package com.zksy.audio.service;

import static com.zksy.common.utils.CollectionSideEffects.*;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.zksy.api.domain.AlarmData;
import com.zksy.api.domain.WarningThreshold;
import com.zksy.api.service.AlarmDataService;
import com.zksy.api.service.EarlyWarningAutoService;
import com.zksy.api.service.WarningThresholdService;
import com.zksy.audio.domain.NoiseInfo;
import com.zksy.audio.mapper.NoiseInfoMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * 漏失监测告警服务
 * <p>
 * 设备每24小时上传正常或异常录音，单次达到RMS阈值且满足漏损频段即一级告警。
 * 同一录音重传由接收层去重；保留配置多次确认的能力，供其他采样周期使用：
 * <ul>
 *   <li>rms 越限阈值(max_value)、恢复阈值(min_value) 均从 {@code warning_threshold} 表按设备编码获取，与系统现有逻辑一致</li>
 *   <li>alarm-count=1：每份独立录音 rms≥max 且在漏水特征频段 → <b>一级告警及短信</b></li>
 *   <li>alarm-count>1：窗口内累计 N 次确认，次数不足时预警</li>
 *   <li>rms 回落≤min（或不在特征频段）→ 解除预警，重置确认态</li>
 * </ul>
 */
@Slf4j
@Service
public class NoiseLeakAlarmService {
    //rms声音响度
    private static final String LEAK_WARNING_CODE = "WARN-LEAK";
    
    private static final String LEAK_FREQ_CODE = "WARN-LEAK-FREQ";
    private static final String LEAK_WARNING_TYPE = "漏失预警";

    private static final DateTimeFormatter TS_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    /** 已确认状态用于恢复与中间带保持；单次模式下每份独立异常录音均告警。 */
    private final Set<String> confirmedLeakEncode = ConcurrentHashMap.newKeySet();

    @Value("${wlds.leak.freq-min:200.0}")
    private double freqMin;

    @Value("${wlds.leak.freq-max:2000.0}")
    private double freqMax;

    @Value("${wlds.leak.window-minutes:30}")
    private int windowMinutes;

    @Value("${wlds.leak.alarm-count:1}")
    private int alarmCount = 1;

    @Autowired
    private NoiseInfoMapper noiseInfoMapper;

    @Autowired
    private AlarmDataService alarmDataService;

    @Autowired
    private EarlyWarningAutoService earlyWarningAutoService;

    @Autowired
    private WarningThresholdService warningThresholdService;
    @Autowired
    private com.zksy.api.utils.CollectionDeviceNotifier deviceNotifier;

    /**
     * 对一条新入库的噪音数据进行漏失预警/告警评估
     *
     * @param noise 当前噪音数据
     */
    public void evaluate(NoiseInfo noise) {
        if (noise == null || noise.getEncode() == null || noise.getEncode().trim().isEmpty()) {
            log.warn("漏失评估跳过：噪音数据缺少设备编码");
            return;
        }
        String encode = noise.getEncode();

        // 从阈值表获取该设备的漏失阈值（max=越限，min=恢复）
        WarningThreshold threshold = queryThreshold(encode, LEAK_WARNING_CODE);
        Double maxValue = threshold != null ? threshold.getMaxValue() : null;
        Double minValue = threshold != null ? threshold.getMinValue() : null;
        if (maxValue == null) {
            log.warn("漏失评估跳过：设备未配置漏失阈值(max_value)，encode={}", encode);
            return;
        }

        // 特征频段：优先取阈值表(WARN-LEAK-FREQ min=下限 max=上限)，未配则回退应用配置
        WarningThreshold freqThreshold = queryThreshold(encode, LEAK_FREQ_CODE);
        double lowerFreq = freqMin;
        double upperFreq = freqMax;
        if (freqThreshold != null && freqThreshold.getMinValue() != null && freqThreshold.getMaxValue() != null
                && freqThreshold.getMinValue() < freqThreshold.getMaxValue()) {
            lowerFreq = freqThreshold.getMinValue();
            upperFreq = freqThreshold.getMaxValue();
        }

        Integer rms = noise.getRms();
        if (rms == null) {
            return;
        }

        if (noise.getCenterFrequency() == null || !Double.isFinite(noise.getCenterFrequency())) {
            throw new IllegalArgumentException("缺少有效音频频率，保留原报警状态");
        }
        boolean freqInBand = noise.getCenterFrequency() != null
                && noise.getCenterFrequency() >= lowerFreq && noise.getCenterFrequency() <= upperFreq;

        // 1) 特征频段消失：漏水特征不再成立，彻底解除
        if (!freqInBand) {
            confirmedLeakEncode.remove(encode);
            run(encode, "告警恢复", () -> alarmDataService.recoverAlarm(encode, LEAK_WARNING_CODE));
            run(encode, "解除预警", () -> earlyWarningAutoService.closeAutoWarning(encode, LEAK_WARNING_CODE, "漏失特征频段消失，解除预警"));
            run(encode, "报警状态恢复", () -> deviceNotifier.updateAlarmStatus(encode, 0));
            return;
        }

