108 lines
3.6 KiB
PHP
108 lines
3.6 KiB
PHP
<?php
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namespace App\Services\Jackpot;
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use App\Models\Draw;
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use App\Models\TicketItem;
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use App\Lottery\DrawStatus;
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use App\Models\JackpotPool;
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use App\Models\JackpotPayoutLog;
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use Illuminate\Support\Collection;
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/**
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* 产品文档 §5.11.2–5.11.3：中头奖且满足阈值或连续未爆期数 → 按比例释放奖池，按注项 `total_bet_amount` 比例分配。
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*/
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final class JackpotBurstAllocator
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{
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/**
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* @param Collection<int, array{item: TicketItem, matched_tier: ?string, gross_win: int}> $results
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* @return array{allocations: array<int, int>, pool_payout: int, trigger: ?string}
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*/
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public function allocate(Draw $draw, JackpotPool $pool, Collection $results): array
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{
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$winners = $results->filter(
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fn (array $r) => ($r['matched_tier'] ?? null) === 'first' && (int) $r['gross_win'] > 0,
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);
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if ($winners->isEmpty()) {
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return ['allocations' => [], 'pool_payout' => 0, 'trigger' => null];
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}
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$thresholdOk = (int) $pool->current_amount >= (int) $pool->trigger_threshold;
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$gapOk = $this->gapTriggerMet($pool);
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if (! $thresholdOk && ! $gapOk) {
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return ['allocations' => [], 'pool_payout' => 0, 'trigger' => null];
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}
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$trigger = $thresholdOk ? 'threshold' : 'forced_gap';
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$poolBefore = (int) $pool->current_amount;
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$poolPayout = (int) floor($poolBefore * (float) $pool->payout_rate);
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if ($poolPayout <= 0) {
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return ['allocations' => [], 'pool_payout' => 0, 'trigger' => null];
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}
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$list = $winners->values()->all();
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$weightTotal = 0;
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foreach ($list as $r) {
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$weightTotal += (int) $r['item']->total_bet_amount;
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}
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if ($weightTotal <= 0) {
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return ['allocations' => [], 'pool_payout' => 0, 'trigger' => null];
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}
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$allocations = [];
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$remaining = $poolPayout;
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$n = count($list);
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foreach ($list as $idx => $r) {
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/** @var TicketItem $item */
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$item = $r['item'];
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$w = (int) $item->total_bet_amount;
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if ($idx === $n - 1) {
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$share = max(0, $remaining);
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} else {
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$share = (int) floor($poolPayout * $w / $weightTotal);
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$remaining -= $share;
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}
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$allocations[(int) $item->id] = $share;
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}
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$pool->forceFill([
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'current_amount' => max(0, $poolBefore - $poolPayout),
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'last_trigger_draw_id' => $draw->id,
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])->save();
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JackpotPayoutLog::query()->create([
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'draw_id' => $draw->id,
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'jackpot_pool_id' => $pool->id,
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'trigger_type' => $trigger,
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'total_payout_amount' => $poolPayout,
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'winner_count' => count($allocations),
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'trigger_snapshot_json' => [
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'threshold_ok' => $thresholdOk,
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'gap_ok' => $gapOk,
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'pool_amount_before' => $poolBefore,
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'payout_rate' => (string) $pool->payout_rate,
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],
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]);
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return ['allocations' => $allocations, 'pool_payout' => $poolPayout, 'trigger' => $trigger];
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}
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private function gapTriggerMet(JackpotPool $pool): bool
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{
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$gap = (int) $pool->force_trigger_draw_gap;
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if ($gap <= 0) {
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return false;
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}
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$lastId = (int) ($pool->last_trigger_draw_id ?? 0);
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$count = Draw::query()
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->where('status', DrawStatus::Settled->value)
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->when($lastId > 0, fn ($q) => $q->where('id', '>', $lastId))
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->count();
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return $count >= $gap;
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}
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}
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