<?php

namespace App\Support;

use App\Models\InviteLayout;

class JoinTokenLayoutRegistry
{
    /**
     * Layout definitions for printable invite cards.
     *
     * @var array<string, array>
     */
    private const LAYOUTS = [
        'modern-poster' => [
            'id' => 'modern-poster',
            'name' => 'Modern Poster',
            'subtitle' => 'Große, auffällige Fläche – perfekt für den Eingangsbereich.',
            'description' => 'Helle Posteroptik mit diagonalem Farbband und deutlicher Call-to-Action.',
            'paper' => 'a4',
            'orientation' => 'portrait',
            'background' => '#F8FAFC',
            'text' => '#0F172A',
            'accent' => '#6366F1',
            'secondary' => '#CBD5F5',
            'badge' => '#0EA5E9',
            'qr' => ['size_px' => 340],
            'svg' => ['width' => 1080, 'height' => 1520],
            'instructions' => [
                'Scanne den Code und tritt dem Event direkt bei.',
                'Speichere deine Lieblingsmomente mit Foto-Uploads.',
                'Merke dir dein Gäste-Pseudonym für Likes und Badges.',
            ],
        ],
        'elegant-frame' => [
            'id' => 'elegant-frame',
            'name' => 'Elegant Frame',
            'subtitle' => 'Ein ruhiges Layout mit Fokus auf Eleganz.',
            'description' => 'Serifen-Schrift, pastellige Flächen und dezente Rahmen für elegante Anlässe.',
            'paper' => 'a4',
            'orientation' => 'portrait',
            'background' => '#FBF7F2',
            'text' => '#2B1B13',
            'accent' => '#C08457',
            'secondary' => '#E6D5C3',
            'badge' => '#8B5CF6',
            'qr' => ['size_px' => 300],
            'svg' => ['width' => 1080, 'height' => 1520],
            'instructions' => [
                'QR-Code scannen oder Link im Browser eingeben.',
                'Name eingeben, Lieblingssprache auswählen und loslegen.',
                'Zeige diesen Druck am Empfang als Orientierung für Gäste.',
            ],
        ],
        'bold-gradient' => [
            'id' => 'bold-gradient',
            'name' => 'Bold Gradient',
            'subtitle' => 'Farbverlauf mit starkem Kontrast.',
            'description' => 'Ein kraftvolles Farbstatement mit großem QR-Code – ideal für Partys.',
            'paper' => 'a4',
            'orientation' => 'portrait',
            'background' => '#F97316',
            'background_gradient' => [
                'angle' => 190,
                'stops' => ['#F97316', '#EC4899', '#8B5CF6'],
            ],
            'text' => '#FFFFFF',
            'accent' => '#FFFFFF',
            'secondary' => 'rgba(255,255,255,0.72)',
            'badge' => '#1E293B',
            'qr' => ['size_px' => 360],
            'svg' => ['width' => 1080, 'height' => 1520],
            'instructions' => [
                'Sofort scannen – der QR-Code führt direkt zum Event.',
                'Fotos knipsen, Challenges lösen und Likes sammeln.',
                'Teile den Link mit Freund:innen, falls kein Scan möglich ist.',
            ],
        ],
        'photo-strip' => [
            'id' => 'photo-strip',
            'name' => 'Photo Strip',
            'subtitle' => 'Layout mit Fotostreifen-Anmutung und Checkliste.',
            'description' => 'Horizontale Teilung, Platz für Hinweise und Storytelling.',
            'paper' => 'a4',
            'orientation' => 'portrait',
            'background' => '#FFFFFF',
            'text' => '#111827',
            'accent' => '#0EA5E9',
            'secondary' => '#94A3B8',
            'badge' => '#334155',
            'qr' => ['size_px' => 320],
            'svg' => ['width' => 1080, 'height' => 1520],
            'instructions' => [
                'Schritt 1: QR-Code scannen oder Kurzlink nutzen.',
                'Schritt 2: Profilname eingeben – kreativ sein!',
                'Schritt 3: Fotos hochladen und Teamaufgaben lösen.',
            ],
        ],
        'minimal-card' => [
            'id' => 'minimal-card',
            'name' => 'Minimal Card',
            'subtitle' => 'Kleine Karte – mehrfach druckbar als Tischaufsteller.',
            'description' => 'Schlichtes Kartenformat mit klarer Typografie und viel Weißraum.',
            'paper' => 'a4',
            'orientation' => 'portrait',
            'background' => '#F9FAFB',
            'text' => '#111827',
            'accent' => '#9333EA',
            'secondary' => '#E0E7FF',
            'badge' => '#64748B',
            'qr' => ['size_px' => 280],
            'svg' => ['width' => 1080, 'height' => 1520],
            'instructions' => [
                'Code scannen, Profil erstellen, Erinnerungen festhalten.',
                'Halte diese Karte an mehreren Stellen bereit.',
                'Für Ausdrucke auf 200 g/m² Kartenpapier empfohlen.',
            ],
        ],
    ];

