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/*
 * 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.client.indices;

import org.opensearch.cluster.metadata.ComposableIndexTemplate;
import org.opensearch.core.ParseField;
import org.opensearch.core.xcontent.ConstructingObjectParser;
import org.opensearch.core.xcontent.XContentParser;

import java.io.IOException;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;

public class GetComposableIndexTemplatesResponse {

    public static final ParseField NAME = new ParseField("name");
    public static final ParseField INDEX_TEMPLATES = new ParseField("index_templates");
    public static final ParseField INDEX_TEMPLATE = new ParseField("index_template");

    @SuppressWarnings("unchecked")
    private static final ConstructingObjectParser, Void> PARSER = new ConstructingObjectParser<>(
        "index_templates",
        false,
        a -> ((List) a[0]).stream()
            .collect(Collectors.toMap(n -> n.name, n -> n.indexTemplate, (n1, n2) -> n1, LinkedHashMap::new))
    );

    private static final ConstructingObjectParser INNER_PARSER = new ConstructingObjectParser<>(
        "named_index_template",
        false,
        a -> new NamedIndexTemplate((String) a[0], (ComposableIndexTemplate) a[1])
    );

    static {
        INNER_PARSER.declareString(ConstructingObjectParser.constructorArg(), NAME);
        INNER_PARSER.declareObject(ConstructingObjectParser.constructorArg(), ComposableIndexTemplate.PARSER, INDEX_TEMPLATE);
        PARSER.declareObjectArray(ConstructingObjectParser.constructorArg(), INNER_PARSER, INDEX_TEMPLATES);
    }

    private static class NamedIndexTemplate {
        String name;
        ComposableIndexTemplate indexTemplate;

        private NamedIndexTemplate(String name, ComposableIndexTemplate indexTemplate) {
            this.name = name;
            this.indexTemplate = indexTemplate;
        }
    }

    @Override
    public String toString() {
        return "GetIndexTemplatesResponse [indexTemplates=" + indexTemplates + "]";
    }

    private final Map indexTemplates;

    GetComposableIndexTemplatesResponse(Map indexTemplates) {
        this.indexTemplates = Collections.unmodifiableMap(new LinkedHashMap<>(indexTemplates));
    }

    public Map getIndexTemplates() {
        return indexTemplates;
    }

    public static GetComposableIndexTemplatesResponse fromXContent(XContentParser parser) throws IOException {
        return new GetComposableIndexTemplatesResponse(PARSER.apply(parser, null));
    }

    @Override
    public int hashCode() {
        return Objects.hash(indexTemplates);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        GetComposableIndexTemplatesResponse other = (GetComposableIndexTemplatesResponse) obj;
        return Objects.equals(indexTemplates, other.indexTemplates);
    }

}