/*
 Copyright (C) 2009 Christian Dywan <christian@twotoasts.de>

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 See the file COPYING for the full license text.
*/

#include <midori/midori.h>

static void
colorful_tabs_button_toggled_cb (GtkWidget*       button,
                                 MidoriExtension* extension)
{
    midori_extension_set_boolean (extension, "tint",
        !midori_extension_get_boolean (extension, "tint"));
    /* FIXME: Update all tab colors */
}

static void
colorful_tabs_view_notify_uri_cb (MidoriView*      view,
                                  GParamSpec*      pspec,
                                  MidoriExtension* extension)
{
    GtkWidget* label;
    SoupURI* uri;
    gchar* hash;
    gchar* colorstr;
    GdkColor color;

    label = midori_view_get_proxy_tab_label (view);
    if (!midori_extension_get_boolean (extension, "tint"))
    {
        gtk_widget_modify_bg (label, GTK_STATE_NORMAL, NULL);
        gtk_widget_modify_bg (label, GTK_STATE_ACTIVE, NULL);
        return;
    }

    /* Find a color that is unique to an address. We merely compute
       a hash value, pick the first 6 + 1 characters and turn the
       first into a hash sign, ie. #8b424b. In case a color is too
       dark, we lighten it up a litte. Finally we make the event box
       visible and modify its background. */

    uri = soup_uri_new (midori_view_get_display_uri (view));
    hash = g_compute_checksum_for_string (G_CHECKSUM_MD5, uri->host, -1);
    soup_uri_free (uri);
    colorstr = g_strndup (hash, 6 + 1);
    g_free (hash);
    colorstr[0] = '#';
    gdk_color_parse (colorstr, &color);
    if (color.red < 35000)
        color.red += 25000 + (color.blue + 1) / 2;
    if (color.green < 35000)
        color.green += 25000 + (color.red + 1) / 2;
    if (color.blue < 35000)
        color.blue += 25000 + (color.green + 1) / 2;
    gtk_event_box_set_visible_window (GTK_EVENT_BOX (label), TRUE);
    gtk_widget_modify_bg (label, GTK_STATE_NORMAL, &color);
    gtk_widget_modify_bg (label, GTK_STATE_ACTIVE, &color);
}

static void
colorful_tabs_browser_add_tab_cb (MidoriBrowser*   browser,
                                  MidoriView*      view,
                                  MidoriExtension* extension)
{
    g_signal_connect (view, "notify::uri",
        G_CALLBACK (colorful_tabs_view_notify_uri_cb), extension);
}

static void
colorful_tabs_deactivate_cb (MidoriExtension* extension,
                             GtkWidget*       bbox)
{
    gtk_widget_destroy (bbox);
    g_signal_handlers_disconnect_by_func (
        extension, colorful_tabs_deactivate_cb, bbox);
    /* FIXME: Disconnect signals */
    /* FIXME: Reset all tab colors */
}

static void
colorful_tabs_app_add_browser_cb (MidoriApp*       app,
                                  MidoriBrowser*   browser,
                                  MidoriExtension* extension)
{
    GtkWidget* statusbar;
    GtkWidget* bbox;
    GtkWidget* button;

    statusbar = katze_object_get_object (browser, "statusbar");
    bbox = gtk_hbox_new (FALSE, 0);
    button = gtk_check_button_new_with_label (_("Tint tabs distinctly"));
    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button),
        midori_extension_get_boolean (extension, "tint"));
    gtk_box_pack_start (GTK_BOX (bbox), button, FALSE, FALSE, 2);
    gtk_widget_show (button);
    gtk_widget_show (bbox);
    gtk_box_pack_start (GTK_BOX (statusbar), bbox, FALSE, FALSE, 3);

    g_signal_connect (button, "toggled",
        G_CALLBACK (colorful_tabs_button_toggled_cb), extension);
    g_signal_connect (browser, "add-tab",
        G_CALLBACK (colorful_tabs_browser_add_tab_cb), extension);
    g_signal_connect (extension, "deactivate",
        G_CALLBACK (colorful_tabs_deactivate_cb), bbox);
}

static void
colorful_tabs_activate_cb (MidoriExtension* extension,
                           MidoriApp*       app)
{
    KatzeArray* browsers;
    MidoriBrowser* browser;
    guint i;

    browsers = katze_object_get_object (app, "browsers");
    i = 0;
    while ((browser = katze_array_get_nth_item (browsers, i++)))
        colorful_tabs_app_add_browser_cb (app, browser, extension);
    g_signal_connect (app, "add-browser",
        G_CALLBACK (colorful_tabs_app_add_browser_cb), extension);
}

MidoriExtension*
extension_init (void)
{
    MidoriExtension* extension = g_object_new (MIDORI_TYPE_EXTENSION,
        "name", _("Colorful Tabs"),
        "description", _("Tint each tab distinctly"),
        "version", "0.1",
        "authors", "Christian Dywan <christian@twotoasts.de>",
        NULL);
    midori_extension_install_boolean (extension, "tint", FALSE);

    g_signal_connect (extension, "activate",
        G_CALLBACK (colorful_tabs_activate_cb), NULL);

    return extension;
}