/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "config.h"

#include <gtk/gtk.h>

#include "libgimpwidgets/gimpwidgets.h"

#include "gui-types.h"

#include "core/gimp.h"
#include "core/gimpcontext.h"
#include "core/gimpimage.h"
#include "core/gimpimage-crop.h"
#include "core/gimpimage-duplicate.h"
#include "core/gimpimage-mask.h"
#include "core/gimpimage-merge.h"
#include "core/gimpimage-resize.h"
#include "core/gimpimage-scale.h"
#include "core/gimpimage-undo.h"

#include "widgets/gimpviewabledialog.h"

#include "display/gimpdisplay.h"
#include "display/gimpdisplayshell.h"
#include "display/gimpprogress.h"

#include "convert-dialog.h"
#include "image-commands.h"
#include "resize-dialog.h"

#include "libgimp/gimpintl.h"


typedef struct
{
  Resize      *resize;
  GimpDisplay *gdisp;
  GimpImage   *gimage;
} ImageResize;


#define return_if_no_display(gdisp,data) \
  if (GIMP_IS_DISPLAY (data)) \
    gdisp = data; \
  else if (GIMP_IS_GIMP (data)) \
    gdisp = gimp_context_get_display (gimp_get_user_context (GIMP (data))); \
  else \
    gdisp = NULL; \
  if (! gdisp) \
    return

#define return_if_no_image(gimage,data) \
  if (GIMP_IS_DISPLAY (data)) \
    gimage = ((GimpDisplay *) data)->gimage; \
  else if (GIMP_IS_GIMP (data)) \
    gimage = gimp_context_get_image (gimp_get_user_context (GIMP (data))); \
  else \
    gimage = NULL; \
  if (! gimage) \
    return


/*  local functions  */

static void     image_resize_callback        (GtkWidget   *widget,
					      gpointer     data);
static void     image_scale_callback         (GtkWidget   *widget,
					      gpointer     data);
static void     image_scale_warn_callback    (GtkWidget   *widget,
					      gboolean     do_scale,
					      gpointer     data);
static void     image_scale_implement        (ImageResize *image_scale);


/*  public functions  */

void
image_convert_rgb_cmd_callback (GtkWidget *widget,
				gpointer   data)
{
  GimpImage *gimage;
  return_if_no_image (gimage, data);

  convert_to_rgb (gimage);
}

void
image_convert_grayscale_cmd_callback (GtkWidget *widget,
				      gpointer   data)
{
  GimpImage *gimage;
  return_if_no_image (gimage, data);

  convert_to_grayscale (gimage);
}

void
image_convert_indexed_cmd_callback (GtkWidget *widget,
				    gpointer   data)
{
  GimpImage *gimage;
  return_if_no_image (gimage, data);

  convert_to_indexed (gimage);
}

void
image_resize_cmd_callback (GtkWidget *widget,
			   gpointer   data)
{
  GimpDisplay *gdisp;
  GimpImage   *gimage;
  ImageResize *image_resize;
  return_if_no_display (gdisp, data);

  gimage = gdisp->gimage;

  image_resize = g_new0 (ImageResize, 1);

  image_resize->gdisp  = gdisp;
  image_resize->gimage = gimage;

  image_resize->resize =
    resize_widget_new (GIMP_VIEWABLE (gimage),
                       ResizeWidget,
                       gimage->width,
                       gimage->height,
                       gimage->xresolution,
                       gimage->yresolution,
                       gimage->unit,
                       GIMP_DISPLAY_SHELL (gdisp->shell)->dot_for_dot,
                       G_CALLBACK (image_resize_callback),
                       image_resize);

  g_signal_connect_object (gdisp, "disconnect",
                           G_CALLBACK (gtk_widget_destroy),
                           image_resize->resize->resize_shell,
                           G_CONNECT_SWAPPED);

  g_object_weak_ref (G_OBJECT (image_resize->resize->resize_shell),
		     (GWeakNotify) g_free,
		     image_resize);

  gtk_widget_show (image_resize->resize->resize_shell);
}

void
image_scale_cmd_callback (GtkWidget *widget,
			  gpointer   data)
{
  GimpDisplay *gdisp;
  GimpImage   *gimage;
  ImageResize *image_scale;
  return_if_no_display (gdisp, data);

  gimage = gdisp->gimage;

  image_scale = g_new0 (ImageResize, 1);

  image_scale->gdisp  = gdisp;
  image_scale->gimage = gimage;

  image_scale->resize =
    resize_widget_new (GIMP_VIEWABLE (gimage),
                       ScaleWidget,
                       gimage->width,
                       gimage->height,
                       gimage->xresolution,
                       gimage->yresolution,
                       gimage->unit,
                       GIMP_DISPLAY_SHELL (gdisp->shell)->dot_for_dot,
                       G_CALLBACK (image_scale_callback),
                       image_scale);

