# Define the drive or folder to scan
$rootPath = "C:\" # Adjust to your target drive or folder

# Define the base path for output CSV files
$baseOutputCsv = "C:\temp\fileDetails" # Base path and name for output files

# Initialize the file counter and line counter
$fileCounter = 1
$lineCounter = 0
$linesPerFile = 5000 # Define how many lines you want per file

function New-OutputCsv {
    param (
        [string]$basePath,
        [ref]$counter
    )

    $fileName = "${basePath}_$($counter.Value).csv"
    "Path,Size (KB),LastAccessTime,LastWriteTime,CreationTime,Permissions" | Out-File $fileName
    $counter.Value++
    $global:lineCounter = 0 # Reset line counter for the new file
    return $fileName
}

function Add-Line {
    param (
        [string]$line,
        [string]$outputCsv
    )

    Add-Content -Path $outputCsv -Value $line
    $global:lineCounter++

    # Check if we need to split into a new file based on line count
    if ($global:lineCounter -ge $global:linesPerFile) {
        $global:outputCsv = New-OutputCsv -basePath $baseOutputCsv -counter ([ref]$fileCounter)
    }
}

function Get-PermissionsSummary {
    param (
        [System.Security.AccessControl.FileSystemSecurity]$Acl
    )
    $permissions = @()
    foreach ($access in $Acl.Access) {
        # Correct usage of variable inside a string
        $identity = $access.IdentityReference.Value
        $rights = $access.FileSystemRights
        $accessType = $access.AccessControlType
        $permissions += "${identity}: $rights ($accessType)"
    }
    return $permissions -join "; "
}


function Safe-EnumerateFiles {
    param (
        [System.IO.DirectoryInfo]$Directory
    )

    # Handle directories
    try {
        $Directory.EnumerateDirectories() | ForEach-Object {
            Safe-EnumerateFiles -Directory $_
        }
    } catch [System.UnauthorizedAccessException] {
        Write-Host "Access denied: $($_.Exception.Message)"
    }

    # Handle files
    try {
        $Directory.EnumerateFiles() | ForEach-Object {
            $file = $_
            $sizeInKb = "{0:N2}" -f ($file.Length / 1KB)
            try {
                $acl = Get-Acl -LiteralPath $file.FullName
                $permissions = Get-PermissionsSummary -Acl $acl
            } catch {
                $permissions = "Failed to retrieve permissions"
            }
            $line = "$($file.FullName),$sizeInKb,$($file.LastAccessTime),$($file.LastWriteTime),$($file.CreationTime),`"$permissions`""

            Add-Line -line $line -outputCsv $global:outputCsv
        }
    } catch [System.UnauthorizedAccessException] {
        Write-Host "Access denied: $($_.Exception.Message)"
    }
}

# Create the first output CSV file
$outputCsv = New-OutputCsv -basePath $baseOutputCsv -counter ([ref]$fileCounter)

# Start the enumeration
Safe-EnumerateFiles -Directory (New-Object System.IO.DirectoryInfo $rootPath)

Write-Host "File details export completed. Files start with $baseOutputCsv`_1.csv"