        // 2) rms 回落至恢复阈值(≤min)：解除预警并重置确认态
        if (minValue != null && rms <= minValue) {
            confirmedLeakEncode.remove(encode);
            run(encode, "告警恢复", () -> alarmDataService.recoverAlarm(encode, LEAK_WARNING_CODE));
            run(encode, "解除预警", () -> earlyWarningAutoService.closeAutoWarning(encode, LEAK_WARNING_CODE, "rms回落至恢复阈值，解除预警"));
            run(encode, "报警状态恢复", () -> deviceNotifier.updateAlarmStatus(encode, 0));
            return;
        }

        // 3) 中间带（min < rms < max）：保持现状，不做级别变更，避免边界抖动
        if (rms < maxValue) {
            if (confirmedLeakEncode.contains(encode)) {
                run(encode, "报警状态同步", () -> deviceNotifier.updateAlarmStatus(encode, 1));
            }
            return;
        }

        // 单次模式只依赖本次已保存的录音，不再查询历史计数。
        long count = alarmCount == 1 ? 1 : countQualified(encode, maxValue, lowerFreq, upperFreq);
        if (count >= alarmCount) {
            boolean newlyConfirmed = confirmedLeakEncode.add(encode);
            if (alarmCount == 1 || newlyConfirmed) {
                run(encode, "一级漏失告警短信", () -> deviceNotifier.sendLevelOneSms(encode, "漏失报警", "RMS=" + rms));
                if (saveLeakAlarm(encode, rms, count, maxValue, lowerFreq, upperFreq)) {
                    log.info("确认漏失告警: encode={}, 本次确认采用{}份独立采样", encode, count);
                } else {
                    confirmedLeakEncode.remove(encode);
                }
            }
            run(encode, "解除预警", () -> earlyWarningAutoService.closeAutoWarning(encode, LEAK_WARNING_CODE, "已确认漏失，转告警处理"));
            run(encode, "报警状态同步", () -> deviceNotifier.updateAlarmStatus(encode, 1));
        } else {
            confirmedLeakEncode.remove(encode);
            final double lower = lowerFreq, upper = upperFreq;
            run(encode, "疑似漏失预警", () -> earlyWarningAutoService.recordWarning(encode, LEAK_WARNING_TYPE, LEAK_WARNING_CODE, 3,
                    buildWarningContent(encode, count, maxValue, lower, upper)));
        }
    }

    /**
     * 按设备编码与预警编码查询阈值规则
     */
    private WarningThreshold queryThreshold(String encode, String warningCode) {
        return warningThresholdService.getWarningThresholdByDeviceAndCode(encode, warningCode);
    }

    /**
     * 统计指定设备在最近时间窗口内，rms 超过越限阈值且中心频率落在漏失频段的采样次数
     */
    private long countQualified(String encode, Double maxValue, double lowerFreq, double upperFreq) {
        String start = LocalDateTime.now().minusMinutes(windowMinutes).format(TS_FORMATTER);
        return noiseInfoMapper.selectCount(new LambdaQueryWrapper<NoiseInfo>()
                .eq(NoiseInfo::getEncode, encode)
                .ge(NoiseInfo::getTs, start)
                .ge(NoiseInfo::getRms, maxValue)
                .ge(NoiseInfo::getCenterFrequency, lowerFreq)
                .le(NoiseInfo::getCenterFrequency, upperFreq));
    }

    private boolean saveLeakAlarm(String encode, Integer rms, long count, Double maxValue,
                                  double lowerFreq, double upperFreq) {
        AlarmData alarm = new AlarmData();
        alarm.setDeviceCode(encode);
        alarm.setWarningType("漏失报警");
        alarm.setWarningCode(LEAK_WARNING_CODE);
        // 漏失告警只在 alarm_data 中保存 RMS 的越限上限；最小值仅用于恢复判断，不入库。
        if (maxValue != null) {
            alarm.setMaxValue(BigDecimal.valueOf(maxValue));
        }
        if (rms != null) {
            alarm.setActualValue(BigDecimal.valueOf(rms));
        }
        alarm.setAlarmLevel(1);
        alarm.setAlarmStatus(0);
        alarm.setCreateTime(LocalDateTime.now());
        alarm.setRemark(alarmCount == 1
                ? String.format("漏失监测单次独立采样确认：rms≥阈值且在漏失频段[%.0f,%.0f]Hz", lowerFreq, upperFreq)
                : String.format("漏失监测确认漏失：最近%d分钟内%d次采样rms≥阈值且在漏失频段[%.0f,%.0f]Hz",
                    windowMinutes, count, lowerFreq, upperFreq));
        try {
            requireSaved(alarmDataService.saveAlarmData(alarm));
            log.info("漏失告警入库成功: encode={}, count={}", encode, count);
            return true;
        } catch (Exception e) {
            log.error("漏失告警入库失败: encode={}", encode, e);
            return false;
        }
    }

    private String buildWarningContent(String encode, long count, Double maxValue, double lowerFreq, double upperFreq) {
        return String.format("【系统自动预警】设备[%s]疑似漏失：最近%d分钟内%d次采样rms≥%s且中心频率落在漏失频段[%.0f,%.0f]Hz，待确认",
                encode, windowMinutes, count, Objects.toString(maxValue, "-"), lowerFreq, upperFreq);
    }
}