<?php

namespace Modules\Stylist\Support;

use Illuminate\Support\Facades\Route;
use Illuminate\Support\Facades\Schema;
use Modules\Menus\Models\Menu;
use Throwable;

final class FrontendNavigation
{
    /** @return array<int, array<string, mixed>> */
    public function primary(): array
    {
        return $this->forLocations(['primary', 'header', 'main'], $this->fallbackPrimary());
    }

    /** @return array<int, array<string, mixed>> */
    public function footer(): array
    {
        return $this->forLocations(['footer'], $this->fallbackFooter());
    }

    /** @param array<int, string> $locations
     *  @param array<int, array<string, mixed>> $fallback
     *  @return array<int, array<string, mixed>>
     */
    private function forLocations(array $locations, array $fallback): array
    {
        try {
            if (! Schema::hasTable('menus')) {
                return $fallback;
            }

            $menu = Menu::query()
                ->where('enabled', true)
                ->whereIn('location', $locations)
                ->orderByRaw('CASE location '.collect($locations)->map(fn (string $location, int $index) => "WHEN ? THEN {$index}")->implode(' ').' ELSE 999 END', $locations)
                ->first();

            if (! $menu || ! is_array($menu->items) || $menu->items === []) {
                return $fallback;
            }

            $items = $this->normaliseItems($menu->items);

            return $items === [] ? $fallback : $items;
        } catch (Throwable) {
            return $fallback;
        }
    }

    /** @param array<int, mixed> $items
     *  @return array<int, array<string, mixed>>
     */
    private function normaliseItems(array $items): array
    {
        return collect($items)
            ->filter(fn (mixed $item): bool => is_array($item) && ($item['enabled'] ?? true) !== false)
            ->map(function (array $item): ?array {
                $label = trim((string) ($item['label'] ?? $item['title'] ?? $item['name'] ?? ''));
                if ($label === '') {
                    return null;
                }

                $url = $this->resolveUrl($item);
                if ($url === null) {
                    return null;
                }

                return [
                    'label' => $label,
                    'url' => $url,
                    'target' => ($item['target'] ?? null) === '_blank' ? '_blank' : null,
                    'children' => $this->normaliseItems((array) ($item['children'] ?? $item['items'] ?? [])),
                ];
            })
            ->filter()
            ->values()
            ->all();
    }

    /** @param array<string, mixed> $item */
    private function resolveUrl(array $item): ?string
    {
        $routeName = trim((string) ($item['route'] ?? $item['route_name'] ?? ''));
        if ($routeName !== '' && Route::has($routeName)) {
            return route($routeName, (array) ($item['parameters'] ?? []));
        }

        $pageSlug = trim((string) ($item['page_slug'] ?? $item['slug'] ?? ''));
        if ($pageSlug !== '' && Route::has('pages.public.show')) {
            return route('pages.public.show', $pageSlug);
        }

        $url = trim((string) ($item['url'] ?? $item['href'] ?? ''));

        return $url !== '' ? $url : null;
    }

    /** @return array<int, array<string, mixed>> */
    private function fallbackPrimary(): array
    {
        $items = [['label' => 'Home', 'url' => url('/'), 'target' => null, 'children' => []]];

        if (Route::has('blog.public.index')) {
            $items[] = ['label' => 'Blog', 'url' => route('blog.public.index'), 'target' => null, 'children' => []];
        }
        if (Route::has('news.public.index')) {
            $items[] = ['label' => 'News', 'url' => route('news.public.index'), 'target' => null, 'children' => []];
        }

        return $items;
    }

    /** @return array<int, array<string, mixed>> */
    private function fallbackFooter(): array
    {
        return $this->fallbackPrimary();
    }
}