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/*
 * 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.rpc.model;

import org.apache.dubbo.common.utils.ReflectUtils;

import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.stream.Stream;

import static org.apache.dubbo.common.constants.CommonConstants.$INVOKE;
import static org.apache.dubbo.common.constants.CommonConstants.$INVOKE_ASYNC;

/**
 *
 */
public class MethodDescriptor {
    private final Method method;
    //    private final boolean isCallBack;
//    private final boolean isFuture;
    private final String paramDesc;
    // duplicate filed as paramDesc, but with different format.
    private final String[] compatibleParamSignatures;
    private final Class[] parameterClasses;
    private final Class returnClass;
    private final Type[] returnTypes;
    private final String methodName;
    private final boolean generic;

    public MethodDescriptor(Method method) {
        this.method = method;
        this.parameterClasses = method.getParameterTypes();
        this.returnClass = method.getReturnType();
        this.returnTypes = ReflectUtils.getReturnTypes(method);
        this.paramDesc = ReflectUtils.getDesc(parameterClasses);
        this.compatibleParamSignatures = Stream.of(parameterClasses)
                .map(Class::getName)
                .toArray(String[]::new);
        this.methodName = method.getName();
        this.generic = (methodName.equals($INVOKE) || methodName.equals($INVOKE_ASYNC)) && parameterClasses.length == 3;
    }

    public boolean matchParams (String params) {
        return paramDesc.equalsIgnoreCase(params);
    }

    public Method getMethod() {
        return method;
    }

    public String getParamDesc() {
        return paramDesc;
    }

    public String[] getCompatibleParamSignatures() {
        return compatibleParamSignatures;
    }

    public Class[] getParameterClasses() {
        return parameterClasses;
    }

    public Class getReturnClass() {
        return returnClass;
    }

    public Type[] getReturnTypes() {
        return returnTypes;
    }

    public String getMethodName() {
        return methodName;
    }

    public boolean isGeneric() {
        return generic;
    }

}