/*
 * Copyright (c) 2006-2017 DMDirc Developers
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.dmdirc.parser.xmpp;

import com.dmdirc.parser.common.AwayState;
import com.dmdirc.parser.common.BaseClientInfo;
import com.dmdirc.parser.interfaces.ChannelClientInfo;

import com.google.common.collect.Lists;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.jivesoftware.smack.RosterEntry;
import org.jivesoftware.smack.packet.Presence;
import org.jivesoftware.smack.packet.Presence.Mode;
import org.jivesoftware.smack.packet.Presence.Type;

/**
 * An XMPP-specific client info object.
 */
public class XmppClientInfo extends BaseClientInfo {

    /** A map of known endpoints for this client. */
    private final Map<String, XmppEndpoint> endpoints = new HashMap<>();

    /**
     * Creates a new XMPP Client Info object with the specified details.
     *
     * @param parser The parser that owns this client info object
     * @param nick   The nickname of the user this object represents
     * @param user   The username of the user this object represents
     * @param host   The hostname of the user this object represents
     */
    public XmppClientInfo(final XmppParser parser, final String nick, final String user,
            final String host) {
        super(parser, nick, user, host);
    }

    @Override
    public int getChannelCount() {
        return 0;
    }

    @Override
    public List<ChannelClientInfo> getChannelClients() {
        return Lists.newArrayList();
    }

    /**
     * Retrieves the map of known endpoints for this client.
     *
     * @return A map of endpoint names to presence states.
     */
    public Map<String, XmppEndpoint> getEndpoints() {
        return Collections.unmodifiableMap(endpoints);
    }

    /**
     * Sets the presence of one endpoint of this client.
     *
     * @param packet The presence packet received
     */
    public void setPresence(final Presence packet) {
        final String[] parts = getParser().parseHostmask(packet.getFrom());
        final boolean wasAway = isAway();

        if (packet.getType() == Type.unavailable) {
            endpoints.remove(parts[1]);
        } else {
            if (!endpoints.containsKey(parts[1])) {
                endpoints.put(parts[1], new XmppEndpoint());
            }

            final XmppEndpoint endpoint = endpoints.get(parts[1]);
            endpoint.setPriority(packet.getPriority());
            endpoint.setMode(packet.getMode());
            endpoint.setType(packet.getType());
            endpoint.setStatus(packet.getStatus());
        }

        final boolean isAway = isAway();

        if (wasAway != isAway) {
            // Their away status has changed
            getParser().handleAwayStateChange(this, wasAway);
        }
    }

    /**
     * Determines whether or not this contact is "away" - that is, their aggregate presence state is
     * "Unavailable", "Away", "DND" or "XA".
     *
     * @return True if the client is away, false otherwise
     */
    public boolean isAway() {
        final Mode presence = getAggregatePresence();

        return presence == null || presence.compareTo(Mode.away) >= 0;
    }

    @Override
    public AwayState getAwayState() {
        return isAway() ? AwayState.AWAY : AwayState.HERE;
    }

    /**
     * Gets the aggregate presence of this contact.
     *
     * @return The highest available state of the contact's highest priority endpoints, * or
     *         <code>null</code> if no endpoints are available.
     */
    public Mode getAggregatePresence() {
        final List<XmppEndpoint> sortedEndpoints = new ArrayList<>(endpoints.values());
        Collections.sort(sortedEndpoints);

        // Get the set of the highest priority endpoints
        final Set<XmppEndpoint> bestEndpoints = new HashSet<>(sortedEndpoints.size());
        int best = 0;
        for (XmppEndpoint endpoint : sortedEndpoints) {
            if (endpoint.getType() != Type.available) {
                continue;
            }

            if (bestEndpoints.isEmpty()) {
                best = endpoint.getPriority();
            }

            if (endpoint.getPriority() == best && best >= 0) {
                bestEndpoints.add(endpoint);
            }
        }

        // Find the best presence
        Mode bestPresence = null;
        for (XmppEndpoint endpoint : bestEndpoints) {
            final Mode targetMode = endpoint.getMode() == null ? Mode.available : endpoint.getMode();
            if (bestPresence == null || bestPresence.compareTo(targetMode) > 0) {
                bestPresence = targetMode;
            }
        }

        return bestPresence;
    }

    /**
     * Updates this client with information from the roster.
     *
     * @param entry The roster entry to update this client with
     */
    public void setRosterEntry(final RosterEntry entry) {
        setRealname(entry.getName());
    }

    @Override
    public XmppParser getParser() {
        return (XmppParser) super.getParser();
    }

}