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/*
     This file is part of GNUnet.
     (C) 2010, 2011 Christian Grothoff (and other contributing authors)

     GNUnet 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, or (at your
     option) any later version.

     GNUnet 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 GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file src/statistics/gnunet-statistics-gtk.c
 * @brief Main function of gnunet-statistics-gtk
 * @author Christian Grothoff
 */
#include "gnunet_gtk.h"

#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_statistics_service.h>
#include <cairo.h>

#define MAX_HISTORY 1280


/**
 * Information about a value we received.
 */
struct HistoricValue
{
  /**
   * A value we recorded.
   */
  uint64_t value;

  /**
   * Time when the value was recorded.
   */
  struct GNUNET_TIME_Absolute timestamp;
};


/**
 * Historic information we recorded for a value.
 */
struct ValueHistory
{

  /**
   * Name of the subsystem.
   */
  char *subsystem;

  /**
   * Name of the statistic.
   */
  char *name;

  /**
   * Recent values for this number.
   */
  struct HistoricValue history[MAX_HISTORY];

  /**
   * Last offset we wrote to in history.
   */
  unsigned int last_history_offset;

  /**
   * Number of valid entries in the history.
   */
  unsigned int history_size;
};


/**
 * Information about how to plot certain values.
 */
struct PlotInfo
{
  /**
   * Subsystem originating the value to plot.
   */
  const char *subsystem;

  /**
   * Name of the value to plot.
   */
  const char *name;

  /**
   * Name of color to use when plotting.
   */
  const char *color_name;
  
};


/**
 * Handle to our main loop.
 */
static struct GNUNET_GTK_MainLoop *ml;

/**
 * Should gnunet-peerinfo-gtk start in tray mode?
 */
static int tray_only;

/**
 * Handle to statistics subsystem.
 */
static struct GNUNET_STATISTICS_Handle *statistics;

/**
 * Map from keys (subsystem+value) to 'struct ValueHistory'.
 */
static struct GNUNET_CONTAINER_MultiHashMap *stat_map;

/**
 * Task that refreshes connection graphic.
 */
static GNUNET_SCHEDULER_TaskIdentifier connection_task;

/**
 * Pixmap where we have the connection image.
 */
static GdkPixmap *connection_pixmap;

/**
 * How often do we refresh?
 */
static struct GNUNET_TIME_Relative refresh_delay;


/**
 * Obtain key for 'stat_map' for a given subsystem and name.
 *
 * @param subsystem subsystem
 * @param name name
 * @param key set to the hash map key
 */
static void
get_key (const char *subsystem,
	 const char *name,
	 GNUNET_HashCode *key)
{
  GNUNET_HashCode h1;
  GNUNET_HashCode h2;
  
  GNUNET_CRYPTO_hash (subsystem, strlen(subsystem), &h1);
  GNUNET_CRYPTO_hash (name, strlen(name), &h2);
  GNUNET_CRYPTO_hash_xor (&h1, &h2, key);
}


/**
 * Callback function to process statistic values.
 *
 * @param cls the 'struct ValueHistory' to update
 * @param subsystem name of subsystem that created the statistic
 * @param name the name of the datum
 * @param value the current value
 * @param is_persistent GNUNET_YES if the value is persistent, GNUNET_NO if not
 * @return GNUNET_OK to continue
 */
static int 
process_value_update (void *cls, const char *subsystem,
		      const char *name, uint64_t value,
		      int is_persistent)
{
  struct ValueHistory *vh = cls;
  GNUNET_HashCode key;

  get_key (subsystem, name, &key);
  if (++vh->last_history_offset == MAX_HISTORY)
    vh->last_history_offset = 0;
  if (vh->history_size < MAX_HISTORY)
    vh->history_size++;
  vh->history[vh->last_history_offset].value = value;
  vh->history[vh->last_history_offset].timestamp = GNUNET_TIME_absolute_get ();  
  return GNUNET_OK;
}


/**
 * Begin monitoring a particular value.
 *
 * @param subsystem name of subsystem that created the statistic
 * @param name the name of the datum
 */
static void
monitor (const char *subsystem,
	 const char *name)
{
  GNUNET_HashCode key;
  struct ValueHistory *vh;

  get_key (subsystem, name, &key);
  vh = GNUNET_CONTAINER_multihashmap_get (stat_map, &key);
  if (NULL != vh)
    return;
  vh = GNUNET_malloc (sizeof (struct ValueHistory));
  vh->subsystem = GNUNET_strdup (subsystem);
  vh->name = GNUNET_strdup (name);
  GNUNET_assert (GNUNET_OK ==
		 GNUNET_CONTAINER_multihashmap_put (stat_map,
						    &key,
						    vh,
						    GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
  GNUNET_STATISTICS_watch (statistics,
			   subsystem,
			   name,
			   &process_value_update,
			   vh);
}


