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/* $Id$ */

/***
  This file is part of avahi.
 
  avahi is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation; either version 2.1 of the
  License, or (at your option) any later version.
 
  avahi is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
  Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with avahi; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#include <avahi-client/client.h>
#include <avahi-common/alternative.h>
#include <avahi-common/simple-watch.h>
#include <avahi-common/malloc.h>
#include <avahi-common/error.h>

static AvahiEntryGroup *group = NULL;
static AvahiSimplePoll *simple_poll = NULL;
static char *name = NULL;

static void create_services(AvahiClient *c);

static void entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
    assert(g == group);

    /* Called whenever the entry group state changes */

    if (state == AVAHI_ENTRY_GROUP_ESTABLISHED)
        /* The entry group has been established successfully */
        fprintf(stderr, "Service '%s' successfully established.\n", name);
    
    else if (state == AVAHI_ENTRY_GROUP_COLLISION) {
        char *n;

        /* A service name collision happened. Let's pick a new name */
        n = avahi_alternative_service_name(name);
        avahi_free(name);
        name = n;

        fprintf(stderr, "Service name collision, renaming service to '%s'\n", name);

        /* And recreate the services */
        create_services(avahi_entry_group_get_client(g));
    }
}

static void create_services(AvahiClient *c) {
    char r[128];
    int ret;
    assert(c);

    /* If this is the first time we're called, let's create a new entry group */
    if (!group) {
        if (!(group = avahi_entry_group_new(c, entry_group_callback, NULL))) {
            fprintf(stderr, "avahi_entry_group_new() failed: %s\n", avahi_strerror(avahi_client_errno(c)));
            goto fail;
        }
    }
    
    fprintf(stderr, "Adding service '%s'\n", name);

    /* Create some random TXT data */
    snprintf(r, sizeof(r), "random=%i", rand());

    /* Add the service for IPP */
    if ((ret = avahi_entry_group_add_service(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_ipp._tcp", NULL, NULL, 651, "test=blah", r, NULL)) < 0) {
        fprintf(stderr, "Failed to add _ipp._tcp service: %s\n", avahi_strerror(ret));
        goto fail;
    }

    /* Add the same service for BSD LPR */
    if ((ret = avahi_entry_group_add_service(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_printer._tcp", NULL, NULL, 515, NULL)) < 0) {
        fprintf(stderr, "Failed to add _printer._tcp service: %s\n", avahi_strerror(ret));
        goto fail;
    }

    /* Add an additional (hypothetic) subtype */
    if ((ret = avahi_entry_group_add_service_subtype(group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, name, "_printer._tcp", NULL, "_magic._sub._printer._tcp") < 0)) {
        fprintf(stderr, "Failed to add subtype _magic._sub._printer._tcp: %s\n", avahi_strerror(ret));
        goto fail;
    }
    
    /* Tell the server to register the service */
    if ((ret = avahi_entry_group_commit(group)) < 0) {
        fprintf(stderr, "Failed to commit entry_group: %s\n", avahi_strerror(ret));
        goto fail;
    }

    return;

fail:
    avahi_simple_poll_quit(simple_poll);
    return;
}

static void client_callback(AvahiClient *c, AvahiClientState state, void * userdata) {
    assert(c);

    /* Called whenever the client or server state changes */

    if (state == AVAHI_CLIENT_S_RUNNING)
        /* The serve has startup successfully and registered its host
         * name on the network, so it's time to create our services */
        create_services(c);
    
    else if (state == AVAHI_CLIENT_S_COLLISION) {
        /* Let's drop our registered services. When the server is back
         * in AVAHI_SERVER_RUNNING state we will register them
         * again with the new host name. */
        if (group)
            avahi_entry_group_reset(group);
        
    } else if (state == AVAHI_CLIENT_DISCONNECTED) {

        fprintf(stderr, "Server connection terminated.\n");
        avahi_simple_poll_quit(simple_poll);
    }
}

int main(int argc, char*argv[]) {
    AvahiClient *client = NULL;
    int error;
    int ret = 1;
    
    /* Allocate main loop object */
    if (!(simple_poll = avahi_simple_poll_new())) {
        fprintf(stderr, "Failed to create simple poll object.\n");
        goto fail;
    }
    
    name = avahi_strdup("MegaPrinter");

    /* Allocate a new client */
    client = avahi_client_new(avahi_simple_poll_get(simple_poll), client_callback, NULL, &error);

    /* Check wether creating the client object succeeded */
    if (!client) {
        fprintf(stderr, "Failed to create client: %s\n", avahi_strerror(error));
        goto fail;
    }
    
    /* Run the main loop */
    for (;;)
        if (avahi_simple_poll_iterate(simple_poll, -1) != 0)
            break;
    
    ret = 0;
    
fail:
    
    /* Cleanup things */
    if (group)
        avahi_entry_group_free(group);

    if (client)
        avahi_client_free(client);

    if (simple_poll)
        avahi_simple_poll_free(simple_poll);

    avahi_free(name);
    
    return ret;
}