/*
 * e-shell-sidebar.c
 *
 * This program 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 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

/**
 * SECTION: e-shell-sidebar
 * @short_description: the left side of the main window
 * @include: shell/e-shell-sidebar.h
 **/

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

#include "e-shell-sidebar.h"

#include <libebackend/libebackend.h>

#include <libevolution-utils/e-alert-sink.h>
#include <e-util/e-unicode.h>
#include <shell/e-shell-view.h>

#define E_SHELL_SIDEBAR_GET_PRIVATE(obj) \
	(G_TYPE_INSTANCE_GET_PRIVATE \
	((obj), E_TYPE_SHELL_SIDEBAR, EShellSidebarPrivate))

struct _EShellSidebarPrivate {

	gpointer shell_view;  /* weak pointer */

	GtkWidget *event_box;

	gchar *icon_name;
	gchar *primary_text;
	gchar *secondary_text;
};

enum {
	PROP_0,
	PROP_ICON_NAME,
	PROP_PRIMARY_TEXT,
	PROP_SECONDARY_TEXT,
	PROP_SHELL_VIEW
};

/* Forward Declarations */
static void	e_shell_sidebar_alert_sink_init
					(EAlertSinkInterface *interface);

G_DEFINE_TYPE_WITH_CODE (
	EShellSidebar,
	e_shell_sidebar,
	GTK_TYPE_BIN,
	G_IMPLEMENT_INTERFACE (
		E_TYPE_ALERT_SINK, e_shell_sidebar_alert_sink_init)
	G_IMPLEMENT_INTERFACE (
		E_TYPE_EXTENSIBLE, NULL))

static void
shell_sidebar_set_shell_view (EShellSidebar *shell_sidebar,
                              EShellView *shell_view)
{
	g_return_if_fail (shell_sidebar->priv->shell_view == NULL);

	shell_sidebar->priv->shell_view = shell_view;

	g_object_add_weak_pointer (
		G_OBJECT (shell_view),
		&shell_sidebar->priv->shell_view);
}

static void
shell_sidebar_set_property (GObject *object,
                            guint property_id,
                            const GValue *value,
                            GParamSpec *pspec)
{
	switch (property_id) {
		case PROP_ICON_NAME:
			e_shell_sidebar_set_icon_name (
				E_SHELL_SIDEBAR (object),
				g_value_get_string (value));
			return;

		case PROP_PRIMARY_TEXT:
			e_shell_sidebar_set_primary_text (
				E_SHELL_SIDEBAR (object),
				g_value_get_string (value));
			return;

		case PROP_SECONDARY_TEXT:
			e_shell_sidebar_set_secondary_text (
				E_SHELL_SIDEBAR (object),
				g_value_get_string (value));
			return;

		case PROP_SHELL_VIEW:
			shell_sidebar_set_shell_view (
				E_SHELL_SIDEBAR (object),
				g_value_get_object (value));
			return;
	}

	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
shell_sidebar_get_property (GObject *object,
                            guint property_id,
                            GValue *value,
                            GParamSpec *pspec)
{
	switch (property_id) {
		case PROP_ICON_NAME:
			g_value_set_string (
				value, e_shell_sidebar_get_icon_name (
				E_SHELL_SIDEBAR (object)));
			return;

		case PROP_PRIMARY_TEXT:
			g_value_set_string (
				value, e_shell_sidebar_get_primary_text (
				E_SHELL_SIDEBAR (object)));
			return;

		case PROP_SECONDARY_TEXT:
			g_value_set_string (
				value, e_shell_sidebar_get_secondary_text (
				E_SHELL_SIDEBAR (object)));
			return;

		case PROP_SHELL_VIEW:
			g_value_set_object (
				value, e_shell_sidebar_get_shell_view (
				E_SHELL_SIDEBAR (object)));
			return;
	}

	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
shell_sidebar_dispose (GObject *object)
{
	EShellSidebarPrivate *priv;

	priv = E_SHELL_SIDEBAR_GET_PRIVATE (object);

	if (priv->shell_view != NULL) {
		g_object_remove_weak_pointer (
			G_OBJECT (priv->shell_view), &priv->shell_view);
		priv->shell_view = NULL;
	}

	/* Unparent the widget before destroying it to avoid
	 * writing a custom GtkContainer::remove() method. */

	if (priv->event_box != NULL) {
		gtk_widget_unparent (priv->event_box);
		gtk_widget_destroy (priv->event_box);
		g_object_unref (priv->event_box);
		priv->event_box = NULL;
	}

