<?php

namespace App\Services\Billing;

use App\Support\CompanyProfile;

/**
 * A specimen invoice, for looking at the layout before anything is issued.
 *
 * It uses the real company details where they have been entered and obvious
 * placeholders where they have not, so the preview shows what is still missing
 * rather than a page that looks finished and is not.
 *
 * The customer and the lines are invented on purpose and say so. A specimen
 * that looks like a real document is a specimen somebody eventually files.
 */
final class SampleInvoice
{
    /** @return array<string, mixed> */
    public static function snapshot(): array
    {
        $issuer = CompanyProfile::all();

        // Every field a placeholder, not only the required ones. A specimen
        // exists to show the layout, and a footer with two of its four columns
        // empty shows a layout that is not there — the first version of this
        // was read as a missing footer rather than as missing data.
        $placeholders = [
            'name' => 'Ihr Firmenwortlaut e.U.',
            'address' => 'Musterstraße 1',
            'postcode' => '1010',
            'city' => 'Wien',
            'country' => 'Österreich',
            'phone' => '+43 000 000000',
            'email' => 'office@ihre-domain.at',
            'website' => 'www.ihre-domain.at',
            'register_number' => 'FN 000000a',
            'register_court' => 'Handelsgericht Wien',
            'vat_id' => 'ATU00000000',
            'bank_name' => 'Bank: Ihre Bank',
            'iban' => 'AT00 0000 0000 0000 0000',
            'bic' => 'BIC: XXXXATWW',
        ];

        foreach ($placeholders as $field => $placeholder) {
            if (trim((string) ($issuer[$field] ?? '')) === '') {
                $issuer[$field] = $placeholder;
            }
        }

        $rate = (int) round(CompanyProfile::taxRate() * 100);

        $lines = [
            [
                'description' => 'CluPilot Cloud — Paket Start',
                'details' => ['Abrechnungszeitraum 01.08.2026 – 31.08.2026', '500 GB Speicher, 4 Kerne, 8 GB RAM'],
                'quantity_milli' => 1000,
                'unit' => '',
                'unit_net_cents' => 1900,
            ],
            [
                'description' => 'Zusatzspeicher 250 GB',
                'details' => ['Add-on, monatlich'],
                'quantity_milli' => 2000,
                'unit' => '',
                'unit_net_cents' => 500,
            ],
            [
                'description' => 'Zusätzliches Datenvolumen',
                'details' => ['Add-on, monatlich'],
                'quantity_milli' => 1000,
                'unit' => '',
                'unit_net_cents' => 900,
            ],
            [
                'description' => 'Einrichtung und Datenübernahme',
                'details' => ['einmalig, 2,5 Stunden'],
                'quantity_milli' => 2500,
                'unit' => 'Std.',
                'unit_net_cents' => 9000,
            ],
        ];

        // A discount on the specimen deliberately: it is the part of the layout
        // most likely to be wrong, and the only way to find that out is to see
        // it printed.
        $adjustment = ['type' => InvoiceMath::PERCENT, 'value' => -1000];

        $totals = InvoiceMath::totals($lines, $adjustment, $rate) + ['rate_basis_points' => $rate];

        return [
            'issuer' => $issuer,
            'customer' => [
                'name' => 'Muster GmbH (Beispiel)',
                'address' => 'Beispielgasse 12/3',
                'postcode' => '1030',
                'city' => 'Wien',
                'country' => 'Österreich',
                'vat_id' => 'ATU11111111',
            ],
            'meta' => [
                'title' => __('invoice.title'),
                'number' => 'RE-'.now()->format('Y').'-0001',
                'customer_number' => 'KN-0001',
                'issued_on' => now()->local()->format('d.m.Y'),
                'due_on' => now()->local()->addDays((int) CompanyProfile::get('payment_days', 14))->format('d.m.Y'),
                'currency' => 'EUR',
                'salutation' => 'Sehr geehrte Damen und Herren,',
                'intro' => 'wir erlauben uns, für die im Folgenden aufgeführten Leistungen in Rechnung zu stellen.',
                'adjustment_label' => 'Rabatt 10 %',
                'payment_terms' => trim((string) CompanyProfile::get('payment_terms')) !== ''
                    ? (string) CompanyProfile::get('payment_terms')
                    : 'Zahlbar ohne Abzug innerhalb von '.CompanyProfile::get('payment_days', 14).' Tagen auf das unten angeführte Konto.',
                'closing' => 'Dies ist ein Muster zur Ansicht des Layouts. Es ist keine Rechnung und keine Zahlungsaufforderung.',
            ],
            'lines' => $lines,
            'totals' => $totals,
        ];
    }
}