<#  Sync-VipClouds.ps1
    Mirrors \\server\share to C:\vipclouds at user logon.
    Creates logs in %ProgramData%\vip_sync\logs\YYYYMMDD.txt
#>

#region Config
$Source      = '\\mios-app22\DomainResources\vip_sync'   # <-- change if needed
$Destination = 'C:\vipclouds'
$DoMirror    = $true   # $true = /MIR (delete extras in dest). $false = /E (no deletions)
$Excludes    = @('*.tmp','*.bak','.DS_Store','Thumbs.db') # optional patterns
$MaxRetries  = 12      # ~2 minutes total with default wait
$WaitSeconds = 10
#endregion

#region Prep + Logging
$LogRoot = Join-Path $env:ProgramData 'vip_sync\logs'
$null = New-Item -ItemType Directory -Path $LogRoot -Force -ErrorAction SilentlyContinue
$LogFile = Join-Path $LogRoot "$(Get-Date -Format 'yyyyMMdd').txt"

Function Write-Log($msg) {
    $line = "[{0}] {1}" -f (Get-Date -Format 'HH:mm:ss'), $msg
    Add-Content -Path $LogFile -Value $line
}

Write-Log "==== Logon sync start. User=$env:USERNAME  Computer=$env:COMPUTERNAME ===="
Write-Log "Source=$Source  Dest=$Destination  Mirror=$DoMirror"
#endregion

#region Reachability + Dest ensure
# Wait for network + share reachability
$attempt = 0
while ($attempt -lt $MaxRetries) {
    if (Test-Path $Source) { break }
    $attempt++
    Write-Log "Source not reachable (attempt $attempt/$MaxRetries). Sleeping ${WaitSeconds}s…"
    Start-Sleep -Seconds $WaitSeconds
}
if (-not (Test-Path $Source)) {
    Write-Log "ABORT: Source still unreachable after retries."
    exit 0  # don't block logon
}

# Ensure destination exists
if (-not (Test-Path $Destination)) {
    try {
        New-Item -ItemType Directory -Path $Destination -Force | Out-Null
        Write-Log "Created destination folder: $Destination"
    } catch {
        Write-Log "ABORT: Failed to create $Destination : $($_.Exception.Message)"
        exit 0
    }
}
#endregion

#region Build robocopy args
$modeSwitches = if ($DoMirror) { '/MIR' } else { '/E' }
# /Z = restartable, /FFT = tolerate FAT time granularity, /R:2 /W:5 = quick retries,
# /XO = skip older, /COPY:DAT = data+attrs+timestamps, /DCOPY:DAT = dir metadata
$common = @(
    $Source, $Destination,
    $modeSwitches, '/Z', '/FFT', '/R:2', '/W:5', '/COPY:DAT', '/DCOPY:DAT', '/NP', '/NFL', '/NDL'
)

# Exclusions
$excludeArgs = @()
if ($Excludes.Count -gt 0) { $excludeArgs += @('/XF'); $excludeArgs += $Excludes }

# Log to file as well
$logArg = @('/LOG+:' + $LogFile)

$robocopyArgs = $common + $excludeArgs + $logArg
#endregion

#region Run robocopy
Write-Log "Running: robocopy $($robocopyArgs -join ' ')"
$start = Get-Date
$rc = (Start-Process -FilePath 'robocopy.exe' -ArgumentList $robocopyArgs -Wait -PassThru).ExitCode
$elapsed = (Get-Date) - $start
Write-Log "Robocopy exit code: $rc  Elapsed: {0:mm\:ss}" -f $elapsed

# Robocopy success codes: 0,1,2,3,5,6,7
if ($rc -in 0,1,2,3,5,6,7) {
    Write-Log "Sync OK."
    exit 0
} else {
    Write-Log "Sync FAILED with code $rc. See robocopy docs for code meaning."
    exit 0  # still don’t block logon
}
#endregion