#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include "gtk/gtk.h"
#include "tips_dialog.h"
#include "gimprc.h"
#include "interface.h"
#include "wilber.h"

#define TIPS_FILE_NAME "gimp_tips.txt"

static int  tips_dialog_hide (GtkWidget *widget, gpointer data);
static int  tips_show_next (GtkWidget *widget, gpointer data);
static void tips_toggle_update (GtkWidget *widget, gpointer data);
static void read_tips_file(char *filename);

static GtkWidget *tips_dialog = NULL;
static GtkWidget *tips_label;
static char **    tips_text = NULL;
static int        tips_count = 0;
static int        old_show_tips;

void
tips_dialog_create ()
{
  GtkWidget *vbox;
  GtkWidget *hbox1;
  GtkWidget *hbox2;
  GtkWidget *preview;
  GtkWidget *button_close;
  GtkWidget *button_next;
  GtkWidget *button_prev;
  GtkWidget *button_check;
  guchar *   temp;
  guchar *   src;
  guchar *   dest;
  int        x;
  int        y;

  if (tips_count == 0)
    {
      temp = g_malloc (512);
      sprintf (temp, "%s/%s", DATADIR, TIPS_FILE_NAME);
      read_tips_file ((char *)temp);
      g_free (temp);
    }

  if (last_tip >= tips_count || last_tip < 0)
    last_tip = 0;

  if (!tips_dialog)
    {
      tips_dialog = gtk_window_new (GTK_WINDOW_DIALOG);
      gtk_window_set_wmclass (GTK_WINDOW (tips_dialog), "tip_of_the_day", "Gimp");
      gtk_window_set_title (GTK_WINDOW (tips_dialog), "GIMP Tip of the day");
      gtk_window_position (GTK_WINDOW (tips_dialog), GTK_WIN_POS_CENTER);
      gtk_signal_connect (GTK_OBJECT (tips_dialog), "delete_event",
			  GTK_SIGNAL_FUNC (tips_dialog_hide), NULL);
      /* destroy the tips window if the mainlevel gtk_main() function is left */
      gtk_quit_add_destroy (1, GTK_OBJECT (tips_dialog));

      vbox = gtk_vbox_new (FALSE, 0);
      gtk_container_add (GTK_CONTAINER (tips_dialog), vbox);
      gtk_widget_show (vbox);

      hbox1 = gtk_hbox_new (FALSE, 5);
      gtk_container_border_width (GTK_CONTAINER (hbox1), 10);
      gtk_box_pack_start (GTK_BOX (vbox), hbox1, FALSE, TRUE, 0);
      gtk_widget_show (hbox1);

      hbox2 = gtk_hbox_new (FALSE, 5);
      gtk_container_border_width (GTK_CONTAINER (hbox2), 10);
      gtk_box_pack_end (GTK_BOX (vbox), hbox2, FALSE, TRUE, 0);
      gtk_widget_show (hbox2);

      preview = gtk_preview_new (GTK_PREVIEW_COLOR);
      gtk_preview_size (GTK_PREVIEW (preview), wilber_width, wilber_height);
      temp = g_malloc (wilber_width * 3);
      src = (guchar *)wilber_data;
      for (y = 0; y < wilber_height; y++)
	{
	  dest = temp;
	  for (x = 0; x < wilber_width; x++)
	    {
	      HEADER_PIXEL(src, dest);
	      dest += 3;
	    }
	  gtk_preview_draw_row (GTK_PREVIEW (preview), temp,
				0, y, wilber_width); 
	}
      g_free(temp);
      gtk_box_pack_end (GTK_BOX (hbox1), preview, FALSE, TRUE, 3);
      gtk_widget_show (preview);

      tips_label = gtk_label_new (tips_text[last_tip]);
      gtk_label_set_justify (GTK_LABEL (tips_label), GTK_JUSTIFY_LEFT);
      gtk_box_pack_start (GTK_BOX (hbox1), tips_label, TRUE, TRUE, 3);
      gtk_widget_show (tips_label);

      button_close = gtk_button_new_with_label ("Close");
      gtk_signal_connect (GTK_OBJECT (button_close), "clicked",
			  GTK_SIGNAL_FUNC (tips_dialog_hide), NULL);
      gtk_box_pack_end (GTK_BOX (hbox2), button_close, FALSE, TRUE, 0);
      gtk_widget_show (button_close);

