<?php
/**
 * Created by PhpStorm.
 * User: Elton
 * Date: 2020/4/23
 * Time: 13:58
 */

namespace app\common\service;


use app\common\library\Redis;
use app\main\constants\UserConstants;

class VipCpService
{

    public static $self;

    protected $cp_book_redis = UserConstants::USER_VIP_CP_BOOK;

    /**
     * @return VipCpService
     */
    public static function instance()
    {
        if(self::$self == NULL){
            self::$self = new self();
        }
        return self::$self;
    }

    public function getCpVipListModel(){
        return model('CpVipList');
    }


    /**
     * 判断书籍是否 VIP-CP书籍
     * @param $book_id
     * @return bool
     */
    public function isVipCpBook($book_id)
    {
        $redisKey = $this->cp_book_redis . $book_id;
        $data = false;
        if ($rst = Redis::instance()->get($redisKey)) {
            if ($rst == 1) {
                $data = true;
            }
        } else {
            $obj = $this->getCpVipListModel()->where('book_id', 'eq', $book_id)->find();
            if ($obj) {
                $this->saveCpRedis($book_id);
                $data = true;
            } else {
                $this->saveCpRedis($book_id, -1);
            }
        }
        return $data;
    }

    /**
     * 判断书籍是否CP书籍，对VIP收费
     * 如果是VIP，才能调用这个方法，其他用户调用无效
     * @param $book_id
     * @param $user_id
     * @param $vip_endtime
     * @return bool true => 免费 false=>收费
     */
    public function isFreeCpBookForVip($book_id, $user_id, $vip_endtime)
    {
        $rst = true;
        if ($vip_endtime < time()) {
            return false;
        }
        // 判断书籍是否是 VIP-CP
        if ($this->isVipCpBook($book_id)) {

            $cp_obj = $this->getCpVipListModel()->where('book_id', 'eq', $book_id)->find();
            $cp_createtime = $cp_obj['createtime'] ?? 0;

            // vip 扩展表中读取 vip_starttime
            if ($vip_starttime = UserVipExtendService::instance()->getVipStartTime($user_id)) {
                if ($vip_starttime > $cp_createtime) {
                    // 收费
                    $rst = false;
                }
            }
        }
        return $rst;
    }


    /**
     * @param $book_id
     * @param int $value
     */
    public function saveCpRedis($book_id, $value = 1)
    {
        Redis::instance()->set($this->cp_book_redis . $book_id, $value, 864000);
    }

    /**
     * @param $book_id
     */
    public function delCpRedis($book_id)
    {
        Redis::instance()->del($this->cp_book_redis . $book_id);
    }
}