/*
 * This is a plug-in for the GIMP.
 *
 * Generates clickable image maps.
 *
 * Copyright (C) 1998-1999 Maurits Rijk  lpeek.mrijk@consunet.nl
 *
 * 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 "imap_cmd_create.h"
#include "imap_command.h"
#include "imap_default_dialog.h"
#include "imap_grid.h"
#include "imap_main.h"
#include "imap_object.h"
#include "imap_string.h"

typedef struct {
   ObjectListCallbackFunc_t func;
   gpointer data;
} ObjectListCB_t;

static ObjectList_t *_paste_buffer;

static gpointer
object_list_callback_add(ObjectListCallback_t *list, 
			 ObjectListCallbackFunc_t func, gpointer data)
{
   ObjectListCB_t *cb = g_new(ObjectListCB_t, 1);
   cb->func = func;
   cb->data = data;
   list->list = g_list_append(list->list, cb);
   return cb;
}

static void
object_list_callback_remove(ObjectListCallback_t *list, gpointer id)
{
   list->list = g_list_remove(list->list, id);
}

static void 
object_list_callback_call(ObjectListCallback_t *list, Object_t *obj)
{
   GList *p;
   for (p = list->list; p; p = p->next) {
      ObjectListCB_t *cb = (ObjectListCB_t*) p->data;
      cb->func(obj, cb->data);
   }
}

gpointer
object_list_add_changed_cb(ObjectList_t *list, ObjectListCallbackFunc_t func,
			   gpointer data)
{
   return object_list_callback_add(&list->changed_cb, func, data);
}

gpointer
object_list_add_update_cb(ObjectList_t *list, ObjectListCallbackFunc_t func,
			  gpointer data)
{
   return object_list_callback_add(&list->update_cb, func, data);
}

gpointer
object_list_add_add_cb(ObjectList_t *list, ObjectListCallbackFunc_t func, 
		       gpointer data)
{
   return object_list_callback_add(&list->add_cb, func, data);
}

gpointer
object_list_add_remove_cb(ObjectList_t *list, ObjectListCallbackFunc_t func, 
			  gpointer data)
{
   return object_list_callback_add(&list->remove_cb, func, data);
}

gpointer
object_list_add_select_cb(ObjectList_t *list, ObjectListCallbackFunc_t func, 
			  gpointer data)
{
   return object_list_callback_add(&list->select_cb, func, data);
}

gpointer
object_list_add_move_cb(ObjectList_t *list, ObjectListCallbackFunc_t func, 
			gpointer data)
{
   return object_list_callback_add(&list->move_cb, func, data);
}

gpointer
object_list_add_geometry_cb(ObjectList_t *list, ObjectListCallbackFunc_t func, 
			    gpointer data)
{
   return object_list_callback_add(&list->geometry_cb, func, data);
}

gpointer
paste_buffer_add_add_cb(ObjectListCallbackFunc_t func, gpointer data)
{
   if (!_paste_buffer)
      _paste_buffer = make_object_list();
   return object_list_callback_add(&_paste_buffer->add_cb, func, data);
}

gpointer
paste_buffer_add_remove_cb(ObjectListCallbackFunc_t func, gpointer data)
{
   if (!_paste_buffer)
      _paste_buffer = make_object_list();
   return object_list_callback_add(&_paste_buffer->remove_cb, func, data);
}

void 
object_list_remove_add_cb(ObjectList_t *list, gpointer id)
{
   object_list_callback_remove(&list->add_cb, id);
}

void 
object_list_remove_select_cb(ObjectList_t *list, gpointer id)
{
   object_list_callback_remove(&list->select_cb, id);
}

void 
object_list_remove_remove_cb(ObjectList_t *list, gpointer id)
{
   object_list_callback_remove(&list->remove_cb, id);
}

void 
object_list_remove_move_cb(ObjectList_t *list, gpointer id)
{
   object_list_callback_remove(&list->move_cb, id);
}

Object_t*
object_init(Object_t *obj, ObjectClass_t *class)
{
   obj->class = class;
   obj->refcount = 1;
   obj->selected = FALSE;
   obj->locked = FALSE;
   obj->url = g_strdup("");
   obj->target = g_strdup("");
   obj->comment = g_strdup("");
   obj->mouse_over = g_strdup("");
   obj->mouse_out = g_strdup("");
   obj->focus = g_strdup("");
   obj->blur = g_strdup("");
   return obj;
}

static void
object_destruct(Object_t *obj)
{
   if (obj->class->destruct)
      obj->class->destruct(obj);
   g_free(obj->url);
   g_free(obj->target);
   g_free(obj->comment);
   g_free(obj->mouse_over);
   g_free(obj->mouse_out);
   g_free(obj->focus);
   g_free(obj->blur);
   g_free(obj);
}

