package com.usthe.alert.calculate;

import com.googlecode.aviator.AviatorEvaluator;
import com.googlecode.aviator.Expression;
import com.usthe.alert.AlerterWorkerPool;
import com.usthe.alert.AlerterDataQueue;
import com.usthe.alert.dao.AlertMonitorDao;
import com.usthe.common.entity.alerter.Alert;
import com.usthe.common.entity.alerter.AlertDefine;
import com.usthe.alert.service.AlertDefineService;
import com.usthe.alert.util.AlertTemplateUtil;
import com.usthe.collector.dispatch.export.MetricsDataExporter;
import com.usthe.common.entity.manager.Monitor;
import com.usthe.common.entity.message.CollectRep;
import com.usthe.common.util.CommonConstants;
import com.usthe.common.util.CommonUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * 根据告警定义规则和采集数据匹配计算告警
 * @author tom
 * @date 2021/12/9 14:19
 */
@Configuration
@Slf4j
public class CalculateAlarm {

    private AlerterWorkerPool workerPool;
    private AlerterDataQueue dataQueue;
    private MetricsDataExporter dataExporter;
    private AlertDefineService alertDefineService;
    private Map<String, Alert> triggeredAlertMap;
    private Map<Long, CollectRep.Code> triggeredMonitorStateAlertMap;

    public CalculateAlarm (AlerterWorkerPool workerPool, AlerterDataQueue dataQueue,
                           AlertDefineService alertDefineService, MetricsDataExporter dataExporter,
                           AlertMonitorDao monitorDao) {
        this.workerPool = workerPool;
        this.dataQueue = dataQueue;
        this.dataExporter = dataExporter;
        this.alertDefineService = alertDefineService;
        this.triggeredAlertMap = new ConcurrentHashMap<>(128);
        this.triggeredMonitorStateAlertMap = new ConcurrentHashMap<>(128);
        // 初始化stateAlertMap
        List<Monitor> monitors = monitorDao.findMonitorsByStatusIn(Arrays.asList((byte)2, (byte)3));
        if (monitors != null) {
            for (Monitor monitor : monitors) {
                this.triggeredMonitorStateAlertMap.put(monitor.getId(), CollectRep.Code.UN_AVAILABLE);
            }
        }
        startCalculate();
    }

    private void startCalculate() {
        Runnable runnable = () -> {
            while (!Thread.currentThread().isInterrupted()) {
                try {
                    CollectRep.MetricsData metricsData = dataExporter.pollAlertMetricsData();
                    if (metricsData != null) {
                        calculate(metricsData);
                    }
                } catch (InterruptedException e) {
                    log.error(e.getMessage());
                }
            }
        };
        workerPool.executeJob(runnable);
        workerPool.executeJob(runnable);
        workerPool.executeJob(runnable);
    }

