package geniusweb.inform;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.stream.Collectors;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;

import geniusweb.actions.PartyId;
import geniusweb.actions.VotesWithValue;

/**
 * Informs party that it's time to Opt-in.
 */
public class OptInWithValue implements Inform {

	private final List<VotesWithValue> votes;

	/**
	 * @param votes a list of votes. There may be only one votes per party.
	 */
	@JsonCreator
	public OptInWithValue(@JsonProperty("votes") List<VotesWithValue> votes) {
		this.votes = votes;

		Map<PartyId, Long> counts = votes.stream().map(vote -> vote.getActor())
				.collect(Collectors.groupingBy(actor -> actor,
						Collectors.counting()));
		Optional<Entry<PartyId, Long>> nonunique = counts.entrySet().stream()
				.filter(entry -> entry.getValue() > 1).findAny();
		if (nonunique.isPresent())
			throw new IllegalArgumentException(
					"OptIn contains multiple Votes for party "
							+ nonunique.get().getKey());

	}

	/**
	 * @return list of votes that can be opted in to
	 */
	public List<VotesWithValue> getVotes() {
		return Collections.unmodifiableList(votes);
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((votes == null) ? 0 : votes.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		OptInWithValue other = (OptInWithValue) obj;
		if (votes == null) {
			if (other.votes != null)
				return false;
		} else if (!votes.equals(other.votes))
			return false;
		return true;
	}

	@Override
	public String toString() {
		return "OptInWithValue[" + votes + "]";
	}

}