	/* Chain up to parent's dispose() method. */
	G_OBJECT_CLASS (e_shell_sidebar_parent_class)->dispose (object);
}

static void
shell_sidebar_finalize (GObject *object)
{
	EShellSidebarPrivate *priv;

	priv = E_SHELL_SIDEBAR_GET_PRIVATE (object);

	g_free (priv->icon_name);
	g_free (priv->primary_text);
	g_free (priv->secondary_text);

	/* Chain up to parent's finalize() method. */
	G_OBJECT_CLASS (e_shell_sidebar_parent_class)->finalize (object);
}

static void
shell_sidebar_constructed (GObject *object)
{
	EShellView *shell_view;
	EShellSidebar *shell_sidebar;
	GtkAction *action;
	gchar *label;
	gchar *icon_name;

	shell_sidebar = E_SHELL_SIDEBAR (object);
	shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
	action = e_shell_view_get_action (shell_view);

	g_object_get (action, "icon-name", &icon_name, NULL);
	e_shell_sidebar_set_icon_name (shell_sidebar, icon_name);
	g_free (icon_name);

	g_object_get (action, "label", &label, NULL);
	e_shell_sidebar_set_primary_text (shell_sidebar, label);
	g_free (label);

	e_extensible_load_extensions (E_EXTENSIBLE (object));

	/* Chain up to parent's constructed() method. */
	G_OBJECT_CLASS (e_shell_sidebar_parent_class)->constructed (object);
}

static void
shell_sidebar_get_preferred_width (GtkWidget *widget,
                                   gint *minimum,
                                   gint *natural)
{
	GtkWidget *child;

	child = gtk_bin_get_child (GTK_BIN (widget));
	gtk_widget_get_preferred_width (child, minimum, natural);

	/* Do not use priv->event_box here, otherwise it won't ellipsize. */
}

static void
shell_sidebar_get_preferred_height (GtkWidget *widget,
                                    gint *minimum,
                                    gint *natural)
{
	EShellSidebarPrivate *priv;
	gint child_min, child_nat;
	GtkWidget *child;

	priv = E_SHELL_SIDEBAR_GET_PRIVATE (widget);

	child = gtk_bin_get_child (GTK_BIN (widget));
	gtk_widget_get_preferred_height (child, minimum, natural);

	child = priv->event_box;
	gtk_widget_get_preferred_height (child, &child_min, &child_nat);

	*minimum += child_min;
	*natural += child_nat;
}

static void
shell_sidebar_size_allocate (GtkWidget *widget,
                             GtkAllocation *allocation)
{
	EShellSidebarPrivate *priv;
	GtkAllocation child_allocation;
	GtkRequisition child_requisition;
	GtkWidget *child;

	priv = E_SHELL_SIDEBAR_GET_PRIVATE (widget);

	gtk_widget_set_allocation (widget, allocation);

	child = priv->event_box;
	gtk_widget_get_preferred_size (child, &child_requisition, NULL);

	child_allocation.x = allocation->x;
	child_allocation.y = allocation->y;
	child_allocation.width = allocation->width;
	child_allocation.height = child_requisition.height;

	gtk_widget_size_allocate (child, &child_allocation);

	child_allocation.y += child_requisition.height;
	child_allocation.height =
		allocation->height - child_requisition.height;

	child = gtk_bin_get_child (GTK_BIN (widget));
	if (child != NULL)
		gtk_widget_size_allocate (child, &child_allocation);
}

static void
shell_sidebar_forall (GtkContainer *container,
                      gboolean include_internals,
                      GtkCallback callback,
                      gpointer callback_data)
{
	EShellSidebarPrivate *priv;

	priv = E_SHELL_SIDEBAR_GET_PRIVATE (container);

	if (include_internals && callback && priv->event_box)
		callback (priv->event_box, callback_data);

	/* Chain up to parent's forall() method. */
	GTK_CONTAINER_CLASS (e_shell_sidebar_parent_class)->forall (
		container, include_internals, callback, callback_data);
}

static void
shell_sidebar_submit_alert (EAlertSink *alert_sink,
                            EAlert *alert)
{
	EShellView *shell_view;
	EShellContent *shell_content;
	EShellSidebar *shell_sidebar;

