/*************************************************************************
 * Copyright 2009-2012 Eucalyptus Systems, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3 of the License.
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 * You should have received a copy of the GNU General Public License
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 * Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
 * CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
 * additional information or have any questions.
 *
 * This file may incorporate work covered under the following copyright
 * and permission notice:
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 *   Software License Agreement (BSD License)
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 *   Copyright (c) 2008, Regents of the University of California
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package com.eucalyptus.objectstorage.policy;

import org.apache.log4j.Logger;
import net.sf.json.JSONException;
import com.eucalyptus.auth.Contract;
import com.eucalyptus.auth.policy.condition.ConditionOp;
import com.eucalyptus.auth.policy.condition.NumericLessThanEquals;
import com.eucalyptus.auth.policy.key.ContractKey;
import com.eucalyptus.auth.policy.key.KeyUtils;
import com.eucalyptus.auth.policy.key.Keys;
import com.eucalyptus.auth.policy.key.PolicyKey;

@PolicyKey( Keys.S3_MAX_KEYS )
public class MaxKeys extends ContractKey<Long> {

  private static final Logger LOG = Logger.getLogger( MaxKeys.class );
  
  private static final String KEY = Keys.S3_MAX_KEYS;
  
  private static final String ACTION_LISTBUCKET = S3PolicySpec.VENDOR_S3 + ":" + S3PolicySpec.S3_LISTBUCKET;
  private static final String ACTION_LISTBUCKETVERSIONS = S3PolicySpec.VENDOR_S3 + ":" + S3PolicySpec.S3_LISTBUCKETVERSIONS;

  private static final Long DEFAULT = 9999L;
  
  @Override
  public void validateConditionType( Class<? extends ConditionOp> conditionClass ) throws JSONException {
    if ( conditionClass != NumericLessThanEquals.class ) {
      throw new JSONException( KEY + " is not allowed in condition " + conditionClass.getName( ) + ". NumericLessThanEquals is required." );
    }
  }

  @Override
  public void validateValueType( String value ) throws JSONException {
    KeyUtils.validateIntegerValue( value, Keys.S3_MAX_KEYS );
  }

  @Override
  public Contract<Long> getContract( final String[] values ) {
    return new Contract<Long>( ) {
      @Override
      public Contract.Type getType( ) {
        return Contract.Type.MAXKEYS;
      }
      @Override
      public Long getValue( ) {
        try {
          return Long.valueOf( values[0] );
        } catch ( Exception e ) {
          LOG.debug( e, e );
          return DEFAULT;
        }
      }
    };
  }

  @Override
  public boolean canApply( String action ) {
    return ( ACTION_LISTBUCKET.equals( action ) || ACTION_LISTBUCKETVERSIONS.equals( action ) );
  }

  @Override
  public boolean isBetter( Contract<Long> current, Contract<Long> update ) {
    return update.getValue( ) > current.getValue( );
  }

}