/*
 *  Copyright (C) 2005 Robert Staudinger
 *
 *  This software is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Library General Public License as published by
 *  the Free Software Foundation; either version 2, 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 Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library 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 <string.h>
#include "ut_assert.h"
#include "ev_UnixFontCombo.h"

#define PREVIEW_TEXT "AaBb"

/* builtin GtkCellRendererText subclass */

#define ABI_TYPE_CELL_RENDERER_FONT                  (abi_cell_renderer_font_get_type ())
#define ABI_CELL_RENDERER_FONT(obj)                  (G_TYPE_CHECK_INSTANCE_CAST ((obj), ABI_TYPE_CELL_RENDERER_FONT, AbiCellRendererFont))
#define ABI_CELL_RENDERER_FONT_CLASS(klass)          (G_TYPE_CHECK_CLASS_CAST ((klass), ABI_TYPE_CELL_RENDERER_FONT, AbiCellRendererFontClass))
#define ABI_IS_CELL_RENDERER_FONT(obj)               (G_TYPE_CHECK_INSTANCE_TYPE ((obj), ABI_TYPE_CELL_RENDERER_FONT))
#define ABI_IS_CELL_RENDERER_FONT_CLASS(klass)       (G_TYPE_CHECK_CLASS_TYPE ((klass), ABI_TYPE_CELL_RENDERER_FONT))
#define ABI_CELL_RENDERER_FONT_GET_CLASS(obj)        (G_TYPE_INSTANCE_GET_CLASS ((obj), ABI_TYPE_CELL_RENDERER_FONT, AbiCellRendererFontClass))

typedef struct _AbiCellRendererFont 		AbiCellRendererFont;
typedef struct _AbiCellRendererFontClass 	AbiCellRendererFontClass;

struct _AbiCellRendererFont {
	GtkCellRendererText 	 parent;
	GtkWidget		*parent_widget;
	gboolean		 is_popped_up;
};

struct _AbiCellRendererFontClass {
	GtkCellRendererTextClass parent;

	void (* popup_position) (GtkCellRenderer *cell, 
				 GdkRectangle	 *position);
	void (* prelight_popup) (GtkCellRenderer *cell, 
				 const gchar 	 *text);
	void (* render_closed)  (GtkCellRenderer *cell);
};

GType abi_cell_renderer_font_get_type (void);

/* TreeModel columns */
enum {
	FONT, 
	NUM_COLS
};

/* Signal IDs */
enum {
	RENDERER_POPUP_OPENED,
	RENDERER_PRELIGHT,
	RENDERER_POPUP_CLOSED,
	RENDERER_LAST_SIGNAL
};

static guint cell_renderer_font_signals[RENDERER_LAST_SIGNAL] = { 0 };

static GtkCellRendererTextClass *abi_cell_renderer_font_parent_class = NULL;

void
abi_cell_renderer_font_render (GtkCellRenderer      *cell,
			       GdkDrawable          *window,
			       GtkWidget            *widget,
			       GdkRectangle         *background_area,
			       GdkRectangle         *cell_area,
			       GdkRectangle         *expose_area,
			       GtkCellRendererState  flags)
{
	AbiCellRendererFont	*self;
	GtkTreeModel		*model;
	GtkTreeIter		 iter;
	gchar 			*text;

	self = ABI_CELL_RENDERER_FONT (cell);
	text = NULL;

	GTK_CELL_RENDERER_CLASS (abi_cell_renderer_font_parent_class)->render (
					cell, window, widget, background_area, 
					cell_area, expose_area, flags);

	if ((GTK_CELL_RENDERER_PRELIT | GTK_CELL_RENDERER_PRELIT) & flags) {

		/* only fire prelight event if popup is open */
		if (!gtk_widget_is_ancestor (widget, self->parent_widget)) {

			if (!self->is_popped_up) {
				gint x, y;

				/* open_popup (self->parent_widget); */
				self->is_popped_up = TRUE;

				gdk_window_get_origin(widget->window, &x, &y);
				background_area->x += x + widget->allocation.width;
				background_area->y += y;
				g_signal_emit (G_OBJECT (cell), 
					       cell_renderer_font_signals[RENDERER_POPUP_OPENED],
					       0, background_area);
			}

			g_object_get (G_OBJECT (cell), 
					      "text", &text, 
					      NULL);

