Convert SXA search API URLs to raw queries

ConvertFrom-SxaSearchUrl.ps1

<#
Converts an SXA search results API URL into the raw query sent to the provider

Example:

ConvertFrom-SxaSearchUrl (Read-Host "URL (eg. http://localhost/sxa/search/results?q=...)") | Format-List
#>
function ConvertFrom-SxaSearchUrl
{
    param(
        [Uri]$uri
    )
    
    if (-not $uri)
    {
        return
    }
    
    $ErrorActionPreference = "Stop"
    
    $qs = [System.Web.HttpUtility]::ParseQueryString($uri.Query.Substring(1))
    
    if (-not $qs["site"]) {
        $multisiteContext = [Sitecore.DependencyInjection.ServiceLocator]::ServiceProvider.GetService([Sitecore.XA.Foundation.Multisite.IMultisiteContext])
        
        $site = $multisiteContext.GetSettingsItem( (Get-Item $qs["itemid"]) ).Axes.GetChild("Site Grouping").Children[0].Fields["SiteName"].Value
    } else {
        $site = $qs["site"]
        
    }
    
    $searchService = [Sitecore.DependencyInjection.ServiceLocator]::ServiceProvider.GetService([Sitecore.XA.Foundation.Search.Services.ISearchService])
    
    $indexName = ""; $queryable = $searchService.GetQuery($qs["q"],  $qs["s"], $null, $null, $site,  $qs["itemid"], [ref]$indexName)
    
    $getQuery = $queryable.GetType().GetMethod("GetQuery", [System.Reflection.BindingFlags]::NonPublic -bxor [System.Reflection.BindingFlags]::Instance)
    
    $query = $getQuery.Invoke($queryable, @($queryable.Expression))
    
    $getQueryIndex = $queryable.GetType().GetMethod("get_Index", [System.Reflection.BindingFlags]::NonPublic -bxor [System.Reflection.BindingFlags]::Instance)
    
    $queryIndex = $getQueryIndex.Invoke($queryable, @())
    
    $optimizeQuery = ($queryIndex.GetType().GetMethods([System.Reflection.BindingFlags]::NonPublic -bxor [System.Reflection.BindingFlags]::Instance) | ? Name -eq "OptimizeQueryExpression")
    
    if ($optimizeQuery -ne $null)
    {
        $index = [Sitecore.ContentSearch.ContentSearchManager]::GetIndex($indexName)
    
        $optimizedQuery = $optimizeQuery.Invoke($queryIndex, @($query, $index))[0] + '&$count=true'
    }
    else
    {
        $optimizedQuery = [string]$query
    }
    
    [psobject]@{
        Query = $optimizedQuery;
        Index = $indexName;
        Site = $site
    }
}