fastadmin_tailored/application/common/Service/DiscountService.php

<?php

namespace app\common\Service;

use think\Db;
use think\Model;
use app\common\Enum\StatusEnum;
use app\common\Enum\ActivityEnum;
use app\common\Enum\GoodsEnum;
/**
 * 折扣活动服务类
 */
class DiscountService
{
    /**
     * 查询当前时间段内的商品折扣信息
     * @param array $goodsIds 商品ID数组，为空则查询所有参与折扣的商品
     * @param int $limit 限制数量
     * @return array
     */
    public static function getCurrentDiscountGoods($goodsIds = [], $limit = 0)
    {
        $currentTime = time();
        
        // 第一步：查询当前时间有效的活动ID
        $activeActivityIds = Db::table('shop_activity')
            ->where('start_time', '<=', $currentTime)
            ->where('end_time', '>=', $currentTime)
            ->where('activity_status', ActivityEnum::ACTIVITY_STATUS_ONGOING)
            ->where('status',  StatusEnum::ENABLED)
            ->column('id');
        if (empty($activeActivityIds)) {
            return [];
        }
        
        // 第二步：查询这些活动的SKU数据
        $query = Db::table('shop_activity_sku')
            ->alias('sku')
            ->join('shop_goods goods', 'sku.goods_id = goods.id')
            ->join('shop_goods_sku spec', 'sku.sku_id = spec.id', 'left')
            ->join(['shop_activity'=> 'activity'], 'sku.activity_id = activity.id')
            ->where('sku.activity_id', 'in', $activeActivityIds)
            ->where('goods.status', GoodsEnum::STATUS_ON_SALE) // 已上架的商品
            ->where('sku.stocks', '>', 0) // 有折扣库存的商品
            ->field([
                'goods.id as goods_id',
                'goods.title',
                'goods.sub_title',
                'goods.image',
                'goods.price as original_price',
                'goods.market_price',
                'goods.stocks as goods_stocks',
                'goods.sales',
                'goods.spec_type',
                'sku.id as activity_sku_id',
                'sku.sku_id',
                'sku.discount',
                'sku.discount_price',
                'sku.stocks as discount_stocks',
                'sku.sale_quantity',
                'activity.id as activity_id',
                'activity.name as activity_name',
                'activity.start_time',
                'activity.end_time',
                'spec.price as sku_price',
                'spec.image as sku_image',
                // 'spec.specs as sku_specs'
            ]);
        
        // 如果指定了商品ID，则添加条件
        if (!empty($goodsIds)) {
            $query->where('sku.goods_id', 'in', $goodsIds);
        }
        
        // 如果设置了限制数量
        if ($limit > 0) {
            $query->limit($limit);
        }
        
        // 按折扣力度排序，折扣越大越靠前
        $query->order('sku.discount', 'asc');
        
        $result = $query->select();
        // 处理返回数据
        $processedData = [];
        foreach ($result as $item) {
            $goodsId = $item['goods_id'];
            $skuId = $item['sku_id'];
            
            // 如果商品还没有在结果中，初始化
            if (!isset($processedData[$goodsId])) {
                $processedData[$goodsId] = [
                    'goods_id' => $goodsId,
                    'title' => $item['title'],
                    'sub_title' => $item['sub_title'],
                    'image' => $item['image'],
                    'original_price' => $item['original_price'],
                    'market_price' => $item['market_price'],
                    'goods_stocks' => $item['goods_stocks'],
                    'sales' => $item['sales'],
                    'spec_type' => $item['spec_type'],
                    'activity_id' => $item['activity_id'],
                    'activity_name' => $item['activity_name'],
                    'start_time' => $item['start_time'],
                    'end_time' => $item['end_time'],
                    'discount_info' => []
                ];
            }
            
            // 添加折扣信息
            $discountInfo = [
                'activity_sku_id' => $item['activity_sku_id'],
                'sku_id' => $skuId,
                'discount' => $item['discount'],
                'discount_price' => $item['discount_price'],
                'discount_stocks' => $item['discount_stocks'],
                'sale_quantity' => $item['sale_quantity']
            ];
            
            // 如果是多规格商品，添加规格信息
            if ($skuId > 0) {
                $discountInfo['sku_price'] = $item['sku_price'];
                $discountInfo['sku_image'] = $item['sku_image'];
                // $discountInfo['sku_specs'] = $item['sku_specs'];
            }
            
            $processedData[$goodsId]['discount_info'][] = $discountInfo;
        }
        
        return array_values($processedData);
    }
    
    /**
     * 根据商品ID和SKU ID获取折扣信息
     * @param int $goodsId 商品ID
     * @param int $skuId SKU ID，单规格商品传0
     * @return array|null
     */
    public static function getGoodsDiscountInfo($goodsId, $skuId = 0)
    {
        $currentTime = time();
        
