<?php
# 关系类

namespace Invite\Lib;

use Dever;

class Relation
{
	# 只记录6级关系
	private $total = 6;

    # 通用的邀请方法：
    # uid 当前用户的上级，需要通过code邀请码来得到
    # to_uid 被邀请人，当前登录用户，注册后得到
    public function set($uid, $to_uid)
    {
        $this->setParent($uid, $to_uid);
        $this->add($uid, $to_uid, 1);

        return true;
    }

    public function setParent($uid, $to_uid, $level = 1)
    {
        $parent = $this->getParent($uid);
        if ($parent) {
            $level = $level + 1;
            if ($level > $this->total) {
                return;
            }
            $this->add($parent['uid'], $to_uid, $level);
            $this->setParent($parent['uid'], $to_uid, $level);
        }
    }

    # 获取某个用户的上级数据
    public function getParent($uid, $level = 1)
    {
        return Dever::db('invite/relation')->one(array('to_uid' => $uid, 'level' => $level));
    }

    # 获取某个用户的下级数据
    public function getChild($uid, $level = false)
    {
        if (!$level) {
            $level = $this->level;
        }
        return Dever::db('invite/relation')->getChild(array('uid' => $uid, 'level' => $level));
    }

    # 插入数据
    public function add($uid, $to_uid, $level = 1)
    {   
        $data['uid'] = $uid;
        $data['to_uid'] = $to_uid;
        $data['level'] = $level;

        $info = Dever::db('invite/relation')->one($data);

        if (!$info) {
            $result = Dever::db('invite/relation')->insert($data);
        }
        
        return true;
    }
}