/*
 * 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.snapshots;

import org.elasticsearch.common.Strings;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.xcontent.ToXContentObject;
import org.elasticsearch.xcontent.XContentBuilder;

import java.io.IOException;
import java.util.List;
import java.util.Objects;

/**
 * Information about successfully completed restore operation.
 * <p>
 * Returned as part of {@link org.elasticsearch.action.admin.cluster.snapshots.restore.RestoreSnapshotResponse}
 */
public class RestoreInfo implements ToXContentObject, Writeable {

    private final String name;
    private final List<String> indices;
    private final int totalShards;
    private final int successfulShards;

    public RestoreInfo(String name, List<String> indices, int totalShards, int successfulShards) {
        this.name = name;
        this.indices = indices;
        this.totalShards = totalShards;
        this.successfulShards = successfulShards;
    }

    public RestoreInfo(StreamInput in) throws IOException {
        name = in.readString();
        indices = in.readImmutableStringList();
        totalShards = in.readVInt();
        successfulShards = in.readVInt();
    }

    /**
     * Snapshot name
     *
     * @return snapshot name
     */
    public String name() {
        return name;
    }

    /**
     * List of restored indices
     *
     * @return list of restored indices
     */
    public List<String> indices() {
        return indices;
    }

    /**
     * Number of shards being restored
     *
     * @return number of being restored
     */
    public int totalShards() {
        return totalShards;
    }

    /**
     * Number of failed shards
     *
     * @return number of failed shards
     */
    public int failedShards() {
        return totalShards - successfulShards;
    }

    /**
     * Number of successful shards
     *
     * @return number of successful shards
     */
    public int successfulShards() {
        return successfulShards;
    }

    @Override
    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
        builder.startObject();
        builder.field("snapshot", name);
        builder.startArray("indices");
        for (String index : indices) {
            builder.value(index);
        }
        builder.endArray();
        builder.startObject("shards");
        builder.field("total", totalShards);
        builder.field("failed", failedShards());
        builder.field("successful", successfulShards);
        builder.endObject();
        builder.endObject();
        return builder;
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        out.writeString(name);
        out.writeStringCollection(indices);
        out.writeVInt(totalShards);
        out.writeVInt(successfulShards);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        RestoreInfo that = (RestoreInfo) o;
        return totalShards == that.totalShards
            && successfulShards == that.successfulShards
            && Objects.equals(name, that.name)
            && Objects.equals(indices, that.indices);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, indices, totalShards, successfulShards);
    }

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