param( 
    [string]$url
)

function Rename-Field($site)
{
    Write-Host "Rename field on" $site.Url -foregroundcolor green
    $u = [Microsoft.SharePoint.Utilities.SPUrlUtility]::CombineUrl($site.Url, "lomakkeet")
    $web = Get-SPWeb $u -ErrorAction SilentlyContinue
    if ($web -eq $null)
    {
        Write-Host "    Web $u not found" -foregroundcolor yellow
        return
    }

    $list = $null
    foreach($l in $web.Lists)
    {
        if ($l.Title.ToLower() -eq "vikailmoitukset")
        {
            $list = $l
            break
        }
    }

    if ($list -eq $null)
    {
        Write-Host "    List not found" -foregroundcolor yellow
        return
    }

    $ct = $null
    foreach ($c in $list.ContentTypes)
    {
        if ($c.Name.ToLower() -eq "lomake")
        {
            $ct = $c
            break
        }
    }

    if ($ct -eq $null)
    {
        Write-Host "    Content type not found" -foregroundcolor yellow
        return
    }


    $fl = $null
    foreach ($f in $list.Fields)
    {
        if ($f.Title.ToLower() -eq "asunto")
        {
            $fl = $f
            break
        }
    }

    if ($fl -eq $null)
    {
        Write-Host "    Field not found" -foregroundcolor yellow
        return
    }

    $lcid = [int]$web.Language
    $ci = New-Object -TypeName System.Globalization.CultureInfo -ArgumentList $lcid
    [System.Threading.Thread]::CurrentThread.CurrentCulture = $ci
    [System.Threading.Thread]::CurrentThread.CurrentUICulture = $ci

    $fl.Title = "Huoneisto"
    $fl.Update()
    Write-Host "    Field was successfully renamed" -foregroundcolor green
}

Start-Transcript -Path "output.log" -Append -Force -Confirm:$false

if (-not $url)
{
    Write-Host "Specify site url in url parameter" -foregroundcolor red
    return
}

$webApp = Get-SPWebApplication $url
$webApp.Sites | ForEach-Object { Rename-Field $_ }

#$s = Get-SPSite "http://taloyhtio.mobimus.com/demo4"
#Rename-Field $s

Stop-Transcript