BaoMa/app/Models/UserCoupon.php

<?php
/**
 * Created by PhpStorm.
 * User: zilongs
 * Date: 20-9-30
 * Time: 下午11:25
 */

namespace App\Models;

class UserCoupon extends BaseModel
{
    public static function getDiscountAmount($id, $user_id, $total_amount, $product_type)
    {
        $userCoupon = self::where('id', $id)->where('user_id', $user_id)->first();
        if (empty($userCoupon)) {
            exit_out(null, 10001, '用户优惠券不存在');
        }
        if ($userCoupon['status'] == 2) {
            exit_out(null, 10002, '该优惠券已被使用，请勿重复使用');
        }
        if ($userCoupon['status'] == 3) {
            exit_out(null, 10003, '该优惠券已过期');
        }
        if ($userCoupon['status'] == 1) {
            if ($userCoupon['expire_type'] == 1) {
                $expire_time = strtotime($userCoupon['created_at']) + $userCoupon['effective_days']*24*3600;
            }
            else {
                $expire_time = $userCoupon['end_time'];
            }
            if ($expire_time < time()) {
                self::where('id', $id)->update(['status' => 3]);
                exit_out(null, 10004, '该优惠券已过期');
            }

            if ($userCoupon['min_consume_amount'] > $total_amount) {
                exit_out(null, 10005, '未达到该优惠券的最低消费金额');
            }

            if ($userCoupon['usable_type'] == 2 && !CouponType::where('user_coupon_id', $id)->where('product_type', $product_type)->count()) {
                exit_out(null, 10006, '该优惠券不支持该类型的订单');
            }
        }

        if ($userCoupon['type'] == 1) {
            $discountAmount = $userCoupon['money'];
        }
        else {
            $discountAmount = floor((1 - $userCoupon['discount']/10)*$total_amount);
            $discountAmount = $userCoupon['max_reduce_amount'] < $discountAmount ? $userCoupon['max_reduce_amount'] : $discountAmount;
        }

        return $discountAmount;
    }
}