/*
 * 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.shardingsphere.infra.metadata.user;

import com.google.common.base.Objects;
import com.google.common.base.Strings;
import lombok.Getter;
import lombok.RequiredArgsConstructor;

/**
 * Grantee.
 */
@RequiredArgsConstructor
public final class Grantee {
    
    @Getter
    private final String username;
    
    private final String hostname;
    
    @Override
    public boolean equals(final Object obj) {
        if (obj instanceof Grantee) {
            Grantee grantee = (Grantee) obj;
            return grantee.username.equalsIgnoreCase(username) && isPermittedHost(grantee);
        }
        return false;
    }
    
    private boolean isPermittedHost(final Grantee grantee) {
        return grantee.hostname.equalsIgnoreCase(hostname) || isUnlimitedHost();
    }
    
    private boolean isUnlimitedHost() {
        return Strings.isNullOrEmpty(hostname) || "%".equals(hostname);
    }
    
    /**
     * Get host name.
     * @return host name
     */
    public String getHostname() {
        return Strings.isNullOrEmpty(hostname) ? "%" : hostname;
    }
    
    @Override
    public int hashCode() {
        return isUnlimitedHost() ? Objects.hashCode(username.toUpperCase()) : Objects.hashCode(username.toUpperCase(), hostname.toUpperCase());
    }
    
    @Override
    public String toString() {
        return String.format("%s@%s", username, hostname);
    }
}
