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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-splash.c
 *
 * Copyright (C) 2000  Helix Code, Inc.
 *
 * 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.
 *
 * Author: Ettore Perazzoli
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <gnome.h>
#include <gdk-pixbuf/gnome-canvas-pixbuf.h>
#include <gal/util/e-util.h>

#include "e-splash.h"


#define PARENT_TYPE gtk_window_get_type ()
static GtkWindowClass *parent_class = NULL;

struct _Icon {
    GdkPixbuf *dark_pixbuf;
    GdkPixbuf *light_pixbuf;
    GnomeCanvasItem *canvas_item;
};
typedef struct _Icon Icon;

struct _ESplashPrivate {
    GnomeCanvas *canvas;
    GdkPixbuf *splash_image_pixbuf;

    GList *icons;       /* (Icon *) */
    int num_icons;

    int layout_idle_id;
};


/* Layout constants.  These need to be changed if the splash changes.  */

#define ICON_Y    280
#define ICON_SIZE 32


/* Icon management.  */

static GdkPixbuf *
create_darkened_pixbuf (GdkPixbuf *pixbuf)
{
    GdkPixbuf *new;
    unsigned char *rowp;
    int width, height;
    int rowstride;
    int i, j;

    new = gdk_pixbuf_copy (pixbuf);
    if (! gdk_pixbuf_get_has_alpha (new))
        return new;

    width     = gdk_pixbuf_get_width (new);
    height    = gdk_pixbuf_get_height (new);
    rowstride = gdk_pixbuf_get_rowstride (new);

    rowp = gdk_pixbuf_get_pixels (new);
    for (i = 0; i < height; i ++) {
        unsigned char *p;

        p = rowp;
        for (j = 0; j < width; j++) {
            p[3] *= .25;
            p += 4;
        }

        rowp += rowstride;
    }

    return new;
}

static Icon *
icon_new (ESplash *splash,
      GdkPixbuf *image_pixbuf)
{
    ESplashPrivate *priv;
    GnomeCanvasGroup *canvas_root_group;
    Icon *icon;

    priv = splash->priv;

    icon = g_new (Icon, 1);

    icon->light_pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, ICON_SIZE, ICON_SIZE);
    gdk_pixbuf_scale (image_pixbuf, icon->light_pixbuf,
              0, 0,
              ICON_SIZE, ICON_SIZE,
              0, 0,
              (double) ICON_SIZE / gdk_pixbuf_get_width (image_pixbuf),
              (double) ICON_SIZE / gdk_pixbuf_get_height (image_pixbuf),
              GDK_INTERP_HYPER);

    icon->dark_pixbuf  = create_darkened_pixbuf (icon->light_pixbuf);

    /* Set up the canvas item to point to the dark pixbuf initially.  */

    canvas_root_group = GNOME_CANVAS_GROUP (GNOME_CANVAS (priv->canvas)->root);

    icon->canvas_item = gnome_canvas_item_new (canvas_root_group,
                           GNOME_TYPE_CANVAS_PIXBUF,
                           "pixbuf", icon->dark_pixbuf,
                           NULL);

    return icon;
}

static void
icon_free (Icon *icon)
{
    gdk_pixbuf_unref (icon->dark_pixbuf);
    gdk_pixbuf_unref (icon->light_pixbuf);
/*      gtk_object_unref (GTK_OBJECT (icon->canvas_item)); */

    g_free (icon);
}


/* Icon layout management.  */

static void
layout_icons (ESplash *splash)
{
    ESplashPrivate *priv;
    GList *p;
    double x_step;
    double x, y;

    priv = splash->priv;

    x_step = ((double) gdk_pixbuf_get_width (priv->splash_image_pixbuf)) / priv->num_icons;

    x = (x_step - ICON_SIZE) / 2.0;
    y = ICON_Y;

    for (p = priv->icons; p != NULL; p = p->next) {
        Icon *icon;

        icon = (Icon *) p->data;

        gtk_object_set (GTK_OBJECT (icon->canvas_item),
                "x", (double) x,
                "y", (double) ICON_Y,
                NULL);

        x += x_step;
    }
}

static int
layout_idle_cb (void *data)
{
    ESplash *splash;
    ESplashPrivate *priv;

    splash = E_SPLASH (data);
    priv = splash->priv;

    layout_icons (splash);

    priv->layout_idle_id = 0;

    return FALSE;
}

static void
schedule_relayout (ESplash *splash)
{
    ESplashPrivate *priv;

    priv = splash->priv;

    if (priv->layout_idle_id != 0)
        return;

    priv->layout_idle_id = gtk_idle_add (layout_idle_cb, splash);
}


/* GtkObject methods.  */

static void
impl_destroy (GtkObject *object)
{
    ESplash *splash;
    ESplashPrivate *priv;
    GList *p;

    splash = E_SPLASH (object);
    priv = splash->priv;

    if (priv->splash_image_pixbuf != NULL)
        gdk_pixbuf_unref (priv->splash_image_pixbuf);

    for (p = priv->icons; p != NULL; p = p->next) {
        Icon *icon;

        icon = (Icon *) p->data;
        icon_free (icon);
    }

    g_list_free (priv->icons);

    if (priv->layout_idle_id != 0)
        gtk_idle_remove (priv->layout_idle_id);

    g_free (priv);
}


static void
class_init (ESplashClass *klass)
{
    GtkObjectClass *object_class;

    object_class = GTK_OBJECT_CLASS (klass);
    object_class->destroy = impl_destroy;