        // 第一步：查询当前时间有效的活动ID
        $activeActivityIds = Db::table('shop_activity')
            ->where('start_time', '<=', $currentTime)
            ->where('end_time', '>=', $currentTime)
            ->where('activity_status', ActivityEnum::ACTIVITY_STATUS_ONGOING)
            ->where('status', 'normal')
            ->column('id');
        
        if (empty($activeActivityIds)) {
            return null;
        }
        
        // 第二步：查询指定商品的折扣信息
        $discountInfo = Db::table('shop_activity_sku_prize')
            ->alias('sku')
            ->join('shop_activity activity', 'sku.activity_id = activity.id')
            ->where('sku.goods_id', $goodsId)
            ->where('sku.sku_id', $skuId)
            ->where('sku.activity_id', 'in', $activeActivityIds)
            ->where('sku.status', 1)
            ->where('sku.stocks', '>', 0)
            ->field([
                'sku.id as activity_sku_id',
                'sku.discount',
                'sku.discount_price',
                'sku.stocks as discount_stocks',
                'sku.sale_quantity',
                'activity.id as activity_id',
                'activity.name as activity_name',
                'activity.start_time',
                'activity.end_time'
            ])
            ->find();
        
        return $discountInfo ?: null;
    }
    
    /**
     * 批量获取商品的折扣信息
     * @param array $goodsIds 商品ID数组
     * @return array 键为商品ID，值为折扣信息数组
     */
    public static function getBatchGoodsDiscountInfo($goodsIds)
    {
        if (empty($goodsIds)) {
            return [];
        }
        
        $currentTime = time();
        
        // 第一步：查询当前时间有效的活动ID
        $activeActivityIds = Db::table('shop_activity')
            ->where('start_time', '<=', $currentTime)
            ->where('end_time', '>=', $currentTime)
            ->where('activity_status', ActivityEnum::ACTIVITY_STATUS_ONGOING)
            ->where('status', 'normal')
            ->column('id');
        
        if (empty($activeActivityIds)) {
            return [];
        }
        
        // 第二步：查询指定商品的折扣信息
        $result = Db::table('shop_activity_sku_prize')
            ->alias('sku')
            ->join('shop_activity activity', 'sku.activity_id = activity.id')
            ->where('sku.goods_id', 'in', $goodsIds)
            ->where('sku.activity_id', 'in', $activeActivityIds)
            ->where('sku.status', 1)
            ->where('sku.stocks', '>', 0)
            ->field([
                'sku.goods_id',
                'sku.sku_id',
                'sku.id as activity_sku_id',
                'sku.discount',
                'sku.discount_price',
                'sku.stocks as discount_stocks',
                'sku.sale_quantity',
                'activity.id as activity_id',
                'activity.name as activity_name'
            ])
            ->order('sku.discount', 'asc')
            ->select();
        
        // 按商品ID分组
        $discountData = [];
        foreach ($result as $item) {
            $goodsId = $item['goods_id'];
            if (!isset($discountData[$goodsId])) {
                $discountData[$goodsId] = [];
            }
            $discountData[$goodsId][] = $item;
        }
        
        return $discountData;
    }
    
    /**
     * 检查商品是否参与当前折扣活动
     * @param int $goodsId 商品ID
     * @param int $skuId SKU ID
     * @return bool
     */
    public static function hasActiveDiscount($goodsId, $skuId = 0)
    {
        $discountInfo = self::getGoodsDiscountInfo($goodsId, $skuId);
        return !empty($discountInfo);
    }
    
    /**
     * 计算折扣后的价格
     * @param float $originalPrice 原价
     * @param float $discount 折扣（如9.0表示9折）
     * @return float
     */
    public static function calculateDiscountPrice($originalPrice, $discount)
    {
        return round($originalPrice * $discount / 10, 2);
    }
    
    /**
     * 获取活动剩余时间（秒）
     * @param int $endTime 活动结束时间戳
     * @return int
     */
    public static function getActivityRemainingTime($endTime)
    {
        return max(0, $endTime - time());
    }
    
    /**
     * 格式化活动剩余时间
     * @param int $endTime 活动结束时间戳
     * @return array
     */
    public static function formatRemainingTime($endTime)
    {
        $remaining = self::getActivityRemainingTime($endTime);
        
        if ($remaining <= 0) {
            return ['days' => 0, 'hours' => 0, 'minutes' => 0, 'seconds' => 0];
        }
        
        $days = floor($remaining / 86400);
        $hours = floor(($remaining % 86400) / 3600);
        $minutes = floor(($remaining % 3600) / 60);
        $seconds = $remaining % 60;
        
        return [
            'days' => $days,
            'hours' => $hours,
            'minutes' => $minutes,
            'seconds' => $seconds
        ];
    }
}