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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.client.ClientCapabilities;
import io.trino.execution.warnings.WarningCollector;
import io.trino.metadata.Metadata;
import io.trino.spi.TrinoException;
import io.trino.sql.SqlPath;
import io.trino.sql.SqlPathElement;
import io.trino.sql.tree.Expression;
import io.trino.sql.tree.SetPath;

import java.util.List;

import static com.google.common.util.concurrent.Futures.immediateVoidFuture;
import static io.trino.metadata.MetadataUtil.getRequiredCatalogHandle;
import static io.trino.spi.StandardErrorCode.MISSING_CATALOG_NAME;
import static io.trino.spi.StandardErrorCode.NOT_SUPPORTED;
import static io.trino.sql.analyzer.SemanticExceptions.semanticException;
import static java.util.Locale.ENGLISH;
import static java.util.Objects.requireNonNull;

public class SetPathTask
        implements DataDefinitionTask
{
    private final Metadata metadata;

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

    @Override
    public String getName()
    {
        return "SET PATH";
    }

    @Override
    public ListenableFuture execute(
            SetPath statement,
            QueryStateMachine stateMachine,
            List parameters,
            WarningCollector warningCollector)
    {
        Session session = stateMachine.getSession();

        if (!session.getClientCapabilities().contains(ClientCapabilities.PATH.toString())) {
            throw new TrinoException(NOT_SUPPORTED, "SET PATH not supported by client");
        }

        // convert to IR before setting HTTP headers - ensures that the representations of all path objects outside the parser remain consistent
        String rawPath = statement.getPathSpecification().toString();
        for (SqlPathElement element : SqlPath.parsePath(rawPath)) {
            if (element.getCatalog().isEmpty() && session.getCatalog().isEmpty()) {
                throw semanticException(MISSING_CATALOG_NAME, statement, "Catalog must be specified for each path element when session catalog is not set");
            }

            element.getCatalog().ifPresent(catalog -> {
                String catalogName = catalog.getValue().toLowerCase(ENGLISH);
                getRequiredCatalogHandle(metadata, session, statement, catalogName);
            });
        }
        stateMachine.setSetPath(rawPath);
        return immediateVoidFuture();
    }
}