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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.cluster.node;

import org.elasticsearch.Version;
import org.elasticsearch.common.UUIDs;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.index.IndexVersion;
import org.elasticsearch.node.Node;

import java.util.Map;
import java.util.Objects;
import java.util.Set;

import static org.elasticsearch.test.ESTestCase.buildNewFakeTransportAddress;

public class DiscoveryNodeUtils {

    public static DiscoveryNode create(String id) {
        return builder(id).build();
    }

    public static DiscoveryNode create(String name, String id) {
        return builder(id).name(name).build();
    }

    public static DiscoveryNode create(String id, TransportAddress address) {
        return builder(id).address(address).build();
    }

    public static DiscoveryNode create(String id, TransportAddress address, Version version) {
        return builder(id).address(address).version(version).build();
    }

    public static DiscoveryNode create(String id, TransportAddress address, Map attributes, Set roles) {
        return builder(id).address(address).attributes(attributes).roles(roles).build();
    }

    public static DiscoveryNode create(
        String nodeName,
        String nodeId,
        TransportAddress address,
        Map attributes,
        Set roles
    ) {
        return builder(nodeId).name(nodeName).address(address).attributes(attributes).roles(roles).build();
    }

    public static Builder builder(String id) {
        return new Builder(id);
    }

    public static class Builder {
        private final String id;
        private String name;
        private String ephemeralId = UUIDs.randomBase64UUID();
        private String hostName;
        private String hostAddress;
        private TransportAddress address;
        private Map attributes = Map.of();
        private Set roles = DiscoveryNodeRole.roles();
        private Version version;
        private IndexVersion minIndexVersion;
        private IndexVersion maxIndexVersion;
        private String externalId;

        private Builder(String id) {
            this.id = Objects.requireNonNull(id);
        }

        public Builder name(String name) {
            this.name = name;
            return this;
        }

        public Builder ephemeralId(String ephemeralId) {
            this.ephemeralId = Objects.requireNonNull(ephemeralId);
            return this;
        }

        public Builder address(TransportAddress address) {
            return address(null, null, address);
        }

        public Builder address(String hostName, String hostAddress, TransportAddress address) {
            this.hostName = hostName;
            this.hostAddress = hostAddress;
            this.address = Objects.requireNonNull(address);
            return this;
        }

        public Builder attributes(Map attributes) {
            this.attributes = Objects.requireNonNull(attributes);
            return this;
        }

        public Builder roles(Set roles) {
            this.roles = Objects.requireNonNull(roles);
            return this;
        }

        public Builder version(Version version) {
            this.version = version;
            return this;
        }

        public Builder version(Version version, IndexVersion minIndexVersion, IndexVersion maxIndexVersion) {
            this.version = version;
            this.minIndexVersion = minIndexVersion;
            this.maxIndexVersion = maxIndexVersion;
            return this;
        }

        public Builder version(VersionInformation versions) {
            this.version = versions.nodeVersion();
            this.minIndexVersion = versions.minIndexVersion();
            this.maxIndexVersion = versions.maxIndexVersion();
            return this;
        }

        public Builder externalId(String externalId) {
            this.externalId = externalId;
            return this;
        }

        public Builder applySettings(Settings settings) {
            return name(Node.NODE_NAME_SETTING.get(settings)).attributes(Node.NODE_ATTRIBUTES.getAsMap(settings))
                .roles(DiscoveryNode.getRolesFromSettings(settings))
                .externalId(Node.NODE_EXTERNAL_ID_SETTING.get(settings));
        }

        public DiscoveryNode build() {
            if (address == null) {
                address = buildNewFakeTransportAddress();
            }
            if (hostName == null) {
                hostName = address.address().getHostString();
            }
            if (hostAddress == null) {
                hostAddress = address.getAddress();
            }

            VersionInformation versionInfo;
            if (minIndexVersion == null || maxIndexVersion == null) {
                versionInfo = VersionInformation.inferVersions(version);
            } else {
                versionInfo = new VersionInformation(version, minIndexVersion, maxIndexVersion);
            }

            return new DiscoveryNode(name, id, ephemeralId, hostName, hostAddress, address, attributes, roles, versionInfo, externalId);
        }
    }
}