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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.slm;

import org.elasticsearch.common.Strings;
import org.elasticsearch.core.Nullable;
import org.elasticsearch.xcontent.ConstructingObjectParser;
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.Map;
import java.util.Objects;

public class SnapshotLifecyclePolicy implements ToXContentObject {

    private final String id;
    private final String name;
    private final String schedule;
    private final String repository;
    private final Map configuration;
    private final SnapshotRetentionConfiguration retentionPolicy;

    private static final ParseField NAME = new ParseField("name");
    private static final ParseField SCHEDULE = new ParseField("schedule");
    private static final ParseField REPOSITORY = new ParseField("repository");
    private static final ParseField CONFIG = new ParseField("config");
    private static final ParseField RETENTION = new ParseField("retention");

    @SuppressWarnings("unchecked")
    private static final ConstructingObjectParser PARSER = new ConstructingObjectParser<>(
        "snapshot_lifecycle",
        true,
        (a, id) -> {
            String name = (String) a[0];
            String schedule = (String) a[1];
            String repo = (String) a[2];
            Map config = (Map) a[3];
            SnapshotRetentionConfiguration retention = (SnapshotRetentionConfiguration) a[4];
            return new SnapshotLifecyclePolicy(id, name, schedule, repo, config, retention);
        }
    );

    static {
        PARSER.declareString(ConstructingObjectParser.constructorArg(), NAME);
        PARSER.declareString(ConstructingObjectParser.constructorArg(), SCHEDULE);
        PARSER.declareString(ConstructingObjectParser.constructorArg(), REPOSITORY);
        PARSER.declareObject(ConstructingObjectParser.optionalConstructorArg(), (p, c) -> p.map(), CONFIG);
        PARSER.declareObject(ConstructingObjectParser.optionalConstructorArg(), SnapshotRetentionConfiguration::parse, RETENTION);
    }

    public SnapshotLifecyclePolicy(
        final String id,
        final String name,
        final String schedule,
        final String repository,
        @Nullable final Map configuration,
        @Nullable final SnapshotRetentionConfiguration retentionPolicy
    ) {
        this.id = Objects.requireNonNull(id, "policy id is required");
        this.name = Objects.requireNonNull(name, "policy snapshot name is required");
        this.schedule = Objects.requireNonNull(schedule, "policy schedule is required");
        this.repository = Objects.requireNonNull(repository, "policy snapshot repository is required");
        this.configuration = configuration;
        this.retentionPolicy = retentionPolicy;
    }

    public String getId() {
        return this.id;
    }

    public String getName() {
        return this.name;
    }

    public String getSchedule() {
        return this.schedule;
    }

    public String getRepository() {
        return this.repository;
    }

    @Nullable
    public Map getConfig() {
        return this.configuration;
    }

    @Nullable
    public SnapshotRetentionConfiguration getRetentionPolicy() {
        return this.retentionPolicy;
    }

    public static SnapshotLifecyclePolicy parse(XContentParser parser, String id) {
        return PARSER.apply(parser, id);
    }

    @Override
    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
        builder.startObject();
        builder.field(NAME.getPreferredName(), this.name);
        builder.field(SCHEDULE.getPreferredName(), this.schedule);
        builder.field(REPOSITORY.getPreferredName(), this.repository);
        if (this.configuration != null) {
            builder.field(CONFIG.getPreferredName(), this.configuration);
        }
        if (this.retentionPolicy != null) {
            builder.field(RETENTION.getPreferredName(), this.retentionPolicy);
        }
        builder.endObject();
        return builder;
    }

    @Override
    public int hashCode() {
        return Objects.hash(id, name, schedule, repository, configuration, retentionPolicy);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }

        if (obj.getClass() != getClass()) {
            return false;
        }
        SnapshotLifecyclePolicy other = (SnapshotLifecyclePolicy) obj;
        return Objects.equals(id, other.id)
            && Objects.equals(name, other.name)
            && Objects.equals(schedule, other.schedule)
            && Objects.equals(repository, other.repository)
            && Objects.equals(configuration, other.configuration)
            && Objects.equals(retentionPolicy, other.retentionPolicy);
    }

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