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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.search;

import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import com.mongodb.client.model.Filters;
import org.bson.Document;
import org.bson.conversions.Bson;
import org.mongojack.DBQuery;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collectors;

public class SearchQuery {
    private final Multimap queryMap;
    private final Set disallowedKeys;
    private final String queryString;

    public SearchQuery(String queryString) {
        this(queryString, HashMultimap.create(), Collections.emptySet());
    }

    public SearchQuery(String queryString, Multimap queryMap, Set disallowedKeys) {
        this.queryString = queryString;
        this.queryMap = queryMap;
        this.disallowedKeys = disallowedKeys;
    }

    public Multimap getQueryMap() {
        return queryMap;
    }

    public DBQuery.Query toDBQuery() {
        if (queryMap.isEmpty()) {
            return DBQuery.empty();
        }

        final List dbQueries = new ArrayList<>();

        for (Map.Entry> entry : queryMap.asMap().entrySet()) {
            final List queries = new ArrayList<>();

            final List include = selectValues(entry.getValue(), value -> !value.isNegate());
            final List exclude = selectValues(entry.getValue(), SearchQueryParser.FieldValue::isNegate);

            if (!include.isEmpty()) {
                queries.add(DBQuery.or(toQuery(entry.getKey(), include)));
            }
            if (!exclude.isEmpty()) {
                queries.add(DBQuery.nor(toQuery(entry.getKey(), exclude)));
            }

            dbQueries.add(DBQuery.and(queries.toArray(new DBQuery.Query[0])));
        }

        return DBQuery.and(dbQueries.toArray(new DBQuery.Query[0]));
    }

    private DBQuery.Query[] toQuery(String field, List values) {
        return values.stream()
                .map(value -> value.getOperator().buildQuery(field, value.getValue()))
                .collect(Collectors.toList())
                .toArray(new DBQuery.Query[0]);
    }

    public Bson toBson() {
        if (queryMap.isEmpty()) {
            return new Document();
        }
        final List dbQueries = toBsonFilterList();
        return Filters.and(dbQueries);
    }

    public List toBsonFilterList() {
        if (queryMap.isEmpty()) {
            return List.of();
        }
        final List dbQueries = new ArrayList<>();

        for (Map.Entry> entry : queryMap.asMap().entrySet()) {
            final List queries = new ArrayList<>();

            final List include = selectValues(entry.getValue(), value -> !value.isNegate());
            final List exclude = selectValues(entry.getValue(), SearchQueryParser.FieldValue::isNegate);

            if (!include.isEmpty()) {
                queries.add(Filters.or(toBson(entry.getKey(), include)));
            }
            if (!exclude.isEmpty()) {
                queries.add(Filters.nor(toBson(entry.getKey(), exclude)));
            }

            dbQueries.add(Filters.and(queries));
        }
        return dbQueries;
    }

    private List toBson(String field, List values) {
        return values.stream()
                .map(value -> value.getOperator().buildBson(field, value.getValue()))
                .toList();
    }

    private List selectValues(Collection values,
                                                            Function callback) {
        return values.stream()
                .filter(callback::apply)
                .toList();
    }

    public String getQueryString() {
        return queryString;
    }

    public Set getDisallowedKeys() {
        return disallowedKeys;
    }

    public boolean hasDisallowedKeys() {
        return !disallowedKeys.isEmpty();
    }
}