import fp from 'fastify-plugin'
import { type FastifyPluginAsync } from 'fastify'
import { PgPubSub } from '@imqueue/pg-pubsub'
import { env } from '../config/env'
import logger from '../utils/logger'

declare module 'fastify' {
    interface FastifyInstance {
        pubsub: PgPubSub
    }
}


const pubsubPlugin: FastifyPluginAsync = async (fastify) => {
    const pubsub = new PgPubSub({
        singleListener: false,
        connectionString: env.DATABASE_URL,
    })

    await pubsub.connect().catch(err => logger.error('PubSub error:', err));

    fastify.decorate('pubsub', pubsub)

    // Graceful shutdown
    fastify.addHook('onClose', async () => {
        await pubsub.close()
    })


    pubsub.on('connect', () => {
        logger.debug('✅ PubSub connected');
    });
    pubsub.on('end', () => logger.warn('pubsub Connection closed!'));

}
// Export plugin with metadata
export default fp(pubsubPlugin, {
    fastify: '5.x',
    name: 'pubsub'
})