<?php

declare(strict_types=1);

namespace App\Services;

use App\Models\Invoice;
use App\Models\InvoiceItem;
use Barryvdh\DomPDF\Facade\Pdf;
use Illuminate\Http\Response;

final class InvoiceService
{
    public function create(array $data, array $items): Invoice
    {
        $invoice = Invoice::create([
            ...$data,
            'invoice_number' => Invoice::generateNumber(),
            'subtotal'       => 0,
            'tax_amount'     => 0,
            'total'          => 0,
        ]);

        foreach ($items as $item) {
            $item['total'] = $item['quantity'] * $item['unit_price'];
            $invoice->items()->create($item);
        }

        $invoice->recalculate();

        return $invoice;
    }

    public function update(Invoice $invoice, array $data, array $items): Invoice
    {
        $invoice->update($data);
        $invoice->items()->delete();

        foreach ($items as $item) {
            $item['total'] = $item['quantity'] * $item['unit_price'];
            $invoice->items()->create($item);
        }

        $invoice->recalculate();

        return $invoice->fresh();
    }

    public function generatePdf(Invoice $invoice): Response
    {
        $invoice->load('client', 'items');

        $pdf = Pdf::loadView('invoices.pdf', compact('invoice'));
        $pdf->setPaper('A4', 'portrait');

        return $pdf->download("invoice-{$invoice->invoice_number}.pdf");
    }
}