Object_t*
object_ref(Object_t *obj)
{
   obj->refcount++;
   return obj;
}

void 
object_unref(Object_t *obj)
{
   if (!--obj->refcount)
      object_destruct(obj);
}

Object_t*
object_clone(Object_t *obj)
{
   Object_t *clone = obj->class->clone(obj); 
   clone->class = obj->class;
   clone->refcount = 1;
   clone->selected = obj->selected;
   clone->locked = FALSE;
   clone->url = g_strdup(obj->url);
   clone->target = g_strdup(obj->target);
   clone->comment = g_strdup(obj->comment);
   clone->mouse_over = g_strdup(obj->mouse_over);
   clone->mouse_out = g_strdup(obj->mouse_out);
   clone->focus = g_strdup(obj->focus);
   clone->blur = g_strdup(obj->blur);  
   return clone;
}

Object_t*
object_copy(Object_t *src, Object_t *des)
{
   des->class = src->class;
   des->selected = src->selected;
   des->locked = FALSE;
   g_strreplace(&des->url, src->url);
   g_strreplace(&des->target, src->target);
   g_strreplace(&des->comment, src->comment);
   g_strreplace(&des->mouse_over, src->mouse_over);
   g_strreplace(&des->mouse_out, src->mouse_out);
   g_strreplace(&des->focus, src->focus);
   g_strreplace(&des->blur, src->blur);
   return des;
}

Object_t*
object_assign(Object_t *obj, Object_t *des)
{
   return obj->class->assign(obj, des);
}

void 
object_draw(Object_t *obj, GdkWindow *window)
{
   PreferencesData_t *preferences = get_preferences();
   GdkGC *gc = (obj->selected) ? preferences->selected_gc 
      : preferences->normal_gc;
   obj->class->draw(obj, window, gc);
   if (obj->selected && preferences->show_area_handle)
      obj->class->draw_sashes(obj, window, gc);
}

void 
object_edit(Object_t *obj, gboolean add)
{
   if (!obj->class->info_dialog)
      obj->class->info_dialog = create_edit_area_info_dialog(obj);
   edit_area_info_dialog_show(obj->class->info_dialog, obj, add);
}

void 
object_select(Object_t *obj)
{
   obj->selected = TRUE;
   object_list_callback_call(&obj->list->select_cb, obj);
}

void 
object_unselect(Object_t *obj)
{
   obj->selected = FALSE;
   object_list_callback_call(&obj->list->select_cb, obj);
}

void
object_remove(Object_t *obj)
{
   object_list_remove(obj->list, obj);
}

void 
object_lock(Object_t *obj)
{
   obj->locked = TRUE;
}

void 
object_unlock(Object_t *obj)
{
   obj->locked = FALSE;
}

void 
object_set_url(Object_t *obj, const gchar *url)
{
   g_strreplace(&obj->url, url);
}

void 
object_set_target(Object_t *obj, const gchar *target)
{
   g_strreplace(&obj->target, target);
}

void 
object_set_comment(Object_t *obj, const gchar *comment)
{
   g_strreplace(&obj->comment, comment);
}

void
object_set_mouse_over(Object_t *obj, const gchar *mouse_over)
{
   g_strreplace(&obj->mouse_over, mouse_over);
}

void
object_set_mouse_out(Object_t *obj, const gchar *mouse_out)
{
   g_strreplace(&obj->mouse_out, mouse_out);
}

void
object_set_focus(Object_t *obj, const gchar *focus)
{
   g_strreplace(&obj->focus, focus);
}

void
object_set_blur(Object_t *obj, const gchar *blur)
{
   g_strreplace(&obj->blur, blur);
}

gint
object_get_position_in_list(Object_t *obj)
{
   return g_list_index(obj->list->list, (gpointer) obj);
}

void 
object_emit_changed_signal(Object_t *obj)
{
   object_list_callback_call(&obj->list->changed_cb, obj);
}

GdkPixmap* 
object_get_icon(Object_t *obj, GtkWidget *widget, GdkBitmap **mask)
{
   if (!obj->class->icon) {
      GtkStyle  *style = gtk_widget_get_style(widget);
      obj->class->icon = 
	 gdk_pixmap_create_from_xpm_d(widget->window, &obj->class->mask,
				      &style->bg[GTK_STATE_NORMAL], 
				      obj->class->get_icon_data());
   }
   *mask = obj->class->mask;
   return obj->class->icon;
}

void
do_object_locked_dialog(void)
{
   static DefaultDialog_t *dialog;
   if (!dialog) {
      dialog = make_default_dialog("Object locked");
      default_dialog_hide_cancel_button(dialog);
      default_dialog_hide_apply_button(dialog);
      default_dialog_set_label(
	 dialog,
	 "\n  You cannot delete the selected object  \n"
	 "since it is currently being edited.\n");
   }
   default_dialog_show(dialog);
}

