/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Copyright © 2001 Matthew Mueller
 *  Copyright © 2002 Jorn Baayen <jorn@nl.linux.org>
 *  Copyright © 2003 Marco Pesenti Gritti <mpeseng@tin.it>
 *
 *  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, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 *  $Id$
 */

#include "config.h"

#include "ephy-state.h"
#include "ephy-lib-type-builtins.h"
#include "ephy-file-helpers.h"
#include "ephy-node-db.h"
#include "ephy-node-common.h"

#include <string.h>
#include <gtk/gtkwindow.h>
#include <gtk/gtkpaned.h>
#include <gtk/gtkexpander.h>
#include <gtk/gtktogglebutton.h>

#define EPHY_STATES_XML_FILE	"states.xml"
#define EPHY_STATES_XML_ROOT    (const xmlChar *)"ephy_states"
#define EPHY_STATES_XML_VERSION (const xmlChar *)"1.0"

enum
{
	EPHY_NODE_STATE_PROP_NAME = 2,
	EPHY_NODE_STATE_PROP_WIDTH = 3,
	EPHY_NODE_STATE_PROP_HEIGHT = 4,
	EPHY_NODE_STATE_PROP_MAXIMIZE = 5,
	EPHY_NODE_STATE_PROP_POSITION_X = 6,
	EPHY_NODE_STATE_PROP_POSITION_Y = 7,
	EPHY_NODE_STATE_PROP_SIZE = 8,
	EPHY_NODE_STATE_PROP_POSITION = 9,
	EPHY_NODE_STATE_PROP_ACTIVE = 10
};

static EphyNode *states = NULL;
static EphyNodeDb *states_db = NULL;

static void
ephy_states_save (void)
{
	char *xml_file;

	xml_file = g_build_filename (ephy_dot_dir (),
				     EPHY_STATES_XML_FILE,
                                     NULL);

	ephy_node_db_write_to_xml_safe
		(states_db, 
		 (const xmlChar *)xml_file,
		 EPHY_STATES_XML_ROOT,
		 EPHY_STATES_XML_VERSION,
		 NULL, /* comment */
		 states, NULL, NULL,
		 NULL);

	g_free (xml_file);	
}

static EphyNode *
find_by_name (const char *name)
{
	EphyNode *result = NULL;
	GPtrArray *children;
	int i;

	children = ephy_node_get_children (states);
	for (i = 0; i < children->len; i++)
	{
		EphyNode *kid;
		const char *node_name;

		kid = g_ptr_array_index (children, i);

		node_name = ephy_node_get_property_string
			(kid, EPHY_NODE_STATE_PROP_NAME);
		if (strcmp (node_name, name) == 0)
		{
			result = kid;
		}
	}

	return result;
}

static void
ensure_states (void)
{
	if (states == NULL)
	{
		volatile GType flags_type; /* work around gcc's optimiser */
		char *xml_file;

		/* make sure the type is known when we read the db */
		flags_type = EPHY_TYPE_STATE_WINDOW_FLAGS;

		xml_file = g_build_filename (ephy_dot_dir (),
					     EPHY_STATES_XML_FILE,
					     NULL);

		states_db = ephy_node_db_new (EPHY_NODE_DB_STATES);
		states = ephy_node_new_with_id (states_db, STATES_NODE_ID);
		ephy_node_db_load_from_file (states_db, xml_file,
					     EPHY_STATES_XML_ROOT,
					     EPHY_STATES_XML_VERSION);
	
		g_free (xml_file);
	}
}

static void
ephy_state_window_set_size (GtkWidget *window, EphyNode *node)
{
	int width, height, w = -1, h = -1;
	gboolean maximize, size;

	width = ephy_node_get_property_int (node, EPHY_NODE_STATE_PROP_WIDTH);
	height = ephy_node_get_property_int (node, EPHY_NODE_STATE_PROP_HEIGHT);
	maximize = ephy_node_get_property_boolean (node, EPHY_NODE_STATE_PROP_MAXIMIZE);
	size = ephy_node_get_property_boolean (node, EPHY_NODE_STATE_PROP_SIZE);

	gtk_window_get_default_size (GTK_WINDOW (window), &w, &h);
	if (size && w == -1 && h == -1)
	{
		GdkScreen *screen;
		int screen_width, screen_height;

		screen = gdk_screen_get_default ();
		screen_width = gdk_screen_get_width (screen);
		screen_height = gdk_screen_get_height (screen);

		gtk_window_set_default_size (GTK_WINDOW (window),
					     MIN (width, screen_width),
					     MIN (height, screen_height));
	}

	if (maximize)
	{
		gtk_window_maximize (GTK_WINDOW (window));
	}
}

static void
ephy_state_window_set_position (GtkWidget *window, EphyNode *node)
{
	GdkScreen *screen;
	int x, y;
	int screen_width, screen_height;
	gboolean maximize, size;

	g_return_if_fail (GTK_IS_WINDOW (window));

