<?php

/**
 * 文件功能：双色球奖池流水 Model
 *
 * 记录每期奖池的每笔变动，提供透明的奖池历史查询。
 * reason 取值：ticket_sale / carry_over / admin_inject / system_inject / payout / prize_4th / prize_5th
 *
 * @author  ChatRoom Laravel
 *
 * @version 1.0.0
 */

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class LotteryPoolLog extends Model
{
    public $timestamps = false;

    protected $fillable = [
        'issue_id',
        'change_amount',
        'reason',
        'pool_after',
        'remark',
        'created_at',
    ];

    /**
     * 字段类型转换。
     */
    protected function casts(): array
    {
        return [
            'change_amount' => 'integer',
            'pool_after' => 'integer',
            'created_at' => 'datetime',
        ];
    }

    // ─── 关联 ──────────────────────────────────────────────────────────

    /**
     * 关联的期次。
     */
    public function issue(): BelongsTo
    {
        return $this->belongsTo(LotteryIssue::class, 'issue_id');
    }

    // ─── 业务方法 ──────────────────────────────────────────────────────

    /**
     * 返回 reason 的中文标签。
     */
    public function reasonLabel(): string
    {
        return match ($this->reason) {
            'ticket_sale' => '购票入池',
            'carry_over' => '上期滚存',
            'admin_inject' => '管理员注入',
            'system_inject' => '超级期系统注入',
            'payout' => '派奖扣除',
            'prize_4th' => '四等奖固定扣除',
            'prize_5th' => '五等奖固定扣除',
            default => $this->reason,
        };
    }
}