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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.omid;

import com.google.inject.AbstractModule;
import com.google.inject.Provides;
import org.apache.omid.tools.hbase.HBaseLogin;
import org.apache.omid.tools.hbase.SecureHBaseConfig;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;

import java.io.IOException;

public class HBaseConfigModule extends AbstractModule {

    private String principal;
    private String keytab;

    public HBaseConfigModule(String principal, String keytab) {
        this.principal = principal;
        this.keytab = keytab;
    }

    @Override
    protected void configure() {
    }

    @Provides
    public Configuration provideHBaseConfig() throws IOException {
        Configuration configuration = HBaseConfiguration.create();
        SecureHBaseConfig secureHBaseConfig = new SecureHBaseConfig();
        secureHBaseConfig.setKeytab(keytab);
        secureHBaseConfig.setPrincipal(principal);
        HBaseLogin.loginIfNeeded(secureHBaseConfig);
        return configuration;

    }

    // ----------------------------------------------------------------------------------------------------------------
    // IMPORTANT NOTE
    // Overriding equals() and hashCode() is necessary here to allow this module to be installed multiple times.
    // As example, this module can be installed in a configuration using both the HBase Timestamp & Commit Table stores.
    // ----------------------------------------------------------------------------------------------------------------

    @Override
    public boolean equals(Object o) {

        if (this == o) return true;

        if (o == null || getClass() != o.getClass()) return false;

        HBaseConfigModule that = (HBaseConfigModule) o;

        if (principal != null ? !principal.equals(that.principal) : that.principal != null) return false;
        return keytab != null ? keytab.equals(that.keytab) : that.keytab == null;

    }

    @Override
    public int hashCode() {

        int result = principal != null ? principal.hashCode() : 0;
        result = 31 * result + (keytab != null ? keytab.hashCode() : 0);
        return result;

    }

}