/*
 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
 * Copyright (C) 2001-2004 Hiroyuki Yamamoto & The Sylpheed Claws Team
 *
 * 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.
 */

/* (alfons) - based on a contribution by Satoshi Nagayasu; revised for colorful 
 * menu and more Sylpheed integration. The idea to put the code in a separate
 * file is just that it make it easier to allow "user changeable" label colors.
 */

#include "defs.h"

#include <glib.h>
#include <glib/gi18n.h>
#include <gtk/gtkwidget.h>
#include <gtk/gtkpixmap.h>
#include <gtk/gtkmenu.h>
#include <gtk/gtkcheckmenuitem.h>
#include <gtk/gtklabel.h>
#include <gtk/gtkmenuitem.h>
#include <gtk/gtkalignment.h>
#include <gtk/gtkhbox.h>
#include <gtk/gtkvbox.h>
#include <gtk/gtkwindow.h>
#include <gtk/gtkdrawingarea.h>

#include "colorlabel.h"
#include "gtkutils.h"
#include "utils.h"

static gchar *labels[] = {
	N_("Orange"),
	N_("Red") ,
	N_("Pink"),
	N_("Sky blue"),
	N_("Blue"),
	N_("Green"),
	N_("Brown")
};

typedef enum LabelColorChangeFlags_ {
	LCCF_COLOR = 1 << 0,
	LCCF_LABEL = 1 << 1,
	LCCF_ALL   = LCCF_COLOR | LCCF_LABEL
} LabelColorChangeFlags;

/* XXX: if you add colors, make sure you also check the procmsg.h.
 * color indices are stored as 3 bits; that explains the max. of 7 colors */
static struct 
{
	LabelColorChangeFlags	changed; 
	GdkColor		color;

	/* XXX: note that the label member is supposed to be dynamically 
	 * allocated and fffreed */
	gchar			*label;
	GtkWidget		*widget;
} label_colors[] = {
	{ LCCF_ALL, { 0, 0xffff, (0x99 << 8), 0x0 },		NULL, NULL },
	{ LCCF_ALL, { 0, 0xffff, 0, 0 },			NULL, NULL },
	{ LCCF_ALL, { 0, 0xffff, (0x66 << 8), 0xffff },		NULL, NULL },
	{ LCCF_ALL, { 0, 0x0, (0xcc << 8), 0xffff },		NULL, NULL },
	{ LCCF_ALL, { 0, 0x0, 0x0, 0xffff },			NULL, NULL },
	{ LCCF_ALL, { 0, 0x0, 0x99 << 8, 0x0 },			NULL, NULL },
	{ LCCF_ALL, { 0, 0x66 << 8, 0x33 << 8, 0x33 << 8 },	NULL, NULL }
};

#define LABEL_COLOR_WIDTH	28
#define LABEL_COLOR_HEIGHT	16

#define LABEL_COLORS_ELEMS (sizeof label_colors / sizeof label_colors[0])

#define G_RETURN_VAL_IF_INVALID_COLOR(color, val) \
	g_return_val_if_fail((color) >= 0 && (color) < LABEL_COLORS_ELEMS, (val))

static void colorlabel_recreate        (gint);
static void colorlabel_recreate_label  (gint);

gint colorlabel_get_color_count(void)
{
	return LABEL_COLORS_ELEMS;
}

GdkColor colorlabel_get_color(gint color_index)
{
	GdkColor invalid = { 0 };

	G_RETURN_VAL_IF_INVALID_COLOR(color_index, invalid);

	return label_colors[color_index].color;
}

gchar *colorlabel_get_color_text(gint color_index)
{
	G_RETURN_VAL_IF_INVALID_COLOR(color_index, NULL);

	colorlabel_recreate_label(color_index);
	return label_colors[color_index].label;
}

static gboolean colorlabel_drawing_area_expose_event_cb
	(GtkWidget *widget, GdkEventExpose *expose, gpointer data)
{
	GdkDrawable *drawable = widget->window;
	gulong c = (gulong) GPOINTER_TO_INT(data);
	GdkColor color;
	GdkGC *gc;

	color.red   = ((c >> 16UL) & 0xFFUL) << 8UL;
	color.green = ((c >>  8UL) & 0xFFUL) << 8UL;
	color.blue  = ((c)         & 0xFFUL) << 8UL;

	gdk_colormap_alloc_color(gtk_widget_get_colormap(widget), &color, FALSE, TRUE);

	gc = gdk_gc_new(drawable);

	gdk_gc_set_foreground(gc, &color);
	gdk_draw_rectangle(drawable, gc,
			   TRUE, 0, 0, widget->allocation.width - 1,
			   widget->allocation.height - 1);
	gdk_draw_rectangle(drawable, widget->style->black_gc,
			   FALSE, 0, 0, widget->allocation.width - 1,
			   widget->allocation.height - 1);

	gdk_gc_unref(gc);			   

	return FALSE;
}

static GtkWidget *colorlabel_create_color_widget(GdkColor color)
{
	GtkWidget *widget;

	widget = gtk_drawing_area_new();
	gtk_drawing_area_size(GTK_DRAWING_AREA(widget),
			      LABEL_COLOR_WIDTH - 2, LABEL_COLOR_HEIGHT - 4);

