<?php

namespace app\common\service;

use app\common\model\Category;
use app\common\traits\ServiceTrait;
use Exception;
use fast\Tree;

class CategoryService
{
    use ServiceTrait;

    /** @var Category */
    public static $Model = Category::class;

    public static function getTreeArray($type = 'goods', $pid = 0)
    {
        $tree = Tree::instance();
        $list = self::$Model::where('type', $type)->order('weigh asc,id asc')->select();
        $tree->init(collection($list)->toArray(), 'pid');

        return self::transformTree($tree->getTreeArray(0));
    }

    public static function getOptions($type = 'goods', $pid = 0)
    {
        $list = self::$Model::where('type', $type)->where('status', 'normal')->order('weigh asc,id asc')->column('name', 'id');
        return $list;
    }

    /**
     * 首页轮播：分类类型 banner，仅正常状态，按权重从高到低
     * @return array
     */
    public static function getBannerList()
    {
        $list = self::getList(['type' => 'banner', 'status' => 'normal'], 0, 'weigh desc,id desc');
        $rows = [];
        foreach ($list as $item) {
            $image = (string)($item['image'] ?? '');
            if ($image === '') {
                continue;
            }
            $rows[] = [
                'name' => (string)($item['name'] ?? ''),
                'image' => cdnurl($image, true),
                'description' => (string)($item['description'] ?? ''),
            ];
        }
        return $rows;
    }

    public static function transformTree($data)
    {
        return array_map(function ($item) {
            $transformedItem = [
                'groupId' => (string)$item['id'],
                'thumbnail' => $item['image'] ?: 'https://cdn-we-retail.ym.tencent.com/miniapp/category/category-default.png',
                'name' => $item['name']
            ];

            if (isset($item['childlist']) && is_array($item['childlist']) && count($item['childlist']) > 0) {
                $transformedItem['children'] = self::transformTree($item['childlist']);
            }

            return $transformedItem;
        }, $data);
    }
}