<?php

namespace Longyi\FrontMenu\Repositories;

use Illuminate\Support\Facades\Cache;
use Longyi\FrontMenu\Models\FrontMenuItem;
use Webkul\Core\Eloquent\Repository;

class FrontMenuItemRepository extends Repository
{
    public function model()
    {
        return FrontMenuItem::class;
    }

    /**
     * Build a hierarchical tree (up to three levels) of all menu items.
     */
    public function getMenuTree(bool $onlyEnabled = false)
    {
        $query = $this->model->newQuery();

        if ($onlyEnabled) {
            $query->where('status', 1);
        }

        $items = $query->orderBy('parent_id')
            ->orderBy('sort_order')
            ->orderBy('id')
            ->get();

        return collect($this->buildTree($items));
    }

    /**
     * Get the enabled front menu tree, cached for the frontend / GraphQL.
     */
    public function getEnabledMenuTree()
    {
        return Cache::remember('front_menu_tree', 3600, function () {
            return $this->getMenuTree(true);
        });
    }

    /**
     * Recursively build the menu tree.
     */
    protected function buildTree($items, ?int $parentId = null)
    {
        $tree = [];

        foreach ($items as $item) {
            $itemParentId = $item->parent_id === null ? null : (int) $item->parent_id;

            if ($itemParentId === $parentId) {
                $children = $this->buildTree($items, (int) $item->id);

                $item->setRelation('children', collect($children));

                $tree[] = $item;
            }
        }

        return $tree;
    }

    /**
     * Clear the front menu cache.
     */
    public function clearCache(): void
    {
        Cache::forget('front_menu_tree');
        Cache::forget('front_menu_items');
    }
}