			UT_return_if_fail (text);
			if (0 == strcmp (text, PREVIEW_TEXT)) {
				g_free (text);
				text = NULL;
				gtk_combo_box_get_active_iter (GTK_COMBO_BOX (self->parent_widget), &iter);
				model = gtk_combo_box_get_model (GTK_COMBO_BOX (self->parent_widget));
				UT_return_if_fail (model);
				gtk_tree_model_get (model, &iter, 
						    FONT, &text, 
						    -1);
			}
			g_signal_emit (G_OBJECT (cell), 
				       cell_renderer_font_signals[RENDERER_PRELIGHT],
				       0, text);
		}
	}
	else if (gtk_widget_is_ancestor (widget, self->parent_widget)) {
		g_signal_emit (G_OBJECT (cell), 
			       cell_renderer_font_signals[RENDERER_POPUP_CLOSED],
			       0);
		self->is_popped_up = FALSE;
	}

	if (text) {
		g_free (text);
	}
}

static void
abi_cell_renderer_font_instance_init (AbiCellRendererFont *self)
{
	self->is_popped_up = FALSE;
}

static void
abi_cell_renderer_font_instance_destroy (GtkObject *instance)
{
	GTK_OBJECT_CLASS (abi_cell_renderer_font_parent_class)->destroy (instance);
}

static void
abi_cell_renderer_font_class_init (AbiCellRendererFontClass *klass)
{
	GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (klass);
	GtkCellRendererClass *cell_renderer_class = GTK_CELL_RENDERER_CLASS (klass);

	abi_cell_renderer_font_parent_class = (GtkCellRendererTextClass*) g_type_class_ref (GTK_TYPE_CELL_RENDERER_TEXT);

	gtk_object_class->destroy = abi_cell_renderer_font_instance_destroy;

	cell_renderer_class->render = abi_cell_renderer_font_render;

	cell_renderer_font_signals[RENDERER_POPUP_OPENED] =
		g_signal_new ("renderer-popup-opened",
			G_OBJECT_CLASS_TYPE (klass),
			G_SIGNAL_RUN_LAST,
			G_STRUCT_OFFSET (AbiCellRendererFontClass, popup_position),
			NULL, NULL,
			g_cclosure_marshal_VOID__POINTER,
			G_TYPE_NONE, 1,
			G_TYPE_POINTER);

	cell_renderer_font_signals[RENDERER_PRELIGHT] =
		g_signal_new ("renderer-prelight",
			G_OBJECT_CLASS_TYPE (klass),
			G_SIGNAL_RUN_LAST,
			G_STRUCT_OFFSET (AbiCellRendererFontClass, prelight_popup),
			NULL, NULL,
			g_cclosure_marshal_VOID__POINTER,
			G_TYPE_NONE, 1,
			G_TYPE_POINTER);

	cell_renderer_font_signals[RENDERER_POPUP_CLOSED] =
		g_signal_new ("renderer-popup-closed",
			G_OBJECT_CLASS_TYPE (klass),
			G_SIGNAL_RUN_LAST,
			G_STRUCT_OFFSET (AbiCellRendererFontClass, render_closed),
			NULL, NULL,
			g_cclosure_marshal_VOID__VOID,
			G_TYPE_NONE, 0);
}

GType
abi_cell_renderer_font_get_type (void)
{
        static GType type = 0;
        if (!type) {
                static const GTypeInfo info = {
                        sizeof (AbiCellRendererFontClass),
                        NULL,           /* base_init */
                        NULL,           /* base_finalize */
                        (GClassInitFunc) abi_cell_renderer_font_class_init,
                        NULL,           /* class_finalize */
                        NULL,           /* class_data */
                        sizeof (AbiCellRendererFont),
                        0,              /* n_preallocs */
                        (GInstanceInitFunc) abi_cell_renderer_font_instance_init,
						NULL
                };
                type = g_type_register_static (GTK_TYPE_CELL_RENDERER_TEXT, 
					       "AbiCellRendererFont", &info, 
					       (GTypeFlags)0);
        }
        return type;
}

