/*
 * 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.action.ingest;

import org.opensearch.Version;
import org.opensearch.action.ActionRequest;
import org.opensearch.action.ActionRequestValidationException;
import org.opensearch.core.common.bytes.BytesReference;
import org.opensearch.core.common.io.stream.StreamInput;
import org.opensearch.core.common.io.stream.StreamOutput;
import org.opensearch.common.logging.DeprecationLogger;
import org.opensearch.common.xcontent.XContentType;
import org.opensearch.core.xcontent.MediaType;
import org.opensearch.core.xcontent.ToXContentObject;
import org.opensearch.core.xcontent.XContentBuilder;
import org.opensearch.index.VersionType;
import org.opensearch.ingest.ConfigurationUtils;
import org.opensearch.ingest.IngestDocument;
import org.opensearch.ingest.IngestDocument.Metadata;
import org.opensearch.ingest.IngestService;
import org.opensearch.ingest.Pipeline;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Objects;

/**
 * transport request to simulate a pipeline
 *
 * @opensearch.internal
 */
public class SimulatePipelineRequest extends ActionRequest implements ToXContentObject {

    private static final DeprecationLogger deprecationLogger = DeprecationLogger.getLogger(SimulatePipelineRequest.class);
    private String id;
    private boolean verbose;
    private BytesReference source;
    private MediaType mediaType;

    /**
     * Creates a new request with the given source and its content type
     */
    public SimulatePipelineRequest(BytesReference source, MediaType mediaType) {
        this.source = Objects.requireNonNull(source);
        this.mediaType = Objects.requireNonNull(mediaType);
    }

    SimulatePipelineRequest() {}

    SimulatePipelineRequest(StreamInput in) throws IOException {
        super(in);
        id = in.readOptionalString();
        verbose = in.readBoolean();
        source = in.readBytesReference();
        if (in.getVersion().onOrAfter(Version.V_2_10_0)) {
            mediaType = in.readMediaType();
        } else {
            mediaType = in.readEnum(XContentType.class);
        }
    }

    @Override
    public ActionRequestValidationException validate() {
        return null;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public boolean isVerbose() {
        return verbose;
    }

    public void setVerbose(boolean verbose) {
        this.verbose = verbose;
    }

    public BytesReference getSource() {
        return source;
    }

    public MediaType getXContentType() {
        return mediaType;
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        super.writeTo(out);
        out.writeOptionalString(id);
        out.writeBoolean(verbose);
        out.writeBytesReference(source);
        if (out.getVersion().onOrAfter(Version.V_2_10_0)) {
            mediaType.writeTo(out);
        } else {
            out.writeEnum((XContentType) mediaType);
        }
    }

    @Override
    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
        builder.rawValue(source.streamInput(), mediaType);
        return builder;
    }

    /**
     * Fields for parsing and toXContent
     *
     * @opensearch.internal
     */
    public static final class Fields {
        static final String PIPELINE = "pipeline";
        static final String DOCS = "docs";
        static final String SOURCE = "_source";
    }

    static class Parsed {
        private final List<IngestDocument> documents;
        private final Pipeline pipeline;
        private final boolean verbose;

        Parsed(Pipeline pipeline, List<IngestDocument> documents, boolean verbose) {
            this.pipeline = pipeline;
            this.documents = Collections.unmodifiableList(documents);
            this.verbose = verbose;
        }

        public Pipeline getPipeline() {
            return pipeline;
        }

        public List<IngestDocument> getDocuments() {
            return documents;
        }

        public boolean isVerbose() {
            return verbose;
        }
    }

    static final String SIMULATED_PIPELINE_ID = "_simulate_pipeline";

    static Parsed parseWithPipelineId(String pipelineId, Map<String, Object> config, boolean verbose, IngestService ingestService) {
        if (pipelineId == null) {
            throw new IllegalArgumentException("param [pipeline] is null");
        }
        Pipeline pipeline = ingestService.getPipeline(pipelineId);
        if (pipeline == null) {
            throw new IllegalArgumentException("pipeline [" + pipelineId + "] does not exist");
        }
        List<IngestDocument> ingestDocumentList = parseDocs(config);
        return new Parsed(pipeline, ingestDocumentList, verbose);
    }

    static Parsed parse(Map<String, Object> config, boolean verbose, IngestService ingestService) throws Exception {
        Map<String, Object> pipelineConfig = ConfigurationUtils.readMap(null, null, config, Fields.PIPELINE);
        Pipeline pipeline = Pipeline.create(
            SIMULATED_PIPELINE_ID,
            pipelineConfig,
            ingestService.getProcessorFactories(),
            ingestService.getScriptService()
        );
        List<IngestDocument> ingestDocumentList = parseDocs(config);
        return new Parsed(pipeline, ingestDocumentList, verbose);
    }

    private static List<IngestDocument> parseDocs(Map<String, Object> config) {
        List<Map<String, Object>> docs = ConfigurationUtils.readList(null, null, config, Fields.DOCS);
        if (docs.isEmpty()) {
            throw new IllegalArgumentException("must specify at least one document in [docs]");
        }
        List<IngestDocument> ingestDocumentList = new ArrayList<>();
        for (Object object : docs) {
            if ((object instanceof Map) == false) {
                throw new IllegalArgumentException("malformed [docs] section, should include an inner object");
            }
            Map<String, Object> dataMap = (Map<String, Object>) object;
            Map<String, Object> document = ConfigurationUtils.readMap(null, null, dataMap, Fields.SOURCE);
            String index = ConfigurationUtils.readStringOrIntProperty(null, null, dataMap, Metadata.INDEX.getFieldName(), "_index");
            String id = ConfigurationUtils.readStringOrIntProperty(null, null, dataMap, Metadata.ID.getFieldName(), "_id");
            String routing = ConfigurationUtils.readOptionalStringOrIntProperty(null, null, dataMap, Metadata.ROUTING.getFieldName());
            Long version = null;
            if (dataMap.containsKey(Metadata.VERSION.getFieldName())) {
                version = (Long) ConfigurationUtils.readObject(null, null, dataMap, Metadata.VERSION.getFieldName());
            }
            VersionType versionType = null;
            if (dataMap.containsKey(Metadata.VERSION_TYPE.getFieldName())) {
                versionType = VersionType.fromString(
                    ConfigurationUtils.readStringProperty(null, null, dataMap, Metadata.VERSION_TYPE.getFieldName())
                );
            }
            IngestDocument ingestDocument = new IngestDocument(index, id, routing, version, versionType, document);
            if (dataMap.containsKey(Metadata.IF_SEQ_NO.getFieldName())) {
                Long ifSeqNo = (Long) ConfigurationUtils.readObject(null, null, dataMap, Metadata.IF_SEQ_NO.getFieldName());
                ingestDocument.setFieldValue(Metadata.IF_SEQ_NO.getFieldName(), ifSeqNo);
            }
            if (dataMap.containsKey(Metadata.IF_PRIMARY_TERM.getFieldName())) {
                Long ifPrimaryTerm = (Long) ConfigurationUtils.readObject(null, null, dataMap, Metadata.IF_PRIMARY_TERM.getFieldName());
                ingestDocument.setFieldValue(Metadata.IF_PRIMARY_TERM.getFieldName(), ifPrimaryTerm);
            }
            ingestDocumentList.add(ingestDocument);
        }
        return ingestDocumentList;
    }
}