/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.search.suggest;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.util.BytesRef;
import org.opensearch.common.annotation.PublicApi;
import org.opensearch.index.query.QueryShardContext;

import java.util.LinkedHashMap;
import java.util.Map;

/**
 * Context used for suggestion based search
 *
 * @opensearch.api
 */
@PublicApi(since = "1.0.0")
public class SuggestionSearchContext {

    private final Map<String, SuggestionContext> suggestions = new LinkedHashMap<>(4);

    public void addSuggestion(String name, SuggestionContext suggestion) {
        suggestions.put(name, suggestion);
    }

    public Map<String, SuggestionContext> suggestions() {
        return suggestions;
    }

    /**
     * The suggestion context
     *
     * @opensearch.api
     */
    @PublicApi(since = "1.0.0")
    public abstract static class SuggestionContext {

        private BytesRef text;
        private BytesRef prefix;
        private BytesRef regex;
        private String field;
        private Analyzer analyzer;
        private int size = 5;
        private int shardSize = -1;
        private QueryShardContext shardContext;
        private Suggester<?> suggester;

        protected SuggestionContext(Suggester<?> suggester, QueryShardContext shardContext) {
            this.suggester = suggester;
            this.shardContext = shardContext;
        }

        public BytesRef getText() {
            return text;
        }

        public void setText(BytesRef text) {
            this.text = text;
        }

        public BytesRef getPrefix() {
            return prefix;
        }

        public void setPrefix(BytesRef prefix) {
            this.prefix = prefix;
        }

        public BytesRef getRegex() {
            return regex;
        }

        public void setRegex(BytesRef regex) {
            this.regex = regex;
        }

        public Suggester<SuggestionContext> getSuggester() {
            return ((Suggester<SuggestionContext>) suggester);
        }

        public Analyzer getAnalyzer() {
            return analyzer;
        }

        public void setAnalyzer(Analyzer analyzer) {
            this.analyzer = analyzer;
        }

        public String getField() {
            return field;
        }

        public void setField(String field) {
            this.field = field;
        }

        public int getSize() {
            return size;
        }

        public void setSize(int size) {
            if (size <= 0) {
                throw new IllegalArgumentException("Size must be positive but was: " + size);
            }
            this.size = size;
        }

        public Integer getShardSize() {
            return shardSize;
        }

        public void setShardSize(int shardSize) {
            if (shardSize <= 0) {
                throw new IllegalArgumentException("ShardSize must be positive but was: " + shardSize);
            }
            this.shardSize = shardSize;
        }

        public QueryShardContext getShardContext() {
            return this.shardContext;
        }

        @Override
        public String toString() {
            return "["
                + "text="
                + text
                + ",field="
                + field
                + ",prefix="
                + prefix
                + ",regex="
                + regex
                + ",size="
                + size
                + ",shardSize="
                + shardSize
                + ",suggester="
                + suggester
                + ",analyzer="
                + analyzer
                + ",shardContext="
                + shardContext
                + "]";
        }
    }

}
