<?php

namespace App\Admin\Forms;

use App\Exceptions\BizException;
use App\Models\Order;
use App\Models\OrderPackage;
use App\Models\OrderPackageProduct;
use Dcat\Admin\Contracts\LazyRenderable;
use Dcat\Admin\Traits\LazyWidget;
use Dcat\Admin\Widgets\Form;
use Illuminate\Support\Facades\DB;
use Throwable;

class OrderPackageEdit extends Form implements LazyRenderable
{
    use LazyWidget;

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

    /**
     * Handle the form request.
     *
     * @param array $input
     *
     * @return mixed
     */
    public function handle(array $input)
    {
        $id = $this->payload['id'] ?? 0;
        $packageProductId = $input['package_product_id'];
        $quantity = $input['quantity'] ?? 0;

        $orderPackage = OrderPackage::with('order')->findOrFail($id);
        //修改的数量不能大于当前数量，只能变小
        $packageProduct = OrderPackageProduct::findOrFail($packageProductId);
        if ($quantity == 0) {
            throw new BizException('修改的数量不能为0');
        }
        if ($packageProduct->quantity <= $quantity) {
            throw new BizException('修改的数量不能大于等于当前数量');
        }
        try {
            DB::beginTransaction();
            //更新当前包裹这个商品数量；
            $packageProduct->update([
                'quantity'=>$quantity,
            ]);
            //回滚对应订单商品待发货数量；
            $packageProduct->orderProduct->increment('remain_quantity', $packageProduct->quantity - $quantity);

            //如果订单是已确认收货状态，则回滚到发货中；
            if ($orderPackage->order->isCompleted()) {
                $orderPackage->order()->update([
                    'status'=>Order::STATUS_PAID,
                    'shipping_state'=>Order::SHIPPING_STATE_PROCESSING,
                    'completed_at'=>null,
                ]);
            }

            DB::commit();
        } catch (Throwable $th) {
            DB::rollBack();
            report($th);
            return $this->response()->error('操作失败：'.$th->getMessage());
        }

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

    /**
     * Build a form here.
     */
    public function form()
    {
        $id = $this->payload['id'] ?? 0;
        $this->select('package_product_id', '包裹商品')
            ->options(OrderPackageProduct::with('orderProduct')->where('order_package_id', $id)->get()->pluck('orderProduct.name', 'id'))
            ->required();
        $this->number('quantity', '发货数量')->default(1)->min(1)->required();
    }
}