<?php

namespace Peidikeji\Goods;

use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use Peidikeji\Goods\Models\Goods;
use Peidikeji\Goods\Models\GoodsSku;

class GoodsService
{
    public static function make(...$params)
    {
        return new static(...$params);
    }

    public function generateSn()
    {
        return (string) Str::uuid();
    }

    public function clearSku(Goods $goods)
    {
        GoodsSku::where('goods_id', $goods->id)->delete();
    }

    /**
     * 根据规格生成SKU
     *
     * @param  Goods  $goods 商品
     * @param  array  $options {spec: 指定规格, price: 基础价格, name: 基础名称, stock: 默认库存, name_add: 是否在名称上面追加属性值, price_add: 是否在价格上面追加属性的加价}
     */
    public function generateSku(Goods $goods, $options = [])
    {
        $spec = data_get($options, 'spec', $goods->spec);
        $price = floatval(data_get($options, 'price', $goods->price));

        $name = data_get($options, 'name', $goods->name);
        $stock = intval(data_get($options, 'stock', $goods->stock));
        $nameAdd = (bool) data_get($options, 'name_add', false);
        $priceAdd = (bool) data_get($options, 'price_add', false);
        if ($spec) {
            $specList = [];
            foreach ($spec as $item) {
                $items = [];
                foreach ($item['values'] as $value) {
                    array_push($items, [
                        'name' => $item['name'],
                        'value' => $value['name'],
                        'price' => floatval($value['value']),
                    ]);
                }
                array_push($specList, $items);
            }
            $cartesianList = Arr::crossJoin(...$specList);
            foreach ($cartesianList as $items) {
                $specPrice = $priceAdd ? $price + array_sum(array_column($items, 'price')) : $price;
                $specName = $nameAdd ? $name.' '.implode(' ', array_column($items, 'value')) : $name;
                $exists = $goods->skus()->jsonArray($items)->exists();
                $attributes = [
                    'name' => $specName,
                    'price' => $specPrice,
                    'stock' => $stock,
                    'spec' => $items,
                ];
                if ($exists) {
                    $goods->skus()->jsonArray($items)->update($attributes);
                } else {
                    $attributes['sn'] = $this->generateSn();
                    $goods->skus()->create($attributes);
                }
            }
        }
    }
}