#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/wait.h>
#include <gst/gst.h>

static guint64 iterations = 0;
static guint64 sum = 0;
static guint64 min = G_MAXINT64;
static guint64 max = 0;
static GstClock *s_clock;

gboolean
idle_func (gpointer data)
{
  gboolean busy;
  GTimeVal tfthen, tfnow;
  GstClockTimeDiff diff;

  if (s_clock) {
    //g_print ("%" G_GINT64_FORMAT "\n", gst_clock_get_time (s_clock));
  }

  g_get_current_time (&tfthen);
  busy = gst_bin_iterate (GST_BIN (data));
  iterations++;
  g_get_current_time (&tfnow);

  diff = GST_TIMEVAL_TO_TIME (tfnow) -
         GST_TIMEVAL_TO_TIME (tfthen);

  sum += diff; 
  min = MIN (min, diff);
  max = MAX (max, diff);

  if (!busy) {
    gst_main_quit ();
    g_print ("execution ended after %" G_GUINT64_FORMAT " iterations (sum %" G_GUINT64_FORMAT " ns, average %" G_GUINT64_FORMAT " ns, min %" G_GUINT64_FORMAT " ns, max %" G_GUINT64_FORMAT " ns)\n", 
		    iterations, sum, sum/iterations, min, max);
  }

  return busy;
}

static GstElement*
xmllaunch_parse_cmdline (const gchar **argv) 
{
  GstElement *pipeline = NULL, *e;
  GstXML *xml;
  gboolean err;
  const gchar *arg;
  gchar *element, *property, *value;
  GList *l;
  gint i = 0;
  
  if (!(arg = argv[0])) {
    g_print ("usage: gst-xmllaunch <file.xml> [ element.property=value ... ]\n");
    exit (1);
  }
  
  xml = gst_xml_new ();
  err = gst_xml_parse_file(xml, arg, NULL);
  
  if (err != TRUE) {
    fprintf (stderr, "ERROR: parse of xml file '%s' failed\n", arg);
    exit (1);
  }
  
  l = gst_xml_get_topelements (xml);
  if (!l) {
    fprintf (stderr, "ERROR: no toplevel pipeline element in file '%s'\n", arg);
    exit (1);
  }
    
  if (l->next)
    g_warning ("only one toplevel element is supported at this time");
  
  pipeline = GST_ELEMENT (l->data);
  
  while ((arg = argv[++i])) {
    element = g_strdup (arg);
    property = strchr (element, '.');
    value = strchr (element, '=');
    
    if (!(element < property && property < value)) {
      fprintf (stderr, "ERROR: could not parse command line argument %d: %s", i, element);
      g_free (element);
      exit (1);
    }
    
    *property++ = '\0';
    *value++ = '\0';
    
    e = gst_bin_get_by_name (GST_BIN (pipeline), element);
    if (!e) {
      g_warning ("element named '%s' not found", element);
    } else {
      gst_util_set_object_arg (G_OBJECT (e), property, value);
    }
    g_free (element);
  }
  
  if (!l)
    return NULL;
  else
    return l->data;
}

extern volatile gboolean glib_on_error_halt;
static void fault_restore(void);

static void 
fault_handler (int signum, siginfo_t *si, void *misc)
{
  int spinning = TRUE;

  fault_restore ();

  if (si->si_signo == SIGSEGV) {
    g_print ("Caught SIGSEGV accessing address %p\n", si->si_addr);
  }
  else if (si->si_signo == SIGQUIT){
    g_print ("Caught SIGQUIT\n");
  }
  else {
    g_print ("signo:  %d\n", si->si_signo);
    g_print ("errno:  %d\n", si->si_errno);
    g_print ("code:   %d\n", si->si_code);
  }

  glib_on_error_halt = FALSE;
  g_on_error_stack_trace ("gst-launch");

  wait (NULL);

#if 1
  /* FIXME how do we know if we were run by libtool? */
  g_print ("Spinning.  Please run 'gdb gst-launch %d' to continue debugging, "
  	   "Ctrl-C to quit, or Ctrl-\\ to dump core.\n",
  	    getpid ());
  while (spinning) usleep (1000000);
#else
  /* This spawns a gdb and attaches it to gst-launch. */
  {
    char str[40];
    sprintf (str, "gdb -quiet gst-launch %d", getpid ());
    system (str);
  }

