<?php


namespace Yunshop\Redpack\model;


use Yunshop\Redpack\model\withdraw\Balance;
use Yunshop\Redpack\model\withdraw\Love;
use Yunshop\Redpack\model\withdraw\Point;
use Yunshop\Redpack\model\withdraw\Wechat;

class Redpack
{
    public function send($uid, $activityModel, $amount)
    {
        $rankingReward = [];
        if ($activityModel->withdraw_code == 1) {
            $rankingReward[] = [
                'type' => 'wechat_red_racket',
                'value' => $amount
            ];
            $model = (new Wechat($uid, $amount, $activityModel));
        }
        if ($activityModel->withdraw_code == 2) {
            $rankingReward[] = [
                'type' => 'balance',
                'value' => $amount
            ];
            $model = (new Balance($uid, $amount));
        }
        if ($activityModel->withdraw_code == 3) {
            $model = (new Point($uid, $amount));
        }
        if ($activityModel->withdraw_code == 4) {
            $model = (new Love($uid, $amount));
        }
        $res = $model->sendAmount();

        /**活动排行榜**/
        if (app('plugins')->isEnabled('activity-ranking')) {
            //监听额度变化
            event(new \Yunshop\ActivityRanking\event\QuotaChangeEvent(
                    \YunShop::app()->uniacid,
                    $uid,
                    $rankingReward,
                    5, '口令红包奖励扣除')
            );
        }

        return $res;
    }

    public function getBonus($total, $num, $max, $min)
    {
        $re=[];
        while ($num>0){
            $vag=round($total/$num,2);
            $num--;
            $tmp_max=min($max,round($total-$num*$min,2));//保证剩下红包金额不小于范围中的最小值
            $tmp_min=max($min,round($total-$num*$max,2));//保证剩下红包金额不大于范围中的最大值
            $vag_diff=min($tmp_max-$vag,$vag-$tmp_min);//这是波动幅度
            $end_max=$vag+$vag_diff;
            $end_min=$vag-$vag_diff;
            $money=mt_rand($end_min*100,$end_max*100)/100;
            $total-=$money;
            $re[]=$money;
        }
        return $re;
    }

    public function getBonus1($bonus_total, $bonus_count, $bonus_max, $bonus_min)
    {
        $result = array();

        $average = $bonus_total / $bonus_count;

        for ($i = 0; $i < $bonus_count; $i++) {
            //因为小红包的数量通常是要比大红包的数量要多的，因为这里的概率要调换过来。
            //当随机数>平均值，则产生小红包
            //当随机数<平均值，则产生大红包
            if (rand($bonus_min, $bonus_max) > $average) {
                // 在平均线上减钱
                $temp = $bonus_min + $this->xRandom($bonus_min, $average);
                $result[$i] = $temp;
                $bonus_total -= $temp;
            } else {
                // 在平均线上加钱
                $temp = $bonus_max - $this->xRandom($average, $bonus_max);
                $result[$i] = $temp;
                $bonus_total -= $temp;
            }
        }
        // 如果还有余钱，则尝试加到小红包里，如果加不进去，则尝试下一个。
        while ($bonus_total > 0) {
            for ($i = 0; $i < $bonus_count; $i++) {
                if ($bonus_total > 0 && $result[$i] < $bonus_max) {
                    $result[$i]++;
                    $bonus_total--;
                }
            }
        }
        // 如果钱是负数了，还得从已生成的小红包中抽取回来
        while ($bonus_total < 0) {
            for ($i = 0; $i < $bonus_count; $i++) {
                if ($bonus_total < 0 && $result[$i] > $bonus_min) {
                    $result[$i]--;
                    $bonus_total++;
                }
            }
        }
        return $result;
    }

    /**
     * 求一个数的平方
     * @param $n
     */
    private function sqr($n){
        return $n*$n;
    }

    /**
     * 生产min和max之间的随机数，但是概率不是平均的，从min到max方向概率逐渐加大。
     * 先平方，然后产生一个平方值范围内的随机数，再开方，这样就产生了一种“膨胀”再“收缩”的效果。
     */
    private function xRandom($bonus_min,$bonus_max){
        $sqr = intval($this->sqr($bonus_max-$bonus_min));
        $rand_num = rand(0, ($sqr-1));
        return intval(sqrt($rand_num));
    }
}