/**
 *
 * Copyright 2003-2007 Jive Software.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jivesoftware.smack.roster;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import org.jivesoftware.smack.Manager;
import org.jivesoftware.smack.SmackException.NoResponseException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.XMPPException.XMPPErrorException;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.roster.packet.RosterPacket;


/**
 * Each user in your roster is represented by a roster entry, which contains the user's
 * JID and a name or nickname you assign.
 *
 * @author Matt Tucker
 */
public final class RosterEntry extends Manager {

    /**
     * The JID of the entity/user.
     */
    private final String user;

    private String name;
    private RosterPacket.ItemType type;
    private RosterPacket.ItemStatus status;
    final private Roster roster;

    /**
     * Creates a new roster entry.
     *
     * @param user the user.
     * @param name the nickname for the entry.
     * @param type the subscription type.
     * @param status the subscription status (related to subscriptions pending to be approbed).
     * @param connection a connection to the XMPP server.
     */
    RosterEntry(String user, String name, RosterPacket.ItemType type,
                RosterPacket.ItemStatus status, Roster roster, XMPPConnection connection) {
        super(connection);
        this.user = user;
        this.name = name;
        this.type = type;
        this.status = status;
        this.roster = roster;
    }

    /**
     * Returns the JID of the user associated with this entry.
     *
     * @return the user associated with this entry.
     */
    public String getUser() {
        return user;
    }

    /**
     * Returns the name associated with this entry.
     *
     * @return the name.
     */
    public String getName() {
        return name;
    }

    /**
     * Sets the name associated with this entry.
     *
     * @param name the name.
     * @throws NotConnectedException 
     * @throws XMPPErrorException 
     * @throws NoResponseException 
     */
    public synchronized void setName(String name) throws NotConnectedException, NoResponseException, XMPPErrorException {
        // Do nothing if the name hasn't changed.
        if (name != null && name.equals(this.name)) {
            return;
        }

        RosterPacket packet = new RosterPacket();
        packet.setType(IQ.Type.set);

        // Create a new roster item with the current RosterEntry and the *new* name. Note that we can't set the name of
        // RosterEntry right away, as otherwise the updated event wont get fired, because equalsDeep would return true.
        packet.addRosterItem(toRosterItem(this, name));
        connection().createPacketCollectorAndSend(packet).nextResultOrThrow();

        // We have received a result response to the IQ set, the name was successfully changed
        this.name = name;
    }

    /**
     * Updates the state of the entry with the new values.
     *
     * @param name the nickname for the entry.
     * @param type the subscription type.
     * @param status the subscription status (related to subscriptions pending to be approbed).
     */
    void updateState(String name, RosterPacket.ItemType type, RosterPacket.ItemStatus status) {
        this.name = name;
        this.type = type;
        this.status = status;
    }

    /**
     * Returns an copied list of the roster groups that this entry belongs to.
     *
     * @return an iterator for the groups this entry belongs to.
     */
    public List<RosterGroup> getGroups() {
        List<RosterGroup> results = new ArrayList<RosterGroup>();
        // Loop through all roster groups and find the ones that contain this
        // entry. This algorithm should be fine
        for (RosterGroup group: roster.getGroups()) {
            if (group.contains(this)) {
                results.add(group);
            }
        }
        return results;
    }

    /**
     * Returns the roster subscription type of the entry. When the type is
     * RosterPacket.ItemType.none or RosterPacket.ItemType.from,
     * refer to {@link RosterEntry getStatus()} to see if a subscription request
     * is pending.
     *
     * @return the type.
     */
    public RosterPacket.ItemType getType() {
        return type;
    }

    /**
     * Returns the roster subscription status of the entry. When the status is
     * RosterPacket.ItemStatus.SUBSCRIPTION_PENDING, the contact has to answer the
     * subscription request.
     *
     * @return the status.
     */
    public RosterPacket.ItemStatus getStatus() {
        return status;
    }

    public String toString() {
        StringBuilder buf = new StringBuilder();
        if (name != null) {
            buf.append(name).append(": ");
        }
        buf.append(user);
        Collection<RosterGroup> groups = getGroups();
        if (!groups.isEmpty()) {
            buf.append(" [");
            Iterator<RosterGroup> iter = groups.iterator();
            RosterGroup group = iter.next();
            buf.append(group.getName());
            while (iter.hasNext()) {
            buf.append(", ");
                group = iter.next();
                buf.append(group.getName());
            }
            buf.append("]");
        }
        return buf.toString();
    }

    @Override
    public int hashCode() {
        return (user == null ? 0 : user.hashCode());
    }

    public boolean equals(Object object) {
        if (this == object) {
            return true;
        }
        if (object != null && object instanceof RosterEntry) {
            return user.equals(((RosterEntry)object).getUser());
        }
        else {
            return false;
        }
    }

    /**
     * Indicates whether some other object is "equal to" this by comparing all members.
     * <p>
     * The {@link #equals(Object)} method returns <code>true</code> if the user JIDs are equal.
     * 
     * @param obj the reference object with which to compare.
     * @return <code>true</code> if this object is the same as the obj argument; <code>false</code>
     *         otherwise.
     */
    public boolean equalsDeep(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        RosterEntry other = (RosterEntry) obj;
        if (name == null) {
            if (other.name != null)
                return false;
        }
        else if (!name.equals(other.name))
            return false;
        if (status == null) {
            if (other.status != null)
                return false;
        }
        else if (!status.equals(other.status))
            return false;
        if (type == null) {
            if (other.type != null)
                return false;
        }
        else if (!type.equals(other.type))
            return false;
        if (user == null) {
            if (other.user != null)
                return false;
        }
        else if (!user.equals(other.user))
            return false;
        return true;
    }
    
    static RosterPacket.Item toRosterItem(RosterEntry entry) {
        return toRosterItem(entry, entry.getName());
    }

    private static RosterPacket.Item toRosterItem(RosterEntry entry, String name) {
        RosterPacket.Item item = new RosterPacket.Item(entry.getUser(), name);
        item.setItemType(entry.getType());
        item.setItemStatus(entry.getStatus());
        // Set the correct group names for the item.
        for (RosterGroup group : entry.getGroups()) {
            item.addGroupName(group.getName());
        }
        return item;
    }

}