Object_t*
object_factory_create_object(ObjectFactory_t *factory, gint x, gint y)
{
   return factory->obj = factory->create_object(x, y);
}

static void
button_motion(GtkWidget *widget, GdkEventMotion *event, 
	      ObjectFactory_t *factory)
{
   gint x = get_real_coord((gint) event->x);
   gint y = get_real_coord((gint) event->y);

   round_to_grid(&x, &y);

   object_draw(factory->obj, widget->window);
   factory->set_xy(factory->obj, event->state, x, y);
   object_draw(factory->obj, widget->window);
}

void 
object_on_button_press(GtkWidget *widget, GdkEventButton *event, gpointer data)
{
   static ObjectFactory_t *factory;
   PreferencesData_t *preferences = get_preferences();
   gint x = get_real_coord((gint) event->x);
   gint y = get_real_coord((gint) event->y);
   static Object_t *obj;

   if (event->type == GDK_2BUTTON_PRESS)
      return;

   round_to_grid(&x, &y);

   if (obj) {
      if (event->button == 1) {
	 if (!factory->finish || factory->finish(obj, x, y)) {
	    gtk_signal_disconnect_by_func(GTK_OBJECT(widget), 
					  (GtkSignalFunc) button_motion, 
					  factory);

	    if (object_is_valid(obj)) {
	       Command_t *command = create_command_new(get_shapes(), obj);
	       command_execute(command);

	       if (preferences->prompt_for_area_info)
		  object_edit(obj, FALSE);
	    } else {
	       object_draw(obj, widget->window);
	       object_unref(obj);
	    }
	    gdk_gc_set_function(preferences->normal_gc, GDK_COPY);
	    obj = NULL;
	    main_clear_dimension();
	 }
      } else if (event->button == 3) {
	 object_draw(obj, widget->window);
	 if (!factory->cancel || factory->cancel(event, obj)) {
	    gtk_signal_disconnect_by_func(GTK_OBJECT(widget), 
					  (GtkSignalFunc) button_motion, 
					  factory);
	    object_unref(obj);
	    gdk_gc_set_function(preferences->normal_gc, GDK_COPY);
	    obj = NULL;
	    main_clear_dimension();
	 } else {
	    object_draw(obj, widget->window);
	 }
      }
   } else {
      if (event->button == 1) {
	 factory = ((ObjectFactory_t*(*)(guint)) data)(event->state);
	 obj = object_factory_create_object(factory, x, y);
	 
	 gdk_gc_set_function(preferences->normal_gc, GDK_EQUIV);
	 
	 gtk_signal_connect(GTK_OBJECT(widget), "motion_notify_event", 
			    (GtkSignalFunc) button_motion, factory);   
      }
   }
}

ObjectList_t*
make_object_list(void)
{
   ObjectList_t *list = g_new(ObjectList_t, 1);
   list->list = NULL;
   list->changed = FALSE;
   list->changed_cb.list = NULL;
   list->update_cb.list = NULL;
   list->add_cb.list = NULL;
   list->remove_cb.list = NULL;
   list->select_cb.list = NULL;
   list->move_cb.list = NULL;
   return list;
}

void
object_list_destruct(ObjectList_t *list)
{
   object_list_remove_all(list);
   g_free(list->list);
}

ObjectList_t*
object_list_append_list(ObjectList_t *des, ObjectList_t *src)
{
   GList *p;
   for (p = src->list; p; p = p->next)
      object_list_append(des, object_clone((Object_t*) p->data));
   object_list_set_changed(des, (src) ? TRUE : FALSE);
   return des;
}

