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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.client.ml;

import org.elasticsearch.core.Nullable;
import org.elasticsearch.tasks.TaskId;
import org.elasticsearch.xcontent.ConstructingObjectParser;
import org.elasticsearch.xcontent.ObjectParser;
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.Objects;

/**
 * Response object that contains the acknowledgement or the task id
 * depending on whether the reset job action was requested to wait for completion.
 */
public class ResetJobResponse implements ToXContentObject {

    private static final ParseField ACKNOWLEDGED = new ParseField("acknowledged");
    private static final ParseField TASK = new ParseField("task");

    public static final ConstructingObjectParser PARSER = new ConstructingObjectParser<>(
        "reset_job_response",
        true,
        a -> new ResetJobResponse((Boolean) a[0], (TaskId) a[1])
    );

    static {
        PARSER.declareBoolean(ConstructingObjectParser.optionalConstructorArg(), ACKNOWLEDGED);
        PARSER.declareField(ConstructingObjectParser.optionalConstructorArg(), TaskId.parser(), TASK, ObjectParser.ValueType.STRING);
    }

    public static ResetJobResponse fromXContent(XContentParser parser) throws IOException {
        return PARSER.parse(parser, null);
    }

    private final Boolean acknowledged;
    private final TaskId task;

    ResetJobResponse(@Nullable Boolean acknowledged, @Nullable TaskId task) {
        assert acknowledged != null || task != null;
        this.acknowledged = acknowledged;
        this.task = task;
    }

    /**
     * Get the action acknowledgement
     * @return {@code null} when the request had {@link ResetJobRequest#getWaitForCompletion()} set to {@code false} or
     * otherwise a {@code boolean} that indicates whether the job was reset successfully.
     */
    public Boolean getAcknowledged() {
        return acknowledged;
    }

    /**
     * Get the task id
     * @return {@code null} when the request had {@link ResetJobRequest#getWaitForCompletion()} set to {@code true} or
     * otherwise the id of the job reset task.
     */
    public TaskId getTask() {
        return task;
    }

    @Override
    public int hashCode() {
        return Objects.hash(acknowledged, task);
    }

    @Override
    public boolean equals(Object other) {
        if (this == other) {
            return true;
        }

        if (other == null || getClass() != other.getClass()) {
            return false;
        }

        ResetJobResponse that = (ResetJobResponse) other;
        return Objects.equals(acknowledged, that.acknowledged) && Objects.equals(task, that.task);
    }

    @Override
    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
        builder.startObject();
        if (acknowledged != null) {
            builder.field(ACKNOWLEDGED.getPreferredName(), acknowledged);
        }
        if (task != null) {
            builder.field(TASK.getPreferredName(), task.toString());
        }
        builder.endObject();
        return builder;
    }
}