    parent_class = gtk_type_class (gtk_window_get_type ());
}

static void
init (ESplash *splash)
{
    ESplashPrivate *priv;

    priv = g_new (ESplashPrivate, 1);
    priv->canvas              = NULL;
    priv->splash_image_pixbuf = NULL;
    priv->icons               = NULL;
    priv->num_icons           = 0;
    priv->layout_idle_id      = 0;

    splash->priv = priv;
}

static gboolean
button_press_event (GtkWidget *widget, GdkEventButton *event, gpointer data)
{
    ESplash *splash = (ESplash *) data;
    
    gtk_widget_hide (GTK_WIDGET (splash));
    
    return TRUE;
}


/**
 * e_splash_construct:
 * @splash: A pointer to an ESplash widget
 * @splash_image_pixbuf: The pixbuf for the image to appear in the splash dialog
 * 
 * Construct @splash with @splash_image_pixbuf as the splash image.
 **/
void
e_splash_construct (ESplash *splash,
            GdkPixbuf *splash_image_pixbuf)
{
    ESplashPrivate *priv;
    GtkWidget *canvas, *frame;
    int image_width, image_height;

    g_return_if_fail (splash != NULL);
    g_return_if_fail (E_IS_SPLASH (splash));
    g_return_if_fail (splash_image_pixbuf != NULL);

    priv = splash->priv;

    priv->splash_image_pixbuf = gdk_pixbuf_ref (splash_image_pixbuf);

    canvas = gnome_canvas_new_aa ();
    priv->canvas = GNOME_CANVAS (canvas);

    image_width = gdk_pixbuf_get_width (splash_image_pixbuf);
    image_height = gdk_pixbuf_get_height (splash_image_pixbuf);

    gtk_widget_set_usize (canvas, image_width, image_height);
    gnome_canvas_set_scroll_region (GNOME_CANVAS (canvas), 0, 0, image_width, image_height);
    gtk_widget_show (canvas);

    frame = gtk_frame_new (NULL);
    gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_OUT);
    gtk_container_add (GTK_CONTAINER (frame), canvas);
    gtk_widget_show (frame);

    gtk_container_add (GTK_CONTAINER (splash), frame);

    gnome_canvas_item_new (GNOME_CANVAS_GROUP (priv->canvas->root),
                   GNOME_TYPE_CANVAS_PIXBUF,
                   "pixbuf", splash_image_pixbuf,
                   NULL);
    
    gtk_signal_connect (GTK_OBJECT (splash), "button-press-event",
                GTK_SIGNAL_FUNC (button_press_event), splash);
    
    gtk_object_set (GTK_OBJECT (splash), "type", GTK_WINDOW_TOPLEVEL, NULL);
    gtk_window_set_position (GTK_WINDOW (splash), GTK_WIN_POS_CENTER);
    gtk_window_set_policy (GTK_WINDOW (splash), FALSE, FALSE, FALSE);
    gtk_window_set_default_size (GTK_WINDOW (splash), image_width, image_height);
}

/**
 * e_splash_new:
 *
 * Create a new ESplash widget.
 * 
 * Return value: A pointer to the newly created ESplash widget.
 **/
GtkWidget *
e_splash_new (void)
{
    ESplash *new;
    GdkPixbuf *splash_image_pixbuf;

    splash_image_pixbuf = gdk_pixbuf_new_from_file (EVOLUTION_IMAGES "/splash.png");
    g_return_val_if_fail (splash_image_pixbuf != NULL, NULL);

    new = gtk_type_new (e_splash_get_type ());
    e_splash_construct (new, splash_image_pixbuf);

    gdk_pixbuf_unref (splash_image_pixbuf);

    return GTK_WIDGET (new);
}


/**
 * e_splash_add_icon:
 * @splash: A pointer to an ESplash widget
 * @icon_pixbuf: Pixbuf for the icon to be added
 * 
 * Add @icon_pixbuf to the @splash.
 * 
 * Return value: The total number of icons in the splash after the new icon has
 * been added.
 **/
int
e_splash_add_icon (ESplash *splash,
           GdkPixbuf *icon_pixbuf)
{
    ESplashPrivate *priv;
    Icon *icon;

    g_return_val_if_fail (splash != NULL, 0);
    g_return_val_if_fail (E_IS_SPLASH (splash), 0);
    g_return_val_if_fail (icon_pixbuf != NULL, 0);

    priv = splash->priv;

    icon = icon_new (splash, icon_pixbuf);
    priv->icons = g_list_append (priv->icons, icon);

    priv->num_icons ++;

    schedule_relayout (splash);

    return priv->num_icons;
}

/**
 * e_splash_set_icon_highlight:
 * @splash: A pointer to an ESplash widget
 * @num: Number of the icon whose highlight state must be changed
 * @highlight: Whether the icon must be highlit or not
 * 
 * Change the highlight state of the @num-th icon.
 **/
void
e_splash_set_icon_highlight  (ESplash *splash,
                  int num,
                  gboolean highlight)
{
    ESplashPrivate *priv;
    Icon *icon;

    g_return_if_fail (splash != NULL);
    g_return_if_fail (E_IS_SPLASH (splash));

    priv = splash->priv;

    icon = (Icon *) g_list_nth (priv->icons, num)->data;

    gtk_object_set (GTK_OBJECT (icon->canvas_item),
            "pixbuf", highlight ? icon->light_pixbuf : icon->dark_pixbuf,
            NULL);
}


E_MAKE_TYPE (e_splash, "ESplash", ESplash, class_init, init, PARENT_TYPE)