param(
    [Parameter(Mandatory=$true)]
    [string]$url
)

function Write-Log($msg)
{
    Write-Host $msg -foregroundcolor green
    ($msg) | Out-File "log-list-passive-users.txt" -Append
}

function Write-Warn($msg)
{
    Write-Host $msg -foregroundcolor yellow
    ($msg) | Out-File "log-list-passive-users.txt" -Append
}

function Is-User-Already-Added($loginName)
{
	foreach ($u in $global:users)
	{
		if ($u.ToLower() -eq $loginName.ToLower())
		{
			return $true
		}
	}
	return $false
}

function Is-User-Active($loginName)
{
	$wa = Get-SPWebApplication $url
	foreach ($site in $wa.Sites)
	{
		Write-Log ("    " + $site.Url)
		$user = $null
		$web = $site.RootWeb
		foreach ($u in $web.AllUsers)
		{
			if ($u.LoginName.ToLower() -eq $loginName.ToLower())
			{
				$user = $u
				break
			}
		}
		
		if ($user -eq $null)
		{
			foreach ($u in $web.SiteUsers)
			{
				if ($u.LoginName.ToLower() -eq $loginName.ToLower())
				{
					$user = $u
					break
				}
			}
		}
		
		if ($user -eq $null)
		{
			continue
		}
		
		if ($user.Groups.Count -gt 0)
		{
			Write-Log ("    User has groups")
			return $true
		}
	}
	return $false
}

function List-Passive-Users($site)
{
	Write-Log ($site.Url)
	#Write-Log ("Users length before: " + $global:users.Length)
    $web = $site.RootWeb
	foreach ($u in $web.AllUsers)
	{
		Write-Log ("  " + $u.LoginName)
		if (-not $u.LoginName.ToLower().StartsWith("i:0#.f|taloyhtio|"))
		{
			Write-Warn ("    Skip windows users")
			continue
		}

		$added = Is-User-Already-Added $u.LoginName
		if ($added)
		{
			Write-Warn ("    User already added")
			continue
		}
		
		$isActive = Is-User-Active $u.LoginName
		if ($isActive)
		{
			Write-Warn ("    User is active. Skip it")
			continue
		}
		
		$global:users += $u.LoginName
		Write-Log ("    User is added")
	}
	#Write-Log ("Users length after: " + $global:users.Length)
}

$global:users = @()
$webApp = Get-SPWebApplication $url
$webApp.Sites | ForEach-Object { List-Passive-Users $_ }
$global:users | ForEach-Object { $_ | Out-File "passive-users.txt" -Append }