<?php

namespace App\Admin\Repositories;

use App\Models\Coupon as Model;
use Dcat\Admin\Form;
use Dcat\Admin\Repositories\EloquentRepository;
use Illuminate\Support\Arr;
use Illuminate\Support\Facades\DB;

class Coupon extends EloquentRepository
{
    /**
     * Model.
     *
     * @var string
     */
    protected $eloquentClass = Model::class;

    /**
     * 新增记录.
     *
     * @param  Form  $form
     * @return mixed
     */
    public function store(Form $form)
    {
        $result = null;

        DB::transaction(function () use ($form, &$result) {
            $model = $this->model();

            $updates = $form->updates();

            [$relations, $relationKeyMap] = $this->getRelationInputs($model, $updates);

            if ($relations) {
                $updates = Arr::except($updates, array_keys($relationKeyMap));
            }

            foreach ($updates as $column => $value) {
                $model->setAttribute($column, $value);
            }
            //处理剩余量字段
            $model = $this->createStock($model);

            $result = $model->save();

            $this->updateRelation($form, $model, $relations, $relationKeyMap);
        });

        return $this->model()->getKey();
    }

    /**
     * 更新数据.
     *
     * @param  Form  $form
     * @return bool
     */
    public function update(Form $form)
    {
        /* @var EloquentModel $builder */
        $model = $this->model();

        if (! $model->getKey()) {
            $model->exists = true;

            $model->setAttribute($model->getKeyName(), $form->getKey());
        }

        $result = null;

        DB::transaction(function () use ($form, $model, &$result) {
            $updates = $form->updates();

            [$relations, $relationKeyMap] = $this->getRelationInputs($model, $updates);

            if ($relations) {
                $updates = Arr::except($updates, array_keys($relationKeyMap));
            }

            foreach ($updates as $column => $value) {
                /* @var EloquentModel $model */
                $model->setAttribute($column, $value);
            }
            $model = $this->createStock($model);
            $result = $model->update();

            $this->updateRelation($form, $model, $relations, $relationKeyMap);
        });

        return $result;
    }

    /**
     * Undocumented function
     *
     * @return void
     */
    public function createStock($model)
    {
        if ($model->limit == 0) {
            $model->setAttribute('stock', 0);
        } else {
            $model->setAttribute('stock', $model->limit - $model->sent);
        }
        return $model;
    }
}