    private void calculate(CollectRep.MetricsData metricsData) {
        long monitorId = metricsData.getId();
        String app = metricsData.getApp();
        String metrics = metricsData.getMetrics();
        // 先判断调度优先级为0的指标组采集响应数据状态 UN_REACHABLE/UN_CONNECTABLE 则需发最高级别告警进行监控状态变更
        if (metricsData.getPriority() == 0) {
            if (metricsData.getCode() != CollectRep.Code.SUCCESS) {
                // 采集异常
                Alert.AlertBuilder alertBuilder = Alert.builder()
                        .monitorId(monitorId)
                        .priority(CommonConstants.ALERT_PRIORITY_CODE_EMERGENCY)
                        .status(CommonConstants.ALERT_STATUS_CODE_PENDING)
                        .times(1);
                if (metricsData.getCode() == CollectRep.Code.UN_AVAILABLE) {
                    // 采集器不可用
                    alertBuilder.target(CommonConstants.AVAILABLE)
                            .content("监控紧急可用性告警: " + metricsData.getCode().name());
                    triggeredMonitorStateAlertMap.put(monitorId, CollectRep.Code.UN_AVAILABLE);
                    dataQueue.addAlertData(alertBuilder.build());
                } else if (metricsData.getCode() == CollectRep.Code.UN_REACHABLE) {
                    // UN_REACHABLE 对端不可达(网络层icmp)
                    alertBuilder.target(CommonConstants.REACHABLE)
                            .content("监控紧急可达性告警: " + metricsData.getCode().name());
                    triggeredMonitorStateAlertMap.put(monitorId, CollectRep.Code.UN_REACHABLE);
                    dataQueue.addAlertData(alertBuilder.build());
                } else if (metricsData.getCode() == CollectRep.Code.UN_CONNECTABLE) {
                    // UN_CONNECTABLE 对端连接失败(传输层tcp,udp)
                    alertBuilder.target(CommonConstants.AVAILABLE)
                            .content("监控紧急可用性告警: " + metricsData.getCode().name());
                    triggeredMonitorStateAlertMap.put(monitorId, CollectRep.Code.UN_CONNECTABLE);
                    dataQueue.addAlertData(alertBuilder.build());
                } else {
                    // 其他异常
                    alertBuilder.target(CommonConstants.AVAILABLE)
                            .content("监控紧急可用性告警: " + metricsData.getCode().name());
                    triggeredMonitorStateAlertMap.put(monitorId, metricsData.getCode());
                    dataQueue.addAlertData(alertBuilder.build());
                }
                return;
            } else {
                // 判断关联监控之前是否有可用性或者不可达告警,发送恢复告警进行监控状态恢复
                CollectRep.Code stateCode = triggeredMonitorStateAlertMap.remove(monitorId);
                if (stateCode != null) {
                    // 发送告警恢复
                    Alert resumeAlert = Alert.builder()
                            .monitorId(monitorId)
                            .target(CommonConstants.AVAILABLE)
                            .content("告警恢复通知, 此监控状态已恢复正常")
                            .priority(CommonConstants.ALERT_PRIORITY_CODE_WARNING)
                            .status(CommonConstants.ALERT_STATUS_CODE_RESTORED).build();
                    dataQueue.addAlertData(resumeAlert);
                }
            }
        }
        // 查出此监控类型下的此指标集合下关联配置的告警定义信息
        // field - define[]
        Map<String, List<AlertDefine>> defineMap = alertDefineService.getMonitorBindAlertDefines(monitorId, app, metrics);
        if (defineMap == null || defineMap.isEmpty()) {
            return;
        }
        List<CollectRep.Field> fields = metricsData.getFieldsList();
        Map<String, Object> fieldValueMap = new HashMap<>(16);
        for (CollectRep.ValueRow valueRow : metricsData.getValuesList()) {
            if (!valueRow.getColumnsList().isEmpty()) {
                fieldValueMap.clear();
                String instance = valueRow.getInstance();
                if (!"".equals(instance)) {
                    fieldValueMap.put("instance", instance);
                }
                for (int index = 0; index < valueRow.getColumnsList().size(); index++) {
                    String valueStr = valueRow.getColumns(index);
                    CollectRep.Field field = fields.get(index);
                    if (field.getType() == CommonConstants.TYPE_NUMBER) {
                        Double doubleValue = CommonUtil.parseDoubleStr(valueStr);
                        if (doubleValue != null) {
                            fieldValueMap.put(field.getName(), doubleValue);
                        }
                    } else {
                        if (!"".equals(valueStr)) {
                            fieldValueMap.put(field.getName(), valueStr);
                        }
                    }
                }
                for (Map.Entry<String, List<AlertDefine>> entry : defineMap.entrySet()) {
                    List<AlertDefine> defines = entry.getValue();
                    for (AlertDefine define : defines) {
                        String expr = define.getExpr();
                        try {
                            Expression expression = AviatorEvaluator.compile(expr, true);
                            Boolean match = (Boolean) expression.execute(fieldValueMap);
                            if (match) {
                                // 阈值规则匹配，判断已触发阈值次数，触发告警
                                String monitorAlertKey = String.valueOf(monitorId) + define.getId();
                                Alert triggeredAlert = triggeredAlertMap.get(monitorAlertKey);
                                if (triggeredAlert != null) {
                                    int times = triggeredAlert.getTimes() + 1;
                                    triggeredAlert.setTimes(times);
                                    if (times >= define.getTimes()) {
                                        triggeredAlertMap.remove(monitorAlertKey);
                                        dataQueue.addAlertData(triggeredAlert);
                                    }
                                } else {
                                    int times = 1;
                                    fieldValueMap.put("app", app);
                                    fieldValueMap.put("metrics", metrics);
                                    fieldValueMap.put("metric", define.getField());
                                    Alert alert = Alert.builder()
                                            .monitorId(monitorId)
                                            .alertDefineId(define.getId())
                                            .priority(define.getPriority())
                                            .status(CommonConstants.ALERT_STATUS_CODE_PENDING)
                                            .target(app + "." + metrics + "." + define.getField())
                                            .times(times)
                                            // 模板中关键字匹配替换
                                            .content(AlertTemplateUtil.render(define.getTemplate(), fieldValueMap))
                                            .build();
                                    if (times >= define.getTimes()) {
                                        dataQueue.addAlertData(alert);
                                    } else {
                                        triggeredAlertMap.put(monitorAlertKey, alert);
                                    }
                                }
                                // 此优先级以下的阈值规则则忽略
                                break;
                            }
                        } catch (Exception e) {
                            log.warn(e.getMessage());
                        }
                    }
                }

            }
        }
    }
}