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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.plugin.hive;

import com.google.common.collect.ImmutableList;
import io.trino.hive.thrift.metastore.StorageDescriptor;
import io.trino.plugin.hive.metastore.SortingColumn;
import io.trino.spi.TrinoException;

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

import static com.google.common.collect.ImmutableList.toImmutableList;
import static io.trino.plugin.hive.HiveErrorCode.HIVE_INVALID_METADATA;
import static java.util.Locale.ENGLISH;
import static java.util.Objects.requireNonNull;

public record HiveBucketProperty(
        List bucketedBy,
        int bucketCount,
        List sortedBy)
{
    public HiveBucketProperty
    {
        bucketedBy = ImmutableList.copyOf(requireNonNull(bucketedBy, "bucketedBy is null"));
        sortedBy = ImmutableList.copyOf(requireNonNull(sortedBy, "sortedBy is null"));
    }

    public static Optional fromStorageDescriptor(StorageDescriptor storageDescriptor, String tablePartitionName)
    {
        boolean bucketColsSet = storageDescriptor.isSetBucketCols() && !storageDescriptor.getBucketCols().isEmpty();
        boolean numBucketsSet = storageDescriptor.isSetNumBuckets() && storageDescriptor.getNumBuckets() > 0;
        if (!numBucketsSet) {
            // In Hive, a table is considered as not bucketed when its bucketCols is set but its numBucket is not set.
            return Optional.empty();
        }
        if (!bucketColsSet) {
            throw new TrinoException(HIVE_INVALID_METADATA, "Table/partition metadata has 'numBuckets' set, but 'bucketCols' is not set: " + tablePartitionName);
        }
        List sortedBy = ImmutableList.of();
        if (storageDescriptor.isSetSortCols()) {
            sortedBy = storageDescriptor.getSortCols().stream()
                    .map(order -> SortingColumn.fromMetastoreApiOrder(order, tablePartitionName))
                    .collect(toImmutableList());
        }
        List bucketColumnNames = storageDescriptor.getBucketCols().stream()
                // Ensure that the names used for the bucket columns are specified in lower case to match the names of the table columns
                .map(name -> name.toLowerCase(ENGLISH))
                .collect(toImmutableList());
        return Optional.of(new HiveBucketProperty(bucketColumnNames, storageDescriptor.getNumBuckets(), sortedBy));
    }
}