  g_signal_connect_object (gdisp, "disconnect",
                           G_CALLBACK (gtk_widget_destroy),
                           image_scale->resize->resize_shell,
                           G_CONNECT_SWAPPED);

  g_object_weak_ref (G_OBJECT (image_scale->resize->resize_shell),
		     (GWeakNotify) g_free,
		     image_scale);

  gtk_widget_show (image_scale->resize->resize_shell);
}

void
image_crop_cmd_callback (GtkWidget *widget,
                         gpointer   data)
{
  GimpDisplay *gdisp;
  gint         x1, y1, x2, y2;
  return_if_no_display (gdisp, data);

  if (! gimp_image_mask_bounds (gdisp->gimage, &x1, &y1, &x2, &y2))
    {
      g_message (_("Cannot crop because the current selection is empty."));
      return;
    }

  gimp_image_crop (gdisp->gimage, x1, y1, x2, y2, FALSE, TRUE);
}

void
image_duplicate_cmd_callback (GtkWidget *widget,
			      gpointer   data)
{
  GimpImage *gimage;
  GimpImage *new_gimage;
  return_if_no_image (gimage, data);

  new_gimage = gimp_image_duplicate (gimage);

  gimp_create_display (new_gimage->gimp, new_gimage, 0x0101);

  g_object_unref (new_gimage);
}

void
image_merge_layers_cmd_callback (GtkWidget *widget,
                                 gpointer   data)
{
  GimpImage *gimage;
  return_if_no_image (gimage, data);

  image_layers_merge_query (gimage, TRUE);
}

void
image_flatten_image_cmd_callback (GtkWidget *widget,
                                  gpointer   data)
{
  GimpImage *gimage;
  return_if_no_image (gimage, data);

  gimp_image_flatten (gimage);
  gimp_image_flush (gimage);
}


/****************************/
/*  The layer merge dialog  */
/****************************/

typedef struct _LayerMergeOptions LayerMergeOptions;

struct _LayerMergeOptions
{
  GtkWidget     *query_box;
  GimpImage     *gimage;
  gboolean       merge_visible;
  GimpMergeType  merge_type;
};

static void
image_layers_merge_query_ok_callback (GtkWidget *widget,
                                      gpointer   data)
{
  LayerMergeOptions *options;
  GimpImage         *gimage;

  options = (LayerMergeOptions *) data;
  if (! (gimage = options->gimage))
    return;

  if (options->merge_visible)
    gimp_image_merge_visible_layers (gimage, options->merge_type);

  gimp_image_flush (gimage);

  gtk_widget_destroy (options->query_box);
}

void
image_layers_merge_query (GimpImage   *gimage,
                          /*  if FALSE, anchor active layer  */
                          gboolean     merge_visible)
{
  LayerMergeOptions *options;
  GtkWidget         *vbox;
  GtkWidget         *frame;

  /*  The new options structure  */
  options = g_new (LayerMergeOptions, 1);
  options->gimage        = gimage;
  options->merge_visible = merge_visible;
  options->merge_type    = GIMP_EXPAND_AS_NECESSARY;

  /* The dialog  */
  options->query_box =
    gimp_viewable_dialog_new (GIMP_VIEWABLE (gimage),
                              _("Merge Layers"), "layers_merge_options",
                              GIMP_STOCK_MERGE_DOWN,
                              _("Layers Merge Options"),
                              gimp_standard_help_func,
                              "dialogs/layers/merge_visible_layers.html",

                              GTK_STOCK_CANCEL, gtk_widget_destroy,
                              NULL, 1, NULL, FALSE, TRUE,

                              GTK_STOCK_OK, image_layers_merge_query_ok_callback,
                              options, NULL, NULL, TRUE, FALSE,

                              NULL);

  g_object_weak_ref (G_OBJECT (options->query_box),
		     (GWeakNotify) g_free,
		     options);

  /*  The main vbox  */
  vbox = gtk_vbox_new (FALSE, 2);
  gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
  gtk_container_add (GTK_CONTAINER (GTK_DIALOG (options->query_box)->vbox),
		     vbox);

  frame =
    gimp_radio_group_new2 (TRUE,
                           merge_visible ?
                           _("Final, Merged Layer should be:") :
                           _("Final, Anchored Layer should be:"),
                           G_CALLBACK (gimp_radio_button_update),
                           &options->merge_type,
                           GINT_TO_POINTER (options->merge_type),

                           _("Expanded as necessary"),
                           GINT_TO_POINTER (GIMP_EXPAND_AS_NECESSARY), NULL,

                           _("Clipped to image"),
                           GINT_TO_POINTER (GIMP_CLIP_TO_IMAGE), NULL,

                           _("Clipped to bottom layer"),
                           GINT_TO_POINTER (GIMP_CLIP_TO_BOTTOM_LAYER), NULL,

                           NULL);

