<?php

namespace App\Admin\Forms;

use App\Models\ProductGift;
use App\Models\ProductSku;
use Dcat\Admin\Contracts\LazyRenderable;
use Dcat\Admin\Form\NestedForm;
use Dcat\Admin\Traits\LazyWidget;
use Dcat\Admin\Widgets\Form;
use Illuminate\Support\Facades\DB;
use Throwable;

class SkuGift extends Form implements LazyRenderable
{
    use LazyWidget;

    /**
     * @param Model|Authenticatable|HasPermissions|null $user
     *
     * @return bool
     */
    protected function authorize($user): bool
    {
        return $user->can('dcat.admin.product_skus.sku_gift');
    }

    /**
     * Handle the form request.
     *
     * @param array $input
     *
     * @return mixed
     */
    public function handle(array $input)
    {
        $giftSkuIds = [];
        $giftSku = [];
        $delGiftIds = [];
        foreach ($input['gifts'] as $gift) {
            if ($gift['_remove_'] == 1) {
                $delGiftIds[] = $gift['id'];
            } else {
                if (is_null($gift['id'])) {
                    $gift['remaining'] = $gift['limit'];//剩余数量；
                    $giftSku[] = new ProductGift($gift);
                } else {
                    $_gift = ProductGift::find($gift['id']);
                    $_gift->gift_sku_id = $gift['gift_sku_id'];
                    $_gift->num = $gift['num'];
                    $_gift->limit = $gift['limit'];
                    $_gift->remaining = $gift['limit'] > 0 ? ($gift['limit'] - $_gift->sent) : $gift['limit'];
                    if ($_gift->remaining < 0) {
                        return $this->response()->error('无法设置限制数量小于已发数量');
                    }
                    $giftSku[] = $_gift;
                }
            }
        }
        $skuId = $input['sku_id'];
        $sku = ProductSku::findOrFail($skuId);
        if ($sku->verify_state == 1 || !is_null($sku->release_at)) {//如果是审核中，或者上架中，则无法修改。
            return $this->response()->error('当前商品目前无法修改赠品');
        }
        try {
            DB::beginTransaction();
            $sku->gifts()->saveMany($giftSku);

            ProductGift::whereIn('id', $delGiftIds)->delete();
            DB::commit();
        } catch (Throwable $th) {
            DB::rollBack();
            report($th);
            return $this->response()->error('操作失败:'.$th->getMessage())->refresh();
        }

        return $this->response()
                    ->success(__('admin.update_succeeded'))
                    ->refresh();
    }

    /**
     * Build a form here.
     */
    public function form()
    {
        $id = $this->payload['id'] ?? 0;
        $sku = ProductSku::with('gifts')->findOrFail($id);

        $this->hasMany('gifts', function (NestedForm $form) {
            $form->select('gift_sku_id')->options(function ($id) {
                $sku = ProductSku::find($id);
                if ($sku) {
                    return [$sku->id => $sku->name];
                }
            })->ajax(admin_route('api.product_skus'))->required();
            $form->number('num')->min(1)->default(1);
            $form->number('limit')->min(0)->default(0);
        })->customFormat(function () use ($sku) {
            return $sku->gifts;
        });
        $this->hidden('sku_id')->value($id);
    }
}