	/* EShellSidebar is a proxy alert sink.  Forward the alert
	 * to the EShellContent widget for display to the user. */

	shell_sidebar = E_SHELL_SIDEBAR (alert_sink);
	shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
	shell_content = e_shell_view_get_shell_content (shell_view);

	alert_sink = E_ALERT_SINK (shell_content);
	e_alert_sink_submit_alert (alert_sink, alert);
}

static void
e_shell_sidebar_class_init (EShellSidebarClass *class)
{
	GObjectClass *object_class;
	GtkWidgetClass *widget_class;
	GtkContainerClass *container_class;

	g_type_class_add_private (class, sizeof (EShellSidebarPrivate));

	object_class = G_OBJECT_CLASS (class);
	object_class->set_property = shell_sidebar_set_property;
	object_class->get_property = shell_sidebar_get_property;
	object_class->dispose = shell_sidebar_dispose;
	object_class->finalize = shell_sidebar_finalize;
	object_class->constructed = shell_sidebar_constructed;

	widget_class = GTK_WIDGET_CLASS (class);
	widget_class->get_preferred_width = shell_sidebar_get_preferred_width;
	widget_class->get_preferred_height = shell_sidebar_get_preferred_height;
	widget_class->size_allocate = shell_sidebar_size_allocate;

	container_class = GTK_CONTAINER_CLASS (class);
	container_class->forall = shell_sidebar_forall;

	/**
	 * EShellSidebar:icon-name
	 *
	 * The named icon is displayed at the top of the sidebar.
	 **/
	g_object_class_install_property (
		object_class,
		PROP_ICON_NAME,
		g_param_spec_string (
			"icon-name",
			"Icon Name",
			NULL,
			NULL,
			G_PARAM_READWRITE));

	/**
	 * EShellSidebar:primary-text
	 *
	 * The primary text is displayed in bold at the top of the sidebar.
	 **/
	g_object_class_install_property (
		object_class,
		PROP_PRIMARY_TEXT,
		g_param_spec_string (
			"primary-text",
			"Primary Text",
			NULL,
			NULL,
			G_PARAM_READWRITE));

	/**
	 * EShellSidebar:secondary-text
	 *
	 * The secondary text is displayed in a smaller font at the top of
	 * the sidebar.
	 **/
	g_object_class_install_property (
		object_class,
		PROP_SECONDARY_TEXT,
		g_param_spec_string (
			"secondary-text",
			"Secondary Text",
			NULL,
			NULL,
			G_PARAM_READWRITE));

	/**
	 * EShellSidebar:shell-view
	 *
	 * The #EShellView to which the sidebar widget belongs.
	 **/
	g_object_class_install_property (
		object_class,
		PROP_SHELL_VIEW,
		g_param_spec_object (
			"shell-view",
			"Shell View",
			NULL,
			E_TYPE_SHELL_VIEW,
			G_PARAM_READWRITE |
			G_PARAM_CONSTRUCT_ONLY));
}

static void
e_shell_sidebar_alert_sink_init (EAlertSinkInterface *interface)
{
	interface->submit_alert = shell_sidebar_submit_alert;
}

static void
e_shell_sidebar_init (EShellSidebar *shell_sidebar)
{
	GtkStyle *style;
	GtkWidget *widget;
	GtkWidget *container;
	PangoAttribute *attribute;
	PangoAttrList *attribute_list;
	const GdkColor *color;
	const gchar *icon_name;

	shell_sidebar->priv = E_SHELL_SIDEBAR_GET_PRIVATE (shell_sidebar);

	gtk_widget_set_has_window (GTK_WIDGET (shell_sidebar), FALSE);

	widget = gtk_event_box_new ();
	style = gtk_widget_get_style (widget);
	color = &style->bg[GTK_STATE_ACTIVE];
	gtk_widget_modify_bg (widget, GTK_STATE_NORMAL, color);
	gtk_widget_set_parent (widget, GTK_WIDGET (shell_sidebar));
	shell_sidebar->priv->event_box = g_object_ref (widget);
	gtk_widget_show (widget);

	container = widget;

	widget = gtk_hbox_new (FALSE, 6);
	gtk_container_set_border_width (GTK_CONTAINER (widget), 6);
	gtk_container_add (GTK_CONTAINER (container), widget);
	gtk_widget_show (widget);

	container = widget;

