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package io.servicefabric.cluster;

import static io.servicefabric.cluster.ClusterMemberStatus.*;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.annotation.Nonnull;

import com.google.common.base.Objects;
import io.servicefabric.transport.utils.KVPair;

/**
 * DTO class.
 * Hosting cluster endpoint, status, metadata and update timestamp.
 * Most important, contains -- {@link #compareTo(ClusterMember)}.
 */
public final class ClusterMember implements Comparable {
	private final ClusterEndpoint endpoint;
	private final ClusterMemberStatus status;
	private final List> metadata = new ArrayList<>();
	private final long lastUpdateTimestamp;

	ClusterMember(ClusterEndpoint endpoint, ClusterMemberStatus status, Map metadata) {
		this(endpoint, status, metadata, System.currentTimeMillis());
	}

	ClusterMember(ClusterEndpoint endpoint, ClusterMemberStatus status, Map metadata, long lastUpdateTimestamp) {
		this.endpoint = endpoint;
		this.status = status;
		for (Map.Entry entry : metadata.entrySet()) {
			this.metadata.add(new KVPair<>(entry.getKey(), entry.getValue()));
		}
		this.lastUpdateTimestamp = lastUpdateTimestamp;
	}

	public ClusterEndpoint endpoint() {
		return endpoint;
	}

	public ClusterMemberStatus status() {
		return status;
	}

	public Map metadata() {
		Map map = new HashMap<>();
		for (KVPair pair : metadata) {
			map.put(pair.getKey(), pair.getValue());
		}
		return map;
	}

	public long lastUpdateTimestamp() {
		return lastUpdateTimestamp;
	}

	@Override
	public int compareTo(@Nonnull ClusterMember r1) {
		if (status == r1.status)
			return 0;
		if (status == SHUTDOWN)
			return 1;
		if (r1.status == SHUTDOWN)
			return -1;

		int clockCompare = Long.compare(lastUpdateTimestamp, r1.lastUpdateTimestamp);
		if (clockCompare < 0)
			return -1;
		if (clockCompare == 0 && (status == TRUSTED && r1.status == SUSPECTED))
			return -1;

		return 1;
	}

	@Override
	public String toString() {
		return Objects.toStringHelper(this)
				.add("endpoint", endpoint)
				.add("status", status)
				.add("metadata", metadata)
				.add("updateTimestamp", lastUpdateTimestamp)
				.toString();
	}
}