param (
    [Parameter(Mandatory = $true, ValueFromRemainingArguments = $true)]
    [string[]]$InputFiles
)

# Get full paths of dropped files
$files = $InputFiles | Where-Object { Test-Path $_ -and -not (Test-Path $_ -PathType Container) }

if ($files.Count -eq 0) {
    Write-Host "No files provided."
    Read-Host -Prompt "Press Enter to exit"
    exit
}

# Extract just the file names
$fileNames = $files | ForEach-Object { [System.IO.Path]::GetFileNameWithoutExtension($_) }

# Find common prefix
function Get-CommonPrefix {
    param ([string[]]$names)
    if ($names.Count -eq 0) { return "" }
    $prefix = $names[0]
    foreach ($name in $names) {
        $i = 0
        while ($i -lt $prefix.Length -and $i -lt $name.Length -and $prefix[$i] -eq $name[$i]) {
            $i++
        }
        $prefix = $prefix.Substring(0, $i)
        if ($prefix -eq "") { break }
    }
    return $prefix.Trim("_- ")
}

$commonPrefix = Get-CommonPrefix -names $fileNames

if ([string]::IsNullOrWhiteSpace($commonPrefix)) {
    Write-Host "No common prefix found."
    Read-Host -Prompt "Press Enter to exit"
    exit
}

# Use folder of the first file as base
$baseFolder = Split-Path -Path $files[0] -Parent
$targetFolder = Join-Path $baseFolder $commonPrefix

# Create target folder if needed
if (!(Test-Path $targetFolder)) {
    New-Item -ItemType Directory -Path $targetFolder | Out-Null
}

# Move files
foreach ($file in $files) {
    Move-Item -Path $file -Destination $targetFolder
}

Write-Host "Moved $($files.Count) files into '$targetFolder'"
Read-Host -Prompt "Press Enter to exit"