package com.ruoyi.monitor.service.impl;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import com.ruoyi.monitor.service.IAlertService;

/**
 * 告警服务实现类
 * 
 * @author ruoyi
 * @date 2025-12-19
 */
@Service
public class AlertServiceImpl implements IAlertService 
{
    private static final Logger log = LoggerFactory.getLogger(AlertServiceImpl.class);

    // 告警配置
    private Map<String, Object> alertConfig = new ConcurrentHashMap<>();
    
    // 告警历史记录
    private List<Map<String, Object>> alertHistory = new ArrayList<>();
    
    // 告警状态跟踪
    private Map<String, Boolean> alertStatus = new ConcurrentHashMap<>();

    public AlertServiceImpl() {
        // 初始化默认告警配置
        initDefaultAlertConfig();
    }

    /**
     * 发送告警通知
     */
    @Override
    public void sendAlert(String alertType, String level, String message, Map<String, Object> details)
    {
        try {
            // 检查是否已经发送过相同类型的告警
            String alertKey = alertType + "_" + level;
            if (alertStatus.getOrDefault(alertKey, false)) {
                log.debug("告警 {} 已经发送过，跳过重复发送", alertKey);
                return;
            }

            // 创建告警记录
            Map<String, Object> alert = new HashMap<>();
            alert.put("type", alertType);
            alert.put("level", level);
            alert.put("message", message);
            alert.put("details", details);
            alert.put("time", new Date());
            alert.put("status", "SENT");

            // 记录告警历史
            alertHistory.add(alert);
            
            // 标记告警状态
            alertStatus.put(alertKey, true);

            // 实际发送告警通知（这里可以集成邮件、短信、钉钉等通知方式）
            sendAlertNotification(alert);

            log.info("告警通知已发送: {} - {} - {}", alertType, level, message);

        } catch (Exception e) {
            log.error("发送告警通知失败: {}", e.getMessage(), e);
        }
    }

    /**
     * 批量发送告警通知
     */
    @Override
    public void sendBatchAlerts(List<Map<String, Object>> alerts)
    {
        for (Map<String, Object> alert : alerts) {
            String alertType = (String) alert.get("type");
            String level = (String) alert.get("level");
            String message = (String) alert.get("message");
            @SuppressWarnings("unchecked")
            Map<String, Object> details = (Map<String, Object>) alert.get("details");
            
            sendAlert(alertType, level, message, details);
        }
    }

    /**
     * 检查告警规则
     */
    @Override
    public boolean checkAlertRule(String metricType, double value)
    {
        @SuppressWarnings("unchecked")
        Map<String, Double> thresholds = (Map<String, Double>) alertConfig.get("thresholds");
        
        if (thresholds == null) {
            return false;
        }

        Double threshold = thresholds.get(metricType);
        if (threshold == null) {
            return false;
        }

        return value > threshold;
    }

    /**
     * 获取告警配置
     */
    @Override
    public Map<String, Object> getAlertConfig()
    {
        return new HashMap<>(alertConfig);
    }

    /**
     * 更新告警配置
     */
    @Override
    public void updateAlertConfig(Map<String, Object> config)
    {
        alertConfig.putAll(config);
        log.info("告警配置已更新: {}", config);
    }

    /**
     * 获取告警历史
     */
    @Override
    public List<Map<String, Object>> getAlertHistory(Map<String, Object> params)
    {
        // 简化实现，返回所有历史记录
        // 实际应该根据参数进行过滤和分页
        return new ArrayList<>(alertHistory);
    }

    /**
     * 处理告警恢复
     */
    @Override
    public void handleAlertRecovery(String alertType, String message)
    {
        try {
            // 清除告警状态
            alertStatus.entrySet().removeIf(entry -> entry.getKey().startsWith(alertType));

            // 记录恢复事件
            Map<String, Object> recovery = new HashMap<>();
            recovery.put("type", alertType);
            recovery.put("level", "INFO");
            recovery.put("message", "告警恢复: " + message);
            recovery.put("time", new Date());
            recovery.put("status", "RECOVERED");

            alertHistory.add(recovery);

            log.info("告警恢复: {} - {}", alertType, message);

        } catch (Exception e) {
            log.error("处理告警恢复失败: {}", e.getMessage(), e);
        }
    }

    /**
     * 初始化默认告警配置
     */
    private void initDefaultAlertConfig()
    {
        Map<String, Double> thresholds = new HashMap<>();
        thresholds.put("CPU_USAGE", 80.0);
        thresholds.put("MEMORY_USAGE", 85.0);
        thresholds.put("DISK_USAGE", 90.0);
        thresholds.put("THREAD_COUNT", 1000.0);
        thresholds.put("GC_TIME", 5000.0);

        alertConfig.put("thresholds", thresholds);
        alertConfig.put("enabled", true);
        alertConfig.put("cooldownMinutes", 5); // 告警冷却时间
        
        List<String> notificationChannels = new ArrayList<>();
        notificationChannels.add("EMAIL");
        notificationChannels.add("SMS");
        alertConfig.put("notificationChannels", notificationChannels);
    }

    /**
     * 发送告警通知（实际通知逻辑）
     */
    private void sendAlertNotification(Map<String, Object> alert)
    {
        // 这里应该实现实际的通知发送逻辑
        // 例如：发送邮件、短信、钉钉消息等
        
        @SuppressWarnings("unchecked")
        List<String> channels = (List<String>) alertConfig.get("notificationChannels");
        
        if (channels != null) {
            for (String channel : channels) {
                switch (channel) {
                    case "EMAIL":
                        sendEmailNotification(alert);
                        break;
                    case "SMS":
                        sendSmsNotification(alert);
                        break;
                    case "DINGTALK":
                        sendDingTalkNotification(alert);
                        break;
                    default:
                        log.warn("不支持的通知渠道: {}", channel);
                }
            }
        }
    }

    /**
     * 发送邮件通知
     */
    private void sendEmailNotification(Map<String, Object> alert)
    {
        // 邮件发送逻辑
        log.info("发送邮件告警通知: {}", alert.get("message"));
    }

    /**
     * 发送短信通知
     */
    private void sendSmsNotification(Map<String, Object> alert)
    {
        // 短信发送逻辑
        log.info("发送短信告警通知: {}", alert.get("message"));
    }

    /**
     * 发送钉钉通知
     */
    private void sendDingTalkNotification(Map<String, Object> alert)
    {
        // 钉钉消息发送逻辑
        log.info("发送钉钉告警通知: {}", alert.get("message"));
    }
}