GtkCellRenderer *
abi_cell_renderer_font_new (GtkWidget *parent)
{
	GtkCellRenderer *self;
	self = (GtkCellRenderer *) g_object_new (ABI_TYPE_CELL_RENDERER_FONT, 
						 NULL);
	ABI_CELL_RENDERER_FONT (self)->parent_widget = parent;
	return self;
}



/* GtkComboBox subclass */

/* Signal IDs */
enum {
	POPUP_OPENED,
	PRELIGHT,
	POPUP_CLOSED,
	LAST_SIGNAL
};

static guint font_combo_signals[LAST_SIGNAL] = { 0 };

static GtkComboBoxClass *abi_font_combo_parent_class = NULL;

static void
renderer_popup_opened_cb (AbiFontCombo		*self, 
		   GdkRectangle		*position, 
		   GtkCellRenderer 	* /*renderer*/)
{
	g_signal_emit (G_OBJECT (self), font_combo_signals[POPUP_OPENED],
		       0, position);
}

static void
renderer_prelight_cb (AbiFontCombo		*self, 
		   const gchar		*text, 
		   GtkCellRenderer 	* /*renderer*/)
{
	g_signal_emit (G_OBJECT (self), font_combo_signals[PRELIGHT],
		       0, text);
}

static void
renderer_popup_closed_cb (AbiFontCombo		*self, 
		  GtkCellRenderer 	* /*renderer*/)
{
	g_signal_emit (G_OBJECT (self), font_combo_signals[POPUP_CLOSED],
		       0);
}

static void
abi_font_combo_init (AbiFontCombo *self)
{
	self->is_disposed = FALSE;
}

static void
abi_font_combo_dispose (GObject *instance)
{
	AbiFontCombo *self;

	self = ABI_FONT_COMBO (instance);

	if (self->is_disposed) {
		return;
	}

	self->is_disposed = TRUE;

	g_object_unref (G_OBJECT (self->sort));
	self->sort = NULL;

	g_object_unref (G_OBJECT (self->model));
	self->model = NULL;

	G_OBJECT_CLASS (abi_font_combo_parent_class)->dispose (instance);
}

static void
abi_font_combo_finalize (GObject *instance)
{
	G_OBJECT_CLASS (abi_font_combo_parent_class)->finalize (instance);
}

static void
abi_font_combo_class_init (AbiFontComboClass *klass)
{
	GObjectClass *g_object_class = G_OBJECT_CLASS (klass);

	abi_font_combo_parent_class = (GtkComboBoxClass*) g_type_class_ref (GTK_TYPE_COMBO_BOX);

	g_object_class = (GObjectClass *) klass;
	g_object_class->dispose = abi_font_combo_dispose;
	g_object_class->finalize = abi_font_combo_finalize;

	font_combo_signals[POPUP_OPENED] =
		g_signal_new ("popup-opened",
			G_OBJECT_CLASS_TYPE (klass),
			G_SIGNAL_RUN_LAST,
			G_STRUCT_OFFSET (AbiFontComboClass, popup_opened),
			NULL, NULL,
			g_cclosure_marshal_VOID__POINTER,
			G_TYPE_NONE, 1,
			G_TYPE_POINTER);

	font_combo_signals[PRELIGHT] =
		g_signal_new ("prelight",
			G_OBJECT_CLASS_TYPE (klass),
			G_SIGNAL_RUN_LAST,
			G_STRUCT_OFFSET (AbiFontComboClass, prelight),
			NULL, NULL,
			g_cclosure_marshal_VOID__POINTER,
			G_TYPE_NONE, 1,
			G_TYPE_POINTER);

	font_combo_signals[POPUP_CLOSED] =
		g_signal_new ("popup-closed",
			G_OBJECT_CLASS_TYPE (klass),
			G_SIGNAL_RUN_LAST,
			G_STRUCT_OFFSET (AbiFontComboClass, popup_closed),
			NULL, NULL,
			g_cclosure_marshal_VOID__VOID,
			G_TYPE_NONE, 0);
}

