<?php

namespace App\Services;

use App\Models\NavigationItem;
use Illuminate\Support\Collection;

class NavigationService
{
    /**
     * Get all navigation items for management.
     */
    public function getManagementItems(): Collection
    {
        return NavigationItem::with(['page', 'children.page'])
            ->whereNull('parent_id')
            ->orderBy('order')
            ->get();
    }

    /**
     * Get current top-level navigation items for selection.
     */
    public function getParentItems(): Collection
    {
        return NavigationItem::whereNull('parent_id')
            ->select('id', 'label')
            ->get();
    }

    /**
     * Synchronize a page's presence in the navigation.
     *
     * @param \App\Models\Page $page The page to sync.
     * @param bool $include Whether the page should be included in the navigation.
     * @return void
     */
    public function syncPageNavigation(\App\Models\Page $page, bool $include): void
    {
        if ($include) {
            $navigationItem = NavigationItem::where('page_id', $page->id)->first();
            if (!$navigationItem) {
                NavigationItem::create([
                    'label' => $page->title,
                    'page_id' => $page->id,
                    'order' => NavigationItem::max('order') + 1,
                    'target' => '_self',
                ]);
            } else {
                $navigationItem->update(['label' => $page->title]);
            }
        } else {
            NavigationItem::where('page_id', $page->id)->delete();
        }
    }

    /**
     * Store a new navigation item.
     */
    public function store(array $data): NavigationItem
    {
        $maxOrder = NavigationItem::where('parent_id', $data['parent_id'] ?? null)->max('order');
        $data['order'] = ($maxOrder !== null) ? $maxOrder + 1 : 0;

        return NavigationItem::create($data);
    }

    /**
     * Reorder navigation items.
     */
    public function reorder(array $items): void
    {
        foreach ($items as $index => $itemData) {
            $item = NavigationItem::find($itemData['id']);
            if ($item) {
                $item->update([
                    'order' => $index,
                    'parent_id' => $itemData['parent_id'] ?? null,
                ]);
            }
        }
    }

    /**
     * Delete a navigation item.
     */
    public function delete(NavigationItem $navigationItem): bool
    {
        return $navigationItem->delete();
    }
}