/*
 * Copyright (c) 2008-2021, Hazelcast, Inc. All Rights Reserved.
 *
 * 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.hazelcast.jet.sql.impl.connector.file;

import com.hazelcast.jet.sql.impl.schema.MappingField;
import com.hazelcast.sql.impl.type.QueryDataType;
import org.apache.avro.Schema;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

final class AvroResolver {

    private AvroResolver() {
    }

    static List<MappingField> resolveFields(Schema schema) {
        Map<String, MappingField> fields = new LinkedHashMap<>();
        for (Schema.Field avroField : schema.getFields()) {
            String name = avroField.name();
            QueryDataType type = resolveType(avroField.schema().getType());

            MappingField field = new MappingField(name, type);
            fields.putIfAbsent(field.name(), field);
        }
        return new ArrayList<>(fields.values());
    }

    private static QueryDataType resolveType(Schema.Type type) {
        switch (type) {
            case BOOLEAN:
                return QueryDataType.BOOLEAN;
            case INT:
                return QueryDataType.INT;
            case LONG:
                return QueryDataType.BIGINT;
            case FLOAT:
                return QueryDataType.REAL;
            case DOUBLE:
                return QueryDataType.DOUBLE;
            case STRING:
                return QueryDataType.VARCHAR;
            default:
                return QueryDataType.OBJECT;
        }
    }
}