	/* Pick a bogus icon name just to get the storage type set. */
	icon_name = "evolution";
	e_shell_sidebar_set_icon_name (shell_sidebar, icon_name);
	widget = gtk_image_new_from_icon_name (icon_name, GTK_ICON_SIZE_MENU);
	gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
	gtk_widget_show (widget);

	g_object_bind_property (
		shell_sidebar, "icon-name",
		widget, "icon-name",
		G_BINDING_SYNC_CREATE);

	widget = gtk_label_new (NULL);
	gtk_label_set_ellipsize (GTK_LABEL (widget), PANGO_ELLIPSIZE_END);
	gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
	gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
	gtk_widget_show (widget);

	attribute_list = pango_attr_list_new ();
	attribute = pango_attr_weight_new (PANGO_WEIGHT_BOLD);
	pango_attr_list_insert (attribute_list, attribute);
	gtk_label_set_attributes (GTK_LABEL (widget), attribute_list);
	pango_attr_list_unref (attribute_list);

	g_object_bind_property (
		shell_sidebar, "primary-text",
		widget, "label",
		G_BINDING_SYNC_CREATE);

	widget = gtk_label_new (NULL);
	gtk_misc_set_alignment (GTK_MISC (widget), 1.0, 0.5);
	gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
	gtk_widget_show (widget);

	attribute_list = pango_attr_list_new ();
	attribute = pango_attr_scale_new (PANGO_SCALE_SMALL);
	pango_attr_list_insert (attribute_list, attribute);
	gtk_label_set_attributes (GTK_LABEL (widget), attribute_list);
	pango_attr_list_unref (attribute_list);

	g_object_bind_property (
		shell_sidebar, "secondary-text",
		widget, "label",
		G_BINDING_SYNC_CREATE);
}

/**
 * e_shell_sidebar_new:
 * @shell_view: an #EShellView
 *
 * Creates a new #EShellSidebar instance belonging to @shell_view.
 *
 * Returns: a new #EShellSidebar instance
 **/
GtkWidget *
e_shell_sidebar_new (EShellView *shell_view)
{
	g_return_val_if_fail (E_IS_SHELL_VIEW (shell_view), NULL);

	return g_object_new (
		E_TYPE_SHELL_SIDEBAR,
		"shell-view", shell_view, NULL);
}

/**
 * e_shell_sidebar_check_state:
 * @shell_sidebar: an #EShellSidebar
 *
 * #EShellSidebar subclasses should implement the
 * <structfield>check_state</structfield> method in #EShellSidebarClass
 * to return a set of flags describing the current sidebar selection.
 * Subclasses are responsible for defining their own flags.  This is
 * primarily used to assist shell views with updating actions (see
 * e_shell_view_update_actions()).
 *
 * Returns: a set of flags describing the current @shell_sidebar selection
 **/
guint32
e_shell_sidebar_check_state (EShellSidebar *shell_sidebar)
{
	EShellSidebarClass *shell_sidebar_class;

	g_return_val_if_fail (E_IS_SHELL_SIDEBAR (shell_sidebar), 0);

	shell_sidebar_class = E_SHELL_SIDEBAR_GET_CLASS (shell_sidebar);
	g_return_val_if_fail (shell_sidebar_class->check_state != NULL, 0);

	return shell_sidebar_class->check_state (shell_sidebar);
}

/**
 * e_shell_sidebar_get_shell_view:
 * @shell_sidebar: an #EShellSidebar
 *
 * Returns the #EShellView that was passed to e_shell_sidebar_new().
 *
 * Returns: the #EShellView to which @shell_sidebar belongs
 **/
EShellView *
e_shell_sidebar_get_shell_view (EShellSidebar *shell_sidebar)
{
	g_return_val_if_fail (E_IS_SHELL_SIDEBAR (shell_sidebar), NULL);

	return E_SHELL_VIEW (shell_sidebar->priv->shell_view);
}

/**
 * e_shell_sidebar_get_icon_name:
 * @shell_sidebar: an #EShellSidebar
 *
 * Returns the icon name displayed at the top of the sidebar.
 *
 * Returns: the icon name for @shell_sidebar
 **/
const gchar *
e_shell_sidebar_get_icon_name (EShellSidebar *shell_sidebar)
{
	g_return_val_if_fail (E_IS_SHELL_SIDEBAR (shell_sidebar), NULL);

