<?php

declare(strict_types=1);

namespace app\process;

use app\common\service\GameWebSocketEventBus;
use Workerman\Connection\TcpConnection;
use Workerman\Timer;

/**
 * 后台测试页 WebSocket 服务（仅用于连接联调）
 */
class GameWebSocketServer
{
    /** @var array<int, TcpConnection> */
    private static array $connections = [];

    private static bool $eventBusConsumerStarted = false;

    /**
     * 从 Redis 队列拉取事件并推送给已订阅连接。
     * 部分环境下 WebSocket 进程的 onWorkerStart 可能未触发，因此在首帧握手处也会兜底启动一次（全局仅注册一个 Timer）。
     */
    private static function ensureEventBusConsumer(): void
    {
        if (self::$eventBusConsumerStarted) {
            return;
        }
        self::$eventBusConsumerStarted = true;
        Timer::add(1, static function (): void {
            $events = GameWebSocketEventBus::popBatch();
            if ($events === []) {
                return;
            }
            foreach ($events as $event) {
                $topic = $event['topic'] ?? '';
                if (!is_string($topic) || $topic === '') {
                    continue;
                }
                $eventName = $event['event'] ?? $topic;
                $data = $event['data'] ?? [];
                if (!is_array($data)) {
                    $data = [];
                }
                $serverTime = $event['server_time'] ?? time();
                foreach (self::$connections as $connection) {
                    $topics = $connection->topics ?? [];
                    if (!is_array($topics) || !in_array($topic, $topics, true)) {
                        continue;
                    }
                    $connection->send(json_encode([
                        'event' => $eventName,
                        'topic' => $topic,
                        'data' => $data,
                        'server_time' => $serverTime,
                    ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
                }
            }
        });
    }

    public function onWorkerStart(): void
    {
        self::ensureEventBusConsumer();
    }

    public function onConnect(TcpConnection $connection): void
    {
        $connection->topics = [];
        self::$connections[$connection->id] = $connection;
    }

    public function onWebSocketConnect(TcpConnection $connection): void
    {
        self::ensureEventBusConsumer();
        $connection->send(json_encode([
            'event' => 'ws.connected',
            'message' => 'WebSocket connected',
            'connection_id' => $connection->id,
            'server_time' => time(),
            'heartbeat_interval' => 30,
        ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
    }

    public function onMessage(TcpConnection $connection, string $payload): void
    {
        $decoded = json_decode($payload, true);
        if (!is_array($decoded)) {
            $connection->send(json_encode([
                'event' => 'ws.error',
                'message' => 'Invalid JSON payload',
            ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
            return;
        }

        $action = $decoded['action'] ?? '';
        if ($action === 'ping') {
            $connection->send(json_encode([
                'event' => 'pong',
                'server_time' => date('Y-m-d H:i:s'),
            ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
            return;
        }

        if ($action === 'subscribe') {
            $topics = $decoded['topics'] ?? [];
            $sanitized = [];
            if (is_array($topics)) {
                foreach ($topics as $topic) {
                    if (!is_string($topic)) {
                        continue;
                    }
                    $value = trim($topic);
                    if ($value === '') {
                        continue;
                    }
                    $sanitized[] = $value;
                }
            }
            $connection->topics = array_values(array_unique($sanitized));
            $connection->send(json_encode([
                'event' => 'ws.subscribed',
                'topics' => $connection->topics,
            ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
            return;
        }

        $connection->send(json_encode([
            'event' => 'ws.error',
            'message' => 'Unsupported action',
            'received_action' => $action,
        ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
    }

    public function onError(TcpConnection $connection, int $code, string $msg): void
    {
        $connection->send(json_encode([
            'event' => 'ws.error',
            'message' => 'Server internal error',
            'code' => $code,
            'detail' => $msg,
        ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
    }

    public function onClose(TcpConnection $connection): void
    {
        $connection->topics = [];
        unset(self::$connections[$connection->id]);
    }
}