# Calculate Patch Tuesday
$PatchTuesday = Get-Date -Day 8
while ($PatchTuesday.DayOfWeek -ne 'Tuesday') {
    $PatchTuesday = $PatchTuesday.AddDays(1)
}

$osVersionShortName = @{
"26100" = "24H2"
"22631" = "23H2"
"22621" = "22H2"
"19045" = "22H2"
"19044" = "21H2"
}

<#    # This was from reading information from a wim
$WindowsType = $wimImageInfo.ImageDescription.Substring(8,2)
$windowsVersion = $osVersionShortName[$wimImageInfo.Build]
$windowsArch = if ($wimImageInfo.Architecture -eq 9) { "x64" } else { "x86" }
#>
$hostInfo = (Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion") | Select-Object -Property *
$windowsType = $hostInfo.CurrentMajorVersionNumber
$windowsVersion = $osVersionShortName[$hostInfo.CurrentBuild]  # You could also use DisplayVerison here
$windowsArch = if ([Environment]::Is64BitOperatingSystem) { "x64" } else { "x86" }

# Are we before or after patch tuesday
If ((Get-Date) -lt $PatchTuesday)
{
    If ($PatchTuesday.Month -ne "1")
    {
        $search = "{0:d4}-{1:d2} Cumulative Update for Windows {2} Version {3} for {4}" -f $PatchTuesday.Year, $PatchTuesday.AddMonths(-1).Month, $WindowsType, $windowsVersion, $windowsArch
    }
    else
    {
        $search = "{0:d4}-{1:d2} Cumulative Update for Windows {2} Version {3} for {4}" -f $PatchTuesday.AddYears(-1).Year, $PatchTuesday.AddMonths(-1).Month, $WindowsType, $windowsVersion, $windowsArch

    }
}
else
{
    $search = "{0:d4}-{1:d2} Cumulative Update for Windows {2} Version {3} for {4}" -f $PatchTuesday.Year, $PatchTuesday.Month, $WindowsType, $windowsVersion, $windowsArch
}

# MS Update Catalog search url
$catalog = "https://www.catalog.update.microsoft.com/Search.aspx?q="

# We can search for .net updates later
# In the format 2025-03 Cumulative Update for Microsoft .NET Framework Windows 11 version 24H2 x64

# Completed search string
$search = $catalog + '"' + $search + '"'

# Capture the download page so we can get the update GUID
$results = Invoke-WebRequest -Uri $search -UseBasicParsing

# Gets the guid of the update
$kbids = $results.InputFields | Where-Object { $_.type -eq 'Button' -and $_.Value -eq 'Download' } | Select-Object -ExpandProperty  ID
$guids = $results.Links | Where-Object ID -match '_link' | Where-Object { $_.OuterHTML -match ( "(?=.*" + ( $Filter -join ")(?=.*" ) + ")" ) } | ForEach-Object { $_.id.replace('_link', '') } | Where-Object { $_ -in $kbids }


# Send the guid information as a request to the download page
$post = @{ size = 0; languages = ""; uidInfo = $guids; updateID = $guids } | ConvertTo-Json -Compress
$body = @{ updateIDs = "[$post]" }
$catDLPage = Invoke-WebRequest -Uri 'https://www.catalog.update.microsoft.com/DownloadDialog.aspx' -Method Post -Body $body -UseBasicParsing

If ($catDLPage.StatusCode -eq "200") {
    # We read the raw html, which sucks ass
    $htmlParse = ($catDLPage | Select-Object -ExpandProperty Content) -split "[`r`n]"

    # Find the line with the adctual download link
    $junk = $htmlParse | Select-String "https://catalog.sf.dl.delivery.mp.microsoft.com"

    If ($junk -eq $null) {
        Write-Warning "Unable to find download URL https://catalog.sf.dl.delivery.mp.microsoft.com"
    }

    foreach ($item in $junk) {
        # Get the download link from the parsed lines
        $link = $item.Line.Substring($item.Matches.Index, ($item.Line.Length - $item.Matches.Index - 2))
        $filename = $link.Substring($link.IndexOf("windows" + $WindowsType))

        # Download the file
        if ($link -match "kb5043080") {
            # Hacky garbage, this keeps showing up since september but the KB is a patch from 2024-09
        } else {

            Invoke-WebRequest -Uri $link -OutFile ("$PSScriptRoot\$filename")
        }
    }
}