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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.graylog.plugins.threatintel.functions.otx;

import com.google.common.collect.ForwardingMap;
import com.google.common.collect.ImmutableMap;
import org.graylog2.plugin.lookup.LookupResult;

import java.util.Map;

public class OTXLookupResult extends ForwardingMap {
    public static final String MESSAGE = "message";
    public static final String HAS_ERROR = "has_error";
    public static final String OTX_THREAT_INDICATED = "otx_threat_indicated";
    private final ImmutableMap results;

    protected static final OTXLookupResult EMPTY = new EmptyOTXLookupResult();
    protected static final OTXLookupResult FALSE = new FalseOTXLookupResult();

    public static OTXLookupResult buildFromError(LookupResult lookupResult) {
        return new FalseOTXLookupResult((String) lookupResult.singleValue());
    }

    public OTXLookupResult(ImmutableMap fields) {
        this.results = fields;
    }

    public Map getResults() {
        return results;
    }

    public boolean hasError() {
        if (results != null && !results.isEmpty()) {
            return (results.get(HAS_ERROR) != null);
        }
        return false;
    }

    @Override
    protected Map delegate() {
        return getResults();
    }

    private static class FalseOTXLookupResult extends OTXLookupResult {
        private static final ImmutableMap EMPTY = ImmutableMap.builder()
                .put(OTX_THREAT_INDICATED, false)
                .build();

        private FalseOTXLookupResult() {
            super(EMPTY);
        }

        private FalseOTXLookupResult(String errMsg) {
            super(ImmutableMap.builder()
                    .put(OTX_THREAT_INDICATED, false)
                    .put(HAS_ERROR, true)
                    .put(MESSAGE, errMsg)
                    .build());
        }
    }

    private static class EmptyOTXLookupResult extends OTXLookupResult {
        private static final ImmutableMap EMPTY = ImmutableMap.builder().build();

        private EmptyOTXLookupResult() {
            super(EMPTY);
        }
    }
}