package net.yao.pipeline.rabbitmq;

import com.aliyun.fc.runtime.Context;
import com.aliyun.fc.runtime.PojoRequestHandler;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;
import lombok.extern.slf4j.Slf4j;
import okhttp3.*;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * RabbitMQ 消费者 - 阿里云函数计算实现
 */
@Slf4j
public class RabbitConsumer implements PojoRequestHandler<String, Void> {

    private static final String RABBITMQ_HOST = "rabbitmq-cn-39y4twfud01-cn-beijing-vpc.mq.amqp.aliyuncs.com";
    private static final int RABBITMQ_PORT = 5672;
    private static final String RABBITMQ_USERNAME = "MjpyYWJiaXRtcS1jbi0zOXk0dHdmdWQwMTpMVEFJNXQ2SDR1OGFxb3A3cGViNkRSOFo=";
    private static final String RABBITMQ_PASSWORD = "MDdCQ0FFNjFEMTQyMEZDN0UyMThDNkM4MDgwMkI5QzgyNjAzQTdGQzoxNzgyMTk2NzQxNjcy";
    private static final String QUEUE_NAME = "vector.search.task.img.dul.check.queue";
    private static final String V_HOST = "test";

    private static final String PIPELINE_API = "http://1861991840278303.eventbridge.cn-beijing.aliyuncs.com/webhook/putEvents?token=63b99b24a3d545d880fa86f57c5ae56cae00c81d2fc74d058e9ace260515163132f6e27deeaa4bd4bc8e2a21cf6b6d6517b8d1e6d33c4de89f00c3524a54095b";

    private static ConnectionFactory factory;
    private static Connection connection;
    private static Channel channel;
    private static final OkHttpClient httpClient = new OkHttpClient.Builder()
            .connectTimeout(10, TimeUnit.SECONDS)
            .readTimeout(30, TimeUnit.SECONDS)
            .writeTimeout(30, TimeUnit.SECONDS)
            .build();
    private static final MediaType JSON = MediaType.get("application/json; charset=utf-8");

    @Override
    public Void handleRequest(String input, Context context) {
        log.info("函数计算启动, Request ID: {}", context.getRequestId());

        try {
            // 初始化 RabbitMQ 连接
            initRabbitMQ();
            // 启动消费者
            startConsumer();
            log.info("RabbitMQ 消费者启动成功");
        } catch (Exception e) {
            log.error("启动 RabbitMQ 消费者失败", e);
            throw new RuntimeException("启动失败: " + e.getMessage(), e);
        }
        return null;
    }

    /**
     * 初始化 RabbitMQ 连接
     */
    private void initRabbitMQ() throws IOException, TimeoutException {
        if (factory == null) {
            factory = new ConnectionFactory();
            factory.setHost(RABBITMQ_HOST);
            factory.setPort(RABBITMQ_PORT);
            factory.setUsername(RABBITMQ_USERNAME);
            factory.setPassword(RABBITMQ_PASSWORD);
            factory.setVirtualHost(V_HOST);

            log.info("连接 RabbitMQ: {}:{}", RABBITMQ_HOST, RABBITMQ_PORT);
            connection = factory.newConnection();
            channel = connection.createChannel();

            // 声明队列
            channel.queueDeclare(QUEUE_NAME, true, false, false, null);
            log.info("队列声明成功: {}", QUEUE_NAME);
        }
    }

    /**
     * 启动消费者
     */
    private void startConsumer() throws IOException {
        channel.basicQos(1);

        log.info("开始消费队列: {}", QUEUE_NAME);
        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), StandardCharsets.UTF_8);
            log.info("收到消息: {}", message);

            try {
                processMessage(message);
                channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
                log.info("消息处理成功并已确认");
            } catch (Exception e) {
                log.error("处理消息失败", e);
                channel.basicNack(delivery.getEnvelope().getDeliveryTag(), false, true);
                log.warn("消息已重新入队");
            }
        };

        channel.basicConsume(QUEUE_NAME, false, deliverCallback, consumerTag -> {
            log.info("消费者被取消: {}", consumerTag);
        });
    }

    private void processMessage(String message) {
        RequestBody body = RequestBody.create(message, JSON);
        Request request = new Request.Builder().url(PIPELINE_API).put(body).build();

        try (Response response = httpClient.newCall(request).execute()) {
            if (response.isSuccessful()) {
                String responseBody = response.body() != null ? response.body().string() : "";
                log.info("Pipline API 请求成功:{}", responseBody);
            } else {
                log.info("Pipline API 请求失败:{}", response.code());
            }
        } catch (Exception e) {
            log.error("Pipline API 请求异常", e);
        }
    }
}