##########################################################
#
# Script-Name: Remove-SPUser.ps1
#
# authors:     Niklas Goude
#              Mattias Karlsson
#
# Url:         http://mysharepointofview.com
#              http://www.PowerShell.nu
#
##########################################################

param ([string]$Site, [string]$SiteCollection, [string]$User, [switch]$help)

function GetHelp() {

$HelpText = @"

DESCRIPTION:

NAME: Remove-SPUser.ps1
Removes a User from the Site Collection

PARAMETERS: 

-Site              Url to the Sharepoint Site (Required)
-SiteCollection    Name of Site Collection (Required)
-User              User that you want to remove (Required)
-help              Prints the HelpFile (Optional)

SYNTAX:

./Remove-SPUser http://wss Test Domain\User

Removes the domain user Domain\User
from the Test SiteCollection
http://wss/Test

./Create-Sites.ps1 -help

Displays the help topic for the script

"@
$HelpText
}

function RemoveUser([string]$Site, [string]$SiteCollection, [string]$User) {

	# GAC

	[System.Reflection.Assembly]::LoadWithPartialName("System.Web") | Out-Null
	[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint") | Out-Null

	# Connect To Sharepoint

	$SPSite = New-Object Microsoft.SharePoint.SPSite($Site)
	$OpenWeb = $SPSite.OpenWeb($SiteCollection)

	# Check if User Exists in Site

	if ($OpenWeb.SiteUsers | Where {$_.LoginName -eq $User}) {
		$User = $OpenWeb.SiteUsers | Where {$_.LoginName -eq $User}
		$OpenWeb.SiteUsers.Remove($User)

		Write-Host "User: $User Successfully Removed from Site: $Site/$SiteCollection" -ForegroundColor Green
	} else {
	Write-Host "User: $User Does not exist on Site: $Site/$SiteCollection" -ForegroundColor Yellow
	}
	$SPSite.Dispose()
	$OpenWeb.Dispose()
}

if($help) { GetHelp }
if($Site -AND $SiteCollection -AND $User) { 
	RemoveUser $Site $SiteCollection $User 
} else {
	GetHelp
}