<?php

namespace App\Services\AdminRealtime;

use App\Constants\HttpStatus;
use App\Http\Controllers\admin\Online;
use App\Http\Controllers\admin\PaymentOrder;
use Illuminate\Http\JsonResponse;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use RuntimeException;

/** 全量统计按变化登记事件，覆盖跨仓库写入、在线平台变化及统计时间窗口到期。 */
final class AdminRealtimeSummaries
{
    public const DEFINITIONS = [
        'online_platform_count' => ['admin.stats.platform_count', Online::class, 'platformCount'],
        'payment_unprocessed' => ['admin.stats.unprocessed', PaymentOrder::class, 'unProcessed'],
    ];

    public static function read(string $resource): array
    {
        [, $controller, $method] = self::DEFINITIONS[$resource];
        // 复用 HTTP 端点本身，统计字段、筛选条件和时间窗口只有一个实现。
        $response = app()->call([app()->make($controller), $method]);
        $body = $response instanceof JsonResponse ? $response->getData(true) : [];
        if (($body['code'] ?? null) !== HttpStatus::OK || !is_array($body['data'] ?? null)) {
            throw new RuntimeException($controller . '@' . $method . ' failed: ' . ($body['msg'] ?? 'invalid response'));
        }
        return $body['data'];
    }

    public static function scan(): void
    {
        if (!config('admin_realtime.enabled')) return;
        $interval = max(1, (int) config('admin_realtime.summary_scan_seconds', 5));
        foreach (array_keys(self::DEFINITIONS) as $resource) {
            try {
                if (!Cache::add('admin_realtime:summary_scan:' . $resource, 1, $interval)) continue;
                $signature = hash('sha256', json_encode(self::read($resource), JSON_THROW_ON_ERROR));
                $key = 'admin_realtime:summary_snapshot:' . $resource;
                if (Cache::get($key) === $signature) continue;

                // 必须先确认事件登记成功再记住快照；失败或崩溃最多重复，不会吞掉变化。
                if (!DB::table('admin_realtime_events')->insert([
                    'resource' => $resource, 'resource_id' => '1', 'action' => 'updated',
                    'source' => 'bot-28', 'created_at' => now('Asia/Shanghai')->format('Y-m-d H:i:s'),
                ])) throw new RuntimeException('Summary event registration failed');
                Cache::forever($key, $signature);
            } catch (\Throwable $e) {
                Log::channel('realtime')->error('admin_realtime_summary_scan_failed', [
                    'resource' => $resource, 'error' => $e->getMessage(),
                ]);
            }
        }
    }
}