#define CL(x)		(((gulong) (x) >> (gulong) 8) & 0xFFUL)	
#define CR(r, g, b)	((CL(r) << (gulong) 16) | \
			 (CL(g) << (gulong)  8) | \
			 (CL(b)))

	g_signal_connect(G_OBJECT(widget), "expose_event", 
			 G_CALLBACK(colorlabel_drawing_area_expose_event_cb),
			 GINT_TO_POINTER
				((gint)CR(color.red, color.green, color.blue)));

	return widget;
}

/* XXX: this function to check if menus with colors and labels should
 * be recreated */
gboolean colorlabel_changed(void)
{
	gint n;

	for (n = 0; n < LABEL_COLORS_ELEMS; n++) {
		if (label_colors[n].changed) 
			return TRUE;
	}

	return FALSE;
}

/* XXX: colorlabel_recreate_XXX are there to make sure everything
 * is initialized ok, without having to call a global _xxx_init_
 * function */
static void colorlabel_recreate_color(gint color)
{
	GtkWidget *widget;

	if (!(label_colors[color].changed & LCCF_COLOR))
		return;

	widget = colorlabel_create_color_widget(label_colors[color].color);
	g_return_if_fail(widget);

	if (label_colors[color].widget) 
		gtk_widget_destroy(label_colors[color].widget);

	label_colors[color].widget = widget;		
	label_colors[color].changed &= ~LCCF_COLOR;
}

static void colorlabel_recreate_label(gint color)
{
	if (!label_colors[color].changed & LCCF_LABEL)
		return;

	if (label_colors[color].label == NULL) 
		label_colors[color].label = g_strdup(gettext(labels[color]));

	label_colors[color].changed &= ~LCCF_LABEL;
}

/* XXX: call this function everytime when you're doing important
 * stuff with the label_colors[] array */
static void colorlabel_recreate(gint color)
{
	colorlabel_recreate_label(color);
	colorlabel_recreate_color(color);
}

static void colorlabel_recreate_all(void)
{
	gint n;

	for ( n = 0; n < LABEL_COLORS_ELEMS; n++) 
		colorlabel_recreate(n);
}

/* colorlabel_create_check_color_menu_item() - creates a color
 * menu item with a check box */
GtkWidget *colorlabel_create_check_color_menu_item(gint color_index)
{
	GtkWidget *label; 
	GtkWidget *hbox; 
	GtkWidget *vbox; 
	GtkWidget *item;

	G_RETURN_VAL_IF_INVALID_COLOR(color_index, NULL);

	item = gtk_check_menu_item_new();

	colorlabel_recreate(color_index);

	/* XXX: gnome-core::panel::menu.c is a great example of
	 * how to create pixmap menus */
	label = gtk_label_new(label_colors[color_index].label);

	gtk_widget_show(label);
	hbox = gtk_hbox_new(FALSE, 0);
	gtk_widget_show(hbox);
	gtk_container_add(GTK_CONTAINER(item), hbox);

	vbox = gtk_vbox_new(TRUE, 0);
	gtk_widget_show(vbox);
	gtk_container_set_border_width(GTK_CONTAINER(vbox), 1);

	gtk_container_add(GTK_CONTAINER(vbox),
			  label_colors[color_index].widget);
	gtk_widget_show(label_colors[color_index].widget);

	gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0);
	gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 4);

	return item;
}

/* colorlabel_create_color_menu() - creates a color menu without 
 * checkitems, probably for use in combo items */
GtkWidget *colorlabel_create_color_menu(void)
{
	GtkWidget *label; 
	GtkWidget *item;
	GtkWidget *menu;
	gint i;

	colorlabel_recreate_all();

	/* create the menu items. each item has its color code attached */
	menu = gtk_menu_new();
	g_object_set_data(G_OBJECT(menu), "label_color_menu", menu);

#if 0
	item = gtk_menu_item_new_with_label(_("None"));
	gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
	g_object_set_data(G_OBJECT(item), "color", GUINT_TO_POINTER(0));
	gtk_widget_show(item);
#endif

	/* and the color items */
	for (i = 0; i < LABEL_COLORS_ELEMS; i++) {
		GtkWidget *hbox; 
		GtkWidget *vbox;
		GtkWidget *widget;

		item  = gtk_menu_item_new();
		g_object_set_data(G_OBJECT(item), "color",
				  GUINT_TO_POINTER(i + 1));

		label = gtk_label_new(label_colors[i].label);
		
		gtk_widget_show(label);
		hbox = gtk_hbox_new(FALSE, 0);
		gtk_widget_show(hbox);
		gtk_container_add(GTK_CONTAINER(item), hbox);

		vbox = gtk_vbox_new(TRUE, 0);
		gtk_widget_show(vbox);
		gtk_container_set_border_width(GTK_CONTAINER(vbox), 1);

		widget = colorlabel_create_color_widget(label_colors[i].color);
		gtk_widget_show(widget);
		gtk_box_pack_start(GTK_BOX(vbox), widget, FALSE, FALSE, 0);

		gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0);
		gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 4);
		
		gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
		gtk_widget_show(item);
	}

	gtk_widget_show(menu);

	return menu;
}

guint colorlabel_get_color_menu_active_item(GtkWidget *menu)
{
	GtkWidget *menuitem;
	guint color;

	g_return_val_if_fail
		(g_object_get_data(G_OBJECT(menu), "label_color_menu"), 0);
	menuitem = gtk_menu_get_active(GTK_MENU(menu));
	color = GPOINTER_TO_UINT
		(g_object_get_data(G_OBJECT(menuitem), "color"));
	return color;
}
