#include <stdio.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include <gst/gst.h>

int main( int argc, char *argv[] )
{
    gtk_init( NULL, NULL );
    gst_init( NULL, NULL );
    void infos_on_file( GtkButton *, gpointer );
    GtkWidget *win = gtk_window_new( GTK_WINDOW_TOPLEVEL );
    GtkWidget *entry = gtk_entry_new();
    GtkWidget *hbox = gtk_box_new( GTK_ORIENTATION_HORIZONTAL, 3 );
    GtkWidget *but  = gtk_button_new_from_stock( GTK_STOCK_OK );
    gtk_entry_set_width_chars( GTK_ENTRY( entry ), 25 );
    gtk_box_pack_start( GTK_BOX( hbox ), entry, TRUE, TRUE, 2 );
    gtk_box_pack_start( GTK_BOX( hbox ), but , TRUE, TRUE, 2 );
    gtk_widget_set_hexpand( hbox, FALSE );
    gtk_widget_set_vexpand( hbox, FALSE );
    gtk_widget_set_halign( hbox, GTK_ALIGN_START );
    gtk_widget_set_valign( hbox, GTK_ALIGN_START );
    gtk_entry_set_placeholder_text( GTK_ENTRY( entry ), "enter a file path");
    gtk_container_add( GTK_CONTAINER( win ), hbox );
    g_signal_connect( G_OBJECT( but ), "clicked", G_CALLBACK( infos_on_file ), (gpointer)entry );
    gtk_widget_show_all( win );
    gtk_main();
    printf("Hello world!\n");
    return 0;
}


void infos_on_file( GtkButton *but, gpointer data )
{
  guint i = 0, j = 0, k = 0;
  GstStructure *stru = NULL;
  gchar *fieldname = NULL, *stru_name = NULL;
  gchar *text = ( gchar * )gtk_entry_get_text( GTK_ENTRY( data ) );
  GstElementFactory *fact = gst_element_factory_find("filesrc");
  if( fact == NULL )printf( "NULL\n");
  GstElement *element = gst_element_factory_make( "filesrc", "insp" );
  if( element == NULL )
  {
      printf("element is null ");
      return ;
  }
  g_object_set_valist( G_OBJECT( element ), "location", text );
  GstPad* pad = gst_element_get_static_pad( element, "src" );
  GstCaps *caps = gst_pad_get_caps( pad );
  guint siz = gst_caps_get_size( caps );
  for( i = 0; i < siz; i++ )
    {
       stru = gst_caps_get_structure( caps, i );
       stru_name = ( gchar *)gst_structure_get_name( stru );
       printf(" caps: %s\n", stru_name );
       k    = gst_structure_n_fields( stru );
       for( j = 0; j < k; j++ )
        {
            fieldname = ( gchar * )gst_structure_nth_field_name( stru, j );
            printf( "%dièmé fieldname: %s\n", j, fieldname );
        }
        printf("\n\n");
    }
}