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/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog 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
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  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 static final String CONFIG_LUT_NAME = "lookup_table_name";
    private final String sourceField;
    private final String targetField;
    private final LookupTableService.Function lookupTable;

    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);

        this.sourceField = sourceField;
        this.targetField = targetField;

        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) };
    }
}