param(
    [string]$token=$env:GL_TOKEN,
    [string]$server="https://gitlab.corp.wabtec.com",
    [string]$group="annax/teams/developers",
    [string]$access_level="30",
    [switch]$delete,
    [Parameter(Mandatory=$true,ValueFromPipeline = $true)]
    [string[]]$input
)

Add-Type -AssemblyName System.Web

if (-not (Get-Module Powershell-Yaml)){
    Install-Module -Name Powershell-Yaml -Scope CurrentUser -Force
}
Import-Module Powershell-Yaml

$groupid = [System.Web.HttpUtility]::UrlEncode($group)

$uri = ($server + "/api/v4/groups/" + $groupid + "/invitations")

$headers = @{ 'PRIVATE-TOKEN'=$token }

$input | ForEach-Object {
    
    if (-not $delete){
        $mail = $_.ToLower()
        "Inviting: " + $mail
        $body = "email=$mail&access_level=$access_level"
        Invoke-RestMethod -Headers $headers -Uri $uri -Method post -Body $body |convertto-yaml
    } else {
        $mail = $_
        "Uninviting: " + $mail
        $uri_user = $uri + "/" + $mail
        Invoke-RestMethod -Headers $headers -Uri $uri_user -Method delete |convertto-yaml

    }
}