90 lines
2.0 KiB
PHP
90 lines
2.0 KiB
PHP
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<?php
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/**
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* 文件功能：钓鱼事件模型
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*
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* 对应 fishing_events 表，每条记录是一个钓鱼随机奖惩事件。
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* 概率由 weight（权重）字段决定，权重越大被选中概率越高。
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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\Builder;
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use Illuminate\Database\Eloquent\Model;
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class FishingEvent extends Model
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{
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/**
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* 可批量赋值字段
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*
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* @var array<int, string>
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*/
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protected $fillable = [
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'emoji',
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'name',
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'message',
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'exp',
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'jjb',
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'weight',
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'is_active',
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'sort',
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];
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/**
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* 字段类型转换
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*
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* @return array<string, string>
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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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'exp' => 'integer',
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'jjb' => 'integer',
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'weight' => 'integer',
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'is_active' => 'boolean',
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'sort' => 'integer',
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];
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}
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/**
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* 作用域：只查询已启用的事件
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*/
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public function scopeActive(Builder $query): Builder
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{
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return $query->where('is_active', true);
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}
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/**
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* 根据权重随机抽取一个激活的钓鱼事件
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*
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* 实现加权随机：权重越大，被选中概率越高。
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* 若无任何激活事件，返回 null。
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*/
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public static function rollOne(): ?static
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{
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$events = static::active()->orderBy('sort')->get();
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if ($events->isEmpty()) {
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return null;
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}
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// 计算总权重后加权随机
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$totalWeight = $events->sum('weight');
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$roll = random_int(1, max($totalWeight, 1));
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$cumulative = 0;
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foreach ($events as $event) {
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$cumulative += $event->weight;
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if ($roll <= $cumulative) {
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return $event;
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}
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}
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// 兜底：返回最后一个
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return $events->last();
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}
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}
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