/**
 * Get an object from the main window.
 *
 * @param name name of the object
 * @return NULL on error
 */
static GObject *
get_object (const char *name)
{
  return GNUNET_GTK_main_loop_get_object (ml, name);
}


/**
 * Actually draw a plot based on collected data.
 *
 * @param widget size and style information for the plot
 * @param info what to draw
 * @return pixmap with the drawing
 */
static GdkPixmap *
create_plot (GtkWidget *widget,
	     const struct PlotInfo *info)
{
  GdkPixmap *ret;
  GdkGC *gc;
  unsigned int i;
  GNUNET_HashCode key;
  struct ValueHistory *vh;
  GdkColor color;
  GdkColormap *colormap;

  ret = gdk_pixmap_new (widget->window,
			widget->allocation.width,
			widget->allocation.height,
			gtk_widget_get_visual (widget)->depth);
  colormap = gdk_window_get_colormap (widget->window);
  gc = gdk_gc_new (widget->window);
  gdk_gc_copy (gc, widget->style->white_gc);
  gdk_color_parse ("black", &color);
  gdk_colormap_alloc_color (colormap, &color, TRUE, TRUE);
  gdk_gc_set_foreground (gc, &color);
  gdk_draw_rectangle (GDK_DRAWABLE (ret),
                      widget->style->black_gc,
                      TRUE, 0, 0,
                      widget->allocation.width, 
		      widget->allocation.height);
  for (i=0; NULL != info[i].subsystem; i++)
  {
    get_key (info[i].subsystem, info[i].name, &key);
    vh = GNUNET_CONTAINER_multihashmap_get (stat_map, &key);
    if (NULL == vh)
      continue;
    gdk_color_parse (info[i].color_name, &color);
    gdk_colormap_alloc_color (colormap, &color, TRUE, TRUE);
    gdk_gc_set_foreground (gc, &color);
    
    

  }

  // FIXME
  return ret;
}


/**
 * Redraw the 'connection_pixmap'.
 *
 * @param widget where to render it to in the end (also for size to use)
 */
static void
plot_connection_graph (GtkWidget *widget)
{
  static const struct PlotInfo connection_data[] = 
    {
      { "core", "entries in session map", "white" },
      { NULL, NULL, NULL}
    };
  if (NULL != connection_pixmap)
  {
    gdk_pixmap_unref (connection_pixmap);
    connection_pixmap = NULL;
  }
  connection_pixmap = create_plot (widget,
				   connection_data);
}


/**
 * Part of the connection graph got re-exposed; refresh the area.
 *
 * @param widget the drawing area of the connection graph
 * @param event expose event
 * @param data_ptr unused
 * @return FALSE
 */
gint
GNUNET_STATISTICS_connection_graph_expose (GtkWidget * widget,
					   GdkEventExpose * event, 
					   gpointer data_ptr)
{
  gdk_draw_pixmap (widget->window,
                   widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
                   connection_pixmap,
                   event->area.x, event->area.y,
                   event->area.x, event->area.y,
                   event->area.width, event->area.height);
  return FALSE;
}


/**
 * The window size was changed, forcing us to re-draw the connection
 * graph.
 *
 * @param widget the drawing area of the connection graph
 * @param event configure event
 * @param data_ptr unused
 * @return TRUE
 */
gint
GNUNET_STATISTICS_connection_graph_configure (GtkWidget * widget,
					      GdkEventConfigure * event, 
					      gpointer data_ptr)
{
  plot_connection_graph (widget);
  gdk_draw_pixmap (widget->window,
                   widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
                   connection_pixmap,
                   0, 0,
                   0, 0,
                   widget->allocation.width, widget->allocation.height);
  return TRUE;
}