  _exit(0);
#endif

}

static void 
fault_restore (void)
{
  struct sigaction action;

  memset (&action, 0, sizeof (action));
  action.sa_handler = SIG_DFL;

  sigaction(SIGSEGV, &action, NULL);
  sigaction(SIGQUIT, &action, NULL);
}

static void 
fault_setup (void)
{
  struct sigaction action;

  memset (&action, 0, sizeof (action));
  action.sa_sigaction = fault_handler;
  action.sa_flags = SA_SIGINFO;

  sigaction (SIGSEGV, &action, NULL);
  sigaction (SIGQUIT, &action, NULL);
}

int
main(int argc, char *argv[])
{
  /* options */
  gboolean silent = FALSE;
  gboolean no_fault = FALSE;
  gchar *savefile = NULL;
  gchar *exclude_args = NULL;
  struct poptOption options[] = {
    {"silent",	's',  POPT_ARG_NONE|POPT_ARGFLAG_STRIP,   &silent,   0,
     "do not output status information", NULL},
    {"exclude", 'X',  POPT_ARG_STRING|POPT_ARGFLAG_STRIP, &exclude_args,  0,
     "do not output status information of TYPE", "TYPE1,TYPE2,..."},
    {"output",	'o',  POPT_ARG_STRING|POPT_ARGFLAG_STRIP, &savefile, 0,
     "save xml representation of pipeline to FILE and exit", "FILE"},
    {"no_fault", 'f',  POPT_ARG_NONE|POPT_ARGFLAG_STRIP,   &no_fault,   0,
     "Do not install a fault handler", NULL},
    POPT_TABLEEND
  };

  GstElement *pipeline;
  gchar **argvn;
  GError *error = NULL;
  gint res = 0;

  free (malloc (8)); /* -lefence */

  gst_init_with_popt_table (&argc, &argv, options);

  if (!no_fault)
    fault_setup();
  
  /* make a null-terminated version of argv */
  argvn = g_new0 (char*, argc);
  memcpy (argvn, argv+1, sizeof (char*) * (argc-1));
  if (strstr (argv[0], "gst-xmllaunch")) {
    pipeline = xmllaunch_parse_cmdline ((const gchar**)argvn);
  } else {
    pipeline = (GstElement*) gst_parse_launchv ((const gchar**)argvn, &error);
  }
  g_free (argvn);

  if (!pipeline) {
    if (error)
      fprintf(stderr, "ERROR: pipeline could not be constructed: %s\n", error->message);
    else
      fprintf(stderr, "ERROR: pipeline could not be constructed\n");
    exit(1);
  }
  
  if (!silent)
  {
    gchar **exclude_list = exclude_args ? g_strsplit (exclude_args, ",", 0) : NULL;
    g_signal_connect (pipeline, "deep_notify", G_CALLBACK (gst_element_default_deep_notify), exclude_list);
  }
  g_signal_connect (pipeline, "error", G_CALLBACK (gst_element_default_error), NULL);
  
#ifndef GST_DISABLE_LOADSAVE
  if (savefile) {
    gst_xml_write_file (GST_ELEMENT (pipeline), fopen (savefile, "w"));
  }
#endif
  
  if (!savefile) {
    gst_buffer_print_stats();
    gst_event_print_stats();

    fprintf(stderr,"RUNNING pipeline\n");
    if (gst_element_set_state (pipeline, GST_STATE_PLAYING) == GST_STATE_FAILURE) {
      fprintf(stderr,"pipeline doesn't want to play\n");
      res = -1;
      goto end;
    }

    s_clock = gst_bin_get_clock (GST_BIN (pipeline));

    if (!GST_FLAG_IS_SET (GST_OBJECT (pipeline), GST_BIN_SELF_SCHEDULABLE)) {
        g_idle_add (idle_func, pipeline);
        gst_main ();
    } else {
        g_print ("waiting for the state change...\n");
        gst_element_wait_state_change (pipeline);
        g_print ("got the state change...\n");
    }

    gst_element_set_state (pipeline, GST_STATE_NULL);
  }

end:
  gst_buffer_print_stats();
  gst_event_print_stats();

  gst_object_unref (GST_OBJECT (pipeline));

  return res;
}