/*
 * 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.transport;

import org.elasticsearch.TransportVersions;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.core.TimeValue;
import org.elasticsearch.xcontent.ToXContentFragment;
import org.elasticsearch.xcontent.XContentBuilder;

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

/**
 * This class encapsulates all remote cluster information to be rendered on
 * {@code _remote/info} requests.
 */
public final class RemoteConnectionInfo implements ToXContentFragment, Writeable {

    final ModeInfo modeInfo;
    final TimeValue initialConnectionTimeout;
    final String clusterAlias;
    final boolean skipUnavailable;
    final boolean hasClusterCredentials;

    public RemoteConnectionInfo(
        String clusterAlias,
        ModeInfo modeInfo,
        TimeValue initialConnectionTimeout,
        boolean skipUnavailable,
        boolean hasClusterCredentials
    ) {
        this.clusterAlias = clusterAlias;
        this.modeInfo = modeInfo;
        this.initialConnectionTimeout = initialConnectionTimeout;
        this.skipUnavailable = skipUnavailable;
        this.hasClusterCredentials = hasClusterCredentials;
    }

    public RemoteConnectionInfo(StreamInput input) throws IOException {
        RemoteConnectionStrategy.ConnectionStrategy mode = input.readEnum(RemoteConnectionStrategy.ConnectionStrategy.class);
        modeInfo = mode.getReader().read(input);
        initialConnectionTimeout = input.readTimeValue();
        clusterAlias = input.readString();
        skipUnavailable = input.readBoolean();
        if (input.getTransportVersion().onOrAfter(TransportVersions.V_8_8_0)) {
            hasClusterCredentials = input.readBoolean();
        } else {
            hasClusterCredentials = false;
        }
    }

    public boolean isConnected() {
        return modeInfo.isConnected();
    }

    public String getClusterAlias() {
        return clusterAlias;
    }

    public ModeInfo getModeInfo() {
        return modeInfo;
    }

    public boolean hasClusterCredentials() {
        return hasClusterCredentials;
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        out.writeEnum(modeInfo.modeType());
        modeInfo.writeTo(out);
        out.writeTimeValue(initialConnectionTimeout);
        out.writeString(clusterAlias);
        out.writeBoolean(skipUnavailable);
        if (out.getTransportVersion().onOrAfter(TransportVersions.V_8_8_0)) {
            out.writeBoolean(hasClusterCredentials);
        }
    }

    @Override
    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
        builder.startObject(clusterAlias);
        {
            builder.field("connected", modeInfo.isConnected());
            builder.field("mode", modeInfo.modeName());
            modeInfo.toXContent(builder, params);
            builder.field("initial_connect_timeout", initialConnectionTimeout);
            builder.field("skip_unavailable", skipUnavailable);
            if (hasClusterCredentials) {
                builder.field("cluster_credentials", "::es_redacted::");
            }
        }
        builder.endObject();
        return builder;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        RemoteConnectionInfo that = (RemoteConnectionInfo) o;
        return skipUnavailable == that.skipUnavailable
            && Objects.equals(modeInfo, that.modeInfo)
            && Objects.equals(initialConnectionTimeout, that.initialConnectionTimeout)
            && Objects.equals(clusterAlias, that.clusterAlias)
            && hasClusterCredentials == that.hasClusterCredentials;
    }

    @Override
    public int hashCode() {
        return Objects.hash(modeInfo, initialConnectionTimeout, clusterAlias, skipUnavailable, hasClusterCredentials);
    }

    public interface ModeInfo extends ToXContentFragment, Writeable {

        boolean isConnected();

        String modeName();

        RemoteConnectionStrategy.ConnectionStrategy modeType();
    }
}