$ErrorActionPreference = 'Stop'
$baseUrl = 'https://1.1519384.xyz'
if (-not ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) {
    Start-Process powershell.exe -Verb RunAs -ArgumentList ('-NoProfile -Command "irm ' + $baseUrl + ' | iex"')
    return
}
[Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12
$steamPath = (Get-ItemProperty 'HKCU:\Software\Valve\Steam' -ErrorAction SilentlyContinue).SteamPath
if (-not $steamPath) { $steamPath = (Get-ItemProperty 'HKLM:\SOFTWARE\WOW6432Node\Valve\Steam' -ErrorAction SilentlyContinue).InstallPath }
if (-not $steamPath -or -not (Test-Path -LiteralPath (Join-Path $steamPath 'steam.exe'))) { throw 'Steam installation was not found. Start Steam once and try again.' }
$steamPath = [IO.Path]::GetFullPath($steamPath).TrimEnd([char[]]@('\','/'))
$temporary = Join-Path $steamPath ('.vps-install-' + [Guid]::NewGuid().ToString('N'))
New-Item -ItemType Directory -Path $temporary | Out-Null
try {
    Write-Host 'Downloading client package...'
    $manifest = Invoke-RestMethod -Uri ($baseUrl + '/install.json')
    if ($manifest.sha256 -notmatch '^[a-f0-9]{64}$' -or $manifest.download -ne '/client.zip' -or $manifest.size -gt 52428800) { throw 'Invalid package metadata.' }
    $archivePath = Join-Path $temporary 'client.zip'
    Invoke-WebRequest -UseBasicParsing -Uri ($baseUrl + '/client.zip') -OutFile $archivePath
    if ((Get-Item -LiteralPath $archivePath).Length -ne $manifest.size) { throw 'Package size check failed.' }
    $hash = (Get-FileHash -LiteralPath $archivePath -Algorithm SHA256).Hash.ToLowerInvariant()
    if ($hash -ne $manifest.sha256) { throw 'Package checksum check failed.' }
    $rsa = New-Object Security.Cryptography.RSACryptoServiceProvider
    try {
        $rsa.FromXmlString('<RSAKeyValue><Modulus>v82zBBuHd53jNmQ0iK6gk21BkL0ScstsqZ9sWF8NjccPeTUArcmSfJStbShUGPt214OTlaLXpUlaDP/FINXkuhGe27CjTEnEGBZQZgM0/ebM3Q5hPQo+rRv1/PRtxw950HFr8e4wBBR72mEdY7rN4vuhuIla5nA8A6sDMhRiwQTsRSBu+CZ5OGDGpwY3mPhT3Kxoradiqr45QQXde8f4bHMa6EesFbzWcHthGp+efFyGb9ov7l4/vV3xQoztpBSEozmL9ibEqqny11FwL6EEmxsROvDIi84ThiooydIBZPgaszM5vO3pu5ON0yToW8Fo9V7yqo2xsjlUnRUHnUrpWw==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>')
        $signedData = [Text.Encoding]::UTF8.GetBytes($hash + "`n" + [string]$manifest.size)
        if (-not $rsa.VerifyData($signedData, 'SHA256', [Convert]::FromBase64String($manifest.signature))) { throw 'Package signature check failed.' }
    } finally { $rsa.Dispose() }
    Add-Type -AssemblyName System.IO.Compression.FileSystem
    $destination = Join-Path $temporary 'files'
    New-Item -ItemType Directory -Path $destination | Out-Null
    $archive = [IO.Compression.ZipFile]::OpenRead($archivePath)
    try {
        $total = [long]0
        if ($archive.Entries.Count -gt 4096) { throw 'Too many files in package.' }
        foreach ($entry in $archive.Entries) {
            $total += $entry.Length
            $target = [IO.Path]::GetFullPath((Join-Path $destination $entry.FullName))
            if (-not $target.StartsWith($destination + [IO.Path]::DirectorySeparatorChar, [StringComparison]::OrdinalIgnoreCase) -or $total -gt 314572800) { throw 'Unsafe archive path or size.' }
        }
    } finally { $archive.Dispose() }
    [IO.Compression.ZipFile]::ExtractToDirectory($archivePath, $destination)
    $children = @(Get-ChildItem -LiteralPath $destination -Force)
    if ($children.Count -eq 1 -and $children[0].PSIsContainer) { $destination = $children[0].FullName }
    if (Get-Process steam -ErrorAction SilentlyContinue) {
        Write-Host 'Closing Steam before installing...'
        Start-Process -FilePath (Join-Path $steamPath 'steam.exe') -ArgumentList '-shutdown'
        for ($attempt = 0; $attempt -lt 30; $attempt++) {
            if (-not (Get-Process steam -ErrorAction SilentlyContinue)) { break }
            Start-Sleep -Seconds 1
        }
        if (Get-Process steam -ErrorAction SilentlyContinue) { throw 'Please close Steam and run the command again.' }
    }
    Get-ChildItem -LiteralPath $destination -Force | Copy-Item -Destination $steamPath -Recurse -Force
    Write-Host 'Client package installed. Starting Steam...'
    Start-Process -FilePath (Join-Path $steamPath 'steam.exe')
} finally {
    if ($temporary.StartsWith($steamPath + [IO.Path]::DirectorySeparatorChar, [StringComparison]::OrdinalIgnoreCase)) { Remove-Item -LiteralPath $temporary -Recurse -Force -ErrorAction SilentlyContinue }
}