/**
 * Refresh the 'connections' graphic.
 *
 * @param cls closure
 * @param tc scheduler context
 */
static void
refresh_connections (void *cls,
		     const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  GtkWidget *area;

  connection_task = GNUNET_SCHEDULER_add_delayed (refresh_delay,
						  &refresh_connections,
						  NULL);
  area = GTK_WIDGET (get_object ("GNUNET_STATISTICS_GTK_main_notebook_connectivity_drawingarea"));
  plot_connection_graph (area);
  gdk_draw_pixmap (area->window,
                   area->style->fg_gc[GTK_WIDGET_STATE (area)],
                   connection_pixmap,
                   0, 0,
                   0, 0,
                   area->allocation.width, 
		   area->allocation.height);
}


/**
 * Free entries in the value history.
 *
 * @param cls unused
 * @param key unused
 * @param value 'struct ValueHistory' to free
 * @return GNUNET_OK (continue iteration)
 */
static int
free_history (void *cls,
	      const GNUNET_HashCode *key,
	      void *value)
{
  struct ValueHistory *vh = value;

  GNUNET_free (vh->subsystem);
  GNUNET_free (vh->name);
  GNUNET_free (vh);
  return GNUNET_OK;
}


/**
 * Task run on shutdown.
 *
 * @param cls unused
 * @param tc scheduler context, unused
 */
static void
shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  GNUNET_STATISTICS_destroy (statistics, GNUNET_NO);
  statistics = NULL;
  GNUNET_CONTAINER_multihashmap_iterate (stat_map, &free_history, NULL);
  GNUNET_CONTAINER_multihashmap_destroy (stat_map);
  stat_map = NULL;
}


/**
 * Callback invoked if the application is supposed to exit.
 */
void
GNUNET_STATISTICS_GTK_quit_cb (GObject * object, gpointer user_data)
{
  GNUNET_GTK_tray_icon_destroy ();
  GNUNET_GTK_main_loop_quit (ml);
  if (connection_task != GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel (connection_task);
    connection_task = GNUNET_SCHEDULER_NO_TASK;
  }
  if (NULL != connection_pixmap)
  {
    gdk_pixmap_unref (connection_pixmap);
    connection_pixmap = NULL;
  }
  GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
}


/**
 * Actual main function run right after GNUnet's scheduler
 * is initialized.  Initializes up GTK and Glade.
 */
static void
run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  static const struct 
  { 
    const char *subsystem; 
    const char *name; 
  } moma[] =
      {
	{ "core", "entries in session map" },
	{ NULL, NULL }
      };
  GtkWidget *main_window;
  unsigned int i;

  ml = cls;
  statistics = GNUNET_STATISTICS_create ("gnunet-statistics-gtk",
					 GNUNET_GTK_main_loop_get_configuration (ml));
  if (NULL == statistics)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
		_("Failed to initiate connection with statistics service\n"));
    return;
  }
  stat_map = GNUNET_CONTAINER_multihashmap_create (128);
  GNUNET_GTK_set_icon_search_path ();
  GNUNET_GTK_setup_nls ();
  refresh_delay = GNUNET_TIME_UNIT_SECONDS; /* fixme: make option / cmd-line option */

  i = 0;
  while (moma[i].subsystem != NULL)
  {
    monitor (moma[i].subsystem,
	     moma[i].name);
    i++;
  }
  
  /* setup main window */
  main_window = GTK_WIDGET (get_object ("GNUNET_STATISTICS_GTK_main_window"));
  gtk_window_maximize (GTK_WINDOW (main_window));
  GNUNET_GTK_tray_icon_create (GTK_WINDOW (main_window),
                               "gnunet-gtk" /* FIXME: different icon? */ ,
                               "gnunet-statistics-gtk");

  /* FIXME: only schedule this task if the respective tab is open!? */
  connection_task = GNUNET_SCHEDULER_add_now (&refresh_connections, NULL);

  /* make GUI visible */
  if (!tray_only)
  {
    gtk_widget_show (main_window);
    gtk_window_present (GTK_WINDOW (main_window));
  }
}


int
main (int argc, char *const *argv)
{
  static struct GNUNET_GETOPT_CommandLineOption options[] = {
    {'t', "tray", NULL,
     gettext_noop ("start in tray mode"), 0,
     &GNUNET_GETOPT_set_one, &tray_only},
    GNUNET_GETOPT_OPTION_END
  };

  if (GNUNET_OK !=
      GNUNET_GTK_main_loop_start ("gnunet-statistics-gtk",
                                  "GTK GUI for viewing GNUnet statistics", argc,
                                  argv, options,
                                  "gnunet_statistics_gtk_main_window.glade",
                                  &run))
    return 1;
  return 0;
}


/* end of gnunet-statistics-gtk.c */