      button_next = gtk_button_new_with_label ("Next Tip");
      gtk_signal_connect (GTK_OBJECT (button_next), "clicked",
			  GTK_SIGNAL_FUNC (tips_show_next),
			  (gpointer) "next");
      gtk_box_pack_end (GTK_BOX (hbox2), button_next, FALSE, TRUE, 0);
      gtk_widget_show (button_next);

      button_prev = gtk_button_new_with_label ("Prev. Tip");
      gtk_signal_connect (GTK_OBJECT (button_prev), "clicked",
			  GTK_SIGNAL_FUNC (tips_show_next),
			  (gpointer) "prev");
      gtk_box_pack_end (GTK_BOX (hbox2), button_prev, FALSE, TRUE, 0);
      gtk_widget_show (button_prev);

      button_check = gtk_check_button_new_with_label ("Show tip next time");
      gtk_toggle_button_set_state (GTK_TOGGLE_BUTTON (button_check),
				   show_tips);
      gtk_signal_connect (GTK_OBJECT (button_check), "toggled",
			  GTK_SIGNAL_FUNC (tips_toggle_update),
			  (gpointer) &show_tips);
      gtk_box_pack_start (GTK_BOX (hbox2), button_check, FALSE, TRUE, 0);
      gtk_widget_show (button_check);

      old_show_tips = show_tips;
    }

  if (!GTK_WIDGET_VISIBLE (tips_dialog))
    {
      gtk_widget_show (tips_dialog);
    }
  else
    {
      gdk_window_raise (tips_dialog->window);
    }
}

static int
tips_dialog_hide (GtkWidget *widget,
		  gpointer data)
{
  GList *update = NULL; /* options that should be updated in .gimprc */
  GList *remove = NULL; /* options that should be commented out */

  gtk_widget_hide (tips_dialog);

  update = g_list_append (update, "last-tip-shown"); /* always save this */
  if (show_tips != old_show_tips)
    {
      update = g_list_append (update, "show-tips");
      remove = g_list_append (remove, "dont-show-tips");
      old_show_tips = show_tips;
    }
  last_tip++;
  save_gimprc (&update, &remove);
  last_tip--;
  g_list_free (update);
  g_list_free (remove);

  return TRUE;
}

static int
tips_show_next (GtkWidget *widget,
		gpointer  data)
{
  if (!strcmp ((char *)data, "prev"))
    {
      last_tip--;
      if (last_tip < 0)
	last_tip = tips_count - 1;
    }
  else
    {
      last_tip++;
      if (last_tip >= tips_count)
	last_tip = 0;
    }
  gtk_label_set (GTK_LABEL (tips_label), tips_text[last_tip]);
  return FALSE;
}

static void
tips_toggle_update (GtkWidget *widget,
		    gpointer   data)
{
  int *toggle_val;

  toggle_val = (int *) data;

  if (GTK_TOGGLE_BUTTON (widget)->active)
    *toggle_val = TRUE;
  else
    *toggle_val = FALSE;
}

static void
store_tip (char *str)
{
  tips_count++;
  tips_text = g_realloc(tips_text, sizeof(char *) * tips_count);
  tips_text[tips_count - 1] = str;
}

static void
read_tips_file (char *filename)
{
  FILE *fp;
  char *tip = NULL;
  char *str = NULL;

  fp = fopen (filename, "rt");
  if (!fp)
    {
      store_tip ("Your GIMP tips file appears to be missing!\n"
		 "There should be a file called " TIPS_FILE_NAME " in the\n"
		 "GIMP data directory.  Please check your installation.");
      return;
    }

  str = g_new (char, 1024);
  while (!feof (fp))
    {
      if (!fgets (str, 1024, fp))
	continue;
      
      if (str[0] == '#' || str[0] == '\n')
	{
	  if (tip != NULL)
	    {
	      tip[strlen (tip) - 2] = '\000';
	      store_tip (tip);
	      tip = NULL;
	    }
	}
      else
	{
	  if (tip == NULL)
	    {
	      tip = g_malloc (strlen (str) + 1);
	      strcpy (tip, str);
	    }
	  else
	    {
	      tip = g_realloc (tip, strlen (tip) + strlen (str) + 1);
	      strcat (tip, str);
	    }
	}
    }
  if (tip != NULL)
    store_tip (tip);
  g_free (str);
  fclose (fp);
}
