98 lines
2.7 KiB
PHP
98 lines
2.7 KiB
PHP
<?php
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namespace App\Services;
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use App\Enums\DrawLogStatus;
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use App\Enums\DrawPrizeType;
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use App\Exceptions\BizException;
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use App\Models\DrawActivity;
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use App\Models\DrawActivityPrize;
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use App\Models\DrawLog;
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use App\Models\User;
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use Illuminate\Support\Facades\DB;
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class DrawActivityService
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{
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/**
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* 活动抽奖
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*
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* @param \App\Models\DrawActivity $drawActivity
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* @param \App\Models\User $user
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* @return \App\Models\DrawLog
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*/
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public function draw(DrawActivity $drawActivity, User $user): DrawLog
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{
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if (! $drawActivity->isPublished()) {
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throw new BizException('抽奖活动未发布');
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}
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if ($drawActivity->isUnstart()) {
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throw new BizException('抽奖活动未开始');
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}
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if ($drawActivity->isClosed()) {
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throw new BizException('抽奖活动已结束');
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}
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(new DrawTicketService())->change($user, $drawActivity, -1, '活动抽奖');
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$prize = $this->getDrawActivityPrize($drawActivity);
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// 如果限制了奖品数量，则需扣除奖品库存
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if ($prize->limited) {
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$prize->update([
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'stock' => DB::raw('stock-1'),
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'winnings' => DB::raw('winnings+1'),
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]);
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} else {
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$prize->increment('winnings', 1);
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}
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$drawLog = DrawLog::create([
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'user_id' => $user->id,
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'draw_activity_id' => $drawActivity->id,
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'draw_activity_prize_id' => $prize->id,
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'status' => match ($prize->type) {
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DrawPrizeType::None => DrawLogStatus::Completed,
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default => DrawLogStatus::Pending,
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},
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]);
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return $drawLog->setRelation('prize', $prize);
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}
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/**
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* @param \App\Models\DrawActivity $drawActivity
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* @return \App\Models\DrawActivityPrize
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*/
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protected function getDrawActivityPrize(DrawActivity $drawActivity): DrawActivityPrize
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{
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$drawActivityPrizes = $drawActivity->prizes()->get();
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// 过滤权重为0或库存不足的奖品
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$prizes = $drawActivityPrizes->filter(function ($item) {
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if ($item->weight === 0 || ($item->limited && $item->stock === 0)) {
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return false;
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}
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return true;
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});
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$max = $prizes->sum('weight');
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if ($max > 0) {
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$rand = mt_rand($min = 1, $max);
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foreach ($prizes as $prize) {
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if ($rand <= $prize->weight + $min) {
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return $prize;
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}
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$min += $prize->weight;
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}
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}
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throw new BizException('抽奖活动异常');
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}
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}
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