<?php

namespace app\common\model;

use think\Model;

class Cart extends Model {

    /**
     * 购物车商品总金额
     */
    private $cart_all_price = 0;

    /**
     * 购物车商品总数
     */
    private $cart_goods_num = 0;


    /**
     * 取属性值魔术方法
     * @access public
     * @author csdeshang 
     * @param type $name 名称
     * @return type
     */
    public function __get($name) {
        return $this->$name;
    }

    /**
     * 检查购物车内商品是否存在
     * @access public
     * @author csdeshang 
     * @param array $condition 检索条件
     * @return bool
     */
    public function checkCart($condition = array()) {
        return db('cart')->where($condition)->find();
    }

    /**
     * 会员购物车内商品数 
     * @access public
     * @author csdeshang 
     * @param int $memberId 会员ID
     * @return int
     */
    public function getCartCountByMemberId($memberId) {
        $memberId = intval($memberId);
        return db('cart')->where(array('buyer_id' => $memberId,))->count();
    }

    /**
     * 取得 单条购物车信息
     * @access public
     * @author csdeshang  
     * @param array $condition 检索条件
     * @param string $field 字段
     * @return array
     */
    public function getCartInfo($condition = array(), $field = '*') {
        return db('cart')->field($field)->where($condition)->find();
    }

    /**
     * 将商品添加到购物车中
     * @access public
     * @author csdeshang
     * @param array	$data	商品数据信息
     * @param string $save_type 保存类型，可选值 db,cookie
     * @param int $quantity 购物数量
     * @return type
     */
    public function addCart($data = array(), $save_type = '', $quantity = null) {
        $method = '_addCart' . ucfirst($save_type);
        $result = $this->$method($data, $quantity);
        if(!$result){
            return false;
        }
        //更改购物车总商品数和总金额，传递数组参数只是给DB使用
        $this->getCartNum($save_type, array('buyer_id' => isset($data['buyer_id'])?$data['buyer_id']:0));
        return $result;
    }

    /**
     * 添加数据库购物车
     * @access public
     * @author csdeshang
     * @param array $goods_info 商品信息
     * @param int $quantity 购物数量
     * @return type
     */
    private function _addCartDb($goods_info = array(), $quantity) {
        //验证购物车商品是否已经存在
        $condition = array();
        $condition['goods_id'] = $goods_info['goods_id'];
        $condition['buyer_id'] = $goods_info['buyer_id'];
        if (isset($goods_info['bl_id'])) {
            $condition['bl_id'] = $goods_info['bl_id'];
        } else {
            $condition['bl_id'] = 0;
        }
        //如果购物车
        $check_cart = $this->checkCart($condition);
        
        if (!empty($check_cart)) {
            if($quantity != $check_cart['goods_num']){
                if($quantity>$goods_info['goods_storage']){
                    $this->error_code = 10001;
                    $this->error_message = '库存不足';
                    return false;
                }
                //如果商品存在则更新数量
                return db('cart')->where($condition)->update(array('goods_num'=>$quantity));
            }else{
                return 1;
            }
        } else {
            //如果商品存在则插入
            $array = array();
            $array['buyer_id'] = $goods_info['buyer_id'];
            $array['goods_id'] = $goods_info['goods_id'];
            $array['goods_name'] = $goods_info['goods_name'];
            $array['goods_price'] = $goods_info['goods_price'];
            $array['goods_num'] = $quantity;
            $array['goods_image'] = $goods_info['goods_image'];
            $array['bl_id'] = isset($goods_info['bl_id']) ? $goods_info['bl_id'] : 0;
            return db('cart')->insertGetId($array);
        }
            

