osb/app/Http/Controllers/User/AccountController.php

<?php

namespace App\Http\Controllers\User;

use App\Http\Controllers\Controller;
use App\Models\{Account,Invoice};

class AccountController extends Controller
{
	/**
	 * Show the users next invoice
	 */
	public function view_invoice_next(Account $o)
	{
		$io = new Invoice;
		$io->account = $o;

		// Get the account services
		$s = $o->services(TRUE)
			->with(['invoice_items','charges'])
			->get()
			->filter(function($item) {
				return ! $item->suspend_billing AND ! $item->external_billing;
			});

		// Get our invoice due date for this invoice
		$io->due_at = $s->min(function($item) { return $item->invoice_next; });

		// @todo The days in advance is an application parameter
		$io->created_at = $io->due_at->subDays(30);

		// Work out items to add to this invoice, plus any in the next additional days
		$days = now()->diffInDays($io->due_at)+1+7;
		foreach ($s as $so)
		{
			if ($so->isInvoiceDueSoon($days))
				foreach ($so->next_invoice_items() as $o)
					$io->items->push($o);
		}

		return View('u.invoice.home',['o'=>$io]);
	}
}