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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.views.search.elasticsearch;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;
import com.google.auto.value.AutoValue;
import com.google.common.base.Strings;
import org.graylog.plugins.views.search.engine.BackendQuery;

import javax.annotation.Nullable;
import javax.validation.constraints.NotNull;
import java.util.Optional;

@AutoValue
@JsonAutoDetect
@JsonTypeName(ElasticsearchQueryString.NAME)
public abstract class ElasticsearchQueryString implements BackendQuery {

    public static final String NAME = "elasticsearch";

    public static ElasticsearchQueryString empty() {
        return ElasticsearchQueryString.of("");
    }

    @JsonCreator
    public static ElasticsearchQueryString of(final String query) {
        return new AutoValue_ElasticsearchQueryString(NAME, query);
    }

    @NotNull
    public static ElasticsearchQueryString ofNullable(@Nullable final String query) {
        return Optional.ofNullable(query).map(ElasticsearchQueryString::of).orElseGet(ElasticsearchQueryString::empty);
    }

    @JsonCreator
    public static ElasticsearchQueryString create(final @JsonProperty("type") String type, final @JsonProperty("query_string") String query) {
        return new AutoValue_ElasticsearchQueryString(type, query);
    }

    @Nullable
    @Override
    public abstract String type();

    @JsonProperty
    @Override
    public abstract String queryString();

    @JsonIgnore
    public boolean isEmpty() {
        String trimmed = queryString().trim();
        return trimmed.equals("") || trimmed.equals("*");
    }

    public ElasticsearchQueryString concatenate(ElasticsearchQueryString other) {
        final String thisQueryString = Strings.nullToEmpty(this.queryString()).trim();
        final String otherQueryString = Strings.nullToEmpty(other.queryString()).trim();

        if (!thisQueryString.isEmpty() && !otherQueryString.isEmpty()) {
            return ElasticsearchQueryString.of("(" + thisQueryString + ") AND (" + otherQueryString + ")");
        }

        return this.queryString().isEmpty() ? other : this;
    }

    @Override
    public String toString() {
        return type() + ": " + queryString();
    }
}