        
    }

    /**
     * 添加到cookie购物车,最多保存5个商品
     * @access public
     * @author csdeshang
     * @param array $goods_info 商品信息
     * @param int $quantity 购物数量
     * @return bool
     */
    private function _addCartCookie($goods_info = array(), $quantity = null) {
        //去除斜杠
        $cart_str = get_magic_quotes_gpc() ? stripslashes(cookie('cart')) : cookie('cart');
        $cart_str = base64_decode(ds_decrypt($cart_str));
        $cart_array = @unserialize($cart_str);
        $cart_array = !is_array($cart_array) ? array() : $cart_array;
        if (count($cart_array) >= 5)
            return false;

        if (in_array($goods_info['goods_id'], array_keys($cart_array))) {
            //如果购物车存在则更新数量
            $cart_array[$goods_info['goods_id']] = array(
                'goods_id' => $goods_info['goods_id'],
                'goods_name' => $goods_info['goods_name'],
                'goods_price' => $goods_info['goods_price'],
                'goods_image' => $goods_info['goods_image'],
                'goods_num' => $cart_array[$goods_info['goods_id']]['goods_num']+$quantity
            );
            cookie('cart', ds_encrypt(base64_encode(serialize($cart_array))), 24 * 3600);
            return true;
        } else {
            $cart_array[$goods_info['goods_id']] = array(
                'goods_id' => $goods_info['goods_id'],
                'goods_name' => $goods_info['goods_name'],
                'goods_price' => $goods_info['goods_price'],
                'goods_image' => $goods_info['goods_image'],
                'goods_num' => $quantity
            );
            cookie('cart', ds_encrypt(base64_encode(serialize($cart_array))), 24 * 3600);
            return true;
        }
            
        
    }

    /**
     * 更新购物车
     * @access public
     * @author csdeshang
     * @param	array	$data 商品信息
     * @param	array	$condition 检索条件
     * @return bool
     */
    public function editCart($data, $condition) {
        $result = db('cart')->where($condition)->update($data);
        if ($result) {
            $this->getCartNum('db', array('buyer_id' => $condition['buyer_id']));
        }
        return $result;
    }

    /**
     * 购物车列表
     * @access public
     * @author csdeshang
     * @param string $type 存储类型 db,cookie
     * @param array $condition 检索条件
     * @param int $limit 限制
     * @return array
     */
    public function getCartList($type, $condition = array(), $limit = '') {
        if ($type == 'db') {
            $cart_list = db('cart')->where($condition)->limit($limit)->select();
        } elseif ($type == 'cookie') {
            //去除斜杠
            $cart_str = get_magic_quotes_gpc() ? stripslashes(cookie('cart')) : cookie('cart');
            $cart_str = base64_decode(ds_decrypt($cart_str));
            $cart_list = @unserialize($cart_str);
        }
        $cart_list = is_array($cart_list) ? $cart_list : array();
        //顺便设置购物车商品数和总金额
        $this->cart_goods_num = count($cart_list);
        $cart_all_price = 0;
        if (is_array($cart_list)) {
            foreach ($cart_list as $val) {
                $cart_all_price += $val['goods_price'] * $val['goods_num'];
            }
        }
        $this->cart_all_price = ds_price_format($cart_all_price);
        return !is_array($cart_list) ? array() : $cart_list;
    }

    /**
     * 删除购物车商品
     * @access public
     * @author csdeshang
     * @param string $type 存储类型 db,cookie
     * @param array $condition 检索条件
     * @return bool
     */
    public function delCart($type, $condition = array()) {
        if ($type == 'db') {
            $result = db('cart')->where($condition)->delete();
        } elseif ($type == 'cookie') {
            $cart_str = get_magic_quotes_gpc() ? stripslashes(cookie('cart')) : cookie('cart');
            $cart_str = base64_decode(ds_decrypt($cart_str));
            $cart_array = @unserialize($cart_str);
            if (key_exists($condition['goods_id'], (array) $cart_array)) {
                unset($cart_array[$condition['goods_id']]);
            }
            cookie('cart', ds_encrypt(base64_encode(serialize($cart_array))), 24 * 3600);
            $result = true;
        }
        //重新计算购物车商品数和总金额
        if ($result) {
            $this->getCartNum($type, array('buyer_id' => isset($condition['buyer_id'])?$condition['buyer_id']:0));
        }
        return $result;
    }

