<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Http\Option;
use App\Models\Invoice;
use Symfony\Component\HttpFoundation\StreamedResponse;

class EController extends Controller
{
    /**
     * Return an invoice as download for the specified resource.
     */
    public function downloadInvoice(int $id): StreamedResponse
    {
        $invoice = Invoice::find($id);
        $taxes = self::buildTaxes($invoice->items);

        return response()->streamDownload(function () use ($invoice, $taxes) {
            echo view('xml.invoice', ['invoice' => $invoice, 'options' => Option::optionsAsObject(), 'taxes' => $taxes]);
        }, 'test.xml', ['Content-Type' => 'application/xml']);

    }

    /**
     * Return a rendered xml invoice as string to build an email attachment from it for the specified resource.
     */
    public function attachInvoice(int $id): string
    {
        $invoice = Invoice::find($id);
        $taxes = self::buildTaxes($invoice->items);

        return view('xml.invoice', ['invoice' => $invoice, 'options' => Option::optionsAsObject(), 'taxes' => $taxes])->render();
    }

    /**
     * Build taxes for the given invoice items grouped by tax.
     */
    private static function buildTaxes($items): array
    {
        $taxes = [];
        foreach ($items as $item) {
            if (!isset($taxes[$item->tax])) {
                $taxes[$item->tax] = ['tax' => 0, 'taxable' => 0];
            }
            $taxes[$item->tax]['tax'] += round($item->price * $item->amount * ($item->tax / 100) * (100 - $item->discount) / 100, 2, PHP_ROUND_HALF_UP);
            $taxes[$item->tax]['taxable'] += $item->price * $item->amount * (100 - $item->discount) / 100;
        }

        return $taxes;
    }
}