package com.xcong.excoin.modules.newPrice;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.xcong.excoin.rabbit.pricequeue.WebsocketPriceService;
import com.xcong.excoin.utils.CoinTypeConvert;
import com.xcong.excoin.utils.RedisUtils;
import lombok.extern.slf4j.Slf4j;
import org.java_websocket.client.WebSocketClient;
import org.java_websocket.handshake.ServerHandshake;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.annotation.Resource;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicReference;

/**
 * OKX 新价格 WebSocket 客户端类，用于连接 OKX 的 WebSocket 接口，
 * 实时获取并处理标记价格（mark price）数据，并将价格信息存储到 Redis 中。
 * 同时支持心跳检测、自动重连以及异常恢复机制。
 * @author Administrator
 */
@Slf4j
@Component
@ConditionalOnProperty(prefix = "app", name = "websocket", havingValue = "true")
public class OkxNewPriceWebSocketClient {
    @Resource
    private WebsocketPriceService websocketPriceService;
    @Resource
    private RedisUtils redisUtils;

    private WebSocketClient webSocketClient;
    private ScheduledExecutorService heartbeatExecutor;
    private volatile ScheduledFuture<?> pongTimeoutFuture;
    private final AtomicReference<Long> lastMessageTime = new AtomicReference<>(System.currentTimeMillis());

    private static final String WS_URL = "wss://ws.okx.com:8443/ws/v5/public";
    private static final String CHANNEL = "mark-price";

    private static final String[] INST_IDS = {
            "EOS-USDT","BTC-USDT", "ETH-USDT", "XRP-USDT", "LTC-USDT", "BCH-USDT", "ETC-USDT"
    };

    // 心跳超时时间(秒)，小于30秒
    private static final int HEARTBEAT_TIMEOUT = 10;

    // 共享线程池用于重连等异步任务
    private final ExecutorService sharedExecutor = Executors.newCachedThreadPool(r -> {
        Thread t = new Thread(r, "okx-ws-shared-worker");
        t.setDaemon(true);
        return t;
    });

    /**
     * 初始化方法，在 Spring Bean 构造完成后执行。
     * 负责建立 WebSocket 连接并启动心跳检测任务。
     */
    @PostConstruct
    public void init() {
        connect();
        startHeartbeat();
    }

    /**
     * 销毁方法，在 Spring Bean 销毁前执行。
     * 关闭 WebSocket 连接、停止心跳定时器及相关的线程资源。
     */
    @PreDestroy
    public void destroy() {
        if (webSocketClient != null && webSocketClient.isOpen()) {
            webSocketClient.close();
        }
        if (heartbeatExecutor != null) {
            heartbeatExecutor.shutdownNow();
        }
        if (pongTimeoutFuture != null) {
            pongTimeoutFuture.cancel(true);
        }
        sharedExecutor.shutdownNow();
    }

    /**
     * 建立与 OKX WebSocket 服务器的连接。
     * 设置回调函数以监听连接打开、接收消息、关闭和错误事件。
     */
    private void connect() {
        try {
            URI uri = new URI(WS_URL);
            webSocketClient = new WebSocketClient(uri) {
                @Override
                public void onOpen(ServerHandshake handshake) {
                    log.info("OKX New Price WebSocket连接成功");
                    resetHeartbeatTimer();
                    subscribeChannels();
                }

                @Override
                public void onMessage(String message) {
                    lastMessageTime.set(System.currentTimeMillis());
                    handleWebSocketMessage(message);
                    resetHeartbeatTimer();
                }

                @Override
                public void onClose(int code, String reason, boolean remote) {
                    log.warn("OKX New Price WebSocket连接关闭: code={}, reason={}", code, reason);
                    cancelPongTimeout();

                    sharedExecutor.execute(() -> {
                        try {
                            reconnectWithBackoff();
                        } catch (InterruptedException ignored) {
                            Thread.currentThread().interrupt();
                        } catch (Exception e) {
                            log.error("重连失败", e);
                        }
                    });
                }

                @Override
                public void onError(Exception ex) {
                    log.error("OKX New Price WebSocket发生错误", ex);
                }
            };

            webSocketClient.connect();
        } catch (URISyntaxException e) {
            log.error("WebSocket URI格式错误", e);
        }
    }

    /**
     * 订阅指定交易对的价格通道。
     * 构造订阅请求并发送给服务端。
     */
    private void subscribeChannels() {
        JSONObject subscribeMsg = new JSONObject();
        subscribeMsg.put("op", "subscribe");

        JSONArray argsArray = new JSONArray();
        for (String instId : INST_IDS) {
            JSONObject arg = new JSONObject();
            arg.put("channel", CHANNEL);
            arg.put("instId", instId);
            argsArray.add(arg);
        }

        subscribeMsg.put("args", argsArray);
        webSocketClient.send(subscribeMsg.toJSONString());
        log.info("已发送价格订阅请求，订阅通道数: {}", argsArray.size());
    }

