/*
 * 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 com.facebook.presto.orc.metadata;

import com.google.common.collect.ImmutableList;

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

import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;

public class OrcType
{
    public enum OrcTypeKind
    {
        BOOLEAN,

        BYTE,
        SHORT,
        INT,
        LONG,
        DECIMAL,

        FLOAT,
        DOUBLE,

        STRING,
        VARCHAR,
        CHAR,

        BINARY,

        DATE,
        TIMESTAMP,

        LIST,
        MAP,
        STRUCT,
        UNION,
    }

    private final OrcTypeKind orcTypeKind;
    private final List<Integer> fieldTypeIndexes;
    private final List<String> fieldNames;
    private final Optional<Integer> precision;
    private final Optional<Integer> scale;

    public OrcType(OrcTypeKind orcTypeKind, List<Integer> fieldTypeIndexes, List<String> fieldNames, Optional<Integer> precision, Optional<Integer> scale)
    {
        this.orcTypeKind = requireNonNull(orcTypeKind, "typeKind is null");
        this.fieldTypeIndexes = ImmutableList.copyOf(requireNonNull(fieldTypeIndexes, "fieldTypeIndexes is null"));
        if (fieldNames == null || (fieldNames.isEmpty() && !fieldTypeIndexes.isEmpty())) {
            this.fieldNames = null;
        }
        else {
            this.fieldNames = ImmutableList.copyOf(requireNonNull(fieldNames, "fieldNames is null"));
            checkArgument(fieldNames.size() == fieldTypeIndexes.size(), "fieldNames and fieldTypeIndexes have different sizes");
        }
        this.precision = requireNonNull(precision, "precision is null");
        this.scale = requireNonNull(scale, "scale can not be null");
    }

    public OrcTypeKind getOrcTypeKind()
    {
        return orcTypeKind;
    }

    public int getFieldCount()
    {
        return fieldTypeIndexes.size();
    }

    public int getFieldTypeIndex(int field)
    {
        return fieldTypeIndexes.get(field);
    }

    public String getFieldName(int field)
    {
        return fieldNames.get(field);
    }

    public List<String> getFieldNames()
    {
        return fieldNames;
    }

    public Optional<Integer> getPrecision()
    {
        return precision;
    }

    public Optional<Integer> getScale()
    {
        return scale;
    }

    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("orcTypeKind", orcTypeKind)
                .add("fieldTypeIndexes", fieldTypeIndexes)
                .add("fieldNames", fieldNames)
                .toString();
    }
}