    $now = Get-Date
    return "Сейчас: " + $now.ToString("HH:mm, dd MMMM, dddd", $ru)
}

function Get-CpuInfo {
    $cpu = Get-CimInstance -ClassName Win32_Processor | Select-Object -First 1
    $load = (Get-CimInstance -ClassName Win32_PerfFormattedData_PerfOS_Processor -Filter "Name='_Total'" -ErrorAction SilentlyContinue).PercentProcessorTime
    if ($null -eq $load) { $load = $cpu.LoadPercentage }
    return "CPU: $($cpu.Name.Trim()), загрузка $load%"
}

function Get-RamInfo {
    $os = Get-CimInstance -ClassName Win32_OperatingSystem
    $totalGB = [math]::Round($os.TotalVisibleMemorySize / 1MB, 1)
    $freeGB = [math]::Round($os.FreePhysicalMemory / 1MB, 1)
    $usedGB = [math]::Round($totalGB - $freeGB, 1)
    $pct = [int](($usedGB / $totalGB) * 100)
    return "RAM: $usedGB из $totalGB ГБ ($pct% занято)"
}

function Get-DiskInfo {
    $sys = Get-CimInstance -ClassName Win32_LogicalDisk -Filter "DeviceID='$($env:SystemDrive)'"
    if (-not $sys) {
        $sys = Get-CimInstance -ClassName Win32_LogicalDisk -Filter "DriveType=3" | Select-Object -First 1
    }
    $freeGB = [math]::Round($sys.FreeSpace / 1GB, 1)
    $totalGB = [math]::Round($sys.Size / 1GB, 1)
    return "Диск $($sys.DeviceID): свободно $freeGB из $totalGB ГБ"
}

switch ($Topic) {
    "battery" { Get-BatteryInfo }
    "time"    { Get-TimeInfo }
    "cpu"     { Get-CpuInfo }
    "ram"     { Get-RamInfo }
    "disk"    { Get-DiskInfo }
    "all" {
        Get-TimeInfo
        Get-BatteryInfo
        Get-CpuInfo
        Get-RamInfo
        Get-DiskInfo
    }
}