/*
 * 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", the "GNU Affero General Public License v3.0 only", 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", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

package org.elasticsearch.action.search;

import org.elasticsearch.action.ActionRequestValidationException;
import org.elasticsearch.action.LegacyActionRequest;
import org.elasticsearch.action.ValidateActions;
import org.elasticsearch.common.bytes.BytesArray;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.xcontent.ParseField;
import org.elasticsearch.xcontent.ToXContentObject;
import org.elasticsearch.xcontent.XContentBuilder;
import org.elasticsearch.xcontent.XContentParser;

import java.io.IOException;
import java.util.Base64;

public class ClosePointInTimeRequest extends LegacyActionRequest implements ToXContentObject {
    private static final ParseField ID = new ParseField("id");

    private final BytesReference id;

    public ClosePointInTimeRequest(StreamInput in) throws IOException {
        super(in);
        this.id = in.readBytesReference();
    }

    public ClosePointInTimeRequest(BytesReference id) {
        this.id = id;
    }

    public BytesReference getId() {
        return id;
    }

    @Override
    public ActionRequestValidationException validate() {
        if (id.length() == 0) {
            return ValidateActions.addValidationError("id is empty", null);
        }
        return null;
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        super.writeTo(out);
        out.writeBytesReference(id);
    }

    @Override
    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
        builder.startObject();
        builder.field(ID.getPreferredName(), id);
        builder.endObject();
        return builder;
    }

    public static ClosePointInTimeRequest fromXContent(XContentParser parser) throws IOException {
        if (parser.nextToken() != XContentParser.Token.START_OBJECT) {
            throw new IllegalArgumentException("Malformed content, must start with an object");
        } else {
            XContentParser.Token token;
            BytesReference id = null;
            while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
                if (token == XContentParser.Token.FIELD_NAME && parser.currentName().equals(ID.getPreferredName())) {
                    token = parser.nextToken();
                    if (token.isValue() == false) {
                        throw new IllegalArgumentException("the request must contain only [" + ID.getPreferredName() + " field");
                    }
                    id = new BytesArray(Base64.getUrlDecoder().decode(parser.text()));
                } else {
                    throw new IllegalArgumentException(
                        "Unknown parameter [" + parser.currentName() + "] in request body or parameter is of the wrong type[" + token + "] "
                    );
                }
            }
            if (id == null || id.length() == 0) {
                throw new IllegalArgumentException("search context id is is not provided");
            }
            return new ClosePointInTimeRequest(id);
        }
    }
}