[CmdletBinding()]
param (
    [Parameter()]
    [string]
    $Path,

    [Parameter()]
    [string]
    $PsxList
)

$Header = (Get-Content -Path $PsxList -TotalCount 1).Split(';')

$Csv = Import-Csv $PsxList -Delimiter ';' -Header $Header

$FileList = Get-ChildItem -Path $Path -Filter "*.psv"

$GameIdLength = 8

ForEach ($FileName in $FileList) {
    $GameId = $FileName.Name.Substring(2, 2 + $GameIdLength)
    $UniqueId = $FileName.Name.Substring(2 + 2 + $GameIdLength)

    $Title = $csv | Where-Object { $_.GameID -eq $GameId}
    if($Title.Length -gt 0) {
        if($UniqueId.Length -gt 0) {
            $NewName = "$($Title.Name)_$UniqueId"
        }
        else {
            $NewName = $Title.Name
        }
        Write-Host "Renaming $($FileName.Name) to $NewName"
        Rename-Item -Path $FileName -NewName $NewName
    }
}