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/*
 * Copyright 2015 Samppa Saarela
 *
 * 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
 *
 *   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.javersion.reflect;

import java.lang.reflect.Method;
import java.util.List;
import java.util.stream.Collectors;

import javax.annotation.Nonnull;

import org.javersion.util.Check;

import com.google.common.collect.ImmutableList;

public final class MethodSignature {

    @Nonnull
    public final String name;

    @Nonnull
    public final List> parameterTypes;

    public MethodSignature(Method method) {
        this(method.getName(), method.getParameterTypes());
    }

    public MethodSignature(String name, Class... parameterTypes) {
        this(name, ImmutableList.copyOf(parameterTypes));
    }

    public MethodSignature(String name, List> parameterTypes) {
        this.name = Check.notNullOrEmpty(name, "name");
        Check.notNull(parameterTypes, "parameterTypes");
        this.parameterTypes = ImmutableList.copyOf(parameterTypes);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof MethodSignature)) return false;

        MethodSignature that = (MethodSignature) o;

        if (!name.equals(that.name)) return false;
        return parameterTypes.equals(that.parameterTypes);

    }

    @Override
    public int hashCode() {
        int result = name.hashCode();
        result = 31 * result + parameterTypes.hashCode();
        return result;
    }

    public String toString() {
        return name + parameterTypes.stream()
                .map(TypeDescriptor::getSimpleName)
                .collect(Collectors.joining(",", "(", ")"));
    }

}