/* -*- Mode: C ; c-basic-offset: 2 -*- */
/*
 * LADI Session Handler (ladish)
 *
 * Copyright (C) 2009,2010,2011 Nedko Arnaudov <nedko@arnaudov.name>
 *
 **************************************************************************
 * This file contains implementation of the "start studio" command
 **************************************************************************
 *
 * LADI Session Handler 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 2 of the License, or
 * (at your option) any later version.
 *
 * LADI Session Handler 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 LADI Session Handler. If not, see <http://www.gnu.org/licenses/>
 * or write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <unistd.h>

#include "cmd.h"
#include "studio_internal.h"
#include "loader.h"
#include "../common/time.h"
#include "../proxies/notify_proxy.h"

struct ladish_command_start_studio
{
  struct ladish_command command;
  uint64_t deadline;
};

static bool start_room(void * context, ladish_room_handle room)
{
  return ladish_room_start(room, context);
}

#define cmd_ptr ((struct ladish_command_start_studio *)context)

static bool run(void * context)
{
  bool jack_server_started;
  unsigned int app_count;

  switch (cmd_ptr->command.state)
  {
  case LADISH_COMMAND_STATE_PENDING:
    if (ladish_studio_is_started())
    {
      log_info("Ignoring start request because studio is already started.");
      /* nothing to do, studio is already running */
      cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
      return true;
    }

    app_count = loader_get_app_count();
    if (app_count != 0)
    {
      log_error("Ignoring start request because there are apps running.");
      log_error("This could happen when JACK has crashed or when JACK stopped unexpectedly.");
      log_error("Save your work, then unload and reload the studio.");
      return false;
    }

    log_info("Starting JACK server.");

    ladish_graph_dump(g_studio.studio_graph);

    if (!jack_proxy_start_server())
    {
      log_error("Starting JACK server failed.");
      ladish_notify_simple(
        LADISH_NOTIFY_URGENCY_HIGH,
        "JACK start failed",
        "You may want to inspect the <a href=\"http://ladish.org/wiki/diagnose_files\">JACK log file</a>\n\n"
        "Check if the sound device is connected.\n"
        "Check the JACK configuration.\n"
        "If your sound device does not support hardware mixing, check that it is not in use.\n"
        "If you have more than one sound device, check that their order is correct.");
      return false;
    }

    cmd_ptr->deadline = ladish_get_current_microseconds();
    if (cmd_ptr->deadline != 0)
    {
      cmd_ptr->deadline += 5000000;
    }

    cmd_ptr->command.state = LADISH_COMMAND_STATE_WAITING;
    /* fall through */
  case LADISH_COMMAND_STATE_WAITING:
    if (!ladish_environment_consume_change(&g_studio.env_store, ladish_environment_jack_server_started, &jack_server_started))
    {
      /* we are still waiting for the JACK server start */
      ASSERT(!ladish_environment_get(&g_studio.env_store, ladish_environment_jack_server_started)); /* someone else consumed the state change? */

      if (cmd_ptr->deadline != 0 && ladish_get_current_microseconds() >= cmd_ptr->deadline)
      {
        log_error("Starting JACK server succeded, but 'started' signal was not received within 5 seconds.");
        cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
        return false;
      }

      return true;
    }

    log_info("Wait for JACK server start complete.");

    ASSERT(jack_server_started);

    ladish_studio_on_event_jack_started(); /* fetch configuration and announce start */

    ladish_studio_iterate_rooms(ladish_studio_get_virtualizer(), start_room);

    cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
    return true;
  }

  ASSERT_NO_PASS;
  return false;
}

#undef cmd_ptr

bool ladish_command_start_studio(void * call_ptr, struct ladish_cqueue * queue_ptr)
{
  struct ladish_command_start_studio * cmd_ptr;

  cmd_ptr = ladish_command_new(sizeof(struct ladish_command_start_studio));
  if (cmd_ptr == NULL)
  {
    cdbus_error(call_ptr, DBUS_ERROR_FAILED, "ladish_command_new() failed.");
    goto fail;
  }

  cmd_ptr->command.run = run;
  cmd_ptr->deadline = 0;

  if (!ladish_cqueue_add_command(queue_ptr, &cmd_ptr->command))
  {
    cdbus_error(call_ptr, DBUS_ERROR_FAILED, "ladish_cqueue_add_command() failed.");
    goto fail_destroy_command;
  }

  return true;

fail_destroy_command:
  free(cmd_ptr);

fail:
  return false;
}