$7zipPath = "$env:ProgramFiles\7-Zip\7z.exe"

# Check if 7-Zip is installed
if (!(Test-Path "$env:ProgramFiles\7-Zip\7z.exe")) {
    Write-Host "7-Zip is not installed. Please install it to use this script."
    exit 1
}

$BackupSource = @(
    "$env:USERPROFILE\Documents",
    "$env:USERPROFILE\Desktop",
    "$env:USERPROFILE\Pictures"
)

$NASDestination = "\\OMV\Backup\$env:COMPUTERNAME"
$TempDir = "$env:TEMP\BackupTemp"
$Date = Get-Date -Format "yyyy-MM-dd"

# Create temp directory
New-Item -ItemType Directory -Path $TempDir -Force

# Create NAS destination if it doesn't exist
if (!(Test-Path $NASDestination)) {
    New-Item -ItemType Directory -Path $NASDestination -Force
}

foreach ($Folder in $BackupSource) {
    if (Test-Path $Folder) {
        $FolderName = Split-Path $Folder -Leaf
        $ZipFile = "$TempDir\$FolderName-$Date.zip"
        
        Write-Host "Compressing $Folder..."
        & "$7zipPath" a -tzip "$ZipFile" "$Folder\*" -mx=9

        Write-Host "Copying $ZipFile to NAS..."
        Copy-Item $ZipFile $NASDestination -Force
        
        Write-Host "Removing $ZipFile..."
        Remove-Item $ZipFile
    }
}

Write-Host "Removing Files older than 15 days from $NASDestination..."
$OldFiles = Get-ChildItem -Path $NASDestination -File | Where-Object { $_.LastWriteTime -lt (Get-Date).AddDays(-15) }
foreach ($OldFile in $OldFiles) {
    Remove-Item $OldFile.FullName -Force
    Write-Host "Removed: $($OldFile.FullName)"
}

# Cleanup
Remove-Item $TempDir -Recurse -Force
Write-Host "Backup completed!"