/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *     http://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.apache.dubbo.metrics.model;

import org.apache.dubbo.metrics.model.sample.MetricSample;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.RpcInvocation;

import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;

import static org.apache.dubbo.common.constants.CommonConstants.GROUP_CHAR_SEPARATOR;
import static org.apache.dubbo.common.constants.CommonConstants.PATH_SEPARATOR;
import static org.apache.dubbo.common.constants.CommonConstants.PROVIDER_SIDE;
import static org.apache.dubbo.common.constants.MetricsConstants.TAG_APPLICATION_NAME;
import static org.apache.dubbo.common.constants.MetricsConstants.TAG_GROUP_KEY;
import static org.apache.dubbo.common.constants.MetricsConstants.TAG_HOSTNAME;
import static org.apache.dubbo.common.constants.MetricsConstants.TAG_INTERFACE_KEY;
import static org.apache.dubbo.common.constants.MetricsConstants.TAG_IP;
import static org.apache.dubbo.common.constants.MetricsConstants.TAG_METHOD_KEY;
import static org.apache.dubbo.common.constants.MetricsConstants.TAG_VERSION_KEY;
import static org.apache.dubbo.common.utils.NetUtils.getLocalHost;
import static org.apache.dubbo.common.utils.NetUtils.getLocalHostName;
import static org.apache.dubbo.metrics.MetricsConstants.INVOCATION_METRICS_COUNTER;
import static org.apache.dubbo.rpc.support.RpcUtils.isGenericCall;

/**
 * Metric class for method.
 */
public class MethodMetric implements Metric {
    private String applicationName;
    private String side;
    private String interfaceName;
    private String methodName;
    private String group;
    private String version;

    private MetricSample.Type sampleType;

    public MethodMetric() {
    }

    public MethodMetric(String applicationName, Invocation invocation) {
        this.applicationName = applicationName;
        this.sampleType = (MetricSample.Type) invocation.get(INVOCATION_METRICS_COUNTER);
        init(invocation);
    }

    public MetricSample.Type getSampleType() {
        return sampleType;
    }

    public String getInterfaceName() {
        return interfaceName;
    }

    public void setInterfaceName(String interfaceName) {
        this.interfaceName = interfaceName;
    }

    public String getMethodName() {
        return methodName;
    }

    public void setMethodName(String methodName) {
        this.methodName = methodName;
    }

    public String getGroup() {
        return group;
    }

    public void setGroup(String group) {
        this.group = group;
    }

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    public Map<String, String> getTags() {
        Map<String, String> tags = new HashMap<>();
        tags.put(TAG_IP, getLocalHost());
        tags.put(TAG_HOSTNAME, getLocalHostName());
        tags.put(TAG_APPLICATION_NAME, applicationName);
        tags.put(TAG_INTERFACE_KEY, interfaceName);
        tags.put(TAG_METHOD_KEY, methodName);
        tags.put(TAG_GROUP_KEY, group);
        tags.put(TAG_VERSION_KEY, version);
        return tags;
    }

    private void init(Invocation invocation) {
        String serviceUniqueName = invocation.getTargetServiceUniqueName();
        String methodName = invocation.getMethodName();
        if (invocation instanceof RpcInvocation
                && isGenericCall(((RpcInvocation) invocation).getParameterTypesDesc(), methodName)
                && invocation.getArguments() != null
                && invocation.getArguments().length == 3) {
            methodName = ((String) invocation.getArguments()[0]).trim();
        }
        String group = null;
        String interfaceAndVersion;
        String[] arr = serviceUniqueName.split(PATH_SEPARATOR);
        if (arr.length == 2) {
            group = arr[0];
            interfaceAndVersion = arr[1];
        } else {
            interfaceAndVersion = arr[0];
        }
        String[] ivArr = interfaceAndVersion.split(GROUP_CHAR_SEPARATOR);
        String interfaceName = ivArr[0];
        String version = ivArr.length == 2 ? ivArr[1] : null;
        Optional<? extends Invoker<?>> invoker = Optional.ofNullable(invocation.getInvoker());
        this.side = invoker.isPresent() ? invoker.get().getUrl().getSide() : PROVIDER_SIDE;
        this.interfaceName = interfaceName;
        this.methodName = methodName;
        this.group = group;
        this.version = version;
    }

    public String getApplicationName() {
        return applicationName;
    }

    public void setApplicationName(String applicationName) {
        this.applicationName = applicationName;
    }

    public String getSide() {
        return side;
    }

    public void setSide(String side) {
        this.side = side;
    }

    @Override
    public String toString() {
        return "MethodMetric{" +
                "applicationName='" + applicationName + '\'' +
                ", side='" + side + '\'' +
                ", interfaceName='" + interfaceName + '\'' +
                ", methodName='" + methodName + '\'' +
                ", group='" + group + '\'' +
                ", version='" + version + '\'' +
                '}';
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        MethodMetric that = (MethodMetric) o;
        return Objects.equals(applicationName, that.applicationName) && Objects.equals(side, that.side) && Objects.equals(interfaceName, that.interfaceName) && Objects.equals(methodName, that.methodName) && Objects.equals(group, that.group) && Objects.equals(version, that.version);
    }

    @Override
    public int hashCode() {
        return Objects.hash(applicationName, side, interfaceName, methodName, group, version);
    }
}