  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
  gtk_widget_show (frame);

  gtk_widget_show (vbox);
  gtk_widget_show (options->query_box);
}


/*  private functions  */

static void
image_resize_callback (GtkWidget *widget,
		       gpointer   data)
{
  ImageResize *image_resize;

  image_resize = (ImageResize *) data;

  g_assert (image_resize != NULL);
  g_assert (image_resize->gimage != NULL);

  gtk_widget_set_sensitive (image_resize->resize->resize_shell, FALSE);

  if (image_resize->resize->width > 0 &&
      image_resize->resize->height > 0) 
    {
      gimp_image_resize (image_resize->gimage,
			 image_resize->resize->width,
			 image_resize->resize->height,
			 image_resize->resize->offset_x,
			 image_resize->resize->offset_y);
      gimp_image_flush (image_resize->gimage);
    }
  else 
    {
      g_message (_("Resize Error: Both width and height must be "
		   "greater than zero."));
    }

  gtk_widget_destroy (image_resize->resize->resize_shell);
}

static void
image_scale_callback (GtkWidget *widget,
		      gpointer   data)
{
  ImageResize *image_scale;

  image_scale = (ImageResize *) data;

  g_assert (image_scale != NULL);
  g_assert (image_scale->gimage != NULL);

  gtk_widget_set_sensitive (image_scale->resize->resize_shell, FALSE);

  if (gimp_image_check_scaling (image_scale->gimage,
				image_scale->resize->width,
				image_scale->resize->height))
    {
      image_scale_implement (image_scale);

      gtk_widget_destroy (image_scale->resize->resize_shell);
    }
  else
    {
      GtkWidget *dialog;

      dialog =
	gimp_query_boolean_box (_("Layer Too Small"),
				gimp_standard_help_func,
				"dialogs/scale_layer_warn.html",
				GTK_STOCK_DIALOG_QUESTION,
				_("The chosen image size will shrink\n"
				  "some layers completely away.\n"
				  "Is this what you want?"),
				GTK_STOCK_OK, GTK_STOCK_CANCEL,
				G_OBJECT (image_scale->resize->resize_shell),
				"destroy",
				image_scale_warn_callback,
				image_scale);
      gtk_widget_show (dialog);
    }
}

static void
image_scale_warn_callback (GtkWidget *widget,
			   gboolean   do_scale,
			   gpointer   data)
{
  ImageResize *image_scale;
  GimpImage   *gimage;

  image_scale = (ImageResize *) data;
  gimage      = image_scale->gimage;

  if (do_scale) /* User doesn't mind losing layers... */
    {
      image_scale_implement (image_scale);

      gtk_widget_destroy (image_scale->resize->resize_shell);
    }
  else
    {
      gtk_widget_set_sensitive (image_scale->resize->resize_shell, TRUE);
    }
}

static void
image_scale_implement (ImageResize *image_scale)
{
  GimpImage *gimage        = NULL;
  gboolean   display_flush = FALSE;  /* this is a bit ugly: 
					we hijack the flush variable 
					to check if an undo_group was 
					already started */

  g_assert (image_scale != NULL);
  g_assert (image_scale->gimage != NULL);

  gimage = image_scale->gimage;

  if (image_scale->resize->resolution_x != gimage->xresolution ||
      image_scale->resize->resolution_y != gimage->yresolution)
    {
      gimp_image_undo_group_start (gimage, GIMP_UNDO_GROUP_IMAGE_SCALE,
                                   _("Scale Image"));
	  
      gimp_image_set_resolution (gimage,
				 image_scale->resize->resolution_x,
				 image_scale->resize->resolution_y);

      display_flush = TRUE;
    }

  if (image_scale->resize->unit != gimage->unit)
    {
      if (! display_flush)
	gimp_image_undo_group_start (gimage, GIMP_UNDO_GROUP_IMAGE_SCALE,
                                     _("Scale Image"));

      gimp_image_set_unit (gimage, image_scale->resize->unit);

      display_flush = TRUE;
    }

  if (image_scale->resize->width != gimage->width ||
      image_scale->resize->height != gimage->height)
    {
      if (image_scale->resize->width > 0 &&
	  image_scale->resize->height > 0) 
	{
          GimpProgress *progress;

	  if (! display_flush)
	    gimp_image_undo_group_start (gimage, GIMP_UNDO_GROUP_IMAGE_SCALE,
                                         _("Scale Image"));

          progress = gimp_progress_start (image_scale->gdisp,
                                          _("Scaling..."),
                                          TRUE, NULL, NULL);

	  gimp_image_scale (gimage,
			    image_scale->resize->width,
			    image_scale->resize->height,
                            image_scale->resize->interpolation,
                            gimp_progress_update_and_flush, progress);

          gimp_progress_end (progress);

	  display_flush = TRUE;
	}
      else
	{
	  g_message (_("Scale Error: Both width and height must be "
		       "greater than zero."));
	  return;
	}
    }

  if (display_flush)
    {
      gimp_image_undo_group_end (gimage);
      gimp_image_flush (gimage);
    }
}
