#include <gst/gst.h>
#include <stdlib.h>
#include <string.h>

/* FIXME: WTF does this do? */

static guint64 max = 0, min = -1, total = 0;
static guint count = 0;
static guint print_del = 1;
static guint iterations = 0;
static guint mhz = 0;

void handoff_src(GstElement *src, GstBuffer *buf, gpointer user_data) {
  gst_trace_read_tsc(&GST_BUFFER_TIMESTAMP(buf));
}

void handoff_sink(GstElement *sink, GstBuffer *buf, gpointer user_data) {
  guint64 end, d, avg;
  guint avg_ns;

  gst_trace_read_tsc(&end);
  d = end - GST_BUFFER_TIMESTAMP(buf);
  if (d > max) max = d;
  if (d < min) min = d;
  total += d;
  count++;
  avg = total/count;
  avg_ns = (guint)(1000.0*(double)avg/(double)mhz);
  
  if ((count % print_del) == 0) {
    g_print("%07d:%08lld min:%08lld max:%08lld avg:%08lld avg-s:0.%09d\r",
        count, d, min, max, avg, avg_ns);
  }
}

GstElement *identity_add(GstPipeline *pipeline, GstElement *first, int count) {
  GstElement *last, *ident;
  int i;
  char buf[20];

  last = first;

  for (i=0; i<count; i++) {
    snprintf(buf, 20, "identity_%03d", i);
    ident = gst_element_factory_make("identity",buf);
    g_return_val_if_fail(ident != NULL,NULL);
    g_object_set(G_OBJECT(ident),"silent",TRUE,NULL);
    gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(ident));
    gst_pad_connect(gst_element_get_pad(last,"src"),
                    gst_element_get_pad(ident,"sink"));
    last = ident;
  }

  return last;
}

GstElement *fakesrc() {
  GstElement *src;

  src = gst_element_factory_make("fakesrc","src");
  g_return_val_if_fail(src != NULL,NULL);
  g_object_set(G_OBJECT(src),"silent",TRUE,NULL);
  g_object_set(G_OBJECT(src),"num_buffers",iterations,NULL);
  g_signal_connect(G_OBJECT(src),
      "handoff",G_CALLBACK(handoff_src),NULL);

  return src;
}

GstElement *fakesink() {
  GstElement *sink;

  sink = gst_element_factory_make("fakesink","fakesink");
  g_return_val_if_fail(sink != NULL,NULL);
  g_object_set(G_OBJECT(sink),"silent",TRUE,NULL);
  g_signal_connect(G_OBJECT(sink),
      "handoff",G_CALLBACK(handoff_sink),NULL);

  return sink;
}

GstPipeline *simple(int argc, int argi, char *argv[]) {
  GstPipeline *pipeline;
  GstElement *last, *src, *sink;
  int idents;

  if ((argc - argi) < 1) {
    fprintf(stderr, "bad params");
    return NULL;
  }
  idents = atoi(argv[argi]);
  if ((argc - argi) == 2) {
    gst_scheduler_factory_set_default_name (argv[argi+1]);
  }

  pipeline = GST_PIPELINE(gst_pipeline_new("pipeline"));
  g_return_val_if_fail(pipeline != NULL,NULL);

  src = fakesrc();
  gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(src));
  last = identity_add(pipeline, src, idents);
  sink = fakesink();
  gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(sink));
  gst_pad_connect(gst_element_get_pad(last,"src"),
                  gst_element_get_pad(sink,"sink"));

  return pipeline;
}

GstPipeline *queue(int argc, int argi, char *argv[]) {
  GstPipeline *pipeline;
  GstElement *last, *src, *sink, *src_thr, *src_q, *sink_q, *sink_thr;
  int idents;

  if ((argc - argi) < 1) {
    fprintf(stderr, "bad params");
    return NULL;
  }
  idents = atoi(argv[argi]);

  if ((argc - argi) == 2) {
    gst_scheduler_factory_set_default_name (argv[argi+1]);
  }

  pipeline = GST_PIPELINE(gst_pipeline_new("pipeline"));
  g_return_val_if_fail(pipeline != NULL,NULL);

  src_thr = GST_ELEMENT(gst_thread_new("src_thread"));
  g_return_val_if_fail(src_thr != NULL,NULL);

  src = fakesrc();
  g_return_val_if_fail(src != NULL,NULL);
  gst_bin_add(GST_BIN(src_thr),GST_ELEMENT(src));

  src_q = gst_element_factory_make("queue","src_q");
  g_return_val_if_fail(src_q != NULL,NULL);
  gst_bin_add(GST_BIN(src_thr),GST_ELEMENT(src_q));
  gst_pad_connect(gst_element_get_pad(src,"src"),
                  gst_element_get_pad(src_q,"sink"));

  gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(src_thr));

  last = identity_add(pipeline, src_q, idents);

  sink_q = gst_element_factory_make("queue","sink_q");
  g_return_val_if_fail(sink_q != NULL,NULL);
  gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(sink_q));
  gst_pad_connect(gst_element_get_pad(last,"src"),
                  gst_element_get_pad(sink_q,"sink"));

  sink_thr = GST_ELEMENT(gst_thread_new("sink_thread"));
  g_return_val_if_fail(sink_thr != NULL,NULL);

  sink = fakesink();
  g_return_val_if_fail(sink != NULL,NULL);
  gst_bin_add(GST_BIN(sink_thr),GST_ELEMENT(sink));

  gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(sink_thr));

  gst_pad_connect(gst_element_get_pad(sink_q,"src"),
                  gst_element_get_pad(sink,"sink"));

  return pipeline;
}

struct test {
  char *name;
  char *params;
  GstPipeline *(*func)(int argc, int argi, char *argv[]);
};

static struct test tests[] = {
  {"simple", "ident_count [scheduler_name]", simple},
  {"queue", "ident_count [scheduler_name]", queue},
  {NULL, NULL, NULL}
};

int main(int argc,char *argv[]) {
  GstPipeline *pipeline;
  int i;
  char *name;

  gst_init(&argc,&argv);

  if (argc < 3) {
    fprintf(stderr, "usage: %s iterations print_del mhz test_name [test_params...]\n",
        argv[0]);
    for (i=0; tests[i].name; i++) {
      fprintf(stderr, "  %s %s\n", tests[i].name, tests[i].params);
    }
    exit(1);
  } else {
    iterations = atoi(argv[1]);
    print_del = atoi(argv[2]);
    mhz = atoi(argv[3]);
    name = argv[4];
  }

  pipeline = NULL;
  for (i=0; tests[i].name && !pipeline; i++) {
    if (!strcmp(name, tests[i].name)) {
        pipeline = tests[i].func(argc,5,argv);
    }
  }
  g_return_val_if_fail(pipeline != NULL, -1);

  /*xmlSaveFile("lat.gst", gst_xml_write(GST_ELEMENT(pipeline))); */

  gst_element_set_state(GST_ELEMENT(pipeline),GST_STATE_PLAYING);

  while (count < iterations) {
    gst_bin_iterate(GST_BIN(pipeline));
  }
  g_print("\n");

  return 0;
}