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/*
 * 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 io.trino.execution;

import com.google.common.util.concurrent.ListenableFuture;
import com.google.inject.Inject;
import io.trino.Session;
import io.trino.execution.warnings.WarningCollector;
import io.trino.metadata.Metadata;
import io.trino.security.AccessControl;
import io.trino.spi.connector.CatalogSchemaName;
import io.trino.sql.tree.Expression;
import io.trino.sql.tree.RenameSchema;

import java.util.List;
import java.util.Optional;

import static com.google.common.util.concurrent.Futures.immediateVoidFuture;
import static io.trino.metadata.MetadataUtil.createCatalogSchemaName;
import static io.trino.spi.StandardErrorCode.SCHEMA_ALREADY_EXISTS;
import static io.trino.spi.StandardErrorCode.SCHEMA_NOT_FOUND;
import static io.trino.sql.analyzer.SemanticExceptions.semanticException;
import static java.util.Objects.requireNonNull;

public class RenameSchemaTask
        implements DataDefinitionTask
{
    private final Metadata metadata;
    private final AccessControl accessControl;

    @Inject
    public RenameSchemaTask(Metadata metadata, AccessControl accessControl)
    {
        this.metadata = requireNonNull(metadata, "metadata is null");
        this.accessControl = requireNonNull(accessControl, "accessControl is null");
    }

    @Override
    public String getName()
    {
        return "RENAME SCHEMA";
    }

    @Override
    public ListenableFuture execute(
            RenameSchema statement,
            QueryStateMachine stateMachine,
            List parameters,
            WarningCollector warningCollector)
    {
        Session session = stateMachine.getSession();
        CatalogSchemaName source = createCatalogSchemaName(session, statement, Optional.of(statement.getSource()));
        CatalogSchemaName target = new CatalogSchemaName(source.getCatalogName(), statement.getTarget().getValue());

        if (!metadata.schemaExists(session, source)) {
            throw semanticException(SCHEMA_NOT_FOUND, statement, "Schema '%s' does not exist", source);
        }

        if (metadata.schemaExists(session, target)) {
            throw semanticException(SCHEMA_ALREADY_EXISTS, statement, "Target schema '%s' already exists", target);
        }

        accessControl.checkCanRenameSchema(session.toSecurityContext(), source, statement.getTarget().getValue());

        metadata.renameSchema(session, source, statement.getTarget().getValue());

        return immediateVoidFuture();
    }
}