package com.hfln.device.application.event;

import com.hfln.device.domain.service.DeviceService;
import com.hfln.device.domain.entity.Device;
import com.hfln.device.domain.event.*;
import com.hfln.device.domain.constant.EventConstants;
import com.hfln.device.domain.gateway.DeviceGateway;
import com.hfln.device.domain.gateway.MqttGateway;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 事件处理器实现类
 * 处理各种设备事件
 */
@Service
@Slf4j
public class EventHandlerImpl implements EventHandler {

    @Autowired
    private DeviceService deviceService;
    
    @Autowired
    private MqttGateway mqttGateway;
    
    @Autowired
    private DeviceGateway deviceGateway;
    
    @Override
    public void handleFallEvent(FallEvent event) {
        log.debug("处理跌倒事件: {}", event);
        String deviceId = event.getDeviceId();
        try {
            Device device = deviceService.getDeviceById(deviceId);
            if (device == null) {
                log.debug("设备不存在: {}", deviceId);
                return;
            }
            device.setLastReportFallTime(event.getTimestamp());
            String fallStatus = event.getFallStatus();
            if (EventConstants.FallStatus.FALL_SUSPECTED.equals(fallStatus)) {
                mqttGateway.sendFallAlarmMessage(deviceId, event.getPose(), event.getTargetPoint());
                deviceGateway.recordFallEvent(deviceId, event.getPose(), event.getTargetPoint());
                log.info("疑似跌倒事件: {}", deviceId);
            } else if (EventConstants.FallStatus.FALL_CONFIRMED.equals(fallStatus)) {
                mqttGateway.sendFallAlarmMessage(deviceId, event.getPose(), event.getTargetPoint());
                deviceGateway.recordFallEvent(deviceId, event.getPose(), event.getTargetPoint());
                log.info("确认跌倒事件: {}", deviceId);
                device.setAlarmAck(false);
                device.setLastAlarmAckTime(event.getTimestamp());
                saveAlarmRecord(device, event);
            } else if (EventConstants.FallStatus.FALL_CANCELED.equals(fallStatus)) {
                List<List<Float>> targets = Collections.singletonList(event.getTargetPoint());
                mqttGateway.sendEventMessage(deviceId, Collections.emptyList(), event.getPose(), targets, fallStatus);
                log.info("取消跌倒事件: {}", deviceId);
            }
            deviceService.updateDevice(device);
        } catch (Exception e) {
            log.error("处理跌倒事件异常: {}", deviceId, e);
        }
    }
    
    @Override
    public void handlePresenceEvent(PresenceEvent event) {
        log.debug("处理存在事件: {}", event);
        String deviceId = event.getDeviceId();
        try {
            Device device = deviceService.getDeviceById(deviceId);
            if (device == null) {
                log.warn("设备不存在: {}", deviceId);
                return;
            }
            String presenceStatus = event.getPresenceStatus();
            if (EventConstants.PresenceStatus.PRESENCE_DETECTED.equals(presenceStatus)) {
                device.setEnterTs(event.getTimestamp());
                device.resetLeaveTs();
                mqttGateway.sendExistenceMessage(deviceId, presenceStatus);
                deviceGateway.recordExistEvent(deviceId, presenceStatus);
                log.info("检测到存在事件: {}", deviceId);
            } else if (EventConstants.PresenceStatus.PRESENCE_LOST.equals(presenceStatus)) {
                device.setLeaveTs(event.getTimestamp());
                device.updateStayTime();
                mqttGateway.sendExistenceMessage(deviceId, presenceStatus);
                deviceGateway.recordExistEvent(deviceId, presenceStatus);
                log.info("存在消失事件: {}, 停留时间: {}秒", deviceId, device.getStayTime() / 1000);
                saveStayTimeRecord(device);
            }
            deviceService.updateDevice(device);
        } catch (Exception e) {
            log.error("处理存在事件异常: {}", deviceId, e);
        }
    }
    
