<#
.SYNOPSIS
    Inregistreaza local, in CSV, curba de descarcare a UPS-ului in timpul unui test
    de autonomie cu scoaterea din priza.

.DESCRIPTION
    Se ruleaza ca task programat, sub SYSTEM, ca sa supravietuiasca inchiderii
    sesiunii SSH - exact scenariul unui test de pana, unde reteaua poate cadea odata
    cu curentul daca switch-ul nu e pe UPS.

    Scrie o linie la fiecare interval, indiferent de starea alimentarii, si se
    opreste singur dupa MaxOre sau cand apare fisierul STOP-TRACE langa CSV.
    Fisierul CSV e singura sursa sigura de date daca reteaua pica: monitorul
    propriu-zis noteaza doar evenimentele, nu fiecare citire.

    Se porneste cu start-trace.ps1, care inregistreaza si taskul.

.EXAMPLE
    powershell -ExecutionPolicy Bypass -File .\trace-baterie.ps1 -IntervalSecunde 20
#>
[CmdletBinding()]
param(
    [string]$OutFile = 'C:\ROMFAST\ups-monitor\log\trace-baterie.csv',
    [ValidateRange(5, 300)][int]$IntervalSecunde = 20,
    [ValidateRange(1, 24)][int]$MaxOre = 8
)

Set-StrictMode -Version 2.0
$ErrorActionPreference = 'Stop'

if (-not ('TracePowerStatus' -as [type])) {
    Add-Type -TypeDefinition @'
using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential)]
public struct TRACE_POWER_STATUS {
    public byte ACLineStatus;
    public byte BatteryFlag;
    public byte BatteryLifePercent;
    public byte SystemStatusFlag;
    public int  BatteryLifeTime;
    public int  BatteryFullLifeTime;
}

public static class TracePowerStatus {
    [DllImport("kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool GetSystemPowerStatus(out TRACE_POWER_STATUS status);
}
'@
}

$dir = Split-Path -Parent $OutFile
if (-not (Test-Path -LiteralPath $dir)) { New-Item -ItemType Directory -Path $dir -Force | Out-Null }

$stopFile = Join-Path $dir 'STOP-TRACE'
Remove-Item -LiteralPath $stopFile -Force -ErrorAction SilentlyContinue

if (-not (Test-Path -LiteralPath $OutFile)) {
    Set-Content -LiteralPath $OutFile -Encoding UTF8 `
        -Value 'ora;sursa;procent;autonomie_sec;acLineStatus;batteryFlag'
}
Add-Content -LiteralPath $OutFile -Encoding UTF8 `
    -Value ('# start {0}' -f (Get-Date -Format 'yyyy-MM-dd HH:mm:ss'))

$pana = (Get-Date).AddHours($MaxOre)

while ((Get-Date) -lt $pana -and -not (Test-Path -LiteralPath $stopFile)) {
    try {
        $st = New-Object TRACE_POWER_STATUS
        [void][TracePowerStatus]::GetSystemPowerStatus([ref]$st)

        $sursa = switch ($st.ACLineStatus) {
            0 { 'baterie' }
            1 { 'retea' }
            default { 'necunoscut' }
        }
        $procent = if ($st.BatteryLifePercent -le 100) { [int]$st.BatteryLifePercent } else { '' }
        $autonomie = if ($st.BatteryLifeTime -ge 0) { [int]$st.BatteryLifeTime } else { '' }

        Add-Content -LiteralPath $OutFile -Encoding UTF8 -Value (
            '{0};{1};{2};{3};{4};{5}' -f (Get-Date -Format 'HH:mm:ss'), $sursa, $procent,
            $autonomie, [int]$st.ACLineStatus, [int]$st.BatteryFlag)
    } catch {
        Add-Content -LiteralPath $OutFile -Encoding UTF8 -Value (
            '{0};EROARE;;;;{1}' -f (Get-Date -Format 'HH:mm:ss'), $_.Exception.Message)
    }
    Start-Sleep -Seconds $IntervalSecunde
}

Add-Content -LiteralPath $OutFile -Encoding UTF8 `
    -Value ('# stop {0}' -f (Get-Date -Format 'yyyy-MM-dd HH:mm:ss'))