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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.inputs.extractors;

import com.codahale.metrics.MetricRegistry;
import org.graylog2.ConfigurationException;
import org.graylog2.lookup.LookupTableService;
import org.graylog2.plugin.inputs.Converter;
import org.graylog2.plugin.inputs.Extractor;
import org.graylog2.plugin.lookup.LookupResult;

import javax.annotation.Nullable;
import java.util.List;
import java.util.Map;

import static com.google.common.base.Strings.isNullOrEmpty;

public class LookupTableExtractor extends Extractor {
    private final LookupTableService.Function lookupTable;
    public static final String CONFIG_LUT_NAME = "lookup_table_name";

    public LookupTableExtractor(final MetricRegistry metricRegistry,
                                final LookupTableService lookupTableService,
                                final String id,
                                final String title,
                                final long order,
                                final CursorStrategy cursorStrategy,
                                final String sourceField,
                                final String targetField,
                                final Map extractorConfig,
                                final String creatorUserId,
                                final List converters,
                                final ConditionType conditionType,
                                final String conditionValue) throws ReservedFieldException, ConfigurationException {
        super(metricRegistry, id, title, order, Type.LOOKUP_TABLE, cursorStrategy, sourceField, targetField, extractorConfig, creatorUserId, converters, conditionType, conditionValue);

        final String lookupTableName = (String) extractorConfig.get(CONFIG_LUT_NAME);
        if (isNullOrEmpty(lookupTableName)) {
            throw new ConfigurationException("Missing lookup table extractor configuration field: " + CONFIG_LUT_NAME);
        }

        if (!lookupTableService.hasTable(lookupTableName)) {
            throw new IllegalStateException("Configured lookup table <" + lookupTableName + "> doesn't exist");
        }

        this.lookupTable = lookupTableService.newBuilder().lookupTable(lookupTableName).build();
    }

    @Override
    @Nullable
    protected Result[] run(String sourceFieldValue) {
        final LookupResult result = lookupTable.lookup(sourceFieldValue);

        if (result == null || result.isEmpty()) {
            return null;
        }

        final Object value = result.singleValue();
        if (value == null) {
            return null;
        }

        return new Result[]{ new Result(value, targetField, -1, -1) };
    }
}