/*
 * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
 *
 * Distributable under LGPL license.
 * See terms of license at gnu.org.
 */
package net.java.sip.communicator.impl.protocol.icq;

import net.java.sip.communicator.service.protocol.*;
import net.kano.joustsim.Screenname;

/**
 * Contains methods that would allow service users to re-request authorizations
 * to add a contact to their contact list or, send them an authorization before
 * having been asked.
 *
 * @author Damian Minkov
 */
public class OperationSetExtendedAuthorizationsIcqImpl 
    implements OperationSetExtendedAuthorizations
{

    /**
     * A callback to the ICQ provider that created us.
     */
    private ProtocolProviderServiceIcqImpl icqProvider = null;
    
    
    /** 
     * Creates a new instance of OperationSetExtendedAuthorizationsIcqImpl 
     * @param icqProvider IcqProtocolProviderServiceImpl
     */
    public OperationSetExtendedAuthorizationsIcqImpl(
        ProtocolProviderServiceIcqImpl icqProvider) 
    {
        this.icqProvider = icqProvider;
    }

    /**
     * Send an authorization request, requesting <tt>contact</tt> to add them
     * to our contact list?
     * 
     * @param request the <tt>AuthorizationRequest</tt> that we'd like the
     * protocol provider to send to <tt>contact</tt>.
     * @param contact the <tt>Contact</tt> who we'd be asking for an
     * authorization.
     * @throws OperationFailedException if we fail sending the authorization
     * request.
     */
    public void reRequestAuthorization(AuthorizationRequest request, Contact contact) 
        throws OperationFailedException 
    {
        assertConnected();

        if(! (contact instanceof ContactIcqImpl) )
            throw new IllegalArgumentException(
                "Argument is not an icq contact (contact=" + contact + ")");
        
        icqProvider.getAimConnection().getSsiService().requestBuddyAuthorization(
            new Screenname(contact.getAddress()), 
            request.getReason());
    }

    /**
     * Send a positive authorization to <tt>contact</tt> thus allowing them to
     * add us to their contact list without needing to first request an
     * authorization.
     * 
     * @param contact the <tt>Contact</tt> whom we're granting authorization
     * prior to receiving a request.
     * @throws OperationFailedException if we fail sending the authorization.
     */
    public void explicitAuthorize(Contact contact) 
        throws OperationFailedException 
    {
        assertConnected();

        if(! (contact instanceof ContactIcqImpl) )
            throw new IllegalArgumentException(
                "Argument is not an icq contact (contact=" + contact + ")");
        
        icqProvider.getAimConnection().getSsiService().sendFutureBuddyAuthorization(
            new Screenname(contact.getAddress()), 
            "");
    }
    
    /**
     * Utility method throwing an exception if the icq stack is not properly
     * initialized.
     * @throws java.lang.IllegalStateException if the underlying ICQ stack is
     * not registered and initialized.
     */
    private void assertConnected() throws IllegalStateException
    {
        if (icqProvider == null)
            throw new IllegalStateException(
                "The icq provider must be non-null and signed on the ICQ "
                +"service before being able to communicate.");
        if (!icqProvider.isRegistered())
            throw new IllegalStateException(
                "The icq provider must be signed on the ICQ service before "
                +"being able to communicate.");
    }
}