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/*
 * Copyright 2021 Hazelcast Inc.
 *
 * Licensed under the Hazelcast Community License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://hazelcast.com/hazelcast-community-license
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES 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.sql.impl.schema.MappingField;
import com.hazelcast.sql.impl.type.QueryDataType;

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

final class JsonResolver {

    private JsonResolver() {
    }

    static List resolveFields(Map json) {
        Map fields = new LinkedHashMap<>();
        for (Entry entry : json.entrySet()) {
            String name = entry.getKey();
            QueryDataType type = resolveType(entry.getValue());

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

    private static QueryDataType resolveType(Object value) {
        if (value instanceof Boolean) {
            return QueryDataType.BOOLEAN;
        } else if (value instanceof Number) {
            return QueryDataType.DOUBLE;
        } else if (value instanceof String) {
            return QueryDataType.VARCHAR;
        } else {
            return QueryDataType.OBJECT;
        }
    }
}