    /**
     * 处理从 WebSocket 收到的消息。
     * 包括订阅确认、错误响应、心跳响应以及实际的数据推送。
     *
     * @param message 来自 WebSocket 的原始字符串消息
     */
    private void handleWebSocketMessage(String message) {
        try {
            JSONObject response = JSON.parseObject(message);
            String event = response.getString("event");

            if ("subscribe".equals(event)) {
                log.info("价格订阅成功: {}", response.getJSONObject("arg"));
            } else if ("error".equals(event)) {
                log.error("价格订阅错误: code={}, msg={}",
                        response.getString("code"), response.getString("msg"));
            } else if ("pong".equals(event)) {
                log.debug("收到pong响应");
                cancelPongTimeout();
            } else {
                processPushData(response);
            }
        } catch (Exception e) {
            log.error("处理WebSocket消息失败: {}", message, e);
        }
    }

    /**
     * 解析并处理价格推送数据。
     * 将最新的标记价格存入 Redis 并触发后续业务逻辑比较处理。
     *
     * @param response 包含价格数据的 JSON 对象
     */
    private void processPushData(JSONObject response) {
        try {
            JSONArray dataArray = response.getJSONArray("data");
            if (dataArray != null && !dataArray.isEmpty()) {
                for (int i = 0; i < dataArray.size(); i++) {
                    try {
                        JSONObject priceData = dataArray.getJSONObject(i);
                        String instId = priceData.getString("instId");
                        String markPx = priceData.getString("markPx");
                        String ts = priceData.getString("ts");

                        String redisKey = buildRedisKey(instId);
                        redisUtils.set(redisKey, markPx);

                        String symbol = CoinTypeConvert.okxConvert(instId);
                        if (symbol != null) {
                            redisUtils.set(CoinTypeConvert.convertToKey(symbol), markPx);
                            websocketPriceService.comparePriceAsc(symbol, markPx);
                            websocketPriceService.comparePriceDesc(symbol, markPx);
                        }

                        log.debug("更新最新价格: {} = {}, 时间: {}", redisKey, markPx, ts);
                    } catch (Exception innerEx) {
                        log.warn("处理单条价格数据失败", innerEx);
                    }
                }
            }
        } catch (Exception e) {
            log.error("处理价格推送数据失败", e);
        }
    }

    /**
     * 构建 Redis Key
     */
    private String buildRedisKey(String instId) {
        return "PRICE_" + instId.replace("-", "");
    }

    /**
     * 启动心跳检测任务。
     * 使用 ScheduledExecutorService 定期检查是否需要发送 ping 请求来维持连接。
     */
    private void startHeartbeat() {
        if (heartbeatExecutor != null) {
            heartbeatExecutor.shutdownNow();
        }

        heartbeatExecutor = Executors.newSingleThreadScheduledExecutor(r -> {
            Thread t = new Thread(r, "okx-newprice-heartbeat");
            t.setDaemon(true);
            return t;
        });

        heartbeatExecutor.scheduleWithFixedDelay(this::checkHeartbeatTimeout, 25, 25, TimeUnit.SECONDS);
    }

    /**
     * 重置心跳计时器。
     * 当收到新消息或发送 ping 后取消当前超时任务并重新安排下一次超时检查。
     */
    private synchronized void resetHeartbeatTimer() {
        cancelPongTimeout();

        if (heartbeatExecutor != null) {
            pongTimeoutFuture = heartbeatExecutor.schedule(this::checkHeartbeatTimeout,
                    HEARTBEAT_TIMEOUT, TimeUnit.SECONDS);
        }
    }

    /**
     * 检查心跳超时情况。
     * 若长时间未收到任何消息则主动发送 ping 请求保持连接活跃。
     */
    private void checkHeartbeatTimeout() {
        long currentTime = System.currentTimeMillis();
        long lastTime = lastMessageTime.get();

        if (currentTime - lastTime >= HEARTBEAT_TIMEOUT * 1000L) {
            sendPing();
        }
    }

    /**
     * 发送 ping 请求至 WebSocket 服务端。
     * 用于维持长连接有效性。
     */
    private void sendPing() {
        try {
            if (webSocketClient != null && webSocketClient.isOpen()) {
                JSONObject ping = new JSONObject();
                ping.put("op", "ping");
                webSocketClient.send(ping.toJSONString());
                log.debug("发送ping请求");
            }
        } catch (Exception e) {
            log.warn("发送ping失败", e);
        }
    }

    /**
     * 取消当前的心跳超时任务。
     * 在收到 pong 或其他有效消息时调用此方法避免不必要的断开重连。
     */
    private synchronized void cancelPongTimeout() {
        if (pongTimeoutFuture != null && !pongTimeoutFuture.isDone()) {
            pongTimeoutFuture.cancel(true);
        }
    }

    /**
     * 执行 WebSocket 重连操作。
     * 在连接意外中断后尝试重新建立连接。
     */
    private void reconnectWithBackoff() throws InterruptedException {
        int attempt = 0;
        int maxAttempts = 5;
        long delayMs = 5000;

        while (attempt < maxAttempts) {
            try {
                Thread.sleep(delayMs);
                connect();
                return;
            } catch (Exception e) {
                log.warn("第{}次重连失败", attempt + 1, e);
                delayMs *= 2;
                attempt++;
            }
        }

        log.error("超过最大重试次数({})仍未连接成功", maxAttempts);
    }
}