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###############
## GRAPH API ##
###############
Param(
    $tenantId = "",
    $appServiceObjectID = "", 
    $PermissionsToAdd = @("Organization.Read.All", "User.Read.All", "Group.Read.All", "GroupMember.ReadWrite.All", "Reports.Read.All", "AuditLog.Read.All")
)

# Install AzureAD module if not installed
if (-Not(Get-Module -ListAvailable -Name AzureAD)) {
    try {
        Install-Module AzureAD -Force
    }
    catch {
        if ($_.Exception.Message.Contains("Administrator rights")) {
            Write-Host "You must run the script with administrator rights"
            
        }
        else {
            Write-Error $_.Exception.Message
        }
        
    }
}


if (Get-Module -ListAvailable -Name AzureAD) {
    # Check if connected to the target Azure AD Tenant
    try { 
        $tenantDetail = Get-AzureADTenantDetail 
    } 
    catch [Microsoft.Open.Azure.AD.CommonLibrary.AadNeedAuthenticationException] 
    { 
        Write-Host "You're not connected."; 
        Connect-AzureAD -TenantId $tenantId;
        $tenantDetail = Get-AzureADTenantDetail 
    }

    if ($tenantDetail.ObjectId -ne $tenantId) {
        Write-Host "You're not connected to the tenant: " $tenantId; 
        Connect-AzureAD -TenantId $tenantId;
    }


    # Managed Identity for the SCIM App Service | Found in App Service -> Identity 
    $ManagedIdentitiesServicePrincipal = Get-AzureADServicePrincipal -Filter "ObjectId eq `'$appServiceObjectID`'"
    if ($ManagedIdentitiesServicePrincipal -eq $null) {
        throw "Managed Identity for the app service is not found. `nApp Service Object ID: $appServiceObjectID "
    }

    # Resource Name : Microsoft Graph | Resource URI : https://graph.microsoft.com | Application ID : 00000003-0000-0000-c000-000000000000
    $GraphAppId = "00000003-0000-0000-c000-000000000000"
    $GraphServicePrincipal = Get-AzureADServicePrincipal -Filter "appId eq '$GraphAppId'"

    # Permissions
    foreach ($PermissionToAdd in $PermissionsToAdd) {
        $AppRole = $GraphServicePrincipal.AppRoles | Where-Object {$_.Value -eq $PermissionToAdd.Trim() -and $_.AllowedMemberTypes -contains "Application"}
        if ($AppRole -eq $null) {
            Write-Error "Invalid Permission `nPermission name: $PermissionToAdd"
        }
        else {
            # Assigns a Graph API service principal to an application role
            try {
                New-AzureAdServiceAppRoleAssignment -ObjectId $ManagedIdentitiesServicePrincipal.ObjectId -PrincipalId $ManagedIdentitiesServicePrincipal.ObjectId -ResourceId $GraphServicePrincipal.ObjectId -Id $AppRole.Id -ErrorAction Stop
            }
            catch {
                if ($_.Exception.ErrorContent.Message.Value.Contains("Permission being assigned already")) {
                    Write-Host "`""$AppRole.DisplayName"`"" " Permission is already assigned on the app service"
                }
                else {
                    Write-Error $_
                }
            }
        }
    }
}