<?php

namespace App\Services\AdminRealtime;

use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;

final class AdminRealtimeExchangeList
{
    public const RESOURCE = 'exchange_list';
    public const CHANNEL = 'admin.operation.exchange_list';
    public const EVENT = 'exchange_list.updated';

    /** Called inside the feed transaction while it holds the state row lock. */
    public static function collectChanges(): void
    {
        if (!Schema::hasTable('admin_exchange_list_changes')) return;

        $buffer = DB::table('admin_exchange_list_changes');
        $ids = (clone $buffer)->orderBy('id')->limit(2000)->pluck('id');
        if ($ids->isEmpty()) return;

        DB::table('admin_realtime_events')->insert([
            'resource' => self::RESOURCE,
            'resource_id' => '1',
            'action' => 'updated',
            'source' => 'bot-28',
            'created_at' => now('Asia/Shanghai')->format('Y-m-d H:i:s'),
        ]);

        // Delete only the visible rows. A long transaction can commit a lower ID later.
        $buffer->whereIntegerInRaw('id', $ids->all())->delete();
    }
}