	/* Setting the default size doesn't work when the window is already showing. */
	g_return_if_fail (!GTK_WIDGET_VISIBLE (window));

	maximize = ephy_node_get_property_boolean (node, EPHY_NODE_STATE_PROP_MAXIMIZE);
	size = ephy_node_get_property_boolean (node, EPHY_NODE_STATE_PROP_POSITION);

	/* Don't set the position of the window if it is maximized */
	if ((!maximize) && size)
	{
		x = ephy_node_get_property_int (node, EPHY_NODE_STATE_PROP_POSITION_X);
		y = ephy_node_get_property_int (node, EPHY_NODE_STATE_PROP_POSITION_Y);

		screen = gtk_window_get_screen (GTK_WINDOW (window));
		screen_width  = gdk_screen_get_width  (screen);
		screen_height = gdk_screen_get_height (screen);

		if ((x <= screen_width) && (y <= screen_height) &&
		    (x >= 0) && (y >= 0))
		{
			gtk_window_move (GTK_WINDOW (window), x, y);
		}
	}
}

static void
ephy_state_save_unmaximized_size (EphyNode *node, int width, int height)
{
	ephy_node_set_property_int (node, EPHY_NODE_STATE_PROP_WIDTH,
				    width);
	ephy_node_set_property_int (node, EPHY_NODE_STATE_PROP_HEIGHT,
				    height);
	ephy_node_set_property_boolean (node, EPHY_NODE_STATE_PROP_SIZE,
					TRUE);
}

static void
ephy_state_save_position (EphyNode *node, int x, int y)
{
	ephy_node_set_property_int (node, EPHY_NODE_STATE_PROP_POSITION_X,
				    x);
	ephy_node_set_property_int (node, EPHY_NODE_STATE_PROP_POSITION_Y,
				    y);
	ephy_node_set_property_boolean (node, EPHY_NODE_STATE_PROP_POSITION,
					TRUE);
}


static void
ephy_state_window_save_size (GtkWidget *window, EphyNode *node)
{
	int width, height;
	gboolean maximize;
	GdkWindowState state;

	state = gdk_window_get_state (GTK_WIDGET (window)->window);
	maximize = ((state & GDK_WINDOW_STATE_MAXIMIZED) > 0);

	gtk_window_get_size (GTK_WINDOW(window),
			     &width, &height);

	if (!maximize)
	{
		ephy_state_save_unmaximized_size (node, width, height);
	}
	
	ephy_node_set_property_boolean (node,
					EPHY_NODE_STATE_PROP_MAXIMIZE,
					maximize);
}

static void
ephy_state_window_save_position (GtkWidget *window, EphyNode *node)
{
	int x,y;
	gboolean maximize;
	GdkWindowState state;

	state = gdk_window_get_state (GTK_WIDGET (window)->window);
	maximize = ((state & GDK_WINDOW_STATE_MAXIMIZED) > 0);

	/* Don't save the position if maximized */
	if (!maximize)
	{
		gtk_window_get_position (GTK_WINDOW (window), &x, &y);
		ephy_state_save_position (node, x, y);
	}
}

static void
ephy_state_window_save (GtkWidget *widget, EphyNode *node)
{
	EphyStateWindowFlags flags;

	flags = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (widget), "state_flags"));

	if (flags & EPHY_STATE_WINDOW_SAVE_SIZE)
	{
		ephy_state_window_save_size (widget, node);
	}

	if (flags & EPHY_STATE_WINDOW_SAVE_POSITION)
	{
		ephy_state_window_save_position (widget, node);
	}
}

static gboolean
window_configure_event_cb (GtkWidget *widget,
			   GdkEventConfigure *event,
			   EphyNode *node)
{
	GdkWindowState state;

	state = gdk_window_get_state (widget->window);

	if (!(state & GDK_WINDOW_STATE_FULLSCREEN))
	{
		ephy_state_window_save (widget, node);
	}

	return FALSE;
}

static gboolean
window_state_event_cb (GtkWidget *widget,
		       GdkEventWindowState *event,
		       EphyNode *node)
{
	if (!(event->new_window_state & GDK_WINDOW_STATE_FULLSCREEN))
	{
		ephy_state_window_save (widget, node);
	}

	return FALSE;
}

static EphyNode *
create_window_node (const char *name,
		    int default_width,
		    int default_height,
		    gboolean maximize,
		    EphyStateWindowFlags flags)
{
	EphyNode *node;

	node = ephy_node_new (states_db);
	ephy_node_add_child (states, node);