	return shell_sidebar->priv->icon_name;
}

/**
 * e_shell_sidebar_set_icon_name:
 * @shell_sidebar: an #EShellSidebar
 * @icon_name: a themed icon name
 *
 * Sets the icon name displayed at the top of the sidebar.
 **/
void
e_shell_sidebar_set_icon_name (EShellSidebar *shell_sidebar,
                               const gchar *icon_name)
{
	g_return_if_fail (E_IS_SHELL_SIDEBAR (shell_sidebar));

	if (g_strcmp0 (shell_sidebar->priv->icon_name, icon_name) == 0)
		return;

	g_free (shell_sidebar->priv->icon_name);
	shell_sidebar->priv->icon_name = g_strdup (icon_name);

	g_object_notify (G_OBJECT (shell_sidebar), "icon-name");
}

/**
 * e_shell_sidebar_get_primary_text:
 * @shell_sidebar: an #EShellSidebar
 *
 * Returns the primary text for @shell_sidebar.
 *
 * The primary text is displayed in bold at the top of the sidebar.  It
 * defaults to the shell view's label (as seen on the switcher button),
 * but typically shows the name of the selected item in the sidebar.
 *
 * Returns: the primary text for @shell_sidebar
 **/
const gchar *
e_shell_sidebar_get_primary_text (EShellSidebar *shell_sidebar)
{
	g_return_val_if_fail (E_IS_SHELL_SIDEBAR (shell_sidebar), NULL);

	return shell_sidebar->priv->primary_text;
}

/**
 * e_shell_sidebar_set_primary_text:
 * @shell_sidebar: an #EShellSidebar
 * @primary_text: text to be displayed in a bold font
 *
 * Sets the primary text for @shell_sidebar.
 *
 * The primary text is displayed in bold at the top of the sidebar.  It
 * defaults to the shell view's label (as seen on the switcher button),
 * but typically shows the name of the selected item in the sidebar.
 **/
void
e_shell_sidebar_set_primary_text (EShellSidebar *shell_sidebar,
                                  const gchar *primary_text)
{
	g_return_if_fail (E_IS_SHELL_SIDEBAR (shell_sidebar));

	if (g_strcmp0 (shell_sidebar->priv->primary_text, primary_text) == 0)
		return;

	g_free (shell_sidebar->priv->primary_text);
	shell_sidebar->priv->primary_text = e_utf8_ensure_valid (primary_text);

	gtk_widget_queue_resize (GTK_WIDGET (shell_sidebar));
	g_object_notify (G_OBJECT (shell_sidebar), "primary-text");
}

/**
 * e_shell_sidebar_get_secondary_text:
 * @shell_sidebar: an #EShellSidebar
 *
 * Returns the secondary text for @shell_sidebar.
 *
 * The secondary text is displayed in a smaller font at the top of the
 * sidebar.  It typically shows information about the contents of the
 * selected sidebar item, such as total number of items, number of
 * selected items, etc.
 *
 * Returns: the secondary text for @shell_sidebar
 **/
const gchar *
e_shell_sidebar_get_secondary_text (EShellSidebar *shell_sidebar)
{
	g_return_val_if_fail (E_IS_SHELL_SIDEBAR (shell_sidebar), NULL);

	return shell_sidebar->priv->secondary_text;
}

/**
 * e_shell_sidebar_set_secondary_text:
 * @shell_sidebar: an #EShellSidebar
 * @secondary_text: text to be displayed in a smaller font
 *
 * Sets the secondary text for @shell_sidebar.
 *
 * The secondary text is displayed in a smaller font at the top of the
 * sidebar.  It typically shows information about the contents of the
 * selected sidebar item, such as total number of items, number of
 * selected items, etc.
 **/
void
e_shell_sidebar_set_secondary_text (EShellSidebar *shell_sidebar,
                                    const gchar *secondary_text)
{
	g_return_if_fail (E_IS_SHELL_SIDEBAR (shell_sidebar));

	if (g_strcmp0 (shell_sidebar->priv->secondary_text, secondary_text) == 0)
		return;

	g_free (shell_sidebar->priv->secondary_text);
	shell_sidebar->priv->secondary_text = e_utf8_ensure_valid (secondary_text);

	gtk_widget_queue_resize (GTK_WIDGET (shell_sidebar));
	g_object_notify (G_OBJECT (shell_sidebar), "secondary-text");
}