/* The GIMP -- an image manipulation program
 * Copyright (C) 1995-2001 Spencer Kimball, Peter Mattis, and others
 *
 * 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 "libgimpcolor/gimpcolor.h"
#include "libgimpwidgets/gimpwidgets.h"

#include "tools-types.h"

#include "core/gimp.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "core/gimptoolinfo.h"

#include "widgets/gimpcolorframe.h"
#include "widgets/gimpdialogfactory.h"
#include "widgets/gimphelp-ids.h"
#include "widgets/gimppaletteeditor.h"
#include "widgets/gimptooldialog.h"
#include "widgets/gimpviewabledialog.h"

#include "display/gimpdisplay.h"

#include "gimpcolorpickeroptions.h"
#include "gimpcolorpickertool.h"
#include "gimptoolcontrol.h"

#include "gimp-intl.h"


/*  local function prototypes  */

static void      gimp_color_picker_tool_class_init (GimpColorPickerToolClass *klass);
static void      gimp_color_picker_tool_init       (GimpColorPickerTool      *tool);
static GObject * gimp_color_picker_tool_constructor(GType              type,
                                                    guint              n_params,
                                                    GObjectConstructParam *params);
static void      gimp_color_picker_tool_finalize     (GObject         *object);

static void      gimp_color_picker_tool_control      (GimpTool        *tool,
                                                      GimpToolAction   action,
                                                      GimpDisplay     *gdisp);
static void      gimp_color_picker_tool_modifier_key (GimpTool        *tool,
                                                      GdkModifierType  key,
                                                      gboolean         press,
                                                      GdkModifierType  state,
                                                      GimpDisplay     *gdisp);
static void      gimp_color_picker_tool_oper_update  (GimpTool        *tool,
                                                      GimpCoords      *coords,
                                                      GdkModifierType  state,
                                                      GimpDisplay     *gdisp);

static void      gimp_color_picker_tool_picked       (GimpColorTool   *color_tool,
                                                      GimpColorPickState  pick_state,
                                                      GimpImageType    sample_type,
                                                      GimpRGB         *color,
                                                      gint             color_index);

static void   gimp_color_picker_tool_info_create (GimpColorPickerTool *picker_tool);
static void gimp_color_picker_tool_info_response (GtkWidget           *widget,
                                                  gint                 response_id,
                                                  GimpColorPickerTool *picker_tool);
static void   gimp_color_picker_tool_info_update (GimpColorPickerTool *picker_tool,
                                                  GimpImageType        sample_type,
                                                  GimpRGB             *color,
                                                  gint                 color_index);


static GimpColorToolClass *parent_class = NULL;


void
gimp_color_picker_tool_register (GimpToolRegisterCallback  callback,
                                 gpointer                  data)
{
  (* callback) (GIMP_TYPE_COLOR_PICKER_TOOL,
                GIMP_TYPE_COLOR_PICKER_OPTIONS,
                gimp_color_picker_options_gui,
                0,
                "gimp-color-picker-tool",
                _("Color Picker"),
                _("Pick colors from the image"),
                N_("C_olor Picker"), "O",
                NULL, GIMP_HELP_TOOL_COLOR_PICKER,
                GIMP_STOCK_TOOL_COLOR_PICKER,
                data);
}

GtkType
gimp_color_picker_tool_get_type (void)
{
  static GtkType tool_type = 0;

  if (! tool_type)
    {
      static const GTypeInfo tool_info =
      {
        sizeof (GimpColorPickerToolClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) gimp_color_picker_tool_class_init,
        NULL,           /* class_finalize */
        NULL,           /* class_data     */
        sizeof (GimpColorPickerTool),
        0,              /* n_preallocs    */
        (GInstanceInitFunc) gimp_color_picker_tool_init,
      };

      tool_type = g_type_register_static (GIMP_TYPE_COLOR_TOOL,
                                          "GimpColorPickerTool",
                                          &tool_info, 0);
    }

  return tool_type;
}

static void
gimp_color_picker_tool_class_init (GimpColorPickerToolClass *klass)
{
  GObjectClass       *object_class     = G_OBJECT_CLASS (klass);
  GimpToolClass      *tool_class       = GIMP_TOOL_CLASS (klass);
  GimpColorToolClass *color_tool_class = GIMP_COLOR_TOOL_CLASS (klass);

  parent_class = g_type_class_peek_parent (klass);

  object_class->constructor = gimp_color_picker_tool_constructor;
  object_class->finalize    = gimp_color_picker_tool_finalize;

  tool_class->control       = gimp_color_picker_tool_control;
  tool_class->modifier_key  = gimp_color_picker_tool_modifier_key;
  tool_class->oper_update   = gimp_color_picker_tool_oper_update;

