<?php

namespace App\Events;

use Illuminate\Broadcasting\Channel;
use Illuminate\Queue\SerializesModels;
use Illuminate\Foundation\Events\Dispatchable;
use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Contracts\Broadcasting\ShouldBroadcastNow;

/**
 * 界面文档 §2.1：`odds.update` —— 赔率变更推送。
 *
 * 触发时机：后台发布新赔率版本时。
 * 前端处理：Toast 提示用户赔率已更新，建议重新预览注单。
 */
final class OddsUpdateBroadcast implements ShouldBroadcastNow
{
    use Dispatchable, InteractsWithSockets, SerializesModels;

    /**
     * @param  int  $versionId  新版本 ID
     * @param  string  $versionName  版本名称/描述
     * @param  array<string, mixed>|null  $diff  差异数据（哪些玩法赔率变化了，可选）
     * @param  int  $emittedAtMs  发送时间戳（毫秒）
     */
    public function __construct(
        public readonly int $versionId,
        public readonly string $versionName,
        public readonly ?array $diff,
        public readonly int $emittedAtMs,
    ) {}

    /**
     * 公共频道，所有在大厅的玩家都能收到。
     *
     * @return array<int, Channel>
     */
    public function broadcastOn(): array
    {
        return [new Channel('lottery-hall')];
    }

    public function broadcastAs(): string
    {
        return 'odds.update';
    }

    /**
     * @return array{version_id: int, version_name: string, diff: array<string, mixed>|null, message: string, emitted_at_ms: int}
     */
    public function broadcastWith(): array
    {
        return [
            'version_id' => $this->versionId,
            'version_name' => $this->versionName,
            'diff' => $this->diff,
            'message' => '赔率已更新，请重新预览注单',
            'emitted_at_ms' => $this->emittedAtMs,
        ];
    }
}