/*
 *  dolmetschctl
 *
 *
 *  Copyright (C) 2015 Christian Pointner <equinox@spreadspace.org>
 *
 *  This file is part of dolmetschctl.
 *
 *  dolmetschctl is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  any later version.
 *
 *  dolmetschctl 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with dolmetschctl. If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <error.h>
#include <assert.h>

#include "osc.h"


static void print_error(int num, const char *msg, const char *path)
{
  error(0, 0, "liblo server error %d in path %s: %s", num, path, msg);
}

static int lang_handler(const char *path, const char *types, lo_arg ** argv,
                    int argc, lo_message msg, void *user_data)
{
  if(argc != 1 || !lo_is_string_type((lo_type)types[0]))
    return 1;

  lo_address from = lo_message_get_source(msg);
  const char* host = lo_address_get_hostname(from);
  const char* port = lo_address_get_port(from);
  assert(host && port);

  osc_t* o = (osc_t*)user_data;
  assert(o);
  osc_done_data_t* done_data = malloc(sizeof(osc_done_data_t));
  assert(done_data);

  done_data->self_ = o;
  done_data->state_ = 0;
  assert((done_data->lang_ = strdup(&(argv[0]->s))));
  done_data->addr_ = lo_address_new(host, port);
  assert(done_data->addr_);
  done_data->msg_ = lo_message_new();
  assert(done_data->msg_);
  assert(!lo_message_add(done_data->msg_, "s", done_data->lang_));

  assert(slist_add(&(o->done_data_), done_data));

  return 0;
}

void free_osc_done_data(void* ptr)
{
  osc_done_data_t* done_data = (osc_done_data_t*)ptr;

  lo_message_free(done_data->msg_);
  lo_address_free(done_data->addr_);
  free(done_data->lang_);
  free(done_data);
}

void osc_lang_switch_done(void* data)
{
  assert(data);
  osc_done_data_t* d = data;

  lo_send_message_from(d->addr_, d->self_->server_, "/lang/ack", d->msg_);
  slist_remove(&(d->self_->done_data_), d);
}

int osc_init(osc_t* o, const char* port)
{
  assert(o != NULL);

  o->server_ = NULL;
  slist_init(&(o->done_data_), free_osc_done_data);

  if(!port)
    return 0;

  o->server_ = lo_server_new(port, print_error);
  if(!o->server_)
    return -1;

  if(!lo_server_add_method(o->server_, "/lang/switch", "s", lang_handler, (void*)o))
    return -1;

  return 0;
}


int osc_get_poll_fd_count(osc_t* o)
{
  assert(o);

  if(!o->server_)
    return 0;

  return 1;
}

int osc_get_poll_fds(osc_t* o, struct pollfd *pfds, int npfds)
{
  assert(o);

  if(!o->server_)
    return 0;

  pfds[0].fd = lo_server_get_socket_fd(o->server_);
  pfds[0].events = POLLIN;
  pfds[0].revents = 0;

  return 0;
}

int osc_handle_revents(osc_t* o, struct pollfd *pfds, int npfds, mixer_t* x)
{
  assert(o);

  if(!o->server_)
    return 0;

  if(pfds[0].revents & (POLLERR | POLLHUP | POLLNVAL)) {
    error(0, 0, "OSC: got POLLERR, POLLHUP or POLLNVAL");
    return -1;
  }
  if(!(pfds[0].revents & POLLIN))
    return 0;

  lo_server_recv_noblock(o->server_, 0);

  int ret = 0;
  slist_element_t* tmp;
  for(tmp = o->done_data_.first_; tmp; tmp = tmp->next_) {
    osc_done_data_t* d = (osc_done_data_t*)(tmp->data_);
    if(d->state_ == 0) {
      ret = mixer_switch_lang(x, d->lang_, &osc_lang_switch_done, d);
      if(ret)
        break;

      d->state_ = 1;
    }
  }


  return ret;
}