<?php

namespace common\services;

use Yii;
use common\models\xhCart;
use common\cacheModels\shoppingCartCache;
use common\components\dict;

class xhCartService
{
	/**
	 * 增加一个商品
	 */
	public static function add($userId, $goodsId, $data)
	{
		//增加了多价格选项时的变动
		if (isset($data['multiPriceId']) && is_numeric($data['multiPriceId']) && !empty($data['multiPriceId'])) {
			$multiPriceId = $data['multiPriceId'];
			$goodsPrice = xhGoodsPriceService::getById($multiPriceId);
			if (empty($goodsPrice)) {
				throw new \Exception('多规格ID：' . $multiPriceId . '不存在');
			}
			$data['goodsPriceId'] = $multiPriceId;
		}
		unset($data['multiPriceId']);
		unset($data['isMultiPrice']);
		$return = xhCart::add($data);
		return $return;
	}
	
	/**
	 * 增加或修改商品记录
	 */
	public static function replace($userId, $goodsId, $data)
	{
		$data['goodsPriceId'] = 0;
		if (isset($data['multiPriceId'])) {
			$multiPriceId = $data['multiPriceId'];
		} else {
			$multiPriceId = 0;
		}
		$cart = self::getByIds($userId, $goodsId, $multiPriceId);
		if (empty($cart)) {
			return self::add($userId, $goodsId, $data);
		}
		
		$id = $cart['id'];
		if (isset($data['multiPriceId']) && is_numeric($data['multiPriceId']) && !empty($data['multiPriceId'])) {
			$goodsPrice = xhGoodsPriceService::getById($data['multiPriceId']);
			if (empty($goodsPrice)) {//校验 multiPriceId 是否存在
				throw new \Exception('xhCartService：商品多种价格ID不存在');
			}
			$data['goodsPriceId'] = $data['multiPriceId'];
		}
		unset($data['multiPriceId']);
		unset($data['isMultiPrice']);
		self::updateById($id, $goodsId, $userId, $data);
	}
	
	
	/**
	 * 删除购物车里每个商品的详细，同时删除购物车list的相应记录
	 */
	public static function delByIds($userId, $goodsId, $goodsPriceId, $cartId = 0)
	{
		if ($cartId == 0) {
			$cart = xhCartService::getByIds($userId, $goodsId, $goodsPriceId);
			$cartId = $cart['id'];
		}
		$delResult = xhCart::deleteByCondition(['userId' => $userId, 'goodsId' => $goodsId, 'goodsPriceId' => $goodsPriceId]);
		if (!$delResult) {
			return false;
		}
		
		$cacheKey = $userId . dict::getCacheKey('cart') . $goodsId . '_' . $goodsPriceId;//xhCart表的缓存键
		Yii::$app->redis->executeCommand('DEL', [$cacheKey]);//删除一个商品的缓存
		shoppingCartCache::delUserCart($userId, $goodsId, $goodsPriceId);//删除用户购物车里的商品
	}
	
	/**
	 * 获取用户的购物车商品数据，含有商品信息
	 */
	public static function getUserCartList($userId)
	{
		$arr = xhCart::getAllByCondition(['userId' => $userId]);
		$list = [];
		if (empty($arr)) {
			return $list;
		}
		foreach ($arr as $val) {
			$goodId = $val['goodsId'];
			$num = $val['num'];
			$multiPriceId = $val['goodsPriceId'];
			$goods = xhGoodsService::getById($goodId);
			$price = 0;
			if (!empty($goods)) {
				$price = $goods['price'];

				//商品封面小图标 ssh 2019.8.3
				$url = $goods['cover'];
				$pos = strrpos($url, '.');
				$pre = substr($url, 0, $pos);
				$ext = substr($url, ($pos + 1));
				$goods['middleCover'] = $pre . '_200.' . $ext;
			}
			$standardName = '';//规格名称
			if (!empty($multiPriceId)) {
				$goodsPrice = xhGoodsPriceService::getById($multiPriceId);
				if (!empty($goodsPrice)) {
					$price = $goodsPrice['price'];
					$standardName = $goodsPrice['title'];
				}
			}
			$list[] = ['goodsInfo' => $goods, 'num' => $num, 'multiPriceId' => $multiPriceId, 'price' => $price,
				'selected' => 0,//用于小程序上标识是否选中 0未选中 1选中
				'standardName' => $standardName];
		}
		return $list;
	}
	
	//修改商品记录(表数据 与 缓存)
	public static function updateById($cartId, $goodsId, $userId, $data)
	{
		$num = $data['num'];
		if (!is_numeric($num) || $num <= 0) {
			throw new \Exception('xhCartService addOneUserCart Error: param $data["num"] error');
		}
		
		$cart = self::getByIds($userId, $goodsId, $data['goodsPriceId']);
		$data['num'] += $cart['num'];
		xhCart::updateById($cartId, $data);//更新数据库
		$cacheKey = $userId . dict::getCacheKey('cart') . $goodsId . '_' . $cart['goodsPriceId'];//购物车表（xhCart）的缓存键
		$params = [$cacheKey];
		foreach ($data as $key => $val) {
			$params[] = $key;
			$params[] = $val;
		}
		Yii::$app->redis->executeCommand('HMSET', $params);//更新一个商品的缓存
		$goodsPriceId = $data['goodsPriceId'];
		shoppingCartCache::updateUserCart($userId, $goodsId, $goodsPriceId, $num);//更新用户购物车里的商品
	}
	
	/**
	 * 获取购物车表（xhCart）商品缓存
	 * @param int $userId
	 * @param int $goodsId
	 */
	public static function getByIds($userId, $goodsId, $goodsPriceId = 0)
	{
		$cacheKey = $userId . dict::getCacheKey('cart') . $goodsId . '_' . $goodsPriceId;//购物车表（xhCart）的缓存键
		$cart = Yii::$app->redis->executeCommand('HGETALL', [$cacheKey]);
		if (!empty($cart)) {
			$arr = [];
			$i = 0;
			$x = 0;
			foreach ($cart as $key => $val) {
				$i++;
				if ($i % 2 == 0) {
					$arr[$x]['value'] = $val;
					$x++;
				} else {
					$arr[$x]['key'] = $val;
				}
			}
			$cartArr = [];
			foreach ($arr as $key => $val) {
				$cartArr[$val['key']] = $val['value'];
			}
			unset($cartArr['info_already_get_by_sql']);
			return $cartArr;
		}
		$cart = xhCart::getByCondition(['goodsId' => $goodsId, 'userId' => $userId, 'goodsPriceId' => $goodsPriceId]);
		$params = [$cacheKey];
		$params[] = 'info_already_get_by_sql';
		$params[] = 'ok';//redis没有办法设置带空值的键，加此可以数据空时表示取过
		if (!empty($cart)) {
			foreach ($cart as $key => $val) {
				$params[] = $key;
				$params[] = $val;
			}
		}
		Yii::$app->redis->executeCommand('HMSET', $params);
		return $cart;
	}
	
	public static function refresh($userId, $goodsId, $goodsPriceId = 0)
	{
		$cacheKey = $userId . dict::getCacheKey('cart') . $goodsId . '_' . $goodsPriceId;//购物车表（xhCart）的缓存键
		Yii::$app->redis->executeCommand('DEL', [$cacheKey]);
		self::getByIds($goodsId, $userId, $goodsPriceId);//添加一个商品的缓存
	}
	
}