package io.github.ehlxr.did.server.http;

import io.github.ehlxr.did.common.Constants;
import io.github.ehlxr.did.core.SnowFlake;
import io.github.ehlxr.did.server.BaseServer;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Objects;

/**
 * Http 服务器，使用 Netty 中的 Http 协议栈，
 *
 * @author ehlxr
 */
public class HttpServer extends BaseServer {
    protected Logger logger = LoggerFactory.getLogger(HttpServer.class);
    private int port = "".equals(Constants.getEnv("HTTP_PORT")) ? Constants.HTTP_PORT : Integer.parseInt(Constants.getEnv("HTTP_PORT"));

    public HttpServer(SnowFlake snowFlake, int port) {
        Objects.requireNonNull(snowFlake, "snowflake instance not allow null");

        this.snowFlake = snowFlake;
        this.port = port == 0 ? this.port : port;
    }

    public HttpServer(SnowFlake snowFlake) {
        this(snowFlake, 0);
    }

    public static HttpServerBuilder newBuilder() {
        return new HttpServerBuilder();
    }


    @Override
    public void shutdown() {
        logger.info("HttpServer shutdowning......");
        super.shutdown();
        logger.info("HttpServer shutdown finish!");
    }

    @Override
    public void start() {
        try {
            init();

            serverBootstrap.childHandler(new ChannelInitializer<SocketChannel>() {
                @Override
                protected void initChannel(SocketChannel ch) {
                    ch.pipeline().addLast(defLoopGroup,
                            new HttpRequestDecoder(),
                            new HttpObjectAggregator(65536),
                            new HttpResponseEncoder(),
                            new HttpServerHandler(snowFlake)
                    );
                }
            });

            channelFuture = serverBootstrap.bind(port).sync();
            logger.info("HttpServer start success, port is:{}", port);
        } catch (InterruptedException e) {
            logger.error("HttpServer start fail,", e);
        }
    }

    public static final class HttpServerBuilder {
        protected SnowFlake snowFlake;
        private int port;

        private HttpServerBuilder() {
        }

        public static HttpServerBuilder aHttpServer() {
            return new HttpServerBuilder();
        }

        public HttpServerBuilder snowFlake(SnowFlake snowFlake) {
            this.snowFlake = snowFlake;
            return this;
        }

        public HttpServerBuilder port(int port) {
            this.port = port;
            return this;
        }

        public HttpServer build() {
            return new HttpServer(snowFlake, port);
        }
    }
}