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/*
 * Copyright 2017-2024 noear.org and authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.noear.solon.cloud.metrics.integration;

import io.micrometer.core.instrument.*;
import org.noear.solon.annotation.Mapping;

import java.util.*;

/**
 * 度量基础接口
 *
 * @author noear
 * @since 2.4
 */
public class MetricsController {
    /**
     * 获取所有注册器（类名）
     * */
    @Mapping("/metrics/registrys")
    public Map> registrys() {
        Map> data = new HashMap<>();
        List registrys = new ArrayList<>();

        for (MeterRegistry meterRegistry : Metrics.globalRegistry.getRegistries()) {
            registrys.add(meterRegistry.getClass().getName());
        }

        data.put("_registrys", registrys);
        return data;
    }

    /**
     * 获取所有度量器（名字）
     * */
    @Mapping("/metrics/meters")
    public Map> meters() {
        Map> data = new HashMap<>();
        List meters = new ArrayList<>();

        Metrics.globalRegistry.getMeters().forEach(meter -> {
            meters.add(meter.getId().getName());
        });

        data.put("_meters", meters);
        return data;
    }

    /**
     * 获取度量详情
     * */
    @Mapping("/metrics/meter/{meterName}")
    public Map meter(String meterName) {
        Map meterData = new LinkedHashMap<>();
        meterData.put("name", meterName);

        for (Meter meter : Metrics.globalRegistry.getMeters()) {
            if (meterName.equals(meter.getId().getName())) {
                meterData.put("description", meter.getId().getDescription());
                meterData.put("baseUnit", meter.getId().getBaseUnit());

                Map measurements = new LinkedHashMap<>();
                for (Measurement measure : meter.measure()) {
                    measurements.put(measure.getStatistic().name(), measure.getValue());
                }
                meterData.put("measurements", measurements);

                Map tags = new LinkedHashMap<>();
                for (Tag tag : meter.getId().getTags()) {
                    tags.put(tag.getKey(), tag.getValue());
                }
                meterData.put("tags", tags);

                break;
            }
        }

        return meterData;
    }
}