ObjectList_t*
object_list_copy(ObjectList_t *des, ObjectList_t *src)
{
   if (des)
      object_list_remove_all(des);
   else
      des = make_object_list();

   return object_list_append_list(des, src);
}

void 
object_list_append(ObjectList_t *list, Object_t *object)
{
   object->list = list;
   list->list = g_list_append(list->list, (gpointer) object);
   object_list_set_changed(list, TRUE);
   object_list_callback_call(&list->add_cb, object);
}

void 
object_list_prepend(ObjectList_t *list, Object_t *object)
{
   object->list = list;
   list->list = g_list_prepend(list->list, (gpointer) object);
   object_list_set_changed(list, TRUE);
   object_list_callback_call(&list->add_cb, object);
}

void 
object_list_insert(ObjectList_t *list, gint position, Object_t *object)
{
   object->list = list;
   list->list = g_list_insert(list->list, (gpointer) object, position);
   object_list_set_changed(list, TRUE);
   object_list_callback_call(&list->add_cb, object);
}

void 
object_list_remove(ObjectList_t *list, Object_t *object)
{
   list->list = g_list_remove(list->list, (gpointer) object);
   object_list_set_changed(list, TRUE);
   object_list_callback_call(&list->remove_cb, object);
   object_unref(object);
}

void 
object_list_remove_link(ObjectList_t *list, GList *link)
{
   list->list = g_list_remove_link(list->list, link);
   object_list_set_changed(list, TRUE);
   object_list_callback_call(&list->remove_cb, (Object_t*) link->data);
}

void 
object_list_update(ObjectList_t *list, Object_t *object)
{
   object_list_callback_call(&list->update_cb, object);
}

void
object_list_draw(ObjectList_t *list, GdkWindow *window)
{
   GList *p;
   for (p = list->list; p; p = p->next)
      object_draw((Object_t*) p->data, window);
}

Object_t*
object_list_find(ObjectList_t *list, gint x, gint y)
{
   Object_t *found = NULL;
   GList *p;
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;
      if (obj->class->point_is_on(obj, x, y))
	 found = obj;
   }
   return found;
}

Object_t*
object_list_near_sash(ObjectList_t *list, gint x, gint y,
		      MoveSashFunc_t *sash_func)
{
   Object_t *found = NULL;
   GList *p;
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;
      if (obj->selected) {
	 MoveSashFunc_t func = obj->class->near_sash(obj, x, y);
	 if (func) {
	    found = obj;
	    *sash_func = func;
	 }
      }
   }
   return found;
}

void
object_list_remove_all(ObjectList_t *list)
{
   GList *p;
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;
      object_list_callback_call(&list->remove_cb, obj);
      object_unref(obj);
   }
   g_list_free(list->list);
   list->list = NULL;
   object_list_set_changed(list, TRUE);
}

void
clear_paste_buffer(void)
{
   if (_paste_buffer)
      object_list_remove_all(_paste_buffer);
   else
      _paste_buffer = make_object_list();
}

ObjectList_t*
get_paste_buffer(void)
{
   return _paste_buffer;
}

gint
object_list_cut(ObjectList_t *list)
{
   GList *p, *q;
   gint count = 0;

   clear_paste_buffer();
   for (p = list->list; p; p = q) {
      Object_t *obj = (Object_t*) p->data;
      q = p->next;
      if (obj->selected) {
	 if (obj->locked) {
	    do_object_locked_dialog();
	 } else {
	    object_list_append(_paste_buffer, obj);
	    object_list_remove_link(list, p);
	    count++;
	 }
      }
   }
   object_list_set_changed(list, (count) ? TRUE : FALSE);
   return count;
}

void 
object_list_copy_to_paste_buffer(ObjectList_t *list)
{
   GList *p;

   clear_paste_buffer();
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;
      if (obj->selected)
	 object_list_append(_paste_buffer, object_clone(obj));
   }
}

void 
object_list_paste(ObjectList_t *list)
{
   object_list_append_list(list, _paste_buffer);
}

void
object_list_delete_selected(ObjectList_t *list)
{
   GList *p, *q;
   for (p = list->list; p; p = q) {
      Object_t *obj = (Object_t*) p->data;
      q = p->next;
      if (obj->selected) {
	 if (obj->locked) {
	    do_object_locked_dialog();
	 } else {
	    object_list_remove_link(list, p);
	    object_unref(obj);
	 }
      }
   }
}

void 
object_list_edit_selected(ObjectList_t *list)
{
   GList *p;
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;
      if (obj->selected) {
	 object_edit(obj, TRUE);
	 break;
      }
   }
}

gint
object_list_select_all(ObjectList_t *list)
{
   GList *p;
   gint count = 0;
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;
      if (!obj->selected) {
	 object_select(obj);
	 count++;
      }
   }
   return count;
}

gint 
object_list_select_region(ObjectList_t *list, gint x, gint y, gint width,
			  gint height)
{
   GList *p;
   gint count = 0;
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;
      gint obj_x, obj_y, obj_width, obj_height;