    /**
     * 清空购物车
     * @access public
     * @author csdeshang 
     * @param string $type 存储类型 db,cookie
     * @param array $condition 检索条件
     * @return bool
     */
    public function clearCart($type, $condition = array()) {
        if ($type == 'cookie') {
			//登录后清空cookie中保存的商品信息
			cookie('goods_cart',NULL);
            cookie('cart_count',NULL);
            cookie('cart', NULL);
        } else if ($type == 'db') {
            //数据库暂无浅清空操作
        }
    }

    /**
     * 计算购物车总商品数和总金额
     * @access public
     * @author csdeshang 
     * @param string $type 购物车信息保存类型 db,cookie
     * @param array $condition 只有登录后操作购物车表时才会用到该参数
     * @return type
     */
    public function getCartNum($type, $condition = array()) {
        if ($type == 'db') {
            $cart_all_price = 0;
            $cart_goods = $this->getCartList('db', $condition);
            $this->cart_goods_num = count($cart_goods);
            if (!empty($cart_goods) && is_array($cart_goods)) {
                foreach ($cart_goods as $val) {
                    $cart_all_price += $val['goods_price'] * $val['goods_num'];
                }
            }
            $this->cart_all_price = ds_price_format($cart_all_price);
        } elseif ($type == 'cookie') {
            $cart_str = get_magic_quotes_gpc() ? stripslashes(cookie('cart')) : cookie('cart');
            $cart_str = base64_decode(ds_decrypt($cart_str));
            $cart_array = @unserialize($cart_str);
            $cart_array = !is_array($cart_array) ? array() : $cart_array;
            $this->cart_goods_num = count($cart_array);
            $cart_all_price = 0;
            foreach ($cart_array as $v) {
                $cart_all_price += floatval($v['goods_price']) * intval($v['goods_num']);
            }
            $this->cart_all_price = $cart_all_price;
        }
        @cookie('cart_goods_num', $this->cart_goods_num, 2 * 3600);
        return $this->cart_goods_num;
    }

    /**
     * 登录之后,把登录前购物车内的商品加到购物车表
     * @access public
     * @author csdeshang 
     * @param array $member_info 会员信息
     * @return type
     */
    public function mergeCart($member_info = array()) {
        if (!$member_info['member_id'])
            return;
        // $save_type = config('cache.type') != 'file' ? 'cache' : 'cookie';
        $save_type = 'cookie';
        $cart_new_list = $this->getCartList($save_type);
        if (empty($cart_new_list))
            return;

        //取出当前DB购物车已有信息
        $cart_cur_list = $this->getCartList('db', array('buyer_id' => $member_info['member_id']));

        //数据库购物车已经有的商品，不再添加
        if (!empty($cart_cur_list) && is_array($cart_cur_list) && is_array($cart_new_list)) {
            foreach ($cart_new_list as $k => $v) {
                if (!is_numeric($k) || in_array($k, array_keys($cart_cur_list))) {
                    unset($cart_new_list[$k]);
                }
            }
        }

        //查询在购物车中,不是店铺自己的商品，未禁售，上架，有库存的商品,并加入DB购物车
        $goods_model = model('goods');
        $condition = array();
        $condition['goods_id'] = array('in', array_keys($cart_new_list));
        $goods_list = $goods_model->getGoodsOnlineList($condition);
        if (!empty($goods_list)) {
            foreach ($goods_list as $goods_info) {
                $goods_info['buyer_id'] = $member_info['member_id'];
                $this->addCart($goods_info, 'db', $cart_new_list[$goods_info['goods_id']]['goods_num']);
            }
        }
        //最后清空登录前购物车内容
        $this->clearCart($save_type);
    }

}

?>
