<?php

namespace App\Backend;

use App\Entities\OrderEntity;
use App\Models\OrderModel;
use App\Models\ProductModel;

class OrderBackend extends BaseBackend
{
    private $_productModel = null;
    private $_product_uids = array();
    public function __construct()
    {
        parent::__construct('Order');
        $this->_model = new OrderModel();
    }

    //Porduct모델
    final public function getProductModel(): ProductModel
    {
        return is_null($this->_productModel) ? new ProductModel() : $this->_productModel;
    }

    //Field별 Form Option용
    public function getFieldFormOption(string $field): array
    {
        switch ($field) {
            case 'product_uid':
                $options = $this->_product_uids = $this->_product_uids ?: $this->getProductModel()->getFieldFormOptions([]);
                break;
            default:
                return parent::getFieldFormOption($field);
                break;
        }
        if (!is_array($options)) {
            throw new \Exception(__FUNCTION__ . "에서 {$this->getClassName()}의 Field:{$field}의 FormOptionData가 array가 아닙니다.\n" . var_export($options, true));
        }
        return $options;
    }

    //Insert관련 //장바구니에 담기 및 Product 재고 차감
    public function insert(array $fieldDatas): OrderEntity
    {
        //상품정보가져오기
        $product = $this->getProductModel()->getEntity([$this->getProductModel()->getPrimaryKey() => $fieldDatas['product_uid']]);
        if (!$fieldDatas['quantity']) {
            throw new \Exception("제품 구매수량을 확인해주세요");
        }
        if (!$fieldDatas['price']) {
            throw new \Exception("제품 구매금액을 확인해주세요");
        }
        if ($product->getStock() < $fieldDatas['quantity']) {
            throw new \Exception(sprintf(
                "%s의 재고수[%s]보다 많은 수량[%s]을 주문하셨습니다.\\n",
                $product->getTitle(),
                $product->getStock(),
                $fieldDatas['quantity']
            ));
        }
        //구매금액 = (판매가-할인가)*구매수량과 맞는지 다시 확인.
        // $calculated_price = ($product->getPrice() - $product->getSale()) * $quantity;
        $calculated_price = ($product->getPrice() - $product->getSale()) * $fieldDatas['quantity'];
        if ($fieldDatas['price'] != $calculated_price) {
            throw new \Exception(
                sprintf(
                    "%s상품의 구매금액[%s원]과 판매금액[%s원]이 맞지않습니다.",
                    $product->getTitle(),
                    number_format($fieldDatas['price']),
                    number_format($calculated_price)
                )
            );
        }
        //상품모델에서 Order에 담은 갯수만큼 재고에서 뺀다.
        $this->getProductModel()->decreaseStock($product, $fieldDatas['quantity']);
        return parent::insert($fieldDatas);
    }
}