package com.zksy.manhole.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;

import java.util.Date;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * 设备离线检测定时任务
 * 通过 REST API 更新设备在线状态
 */
@Component
public class DeviceOfflineCheckTask {
    private static final Logger logger = LoggerFactory.getLogger(DeviceOfflineCheckTask.class);

    /** 设备最后接收数据时间 */
    public static ConcurrentHashMap<String, Date> deviceLastReceiveTimeMap = new ConcurrentHashMap<>();

    /** 已知离线设备集合，用于避免重复API调用 */
    private final Set<String> offlineDeviceSet = ConcurrentHashMap.newKeySet();

    @Autowired
    private RestTemplate restTemplate;

    /** 离线判定超时，单位：分钟，默认30分钟 */
    @Value("${device.offline.timeout-minutes:30}")
    private int offlineTimeoutMinutes;

    /** 检查间隔，单位：毫秒，默认5分钟 */
    @Scheduled(fixedRateString = "${device.offline.check-interval-ms:300000}")
    public void checkDeviceOffline() {
        Date now = new Date();
        long timeoutMs = (long) offlineTimeoutMinutes * 60 * 1000;
        for (Map.Entry<String, Date> entry : deviceLastReceiveTimeMap.entrySet()) {
            long diff = now.getTime() - entry.getValue().getTime();
            if (diff > timeoutMs) {
                // 只在设备不在离线集合中时才调用API
                if (offlineDeviceSet.add(entry.getKey())) {
                    updateDeviceOnlineStatus(entry.getKey(), 0);
                    logger.info("设备 {} 已离线（超过{}分钟未收到数据）", entry.getKey(), offlineTimeoutMinutes);
                }
            }
        }
    }

    /**
     * 标记设备在线（收到数据时调用）
     * 只在设备当前处于离线状态时才调用API
     */
    public void markDeviceOnline(String deviceCode) {
        if (offlineDeviceSet.remove(deviceCode)) {
            updateDeviceOnlineStatus(deviceCode, 1);
            logger.info("设备 {} 恢复在线", deviceCode);
        }
    }

    private void updateDeviceOnlineStatus(String deviceCode, int onlineStatus) {
        try {
            Map<String, Object> params = Map.of("deviceCode", deviceCode, "onlineStatus", onlineStatus);
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
            HttpEntity<Map<String, Object>> request = new HttpEntity<>(params, headers);
            restTemplate.postForObject("http://zk-api-service/equipmentStatus/updateOnlineStatus", request, Map.class);
        } catch (Exception e) {
            logger.error("更新设备在线状态失败: deviceCode={}, onlineStatus={}", deviceCode, onlineStatus, e);
        }
    }
}