  color_tool_class->picked  = gimp_color_picker_tool_picked;
}

static void
gimp_color_picker_tool_init (GimpColorPickerTool *tool)
{
  GimpColorTool *color_tool = GIMP_COLOR_TOOL (tool);

  color_tool->pick_mode = GIMP_COLOR_PICK_MODE_FOREGROUND;
}

static GObject *
gimp_color_picker_tool_constructor (GType                  type,
                                    guint                  n_params,
                                    GObjectConstructParam *params)
{
  GObject  *object;
  GimpTool *tool;

  object = G_OBJECT_CLASS (parent_class)->constructor (type, n_params, params);

  tool = GIMP_TOOL (object);

  gimp_color_tool_enable (GIMP_COLOR_TOOL (object),
                          GIMP_COLOR_OPTIONS (tool->tool_info->tool_options));

  return object;
}

static void
gimp_color_picker_tool_finalize (GObject *object)
{
  GimpColorPickerTool *picker_tool = GIMP_COLOR_PICKER_TOOL (object);

  if (picker_tool->dialog)
    gimp_color_picker_tool_info_response (NULL, GTK_RESPONSE_CLOSE, picker_tool);

  G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
gimp_color_picker_tool_control (GimpTool       *tool,
                                GimpToolAction  action,
                                GimpDisplay    *gdisp)
{
  GimpColorPickerTool *picker_tool = GIMP_COLOR_PICKER_TOOL (tool);

  switch (action)
    {
    case HALT:
      if (picker_tool->dialog)
        gimp_color_picker_tool_info_response (NULL, GTK_RESPONSE_CLOSE,
                                              picker_tool);
      break;

    default:
      break;
    }

  GIMP_TOOL_CLASS (parent_class)->control (tool, action, gdisp);
}

static void
gimp_color_picker_tool_modifier_key (GimpTool        *tool,
                                     GdkModifierType  key,
                                     gboolean         press,
                                     GdkModifierType  state,
                                     GimpDisplay     *gdisp)
{
  GimpColorPickerOptions *options;

  options = GIMP_COLOR_PICKER_OPTIONS (tool->tool_info->tool_options);

  if (key == GDK_SHIFT_MASK)
    {
      g_object_set (options, "add-to-palette", ! options->add_to_palette,
                    NULL);
    }
  else if (key == GDK_CONTROL_MASK)
    {
       switch (options->pick_mode)
        {
        case GIMP_COLOR_PICK_MODE_NONE:
          break;

        case GIMP_COLOR_PICK_MODE_FOREGROUND:
          g_object_set (options, "pick-mode", GIMP_COLOR_PICK_MODE_BACKGROUND,
                        NULL);
          break;

        case GIMP_COLOR_PICK_MODE_BACKGROUND:
          g_object_set (options, "pick-mode", GIMP_COLOR_PICK_MODE_FOREGROUND,
                        NULL);
          break;
        }

    }
}

static void
gimp_color_picker_tool_oper_update (GimpTool        *tool,
                                    GimpCoords      *coords,
                                    GdkModifierType  state,
                                    GimpDisplay     *gdisp)
{
  GimpColorPickerOptions *options;

  options = GIMP_COLOR_PICKER_OPTIONS (tool->tool_info->tool_options);

  GIMP_COLOR_TOOL (tool)->pick_mode = options->pick_mode;
}

static void
gimp_color_picker_tool_picked (GimpColorTool      *color_tool,
                               GimpColorPickState  pick_state,
                               GimpImageType       sample_type,
                               GimpRGB            *color,
                               gint                color_index)
{
  GimpTool               *tool        = GIMP_TOOL (color_tool);
  GimpColorPickerTool    *picker_tool = GIMP_COLOR_PICKER_TOOL (color_tool);
  GimpColorPickerOptions *options;
  GimpContext            *user_context;

  options = GIMP_COLOR_PICKER_OPTIONS (color_tool->options);

  if (! picker_tool->dialog)
    gimp_color_picker_tool_info_create (picker_tool);

  gimp_color_picker_tool_info_update (picker_tool, sample_type,
                                      color, color_index);

  user_context = gimp_get_user_context (tool->gdisp->gimage->gimp);

  if (options->add_to_palette)
    {
      GimpDialogFactory *dialog_factory;
      GdkScreen         *screen;
      GtkWidget         *dockable;
      GtkWidget         *palette_editor;
      GimpData          *data;

      dialog_factory = gimp_dialog_factory_from_name ("dock");
      screen         = gtk_widget_get_screen (tool->gdisp->shell);

      dockable = gimp_dialog_factory_dialog_raise (dialog_factory,
                                                   screen,
                                                   "gimp-palette-editor",
                                                   -1);

      palette_editor = gtk_bin_get_child (GTK_BIN (dockable));

      data = gimp_data_editor_get_data (GIMP_DATA_EDITOR (palette_editor));