      object_get_dimensions(obj, &obj_x, &obj_y, &obj_width, &obj_height);
      if (obj_x >= x && obj_x + obj_width <= x + width &&
	  obj_y >= y && obj_y + obj_height <= y + height) {
	 object_select(obj);
	 count++;
      }
   }
   return count;
}

gint
object_list_deselect_all(ObjectList_t *list, Object_t *exception)
{
   GList *p;
   gint count = 0;
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;
      if (obj->selected && obj != exception) {
	 object_unselect(obj);
	 count++;
      }
   }
   return count;
}

gint 
object_list_nr_selected(ObjectList_t *list)
{
   GList *p;
   gint count = 0;
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;
      if (obj->selected)
	 count++;
   }
   return count;
}

void 
object_list_resize(ObjectList_t *list, gint percentage_x, gint percentage_y)
{
   GList *p;
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;
      object_resize(obj, percentage_x, percentage_y);
   }
}

static void
object_list_swap_prev(ObjectList_t *list, GList *p)
{
   gpointer swap = p->data;
   p->data = p->prev->data;
   p->prev->data = swap;
   object_list_callback_call(&list->move_cb, (Object_t*) p->data);
   object_list_callback_call(&list->move_cb, (Object_t*) p->prev->data);
}

static void
object_list_swap_next(ObjectList_t *list, GList *p)
{
   gpointer swap = p->data;
   p->data = p->next->data;
   p->next->data = swap;
   object_list_callback_call(&list->move_cb, (Object_t*) p->data);
   object_list_callback_call(&list->move_cb, (Object_t*) p->next->data);
}

void 
object_list_move_up(ObjectList_t *list, Object_t *obj)
{
   GList *p = g_list_find(list->list, (gpointer) obj);
   object_list_swap_prev(list, p);
}

void 
object_list_move_down(ObjectList_t *list, Object_t *obj)
{
   GList *p = g_list_find(list->list, (gpointer) obj);
   object_list_swap_next(list, p);
}

void
object_list_move_selected_up(ObjectList_t *list)
{
   GList *p;

   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;
      if (obj->selected && p->prev)
	 object_list_swap_prev(list, p);
   }
}

void
object_list_move_selected_down(ObjectList_t *list)
{
   GList *p;

   for (p = g_list_last(list->list); p; p = p->prev) {
      Object_t *obj = (Object_t*) p->data;
      if (obj->selected && p->next)
	 object_list_swap_next(list, p);
   }
}

void 
object_list_move_to_front(ObjectList_t *list)
{
   GList *p, *q;
   guint length = g_list_length(list->list);

   for (p = list->list; length; p = q, length--) {
      Object_t *obj = (Object_t*) p->data;
      q = p->next;
      if (obj->selected) {
	 object_list_remove_link(list, p);
	 object_list_append(list, obj);
      }
   }
}

void 
object_list_send_to_back(ObjectList_t *list)
{
   GList *p, *q;
   guint length = g_list_length(list->list);

   for (p = list->list; length; p = q, length--) {
      Object_t *obj = (Object_t*) p->data;
      q = p->next;
      if (obj->selected) {
	 object_list_remove_link(list, p);
	 object_list_prepend(list, obj);
      }
   }
}

void
object_list_write_csim(ObjectList_t *list, gpointer param, OutputFunc_t output)
{
   GList *p;
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;

      output(param, "<AREA SHAPE=");
      obj->class->write_csim(obj, param, output);
      if (*obj->comment)
	 output(param, " ALT=\"%s\"", obj->comment);
      if (*obj->target)
	 output(param, " TARGET=\"%s\"", obj->target);
      if (*obj->mouse_over)
	 output(param, " onMouseover=\"%s\"", obj->mouse_over);
      if (*obj->mouse_out)
	 output(param, " onMouseout=\"%s\"", obj->mouse_out);
      if (*obj->focus)
	 output(param, " onFocus=\"%s\"", obj->focus);
      if (*obj->blur)
	 output(param, " onBlur=\"%s\"", obj->blur);

      output(param, " HREF=\"%s\">\n", obj->url);
   }
}

void
object_list_write_cern(ObjectList_t *list, gpointer param, OutputFunc_t output)
{
   GList *p;
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;
      obj->class->write_cern(obj, param, output);
      output(param, " %s\n", obj->url);
   }
}

void
object_list_write_ncsa(ObjectList_t *list, gpointer param, OutputFunc_t output)
{
   GList *p;
   for (p = list->list; p; p = p->next) {
      Object_t *obj = (Object_t*) p->data;

      if (*obj->comment)
	 output(param, "# %s\n", obj->comment);
      obj->class->write_ncsa(obj, param, output);
      output(param, "\n");
   }
}

