copy files and rename them by creation time stamp conflict-free

copy_to_timestamp.ps1

[CmdletBinding()]
param (
    [Parameter(Mandatory)]
    [ValidateNotNullOrEmpty()]
    [string]
    $source,
    [Parameter(Mandatory)]
    [ValidateNotNullOrEmpty()]
    [string]
    $destination,
    [string]
    $location,
    [switch]
    $skipDuplicates = $false,
    [switch]
    $overrideTimeWithNow = $false
)

if (!$source) {
    $source = Join-Path $PSScriptRoot "102PANA"
}

if ($location) {
    $location = "_" + $location
}

$files = Get-ChildItem -Path $source
$fileCount = $files.count
$currentIndex = 0
$groups = ($files | Sort-Object -Property Name | Group-Object -Property extension,@{ expression={$_.lastWriteTime}})
for ($i = 0; $i -lt $groups.Count; $i++) {
    $group = $groups[$i].Group
    $count = $groups[$i].Count
    $padLeft = ([Int32]$count).ToString().Count
    for ($j = 0; $j -lt $count; $j++) {
        $file = $group[$j]
        $suffix = if ($count -gt 1) { "_" + ([Int32]$j + 1).ToString().PadLeft($padLeft, '0') } else { "" }
        $suffix = $suffix + $location
        $time = $file.CreationTime.ToString("yyyy-MM-dd_HH-mm-ss")

        if ($overrideTimeWithNow) {
            $time = Get-date -format "yyyy-MM-dd_HH-mm-ss"
        }

        $targetFileName = $time + $suffix + $file.Extension.ToLower()
        $targetPath = Join-Path $destination $targetFileName
        $percentComplete = [int](($currentIndex++ / $fileCount) * 100)
        $statusMessage = "From: " + $file.FullName + " to: " + $targetPath
        Write-Progress -Activity "Copying Files" -PercentComplete $percentComplete -Status "$percentComplete% Complete. Current Item: $statusMessage"
        Write-Host $statusMessage
        if (Test-Path $targetPath) {
            if ($skipDuplicates) {
                Write-Host "$targetPath exists and existing files are set to be skipped. Skipping file."
                continue
            }
            elseif ((Get-FileHash -Path $file.FullName -Algorithm MD5).Hash -eq (Get-FileHash -Path $targetPath -Algorithm MD5).Hash) {
                Write-Host "$targetPath exists with different content. Skipping file."
                continue
            }
        }

        Copy-Item -Path $file.FullName -Destination $targetPath
    }
}