160 lines
4.5 KiB
PHP
160 lines
4.5 KiB
PHP
<?php
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/**
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* 文件功能：赛马竞猜局次模型
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*
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* 代表一场赛马比赛，包含参赛马匹信息、场次状态、
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* 注池统计以及赛果信息。提供当前场次查询和赔率计算方法。
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*
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* @author ChatRoom Laravel
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*
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* @version 1.0.0
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*/
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namespace App\Models;
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use Illuminate\Database\Eloquent\Model;
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use Illuminate\Database\Eloquent\Relations\HasMany;
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class HorseRace extends Model
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{
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protected $fillable = [
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'status',
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'bet_opens_at',
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'bet_closes_at',
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'race_starts_at',
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'race_ends_at',
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'horses',
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'winner_horse_id',
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'total_bets',
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'total_pool',
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'settled_at',
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];
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/**
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* 属性类型转换。
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*/
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protected function casts(): array
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{
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return [
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'bet_opens_at' => 'datetime',
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'bet_closes_at' => 'datetime',
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'race_starts_at' => 'datetime',
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'race_ends_at' => 'datetime',
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'settled_at' => 'datetime',
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'horses' => 'array',
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'winner_horse_id' => 'integer',
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'total_bets' => 'integer',
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'total_pool' => 'integer',
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];
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}
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/**
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* 本场所有下注记录。
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*/
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public function bets(): HasMany
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{
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return $this->hasMany(HorseBet::class, 'race_id');
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}
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/**
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* 判断当前是否在押注时间窗口内。
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*/
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public function isBettingOpen(): bool
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{
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return $this->status === 'betting'
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&& now()->between($this->bet_opens_at, $this->bet_closes_at);
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}
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/**
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* 查询当前正在进行的场次（状态为 betting 且押注未截止）。
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*/
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public static function currentRace(): ?static
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{
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return static::query()
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->whereIn('status', ['betting', 'running'])
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->latest()
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->first();
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}
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/**
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* 生成参赛马匹列表（根据马匹数量随机选名）。
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*
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* @param int $count 马匹数量
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* @return array<int, array{id: int, name: string, emoji: string}>
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*/
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public static function generateHorses(int $count): array
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{
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// 可用马匹名池（原版竞技风格）
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$namePool = [
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['name' => '赤兔', 'emoji' => '🐎'],
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['name' => '乌骓', 'emoji' => '🐴'],
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['name' => '的卢', 'emoji' => '🎠'],
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['name' => '绝影', 'emoji' => '🦄'],
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['name' => '紫骍', 'emoji' => '🐎'],
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['name' => '爪黄', 'emoji' => '🐴'],
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['name' => '汗血', 'emoji' => '🎠'],
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['name' => '飞电', 'emoji' => '⚡'],
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];
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// 随机打乱并取前 N 个
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shuffle($namePool);
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$selected = array_slice($namePool, 0, $count);
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$horses = [];
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foreach ($selected as $i => $horse) {
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$horses[] = [
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'id' => $i + 1,
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'name' => $horse['name'],
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'emoji' => $horse['emoji'],
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];
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}
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return $horses;
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}
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/**
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* 计算本场可派奖总池。
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*
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* 可派奖池 = 系统初始化资金池 + 玩家总下注 - 抽水，
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* 且至少不低于中奖马匹总下注，避免出现“押中反亏”的体验。
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*
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* @param array<int, int|float> $horseBetAmounts
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*/
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public static function calcDistributablePool(array $horseBetAmounts, int $housePercent, int $seedPool = 0, int $winnerPool = 0): float
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{
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$totalPool = array_sum($horseBetAmounts);
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$netPlayerPool = $totalPool * (1 - $housePercent / 100);
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return max($netPlayerPool + max(0, $seedPool), $winnerPool);
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}
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/**
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* 根据注池计算各马匹实时赔率（含系统初始化资金池）。
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*
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* @param array<int, int|float> $horseBetAmounts 各马匹的注额数组 [horse_id => amount]
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* @return array<int, float> horse_id => 赔率（含本金）
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*/
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public static function calcOdds(array $horseBetAmounts, int $housePercent, int $seedPool = 0): array
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{
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$totalPool = array_sum($horseBetAmounts);
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if ($totalPool <= 0) {
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return array_map(fn () => 1.0, $horseBetAmounts);
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}
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$distributablePool = static::calcDistributablePool($horseBetAmounts, $housePercent, $seedPool);
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$odds = [];
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foreach ($horseBetAmounts as $horseId => $amount) {
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if ($amount <= 0) {
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$odds[$horseId] = round($distributablePool, 2);
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} else {
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$odds[$horseId] = round($distributablePool / $amount, 2);
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}
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}
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return $odds;
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}
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}
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