	ephy_node_set_property_string (node, EPHY_NODE_STATE_PROP_NAME,
				       name);
	ephy_node_set_property_boolean (node, EPHY_NODE_STATE_PROP_MAXIMIZE,
					maximize);

	if (flags & EPHY_STATE_WINDOW_SAVE_SIZE)
	{
		ephy_state_save_unmaximized_size (node,
						 default_width,
						 default_height);
	}

        if (flags & EPHY_STATE_WINDOW_SAVE_POSITION)
        {
		/* Constants for now, these should be default_width
		   and default_height. */
		ephy_state_save_position (node, 0, 0);
        }

	return node;
}

void
ephy_state_add_window (GtkWidget *window,
		       const char *name,
		       int default_width,
		       int default_height,
		       gboolean maximize,
		       EphyStateWindowFlags flags)
{
	EphyNode *node;

	ensure_states ();

	node = find_by_name (name);
	if (node == NULL)
	{
		node = create_window_node (name, default_width, default_height,
					   maximize, flags);
	}

	ephy_state_window_set_size (window, node);
	ephy_state_window_set_position (window, node);

	g_object_set_data (G_OBJECT (window), "state_flags", GINT_TO_POINTER (flags));

	g_signal_connect (window, "configure_event",
			  G_CALLBACK (window_configure_event_cb), node);
	g_signal_connect (window, "window_state_event",
			  G_CALLBACK (window_state_event_cb), node);
}

static gboolean
paned_sync_position_cb (GtkWidget *paned,
			GParamSpec *pspec,
			EphyNode *node)
{
	int width;

	width = gtk_paned_get_position (GTK_PANED (paned));
	ephy_node_set_property_int (node, EPHY_NODE_STATE_PROP_WIDTH,
				    width);
	return FALSE;
}

void
ephy_state_add_paned (GtkWidget *paned,
		      const char *name,
		      int default_width)
{
	EphyNode *node;
	int width;

	ensure_states ();

	node = find_by_name (name);
	if (node == NULL)
	{
		node = ephy_node_new (states_db);
		ephy_node_add_child (states, node);

		ephy_node_set_property_string (node,
					       EPHY_NODE_STATE_PROP_NAME,
					       name);
		ephy_node_set_property_int (node,
					    EPHY_NODE_STATE_PROP_WIDTH,
					    default_width);
	}

	width = ephy_node_get_property_int (node, EPHY_NODE_STATE_PROP_WIDTH);
	gtk_paned_set_position (GTK_PANED (paned), width);

	g_signal_connect (paned, "notify::position",
			  G_CALLBACK (paned_sync_position_cb), node);
}

static void
sync_expander_cb (GtkExpander *expander,
		  GParamSpec *pspec,
		  EphyNode *node)
{
	gboolean is_expanded;

	is_expanded = gtk_expander_get_expanded (expander);
	ephy_node_set_property_boolean (node,
					EPHY_NODE_STATE_PROP_ACTIVE,
					is_expanded);
}

static void
sync_toggle_cb (GtkToggleButton *toggle,
		GParamSpec *pspec,
		EphyNode *node)
{
	gboolean is_active;

	is_active = gtk_toggle_button_get_active (toggle);
	ephy_node_set_property_boolean (node,
					EPHY_NODE_STATE_PROP_ACTIVE,
					is_active);
}

void 
ephy_state_add_expander (GtkWidget *widget,
			 const char *name,
			 gboolean default_state)
{
	EphyNode *node;
	gboolean active;

	ensure_states ();

	node = find_by_name (name);
	if (node == NULL)
	{
		node = ephy_node_new (states_db);
		ephy_node_add_child (states, node);

		ephy_node_set_property_string (node,
					       EPHY_NODE_STATE_PROP_NAME,
					       name);
		ephy_node_set_property_boolean (node,
						EPHY_NODE_STATE_PROP_ACTIVE,
						default_state);
	}

	active = ephy_node_get_property_boolean
		(node, EPHY_NODE_STATE_PROP_ACTIVE);

	if (GTK_IS_TOGGLE_BUTTON (widget))
	{
		gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (widget), active);
		g_signal_connect (widget, "notify::active",
				  G_CALLBACK (sync_toggle_cb), node);
	}
	else if (GTK_IS_EXPANDER (widget))
	{
		gtk_expander_set_expanded (GTK_EXPANDER (widget), active);
		g_signal_connect (widget, "notify::expanded",
				  G_CALLBACK (sync_expander_cb), node);
	}
}

void
ephy_state_save (void)
{
	if (states)
	{
		ephy_states_save ();
		ephy_node_unref (states);
		g_object_unref (states_db);
		states = NULL;
		states_db = NULL;
	}
}