    /**
     * Get layout definitions.
     *
     * @return array<int, array<string, mixed>>
     */
    public static function all(): array
    {
        $customLayouts = InviteLayout::query()
            ->where('is_active', true)
            ->orderBy('name')
            ->get();

        if ($customLayouts->isNotEmpty()) {
            return $customLayouts
                ->map(fn (InviteLayout $layout) => self::normalize(self::fromModel($layout)))
                ->values()
                ->all();
        }

        return array_values(array_map(fn ($layout) => self::normalize($layout), self::LAYOUTS));
    }

    /**
     * Find a layout definition.
     */
    public static function find(string $id): ?array
    {
        $custom = InviteLayout::query()
            ->where('slug', $id)
            ->where('is_active', true)
            ->first();

        if ($custom) {
            return self::normalize(self::fromModel($custom));
        }

        $layout = self::LAYOUTS[$id] ?? null;

        return $layout ? self::normalize($layout) : null;
    }

    /**
     * Normalize and merge default values.
     */
    private static function normalize(array $layout): array
    {
        $defaults = [
            'subtitle' => '',
            'description' => '',
            'paper' => 'a4',
            'orientation' => 'portrait',
            'background' => '#F9FAFB',
            'text' => '#0F172A',
            'accent' => '#6366F1',
            'secondary' => '#CBD5F5',
            'badge' => '#2563EB',
            'badge_label' => 'Digitale Gästebox',
            'instructions_heading' => "So funktioniert's",
            'link_heading' => 'Alternative zum Einscannen',
            'cta_label' => 'Scan mich & starte direkt',
            'cta_caption' => 'Scan mich & starte direkt',
            'link_label' => null,
            'logo_url' => null,
            'qr' => [
                'size_px' => 320,
            ],
            'svg' => [
                'width' => 1080,
                'height' => 1520,
            ],
            'background_gradient' => null,
            'instructions' => [],
            'formats' => ['pdf', 'svg'],
        ];

        return array_replace_recursive($defaults, $layout);
    }

    private static function fromModel(InviteLayout $layout): array
    {
        $preview = $layout->preview ?? [];
        $options = $layout->layout_options ?? [];
        $instructions = $layout->instructions ?? [];

        return array_filter([
            'id' => $layout->slug,
            'name' => $layout->name,
            'subtitle' => $layout->subtitle,
            'description' => $layout->description,
            'paper' => $layout->paper,
            'orientation' => $layout->orientation,
            'background' => $preview['background'] ?? null,
            'background_gradient' => $preview['background_gradient'] ?? null,
            'text' => $preview['text'] ?? null,
            'accent' => $preview['accent'] ?? null,
            'secondary' => $preview['secondary'] ?? null,
            'badge' => $preview['badge'] ?? null,
            'badge_label' => $options['badge_label'] ?? null,
            'instructions_heading' => $options['instructions_heading'] ?? null,
            'link_heading' => $options['link_heading'] ?? null,
            'cta_label' => $options['cta_label'] ?? null,
            'cta_caption' => $options['cta_caption'] ?? null,
            'link_label' => $options['link_label'] ?? null,
            'logo_url' => $options['logo_url'] ?? null,
            'qr' => array_filter([
                'size_px' => $preview['qr']['size_px'] ?? $options['qr']['size_px'] ?? $preview['qr_size_px'] ?? $options['qr_size_px'] ?? null,
            ]),
            'svg' => array_filter([
                'width' => $preview['svg']['width'] ?? $options['svg']['width'] ?? $preview['svg_width'] ?? $options['svg_width'] ?? null,
                'height' => $preview['svg']['height'] ?? $options['svg']['height'] ?? $preview['svg_height'] ?? $options['svg_height'] ?? null,
            ]),
            'formats' => $options['formats'] ?? ['pdf', 'svg'],
            'instructions' => $instructions,
        ], fn ($value) => $value !== null && $value !== []);
    }

    /**
     * Map layouts into an API-ready response structure, attaching URLs.
     *
     * @param  callable(string $layoutId, string $format): string  $urlResolver
     * @return array<int, array<string, mixed>>
     */
    public static function toResponse(callable $urlResolver): array
    {
        return array_map(function (array $layout) use ($urlResolver) {
            $formats = $layout['formats'] ?? ['pdf', 'svg'];

            return [
                'id' => $layout['id'],
                'name' => $layout['name'],
                'description' => $layout['description'],
                'subtitle' => $layout['subtitle'],
                'preview' => [
                    'background' => $layout['background'],
                    'background_gradient' => $layout['background_gradient'],
                    'accent' => $layout['accent'],
                    'text' => $layout['text'],
                ],
                'formats' => $formats,
                'download_urls' => collect($formats)
                    ->mapWithKeys(fn ($format) => [$format => $urlResolver($layout['id'], $format)])
                    ->all(),
            ];
        }, self::all());
    }
}