# Downloads and unpacks the WinSCP automation package engine.ps1 needs.
# Called by setup.bat. Safe to re-run.

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

$url  = "https://winscp.net/download/WinSCP-6.3.6-Automation.zip"
$zip  = Join-Path $env:TEMP "winscp.zip"
$dest = Join-Path $PSScriptRoot "WinSCP"

if (Test-Path $zip) { Remove-Item $zip -Force }

Write-Host "Downloading WinSCP from $url ..."
try {
    # winscp.net serves a human "please wait" landing page instead of the real
    # file unless the User-Agent looks like a known download tool (curl/wget) -
    # PowerShell's own default UA gets the landing page every time.
    Invoke-WebRequest -Uri $url -OutFile $zip -UseBasicParsing -UserAgent "curl/8.0.1"
} catch {
    Write-Host "ERROR: Download failed - $($_.Exception.Message)" -ForegroundColor Red
    Write-Host "Check your internet connection, or ask IT if winscp.net / sourceforge.net are blocked." -ForegroundColor Yellow
    exit 1
}

$fileInfo = Get-Item $zip
if ($fileInfo.Length -lt 1MB) {
    Write-Host "ERROR: Downloaded file is only $($fileInfo.Length) bytes - too small to be WinSCP." -ForegroundColor Red
    Write-Host "This is usually winscp.net serving its 'please wait' landing page instead of the real file, or antivirus/a firewall intercepting the download." -ForegroundColor Yellow

    $preview = Get-Content -Path $zip -TotalCount 15 -ErrorAction SilentlyContinue
    if ($preview) {
        Write-Host ""
        Write-Host "--- What was actually downloaded (first 15 lines, for troubleshooting) ---" -ForegroundColor Yellow
        $preview | ForEach-Object { Write-Host $_ }
        Write-Host "--- end ---" -ForegroundColor Yellow
        Write-Host ""
    }

    Write-Host "Try running setup.bat again. If it keeps happening, ask IT whether winscp.net / sourceforge.net downloads are being blocked, or download WinSCP-6.3.6-Automation.zip manually in a browser and unzip it into:" -ForegroundColor Yellow
    Write-Host "  $dest" -ForegroundColor Yellow
    Remove-Item $zip -Force
    exit 1
}

try {
    Expand-Archive -Path $zip -DestinationPath $dest -Force
} catch {
    Write-Host "ERROR: Could not unzip the download - $($_.Exception.Message)" -ForegroundColor Red
    Write-Host "The downloaded file was likely corrupted or cut short in transit. Try running setup.bat again." -ForegroundColor Yellow
    Write-Host "Left the bad file at $zip in case you want to look at it." -ForegroundColor Yellow
    exit 1
}

Remove-Item $zip -Force
Write-Host "WinSCP ready." -ForegroundColor Green