<?php

namespace App\Admin\Forms;

use App\Models\Coupon;
use App\Models\ProductPart;
use App\Models\ProductPartCoupon;
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 PartCoupon 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_parts.coupons');
    }

    /**
     * Handle the form request.
     *
     * @param array $input
     *
     * @return mixed
     */
    public function handle(array $input)
    {
        $couponIds = [];
        $coupons = [];
        $delCouponIds = [];
        foreach ($input['coupons'] as $coupon) {
            if ($coupon['_remove_'] == 1) {
                $delCouponIds[] = $coupon['id'];
            } else {
                if (is_null($coupon['id'])) {
                    $coupons[] = new ProductPartCoupon($coupon);
                } else {
                    $_coupon = ProductPartCoupon::find($coupon['id']);
                    $_coupon->coupon_id = $coupon['coupon_id'];
                    $_coupon->num = $coupon['num'];

                    $coupons[] = $_coupon;
                }
            }
        }
        $partId = $input['part_id'];
        $part = ProductPart::findOrFail($partId);

        try {
            DB::beginTransaction();
            $part->coupons()->saveMany($coupons);

            ProductPartCoupon::whereIn('id', $delCouponIds)->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;
        $part = ProductPart::with('coupons')->findOrFail($id);

        $this->hasMany('coupons', function (NestedForm $form) {
            $form->select('coupon_id')->options(function ($id) {
                $coupon = Coupon::find($id);
                if ($coupon) {
                    return [$coupon->id => $coupon->name];
                }
            })->ajax(admin_route('api.coupons'))->required();
            $form->number('num')->min(1)->default(1);
        })->customFormat(function () use ($part) {
            return $part->coupons;
        });
        $this->hidden('part_id')->value($id);
    }
}