GType
abi_font_combo_get_type (void)
{
        static GType type = 0;
        if (!type) {
                static const GTypeInfo info = {
                        sizeof (AbiFontComboClass),
                        NULL,           /* base_init */
                        NULL,           /* base_finalize */
                        (GClassInitFunc) abi_font_combo_class_init,
                        NULL,           /* class_finalize */
                        NULL,           /* class_data */
                        sizeof (AbiFontCombo),
                        0,              /* n_preallocs */
                        (GInstanceInitFunc) abi_font_combo_init,
						NULL
                };
                type = g_type_register_static (GTK_TYPE_COMBO_BOX, 
					       "AbiFontCombo", &info, 
					       (GTypeFlags)0);
        }
        return type;
}

GtkWidget *
abi_font_combo_new (void)
{
	AbiFontCombo 	 *self;
	GtkCellRenderer  *cell;

	self = (AbiFontCombo *) g_object_new (ABI_TYPE_FONT_COMBO, NULL);
	self->model = (GtkTreeModel *) gtk_list_store_new (NUM_COLS, G_TYPE_STRING);
	self->sort = gtk_tree_model_sort_new_with_model (self->model);
	gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (self->sort), FONT, GTK_SORT_ASCENDING);
	gtk_combo_box_set_model (GTK_COMBO_BOX (self), self->sort);

	cell = abi_cell_renderer_font_new (GTK_WIDGET (self));
	gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (self), cell, FALSE);
	gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (self), cell,
					"text", FONT,
					NULL);

	g_signal_connect_swapped (G_OBJECT (cell), "renderer-popup-opened", 
				  G_CALLBACK (renderer_popup_opened_cb), (gpointer) self);
	g_signal_connect_swapped (G_OBJECT (cell), "renderer-prelight", 
				  G_CALLBACK (renderer_prelight_cb), (gpointer) self);
	g_signal_connect_swapped (G_OBJECT (cell), "renderer-popup-closed", 
				  G_CALLBACK (renderer_popup_closed_cb), (gpointer) self);

	return GTK_WIDGET (self);
}

void
abi_font_combo_insert_font (AbiFontCombo 	*self, 
			    const gchar		*font, 
			    gboolean 		 select)
{
	GtkTreeIter	 iter;

	gtk_list_store_append (GTK_LIST_STORE (self->model), &iter);
	gtk_list_store_set (GTK_LIST_STORE (self->model), &iter, 
			    FONT, font, 
			    -1);

	if (select) {
		GtkTreeIter sorted_iter;
		gtk_tree_model_sort_convert_child_iter_to_iter (
			GTK_TREE_MODEL_SORT (self->sort), &sorted_iter, &iter);
		gtk_combo_box_set_active_iter (GTK_COMBO_BOX (self), &sorted_iter);
	}
}

/*!
 * Use this for updating the whole combo.
 * \param self
 * \param fonts NULL-terminated array of fonts.
 */
void
abi_font_combo_set_fonts (AbiFontCombo 	 *self, 
			  const gchar 	**fonts)
{
	GtkTreeIter	  iter;
	const gchar	**font_iter;

	g_return_if_fail (fonts);

	gtk_combo_box_set_model (GTK_COMBO_BOX (self), NULL);
	g_object_unref (G_OBJECT (self->sort)); self->sort = NULL;
	gtk_list_store_clear (GTK_LIST_STORE (self->model));

	font_iter = fonts;
	while (font_iter && *font_iter) {
		gtk_list_store_append (GTK_LIST_STORE (self->model), &iter);
		gtk_list_store_set (GTK_LIST_STORE (self->model), &iter, 
				    FONT, *font_iter, 
				    -1);
		font_iter++;
	}

	self->sort = gtk_tree_model_sort_new_with_model (self->model);
	gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (self->sort), FONT, GTK_SORT_ASCENDING);
	gtk_combo_box_set_model (GTK_COMBO_BOX (self), self->sort);
}