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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.cassandra.cql3.statements;

import org.apache.cassandra.auth.Permission;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.ViewDefinition;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.cql3.CFName;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.exceptions.UnauthorizedException;
import org.apache.cassandra.schema.KeyspaceMetadata;
import org.apache.cassandra.service.ClientState;
import org.apache.cassandra.service.MigrationManager;
import org.apache.cassandra.service.QueryState;
import org.apache.cassandra.transport.Event;

public class DropTableStatement extends SchemaAlteringStatement
{
    private final boolean ifExists;

    public DropTableStatement(CFName name, boolean ifExists)
    {
        super(name);
        this.ifExists = ifExists;
    }

    public void checkAccess(ClientState state) throws UnauthorizedException, InvalidRequestException
    {
        try
        {
            state.hasColumnFamilyAccess(keyspace(), columnFamily(), Permission.DROP);
        }
        catch (InvalidRequestException e)
        {
            if (!ifExists)
                throw e;
        }
    }

    public void validate(ClientState state)
    {
        // validated in announceMigration()
    }

    public Event.SchemaChange announceMigration(QueryState queryState, boolean isLocalOnly) throws ConfigurationException
    {
    	CFMetaData cfm = dropTable(Schema.instance.getKSMetaData(keyspace()));
    	if (cfm != null)
    	{
    		MigrationManager.announceColumnFamilyDrop(keyspace(), columnFamily(), isLocalOnly);
            return new Event.SchemaChange(Event.SchemaChange.Change.DROPPED, Event.SchemaChange.Target.TABLE, keyspace(), columnFamily());
    	}
    	return null;
    }

    public CFMetaData dropTable(KeyspaceMetadata ksm) throws ConfigurationException
    {
    	try
        {
	    	if (ksm == null)
	            throw new ConfigurationException(String.format("Cannot drop table in unknown keyspace '%s'", keyspace()));

	        CFMetaData cfm = ksm.getTableOrViewNullable(columnFamily());
	        if (cfm != null)
	        {
	            if (cfm.isView())
	                throw new InvalidRequestException("Cannot use DROP TABLE on Materialized View");

	            boolean rejectDrop = false;
	            StringBuilder messageBuilder = new StringBuilder();
	            for (ViewDefinition def : ksm.views)
	            {
	                if (def.baseTableId.equals(cfm.cfId))
	                {
	                    if (rejectDrop)
	                        messageBuilder.append(',');
	                    rejectDrop = true;
	                    messageBuilder.append(def.viewName);
	                }
	            }
	            if (rejectDrop)
	            {
	                throw new InvalidRequestException(String.format("Cannot drop table when materialized views still depend on it (%s.{%s})",
	                                                                keyspace(),
	                                                                messageBuilder.toString()));
	            }
	        }
	        return cfm;
        }
        catch (ConfigurationException e)
        {
            if (ifExists)
                return null;
            throw e;
        }
    }
}