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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.action.ingest;

import org.elasticsearch.Version;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.ingest.IngestDocument;
import org.elasticsearch.ingest.IngestDocument.Metadata;
import org.elasticsearch.xcontent.ConstructingObjectParser;
import org.elasticsearch.xcontent.ParseField;
import org.elasticsearch.xcontent.ToXContentFragment;
import org.elasticsearch.xcontent.XContentBuilder;
import org.elasticsearch.xcontent.XContentParser;

import java.io.IOException;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

import static org.elasticsearch.xcontent.ConstructingObjectParser.constructorArg;
import static org.elasticsearch.xcontent.ConstructingObjectParser.optionalConstructorArg;

final class WriteableIngestDocument implements Writeable, ToXContentFragment {

    static final String SOURCE_FIELD = "_source";
    static final String INGEST_FIELD = "_ingest";
    static final String DOC_FIELD = "doc";
    private final IngestDocument ingestDocument;

    @SuppressWarnings("unchecked")
    public static final ConstructingObjectParser INGEST_DOC_PARSER = new ConstructingObjectParser<>(
        "ingest_document",
        true,
        a -> {
            HashMap sourceAndMetadata = new HashMap<>();
            sourceAndMetadata.put(Metadata.INDEX.getFieldName(), a[0]);
            sourceAndMetadata.put(Metadata.TYPE.getFieldName(), a[1]);
            sourceAndMetadata.put(Metadata.ID.getFieldName(), a[2]);
            if (a[3] != null) {
                sourceAndMetadata.put(Metadata.ROUTING.getFieldName(), a[3]);
            }
            if (a[4] != null) {
                sourceAndMetadata.put(Metadata.VERSION.getFieldName(), a[4]);
            }
            if (a[5] != null) {
                sourceAndMetadata.put(Metadata.VERSION_TYPE.getFieldName(), a[5]);
            }
            sourceAndMetadata.putAll((Map) a[6]);
            return new WriteableIngestDocument(new IngestDocument(sourceAndMetadata, (Map) a[7]));
        }
    );
    static {
        INGEST_DOC_PARSER.declareString(constructorArg(), new ParseField(Metadata.INDEX.getFieldName()));
        INGEST_DOC_PARSER.declareString(constructorArg(), new ParseField(Metadata.TYPE.getFieldName()));
        INGEST_DOC_PARSER.declareString(constructorArg(), new ParseField(Metadata.ID.getFieldName()));
        INGEST_DOC_PARSER.declareString(optionalConstructorArg(), new ParseField(Metadata.ROUTING.getFieldName()));
        INGEST_DOC_PARSER.declareLong(optionalConstructorArg(), new ParseField(Metadata.VERSION.getFieldName()));
        INGEST_DOC_PARSER.declareString(optionalConstructorArg(), new ParseField(Metadata.VERSION_TYPE.getFieldName()));
        INGEST_DOC_PARSER.declareObject(constructorArg(), (p, c) -> p.map(), new ParseField(SOURCE_FIELD));
        INGEST_DOC_PARSER.declareObject(constructorArg(), (p, c) -> {
            Map ingestMap = p.map();
            ingestMap.computeIfPresent("timestamp", (k, o) -> ZonedDateTime.parse((String) o));
            return ingestMap;
        }, new ParseField(INGEST_FIELD));
    }

    public static final ConstructingObjectParser PARSER = new ConstructingObjectParser<>(
        "writeable_ingest_document",
        true,
        a -> (WriteableIngestDocument) a[0]
    );
    static {
        PARSER.declareObject(constructorArg(), INGEST_DOC_PARSER, new ParseField(DOC_FIELD));
    }

    WriteableIngestDocument(IngestDocument ingestDocument) {
        assert ingestDocument != null;
        this.ingestDocument = ingestDocument;
    }

    WriteableIngestDocument(StreamInput in) throws IOException {
        Map sourceAndMetadata = in.readMap();
        Map ingestMetadata = in.readMap();
        if (in.getVersion().before(Version.V_6_0_0_beta1)) {
            ingestMetadata.computeIfPresent("timestamp", (k, o) -> {
                Date date = (Date) o;
                return date.toInstant().atZone(ZoneId.systemDefault());
            });
        }
        this.ingestDocument = new IngestDocument(sourceAndMetadata, ingestMetadata);
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        out.writeMap(ingestDocument.getSourceAndMetadata());
        out.writeMap(ingestDocument.getIngestMetadata());
    }

    IngestDocument getIngestDocument() {
        return ingestDocument;
    }

    @Override
    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
        builder.startObject(DOC_FIELD);
        Map metadataMap = ingestDocument.getMetadata();
        for (Map.Entry metadata : metadataMap.entrySet()) {
            if (metadata.getValue() != null) {
                builder.field(metadata.getKey().getFieldName(), metadata.getValue().toString());
            }
        }
        Map source = IngestDocument.deepCopyMap(ingestDocument.getSourceAndMetadata());
        metadataMap.keySet().forEach(mD -> source.remove(mD.getFieldName()));
        builder.field(SOURCE_FIELD, source);
        builder.field(INGEST_FIELD, ingestDocument.getIngestMetadata());
        builder.endObject();
        return builder;
    }

    public static WriteableIngestDocument fromXContent(XContentParser parser) {
        return PARSER.apply(parser, null);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        WriteableIngestDocument that = (WriteableIngestDocument) o;
        return Objects.equals(ingestDocument, that.ingestDocument);
    }

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

    @Override
    public String toString() {
        return ingestDocument.toString();
    }
}