# Mirror Datto Quality Department to SharePoint via OneDrive sync
# Uses robocopy /MIR to make destination EXACTLY match source
# Deletes files in SharePoint that don't exist in Datto

param(
    [switch]$Confirm,
    [switch]$DryRun
)

$ErrorActionPreference = 'Stop'

$DattoSource = "C:\Users\Public\Desktop\Datto Workplace Server Projects\Quality Department"
$SharePointDest = "C:\Users\Administrator\OneDrive - Birth Biologic, LLC\Quality Systems Department\Documents"

Write-Host "[INFO] Starting mirror from Datto to SharePoint via OneDrive sync..."
Write-Host "[INFO] Source (Datto): $DattoSource"
Write-Host "[INFO] Destination (SharePoint/OneDrive): $SharePointDest"
Write-Host ""

# Verify paths exist
if (-not (Test-Path $DattoSource)) {
    throw "Source path does not exist: $DattoSource"
}

if (-not (Test-Path $SharePointDest)) {
    throw "Destination path does not exist: $SharePointDest"
}

# Get file counts before
$beforeCount = (Get-ChildItem $SharePointDest -Recurse -File -ErrorAction SilentlyContinue | Measure-Object).Count
Write-Host "[INFO] Files in SharePoint before: $beforeCount"
Write-Host ""

# Show what robocopy will do (dry run)
Write-Host "[DRY RUN] Simulating robocopy /MIR (mirror)..."
Write-Host ""

$dryRunLog = "C:\temp\robocopy-quality-dryrun.log"
New-Item -Path "C:\temp" -ItemType Directory -Force | Out-Null

robocopy $DattoSource $SharePointDest /MIR /L /NP /NDL /NFL /LOG:$dryRunLog /R:0 /W:0

# Parse dry run log to show what will be deleted
$logContent = Get-Content $dryRunLog -Raw
if ($logContent -match '\*EXTRA File\s+(.+)') {
    Write-Host "[WARNING] Files that will be DELETED from SharePoint (not in Datto):"
    Write-Host ""
    Get-Content $dryRunLog | Where-Object { $_ -match '\*EXTRA File' } | ForEach-Object {
        if ($_ -match '\*EXTRA File\s+\d+\s+(.+)') {
            Write-Host "  - $($Matches[1])"
        }
    }
    Write-Host ""
}

# Count files to be deleted
$extraFiles = (Get-Content $dryRunLog | Where-Object { $_ -match '\*EXTRA File' }).Count
Write-Host "[INFO] $extraFiles file(s) will be deleted"
Write-Host ""

# Exit after dry run if -DryRun specified
if ($DryRun) {
    Write-Host "[DRY RUN ONLY] Use -Confirm to execute actual mirror"
    exit 0
}

# Confirm before proceeding
if (-not $Confirm) {
    $response = Read-Host "Proceed with ACTUAL mirror? This will DELETE $extraFiles files from SharePoint. Type 'yes' to confirm"

    if ($response -ne 'yes') {
        Write-Host "[CANCELLED] No changes made"
        exit 1
    }
} else {
    Write-Host "[INFO] Running with -Confirm switch, proceeding automatically..."
}

# Execute actual mirror
Write-Host ""
Write-Host "[INFO] Executing robocopy /MIR..."
Write-Host ""

$actualLog = "C:\temp\robocopy-quality-actual.log"

# /MIR = mirror (copy + purge extra files)
# /R:0 = no retries on failed copies
# /W:0 = no wait between retries
# /MT:8 = use 8 threads
# /LOG = write log file
robocopy $DattoSource $SharePointDest /MIR /R:0 /W:0 /MT:8 /LOG:$actualLog /NP

$exitCode = $LASTEXITCODE

# Robocopy exit codes: 0-7 are success/warnings, 8+ are errors
if ($exitCode -ge 8) {
    throw "Robocopy failed with exit code $exitCode - check $actualLog"
}

# Get file counts after
$afterCount = (Get-ChildItem $SharePointDest -Recurse -File -ErrorAction SilentlyContinue | Measure-Object).Count
Write-Host ""
Write-Host "[OK] Mirror complete"
Write-Host "[INFO] Files in SharePoint after: $afterCount (was $beforeCount)"
Write-Host "[INFO] Files deleted: $($beforeCount - $afterCount)"
Write-Host "[INFO] Full log: $actualLog"
Write-Host ""
Write-Host "[INFO] OneDrive will now sync these changes to SharePoint..."
Write-Host ""