      if (! data)
        {
          data = GIMP_DATA (gimp_context_get_palette (user_context));

          gimp_data_editor_set_data (GIMP_DATA_EDITOR (palette_editor), data);
        }

      gimp_palette_editor_pick_color (GIMP_PALETTE_EDITOR (palette_editor),
                                      color, pick_state);
    }

  switch (options->pick_mode)
    {
    case GIMP_COLOR_PICK_MODE_NONE:
      break;

    case GIMP_COLOR_PICK_MODE_FOREGROUND:
      gimp_context_set_foreground (user_context, color);
      break;

    case GIMP_COLOR_PICK_MODE_BACKGROUND:
      gimp_context_set_background (user_context, color);
      break;
    }
}

static void
gimp_color_picker_tool_info_create (GimpColorPickerTool *picker_tool)
{
  GimpTool  *tool = GIMP_TOOL (picker_tool);
  GtkWidget *hbox;
  GtkWidget *frame;
  GimpRGB    color;

  g_return_if_fail (tool->drawable != NULL);

  picker_tool->dialog = gimp_tool_dialog_new (tool->tool_info,
                                              NULL /* tool->gdisp->shell */,
                                              _("Color Picker Information"),

                                              GTK_STOCK_CLOSE,
                                              GTK_RESPONSE_CLOSE,

                                              NULL);

  gimp_viewable_dialog_set_viewable (GIMP_VIEWABLE_DIALOG (picker_tool->dialog),
                                     GIMP_VIEWABLE (tool->drawable));

  g_signal_connect (picker_tool->dialog, "response",
                    G_CALLBACK (gimp_color_picker_tool_info_response),
                    picker_tool);

  hbox = gtk_hbox_new (FALSE, 6);
  gtk_container_set_border_width (GTK_CONTAINER (hbox), 6);
  gtk_box_pack_start (GTK_BOX (GTK_DIALOG (picker_tool->dialog)->vbox), hbox,
                      FALSE, FALSE, 0);
  gtk_widget_show (hbox);

  picker_tool->color_frame1 = gimp_color_frame_new ();
  gimp_color_frame_set_mode (GIMP_COLOR_FRAME (picker_tool->color_frame1),
                             GIMP_COLOR_FRAME_MODE_PIXEL);
  gtk_box_pack_start (GTK_BOX (hbox), picker_tool->color_frame1,
                      FALSE, FALSE, 0);
  gtk_widget_show (picker_tool->color_frame1);

  picker_tool->color_frame2 = gimp_color_frame_new ();
  gimp_color_frame_set_mode (GIMP_COLOR_FRAME (picker_tool->color_frame2),
                             GIMP_COLOR_FRAME_MODE_RGB);
  gtk_box_pack_start (GTK_BOX (hbox), picker_tool->color_frame2,
                      FALSE, FALSE, 0);
  gtk_widget_show (picker_tool->color_frame2);

  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
  gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, TRUE, 0);
  gtk_widget_show (frame);

  gimp_rgba_set (&color, 0.0, 0.0, 0.0, 0.0);
  picker_tool->color_area =
    gimp_color_area_new (&color,
                         gimp_drawable_has_alpha (tool->drawable) ?
                         GIMP_COLOR_AREA_LARGE_CHECKS :
                         GIMP_COLOR_AREA_FLAT,
                         GDK_BUTTON1_MASK | GDK_BUTTON2_MASK);
  gtk_widget_set_size_request (picker_tool->color_area, 48, -1);
  gtk_drag_dest_unset (picker_tool->color_area);
  gtk_container_add (GTK_CONTAINER (frame), picker_tool->color_area);
  gtk_widget_show (picker_tool->color_area);
}

static void
gimp_color_picker_tool_info_response (GtkWidget           *widget,
                                      gint                 response_id,
                                      GimpColorPickerTool *picker_tool)
{
  gtk_widget_destroy (picker_tool->dialog);

  picker_tool->dialog       = NULL;
  picker_tool->color_area   = NULL;
  picker_tool->color_frame1 = NULL;
  picker_tool->color_frame2 = NULL;
}

static void
gimp_color_picker_tool_info_update (GimpColorPickerTool *picker_tool,
                                    GimpImageType        sample_type,
                                    GimpRGB             *color,
                                    gint                 color_index)
{
  gimp_color_area_set_color (GIMP_COLOR_AREA (picker_tool->color_area), color);

  gimp_color_frame_set_color (GIMP_COLOR_FRAME (picker_tool->color_frame1),
                              sample_type, color, color_index);
  gimp_color_frame_set_color (GIMP_COLOR_FRAME (picker_tool->color_frame2),
                              sample_type, color, color_index);

  if (GTK_WIDGET_VISIBLE (picker_tool->dialog))
    gdk_window_show (picker_tool->dialog->window);
  else
    gtk_widget_show (picker_tool->dialog);
}