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@@ -0,0 +1,182 @@
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+<?php
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+/**
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+ * Created by PhpStorm.
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+ * User: stanley-king
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+ * Date: 16/6/21
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+ * Time: 下午1:07
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+ */
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+
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+namespace bonus;
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+
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+use \Exception;
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+use \Db;
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+
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+class shaker
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+{
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+ const max_strength = 5;
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+ const min_amount = 0.01;
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+
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+ const direct_asc = 0;
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+ const direct_dec = 1;
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+
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+ public function reassign($type_id,$bonus_id,&$bonus_valin,$strength,$direction)
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+ {
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+ try
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+ {
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+ $bonus_val = $bonus_valin;
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+ Db::beginTransaction();
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+
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+ $mod_bonus = Model('user_bonus');
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+
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+ $min_amount = self::min_amount;
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+ $items = $mod_bonus->get(array('type_id' => $type_id,'bonus_status' => 0,'bonus_value' => array('gt',$min_amount)));
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+ if(!empty($items))
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+ {
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+ $total_num = $this->weight_num($strength,count($items));
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+
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+ $total_amount = 0;
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+ $index = 0;
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+ $selitems = array();
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+ foreach ($items as $bonus)
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+ {
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+ $total_amount += intval($bonus['bonus_value'] * 100 + 0.5);
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+ array_push($selitems,$bonus);
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+
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+ if(++$index >= $total_num) {
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+ break;
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+ }
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+ }
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+
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+ $total_amount = floatval($total_amount / 100);
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+ $ret = $this->separate($bonus_val,$total_amount,$total_num,$direction,$strength);
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+ if($ret == true)
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+ {
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+ $type = type::create_by_id($type_id);
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+ $type_max_value = $type->max_amount();
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+
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+ $alloc = new allocator();
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+ $moneys = $alloc->separate_money(self::min_amount,$total_amount,$total_num,$min_val,$max_val);
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+
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+ $ret = $mod_bonus->where(array('type_id' => $type_id,'bonus_id' => $bonus_id))->update(array('bonus_value' => $bonus_val));
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+ if($ret == false || $mod_bonus->affected_rows() <= 0) {
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+ throw new Exception();
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+ }
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+
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+ $index = 0;
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+ $max_value = 0.00;
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+ foreach ($selitems as &$item) {
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+ $item['bonus_value'] = $moneys[$index];
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+ $max_value = $this->max($max_val,$item['bonus_value']);
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+ ++$index;
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+ }
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+ $type_max_value = $this->max($type_max_value,$max_value);
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+ $remain_change = $bonus_val - $bonus_valin;
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+ Model('bonus_type')->edit(array('type_id' => $type_id),
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+ array('max_amount' => $type_max_value,
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+ 'remain_amount' => array('exp', "remain_amount-" . "{$remain_change}"))
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+ );
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+
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+ $ret = $mod_bonus->insertAll($selitems,array(),true);
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+ if($ret == false && $mod_bonus->affected_rows() <= 0) {
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+ throw new Exception();
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+ }
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+ }
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+ }
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+
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+ Db::commit();
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+ $bonus_valin = $bonus_val;
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+ return true;
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+ }
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+ catch (Exception $ex) {
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+ Db::rollback();
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+ return false;
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+ }
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+ }
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+
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+ private function max($left,$right)
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+ {
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+ $left = intval($left * 100 + 0.5);
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+ $right = intval($right * 100 + 0.5);
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+
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+ return $left > $right ? $left / 100 : $right / 100;
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+ }
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+
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+ private function delta_asc($total,$num,$strength)
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+ {
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+ if($strength == 5) {
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+ $mul = 2;
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+ } elseif ($strength == 4) {
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+ $mul = 1.6;
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+ } elseif ($strength == 3) {
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+ $mul = 1.2;
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+ } elseif ($strength == 2) {
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+ $mul = 0.8;
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+ } elseif ($strength == 1) {
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+ $mul = 0.4;
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+ } else {
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+ return 0;
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+ }
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+
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+ $avg = floatval($total / $num);
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+ $avg = intval($avg * $mul + 0.5);
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+ return mt_rand(0,$avg);
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+ }
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+
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+ private function delta_dec($total,$strength)
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+ {
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+ if($strength == 5) {
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+ $mul = 1;
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+ } elseif ($strength == 4) {
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+ $mul = 0.8;
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+ } elseif ($strength == 3) {
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+ $mul = 0.6;
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+ } elseif ($strength == 2) {
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+ $mul = 0.4;
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+ } elseif ($strength == 1) {
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+ $mul = 0.2;
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+ } else {
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+ return 0;
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+ }
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+
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+ $avg = intval($total * $mul + 0.5);
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+ return mt_rand(0,$avg);
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+ }
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+
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+
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+ private function weight_num($strength,$total_num)
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+ {
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+ if($strength == 0) {
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+ $strength = 1;
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+ }
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+
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+ $weight = intval(floatval($total_num / self::max_strength) * $strength + 0.5);
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+ return ($weight > $total_num) ? $total_num : $weight;
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+ }
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+
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+ private function separate(&$bonus_out,&$total_amount,$total_num,$direction,$strength)
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+ {
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+ $total_tmp = intval($total_amount * 100 + 0.5);
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+ $bonus_val = intval($bonus_out * 100 + 0.5);
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+
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+ $min_amount = 1;
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+ $base_amount = $min_amount * $total_num;
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+
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+ if($base_amount == $total_tmp) {
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+ return false;
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+ }
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+
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+ if($direction == self::direct_asc) { //金额变大
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+ $delta = $this->delta_asc($total_tmp - $base_amount,$total_num + 1, $strength);
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+ $bonus_val += $delta;
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+ $total_tmp = $total_tmp - $delta;
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+ } else { //金额变小
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+ $delta = $this->delta_dec($bonus_val - self::min_amount, $strength);
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+ $bonus_val -= $delta;
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+ $total_tmp = $total_tmp + $delta;
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+ }
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+ $total_amount = $total_tmp / 100;
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+ $bonus_out = $bonus_val / 100;
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+
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+ return true;
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+ }
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+}
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