package geniusweb.protocol.session.learn;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.UUID;
import java.util.stream.Collectors;

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

import geniusweb.actions.FileLocation;
import geniusweb.deadline.Deadline;
import geniusweb.protocol.session.SessionProtocol;
import geniusweb.protocol.session.SessionSettings;
import geniusweb.protocol.session.TeamInfo;
import geniusweb.protocol.session.saop.SAOPSettings;
import geniusweb.references.Parameters;
import geniusweb.references.PartyWithProfile;
import tudelft.utilities.logging.Reporter;

/**
 * Settings for learn protocol.
 */
public class LearnSettings implements SessionSettings {
	private final List<TeamInfo> participants;
	private final Deadline deadline;

	/**
	 * 
	 * @param participants the list of {@link PartyWithProfile} in clockwise
	 *                     order. There must be at least 2 to run the SAOP
	 *                     protocol. But SAOP can be initialized with less, for
	 *                     use in TournamentSettings.
	 *                     <table>
	 *                     <caption>Required parameters</caption>
	 *                     <tr>
	 *                     <td>persistentstate</td>
	 *                     <td>a {@link FileLocation}, serialized as json eg
	 *                     <code>"b29f3bf5-1dc4-499e-a676-7b2dbb864a03"</code> ,
	 *                     where the party's persistant state is stored; this
	 *                     must match the persistantstate used in earlier calls
	 *                     for e.g. {@link SAOPSettings}.</td>
	 *                     </tr>
	 * 
	 *                     <tr>
	 *                     <td>negotiationdata</td>
	 *                     <td>a List of {@link FileLocation}s, serialized as
	 *                     json, matching the negotiationdata used in earlier
	 *                     calls for eg {@link SAOPSettings}.</td>
	 *                     </tr>
	 *                     </table>
	 * @param deadline     the deadline of the negotiation.
	 */
	@SuppressWarnings("unused")
	@JsonCreator
	public LearnSettings(
			@JsonProperty("participants") List<TeamInfo> participants,
			@JsonProperty("deadline") Deadline deadline) {
		this.participants = participants;
		this.deadline = deadline;
		if (participants == null) {
			throw new IllegalArgumentException("participants must not be null");
		}
		if (deadline == null) {
			throw new IllegalArgumentException("deadline must not be null");
		}

		for (PartyWithProfile pwithp : getAllParties()) {
			Parameters params = pwithp.getParty().getParameters();
			Object statestr = params.get("persistentstate");
			if (!(statestr instanceof String))
				throw new IllegalArgumentException(
						"persistentstate parameter containing UUID string is required, but found "
								+ statestr);
			// check that it contains a UUID. Don't store it, we don't need
			// it.
			UUID.fromString((String) statestr);

			// and check the negotiationdata
			Object negotiationsstr = params.get("negotiationdata");
			if (!(negotiationsstr instanceof List))
				throw new IllegalArgumentException(
						"negotiationdata parameter containing a List is required");

			for (Object negostr : (List) negotiationsstr) {
				if (!(negostr instanceof String))
					throw new IllegalArgumentException(
							"The list in negotiationdata must contain UUID strings but found "
									+ negostr);
				UUID.fromString((String) negostr);
			}
		}
	}

	@Override
	public Double getMaxRunTime() {
		return deadline.getDuration() / 1000d;
	}

	@Override
	public SessionProtocol getProtocol(Reporter logger) {
		return new Learn(new LearnState(this), logger);
	}

	@Override
	public List<TeamInfo> getTeams() {
		return Collections.unmodifiableList(participants);
	}

	/**
	 * @return the deadline for this negotiation
	 */
	public Deadline getDeadline() {
		return deadline;
	}

	@Override
	public List<PartyWithProfile> getAllParties() {
		return participants.stream()
				.map(particip -> particip.getParties().get(0))
				.collect(Collectors.toList());
	}

	@Override
	public Integer getTeamSize() {
		return 1;
	}

	@Override
	public String toString() {
		return "LearnSettings" + participants + "," + deadline + "]";
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result
				+ ((deadline == null) ? 0 : deadline.hashCode());
		result = prime * result
				+ ((participants == null) ? 0 : participants.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;
		LearnSettings other = (LearnSettings) obj;
		if (deadline == null) {
			if (other.deadline != null)
				return false;
		} else if (!deadline.equals(other.deadline))
			return false;
		if (participants == null) {
			if (other.participants != null)
				return false;
		} else if (!participants.equals(other.participants))
			return false;
		return true;
	}

	@Override
	public SessionSettings with(TeamInfo team) {
		if (team.getSize() != 1)
			throw new IllegalArgumentException(
					"Team must be size 1 but found " + team);
		List<TeamInfo> newparts = new LinkedList<>(participants);
		newparts.add(team);
		return new LearnSettings(newparts, deadline);
	}

}