# Copyright 2012 Aaron Jensen
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
#     http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

function Add-IisDefaultDocument
{
    <#
    .SYNOPSIS
    Adds a default document name to a website.
    
    .DESCRIPTION
    If you need a custom default document for your website, this function will add it.  The `FileName` argument should be a filename IIS should use for a default document, e.g. home.html.
    
    If the website already has `FileName` in its list of default documents, this function silently returns.
    
    .EXAMPLE
    Add-IisDefaultDocument -SiteName MySite -FileName home.html
    
    Adds `home.html` to the list of default documents for the MySite website.
    #>
    [CmdletBinding()]
    param(
        [Parameter(Mandatory=$true)]
        [string]
        # The name of the site where the default document should be added.
        $SiteName,
        
        [Parameter(Mandatory=$true)]
        [string]
        # The default document to add.
        $FileName
    )
    
    $xml = [xml] (Invoke-AppCmd list config $SiteName /section:defaultDocument )
    $docNode = $xml.SelectSingleNode( "/system.webServer/defaultDocument/files/add[@value = '$FileName']" )
    if( -not $docNode )
    {
        Invoke-AppCmd set config $SiteName /section:defaultDocument "/+files.[value='$FileName']" /commit:apphost
    }
}