#Requires -RunAsAdministrator
<#
.SYNOPSIS
    Phase 2.3: Sync data from Synology NAS to CS-SERVER.
.DESCRIPTION
    Uses robocopy to pull all shared folder data from the Synology NAS
    (192.168.0.120) to D:\Shares on CS-SERVER. Creates missing folders
    and SMB shares. Run on CS-SERVER via ScreenConnect.
.NOTES
    - Synology must be accessible at \\192.168.0.120
    - Run BEFORE phase2-file-shares.ps1 (permissions are set after sync)
    - First run may take hours depending on data size
    - Subsequent runs are incremental (robocopy only copies changes)
    - /MIR is NOT used to avoid accidental deletion — uses /E instead
#>

$NAS = "192.168.0.120"
$DestRoot = "D:\Shares"

Write-Host "=== Phase 2.3: Synology Data Sync ===" -ForegroundColor Cyan
Write-Host ""

# --- Test NAS connectivity ---
Write-Host "--- Testing NAS connectivity ---" -ForegroundColor Yellow

$ping = Test-Connection -ComputerName $NAS -Count 2 -Quiet -ErrorAction SilentlyContinue
if (-not $ping) {
    Write-Host "[FAIL] Cannot reach $NAS — aborting" -ForegroundColor Red
    exit 1
}
Write-Host "  [OK] $NAS is reachable" -ForegroundColor Green

# Test SMB access
try {
    $testPath = Test-Path "\\$NAS\Public" -ErrorAction Stop
    if ($testPath) {
        Write-Host "  [OK] SMB access to \\$NAS works" -ForegroundColor Green
    } else {
        Write-Host "  [WARN] \\$NAS\Public not accessible — may need credentials" -ForegroundColor Yellow
        Write-Host "  Run: net use \\$NAS /user:admin <password>" -ForegroundColor Yellow
    }
}
catch {
    Write-Host "  [WARN] SMB access test failed: $_" -ForegroundColor Yellow
    Write-Host "  You may need to map the NAS first:" -ForegroundColor Yellow
    Write-Host "  net use \\$NAS /user:admin <password>" -ForegroundColor Yellow
}

# --- Define sync jobs ---
# Source (Synology share name) -> Destination folder on CS-SERVER
$syncJobs = @(
    @{ Name = "Management";  Source = "\\$NAS\Management";  Dest = "$DestRoot\Management" }
    @{ Name = "SalesDept";   Source = "\\$NAS\SalesDept";   Dest = "$DestRoot\SalesDept" }
    @{ Name = "Server";      Source = "\\$NAS\Server";      Dest = "$DestRoot\Server" }
    @{ Name = "chat";        Source = "\\$NAS\chat";        Dest = "$DestRoot\chat" }
    @{ Name = "Public";      Source = "\\$NAS\Public";      Dest = "$DestRoot\Public" }
    @{ Name = "homes";       Source = "\\$NAS\homes";       Dest = "$DestRoot\homes" }
)

# --- Create destination folders ---
Write-Host "`n--- Creating destination folders ---" -ForegroundColor Yellow

foreach ($job in $syncJobs) {
    if (-not (Test-Path $job.Dest)) {
        New-Item -Path $job.Dest -ItemType Directory -Force | Out-Null
        Write-Host "  [OK] Created $($job.Dest)" -ForegroundColor Green
    } else {
        Write-Host "  [SKIP] $($job.Dest) already exists" -ForegroundColor DarkGray
    }
}

# --- Sync each share ---
Write-Host "`n--- Syncing data (this may take a while) ---" -ForegroundColor Yellow
Write-Host ""

$logDir = "$DestRoot\IT\Backups\SyncLogs"
New-Item -Path $logDir -ItemType Directory -Force | Out-Null

foreach ($job in $syncJobs) {
    Write-Host "=== Syncing: $($job.Name) ===" -ForegroundColor Cyan
    Write-Host "  From: $($job.Source)" -ForegroundColor DarkGray
    Write-Host "  To:   $($job.Dest)" -ForegroundColor DarkGray

    # Check if source is accessible
    if (-not (Test-Path $job.Source)) {
        Write-Host "  [SKIP] Source not accessible: $($job.Source)" -ForegroundColor Yellow
        continue
    }

    $logFile = "$logDir\sync-$($job.Name)-$(Get-Date -Format 'yyyy-MM-dd_HHmm').log"

    # Robocopy options:
    #   /E      = copy subdirectories including empty ones
    #   /Z      = restartable mode (resume on network interruption)
    #   /COPY:DAT = copy Data, Attributes, Timestamps (no permissions — we set those separately)
    #   /R:3    = retry 3 times on failure
    #   /W:5    = wait 5 seconds between retries
    #   /MT:8   = 8 threads for parallel copy
    #   /XD     = exclude directories (@ prefixed Synology system dirs)
    #   /LOG    = log to file
    #   /NP     = no progress percentage (cleaner log)
    #   /TEE    = output to console AND log file

    $roboArgs = @(
        $job.Source,
        $job.Dest,
        "/E", "/Z",
        "/COPY:DAT",
        "/R:3", "/W:5",
        "/MT:8",
        "/XD", "@eaDir", "@tmp", "#recycle", "#snapshot",
        "/XF", "Thumbs.db", ".DS_Store", "desktop.ini",
        "/LOG:$logFile",
        "/NP", "/TEE"
    )

    $startTime = Get-Date
    & robocopy @roboArgs
    $exitCode = $LASTEXITCODE
    $elapsed = (Get-Date) - $startTime

    # Robocopy exit codes: 0=no change, 1=files copied, 2=extras, 4=mismatches, 8+=errors
    if ($exitCode -lt 8) {
        Write-Host "  [OK] $($job.Name) synced in $([math]::Round($elapsed.TotalMinutes, 1)) minutes (exit code: $exitCode)" -ForegroundColor Green
    } else {
        Write-Host "  [ERROR] $($job.Name) had errors (exit code: $exitCode) — check $logFile" -ForegroundColor Red
    }
    Write-Host ""
}

# --- Summary ---
Write-Host "=== Sync Complete ===" -ForegroundColor Cyan
Write-Host ""
Write-Host "Folder sizes:" -ForegroundColor Yellow

foreach ($job in $syncJobs) {
    if (Test-Path $job.Dest) {
        $size = (Get-ChildItem $job.Dest -Recurse -File -ErrorAction SilentlyContinue | Measure-Object Length -Sum).Sum
        $sizeGB = [math]::Round($size / 1GB, 2)
        $fileCount = (Get-ChildItem $job.Dest -Recurse -File -ErrorAction SilentlyContinue).Count
        Write-Host "  $($job.Name): $sizeGB GB ($fileCount files)" -ForegroundColor Cyan
    }
}

Write-Host ""
Write-Host "Sync logs saved to: $logDir" -ForegroundColor Green
Write-Host "Next: Run phase2-file-shares.ps1 to set permissions and create SMB shares" -ForegroundColor Green