    @Override
    public void handleRetentionEvent(RetentionEvent event) {
        log.debug("处理滞留事件: {}", event);
        String deviceId = event.getDeviceId();
        try {
            Device device = deviceService.getDeviceById(deviceId);
            if (device == null) {
                log.warn("设备不存在: {}", deviceId);
                return;
            }
            String retentionStatus = event.getRetentionStatus();
            if (EventConstants.RetentionStatus.RETENTION_STARTED.equals(retentionStatus)) {
                device.setRetentionTime(event.getStartTimestamp());
                mqttGateway.sendAlarmMessage(deviceId, EventConstants.EventType.RETENTION_EVENT, buildRetentionMessage(event));
                deviceGateway.recordDeviceRetentionAlarm(deviceId, event.getStartTimestamp(), EventConstants.EventType.RETENTION_EVENT, retentionStatus);
                log.info("开始滞留事件: {}", deviceId);
            } else if (EventConstants.RetentionStatus.RETENTION_ONGOING.equals(retentionStatus)) {
                device.setRetentionKeepTime(event.getDuration());
                log.debug("滞留持续事件: {}, 持续时间: {}秒", deviceId, event.getDuration());
            } else if (EventConstants.RetentionStatus.RETENTION_ENDED.equals(retentionStatus)) {
                device.setRetentionTime(null);
                device.setRetentionKeepTime(null);
                mqttGateway.sendAlarmMessage(deviceId, EventConstants.EventType.RETENTION_EVENT, buildRetentionMessage(event));
                deviceGateway.recordDeviceStayTime(deviceId, event.getStartTimestamp(), event.getDuration(), retentionStatus);
                log.info("滞留结束事件: {}", deviceId);
            } else if (EventConstants.RetentionStatus.RETENTION_ALARM.equals(retentionStatus)) {
                String description = "滞留告警: 设备" + deviceId + "滞留时间超过阈值";
                mqttGateway.sendAlarmEventMessage(deviceId, description, "retention_alarm", 0);
                log.info("滞留告警事件: {}, 滞留时间: {}秒", deviceId, event.getDuration());
                device.setAlarmAck(false);
                device.setLastAlarmAckTime(event.getTimestamp());
                saveRetentionAlarmRecord(device, event);
            }
            deviceService.updateDevice(device);
        } catch (Exception e) {
            log.error("处理滞留事件异常: {}", deviceId, e);
        }
    }
    
    private Map<String, Object> buildRetentionMessage(RetentionEvent event) {
        Map<String, Object> message = new HashMap<>();
        message.put("status", event.getRetentionStatus());
        message.put("startTime", event.getStartTimestamp());
        message.put("duration", event.getDuration());
        return message;
    }
    
    @Override
    public void handleAlarmAcknowledgement(String deviceId, Long eventId, String eventType) {
        log.debug("处理告警确认: 设备={}, 事件ID={}, 事件类型={}", deviceId, eventId, eventType);
        
        Device device = deviceService.getDeviceById(deviceId);
        
        if (device == null) {
            log.warn("设备不存在: {}", deviceId);
            return;
        }
        
        // 设置告警已确认
        device.setAlarmAck(true);
        device.setLastAlarmAckTime(System.currentTimeMillis());
        
        // 发送告警确认消息
        mqttGateway.sendAlarmAckMessage(deviceId, eventId);
        log.info("告警已确认: 设备={}, 事件ID={}", deviceId, eventId);
        
        // 更新数据库中的告警记录
        updateAlarmAckStatus(eventId, eventType);
        
        // 更新设备信息
        deviceService.updateDevice(device);
    }
    
    /**
     * 保存告警记录到数据库
     * @param device 设备信息
     * @param event 跌倒事件
     */
    private void saveAlarmRecord(Device device, FallEvent event) {
        // 持久化告警事件到数据库
        deviceGateway.recordAlarmEvent(device.getDevId(), "跌倒告警", "fall_event", 1, event.getTimestamp());
        log.debug("保存跌倒告警记录: {}", event);
    }
    
    /**
     * 保存停留记录到数据库
     * @param device 设备信息
     */
    private void saveStayTimeRecord(Device device) {
        // 持久化停留事件到数据库
        deviceGateway.recordDeviceStayTime(device.getDevId(), device.getEnterTs(), device.getLeaveTs(), "未知区域");
        log.debug("保存停留记录: 设备={}, 进入时间={}, 离开时间={}, 停留时间={}秒",
                device.getDevId(), device.getEnterTs(), device.getLeaveTs(), device.getStayTime() / 1000);
    }
    
    /**
     * 保存滞留告警记录到数据库
     * @param device 设备信息
     * @param event 滞留事件
     */
    private void saveRetentionAlarmRecord(Device device, RetentionEvent event) {
        // 持久化滞留告警到数据库
        deviceGateway.recordDeviceRetentionAlarm(device.getDevId(), event.getTimestamp(), "retention_alarm", "滞留超时");
        log.debug("保存滞留告警记录: {}", event);
    }
    
    /**
     * 更新告警确认状态
     * @param eventId 事件ID
     * @param eventType 事件类型
     */
    private void updateAlarmAckStatus(Long eventId, String eventType) {
        // 更新告警确认状态到数据库
        deviceGateway.updateAlarmAckStatus(eventId, null); // userId可从上下文获取
        log.debug("更新告警确认状态: 事件ID={}, 事件类型={}", eventId, eventType);
    }
}